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treewide: use prandom_u32_max() when possible, part 1

Browse Source 
Rather than incurring a division or requesting too many random bytes for
the given range, use the prandom_u32_max() function, which only takes
the minimum required bytes from the RNG and avoids divisions. This was
done mechanically with this coccinelle script:

@basic@
expression E;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u64;
@@
(
- ((T)get_random_u32() % (E))
+ prandom_u32_max(E)
|
- ((T)get_random_u32() & ((E) - 1))
+ prandom_u32_max(E * XXX_MAKE_SURE_E_IS_POW2)
|
- ((u64)(E) * get_random_u32() >> 32)
+ prandom_u32_max(E)
|
- ((T)get_random_u32() & ~PAGE_MASK)
+ prandom_u32_max(PAGE_SIZE)
)

@multi_line@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
identifier RAND;
expression E;
@@

-       RAND = get_random_u32();
        ... when != RAND
-       RAND %= (E);
+       RAND = prandom_u32_max(E);

// Find a potential literal
@literal_mask@
expression LITERAL;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
position p;
@@

        ((T)get_random_u32()@p & (LITERAL))

// Add one to the literal.
@script:python add_one@
literal << literal_mask.LITERAL;
RESULT;
@@

value = None
if literal.startswith('0x'):
        value = int(literal, 16)
elif literal[0] in '123456789':
        value = int(literal, 10)
if value is None:
        print("I don't know how to handle %s" % (literal))
        cocci.include_match(False)
elif value == 2**32 - 1 or value == 2**31 - 1 or value == 2**24 - 1 or value == 2**16 - 1 or value == 2**8 - 1:
        print("Skipping 0x%x for cleanup elsewhere" % (value))
        cocci.include_match(False)
elif value & (value + 1) != 0:
        print("Skipping 0x%x because it's not a power of two minus one" % (value))
        cocci.include_match(False)
elif literal.startswith('0x'):
        coccinelle.RESULT = cocci.make_expr("0x%x" % (value + 1))
else:
        coccinelle.RESULT = cocci.make_expr("%d" % (value + 1))

// Replace the literal mask with the calculated result.
@plus_one@
expression literal_mask.LITERAL;
position literal_mask.p;
expression add_one.RESULT;
identifier FUNC;
@@

-       (FUNC()@p & (LITERAL))
+       prandom_u32_max(RESULT)

@collapse_ret@
type T;
identifier VAR;
expression E;
@@

 {
-       T VAR;
-       VAR = (E);
-       return VAR;
+       return E;
 }

@drop_var@
type T;
identifier VAR;
@@

 {
-       T VAR;
        ... when != VAR
 }

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Yury Norov <yury.norov@gmail.com>
Reviewed-by: KP Singh <kpsingh@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 and sbitmap
Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> # for drbd
Acked-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390
Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc
Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2022-10-05 16:43:38 +02:00
parent d465bff130
commit 81895a65ec
89 changed files with 204 additions and 218 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/kernel/process.c
View File

@ -375,7 +375,7 @@ static unsigned long sigpage_addr(const struct mm_struct *mm,
slots = ((last - first) >> PAGE_SHIFT) + 1;
offset = get_random_int() % slots;
offset = prandom_u32_max(slots);
addr = first + (offset << PAGE_SHIFT);

2
arch/arm64/kernel/process.c
View File

@ -595,7 +595,7 @@ unsigned long __get_wchan(struct task_struct *p)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() & ~PAGE_MASK;
sp -= prandom_u32_max(PAGE_SIZE);
return sp & ~0xf;
}

2
arch/loongarch/kernel/process.c
View File

@ -293,7 +293,7 @@ unsigned long stack_top(void)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() & ~PAGE_MASK;
sp -= prandom_u32_max(PAGE_SIZE);
return sp & STACK_ALIGN;
}

2
arch/loongarch/kernel/vdso.c
View File

@ -78,7 +78,7 @@ static unsigned long vdso_base(void)
unsigned long base = STACK_TOP;
if (current->flags & PF_RANDOMIZE) {
base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);
base += prandom_u32_max(VDSO_RANDOMIZE_SIZE);
base = PAGE_ALIGN(base);
}

2
arch/mips/kernel/process.c
View File

@ -711,7 +711,7 @@ unsigned long mips_stack_top(void)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() & ~PAGE_MASK;
sp -= prandom_u32_max(PAGE_SIZE);
return sp & ALMASK;
}

2
arch/mips/kernel/vdso.c
View File

@ -79,7 +79,7 @@ static unsigned long vdso_base(void)
}
if (current->flags & PF_RANDOMIZE) {
base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);
base += prandom_u32_max(VDSO_RANDOMIZE_SIZE);
base = PAGE_ALIGN(base);
}

2
arch/parisc/kernel/vdso.c
View File

@ -75,7 +75,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
map_base = mm->mmap_base;
if (current->flags & PF_RANDOMIZE)
map_base -= (get_random_int() & 0x1f) * PAGE_SIZE;
map_base -= prandom_u32_max(0x20) * PAGE_SIZE;
vdso_text_start = get_unmapped_area(NULL, map_base, vdso_text_len, 0, 0);

2
arch/powerpc/kernel/process.c
View File

@ -2308,6 +2308,6 @@ void notrace __ppc64_runlatch_off(void)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() & ~PAGE_MASK;
sp -= prandom_u32_max(PAGE_SIZE);
return sp & ~0xf;
}

2
arch/s390/kernel/process.c
View File

@ -224,7 +224,7 @@ unsigned long __get_wchan(struct task_struct *p)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() & ~PAGE_MASK;
sp -= prandom_u32_max(PAGE_SIZE);
return sp & ~0xf;
}

2
arch/s390/kernel/vdso.c
View File

@ -227,7 +227,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned long len)
end -= len;
if (end > start) {
offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
offset = prandom_u32_max(((end - start) >> PAGE_SHIFT) + 1);
addr = start + (offset << PAGE_SHIFT);
} else {
addr = start;

2
arch/sparc/vdso/vma.c
View File

@ -354,7 +354,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned int len)
unsigned int offset;
/* This loses some more bits than a modulo, but is cheaper */
offset = get_random_int() & (PTRS_PER_PTE - 1);
offset = prandom_u32_max(PTRS_PER_PTE);
return start + (offset << PAGE_SHIFT);
}

2
arch/um/kernel/process.c
View File

@ -356,7 +356,7 @@ int singlestepping(void * t)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() % 8192;
sp -= prandom_u32_max(8192);
return sp & ~0xf;
}
#endif

2
arch/x86/entry/vdso/vma.c
View File

@ -327,7 +327,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned len)
end -= len;
if (end > start) {
offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
offset = prandom_u32_max(((end - start) >> PAGE_SHIFT) + 1);
addr = start + (offset << PAGE_SHIFT);
} else {
addr = start;

2
arch/x86/kernel/module.c
View File

@ -53,7 +53,7 @@ static unsigned long int get_module_load_offset(void)
*/
if (module_load_offset == 0)
module_load_offset =
(get_random_int() % 1024 + 1) * PAGE_SIZE;
(prandom_u32_max(1024) + 1) * PAGE_SIZE;
mutex_unlock(&module_kaslr_mutex);
}
return module_load_offset;

2
arch/x86/kernel/process.c
View File

@ -965,7 +965,7 @@ early_param("idle", idle_setup);
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() % 8192;
sp -= prandom_u32_max(8192);
return sp & ~0xf;
}

4
arch/x86/mm/pat/cpa-test.c
View File

@ -136,10 +136,10 @@ static int pageattr_test(void)
failed += print_split(&sa);
for (i = 0; i < NTEST; i++) {
unsigned long pfn = prandom_u32() % max_pfn_mapped;
unsigned long pfn = prandom_u32_max(max_pfn_mapped);
addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT);
len[i] = prandom_u32() % NPAGES;
len[i] = prandom_u32_max(NPAGES);
len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1);
if (len[i] == 0)

86
crypto/testmgr.c
View File

@ -855,9 +855,9 @@ static int prepare_keybuf(const u8 *key, unsigned int ksize,
/* Generate a random length in range [0, max_len], but prefer smaller values */
static unsigned int generate_random_length(unsigned int max_len)
{
unsigned int len = prandom_u32() % (max_len + 1);
unsigned int len = prandom_u32_max(max_len + 1);
switch (prandom_u32() % 4) {
switch (prandom_u32_max(4)) {
case 0:
return len % 64;
case 1:
@ -874,14 +874,14 @@ static void flip_random_bit(u8 *buf, size_t size)
{
size_t bitpos;
bitpos = prandom_u32() % (size * 8);
bitpos = prandom_u32_max(size * 8);
buf[bitpos / 8] ^= 1 << (bitpos % 8);
}
/* Flip a random byte in the given nonempty data buffer */
static void flip_random_byte(u8 *buf, size_t size)
{
buf[prandom_u32() % size] ^= 0xff;
buf[prandom_u32_max(size)] ^= 0xff;
}
/* Sometimes make some random changes to the given nonempty data buffer */
@ -891,15 +891,15 @@ static void mutate_buffer(u8 *buf, size_t size)
size_t i;
/* Sometimes flip some bits */
if (prandom_u32() % 4 == 0) {
num_flips = min_t(size_t, 1 << (prandom_u32() % 8), size * 8);
if (prandom_u32_max(4) == 0) {
num_flips = min_t(size_t, 1 << prandom_u32_max(8), size * 8);
for (i = 0; i < num_flips; i++)
flip_random_bit(buf, size);
}
/* Sometimes flip some bytes */
if (prandom_u32() % 4 == 0) {
num_flips = min_t(size_t, 1 << (prandom_u32() % 8), size);
if (prandom_u32_max(4) == 0) {
num_flips = min_t(size_t, 1 << prandom_u32_max(8), size);
for (i = 0; i < num_flips; i++)
flip_random_byte(buf, size);
}
@ -915,11 +915,11 @@ static void generate_random_bytes(u8 *buf, size_t count)
if (count == 0)
return;
switch (prandom_u32() % 8) { /* Choose a generation strategy */
switch (prandom_u32_max(8)) { /* Choose a generation strategy */
case 0:
case 1:
/* All the same byte, plus optional mutations */
switch (prandom_u32() % 4) {
switch (prandom_u32_max(4)) {
case 0:
b = 0x00;
break;
@ -959,24 +959,24 @@ static char *generate_random_sgl_divisions(struct test_sg_division *divs,
unsigned int this_len;
const char *flushtype_str;
if (div == &divs[max_divs - 1] || prandom_u32() % 2 == 0)
if (div == &divs[max_divs - 1] || prandom_u32_max(2) == 0)
this_len = remaining;
else
this_len = 1 + (prandom_u32() % remaining);
this_len = 1 + prandom_u32_max(remaining);
div->proportion_of_total = this_len;
if (prandom_u32() % 4 == 0)
div->offset = (PAGE_SIZE - 128) + (prandom_u32() % 128);
else if (prandom_u32() % 2 == 0)
div->offset = prandom_u32() % 32;
if (prandom_u32_max(4) == 0)
div->offset = (PAGE_SIZE - 128) + prandom_u32_max(128);
else if (prandom_u32_max(2) == 0)
div->offset = prandom_u32_max(32);
else
div->offset = prandom_u32() % PAGE_SIZE;
if (prandom_u32() % 8 == 0)
div->offset = prandom_u32_max(PAGE_SIZE);
if (prandom_u32_max(8) == 0)
div->offset_relative_to_alignmask = true;
div->flush_type = FLUSH_TYPE_NONE;
if (gen_flushes) {
switch (prandom_u32() % 4) {
switch (prandom_u32_max(4)) {
case 0:
div->flush_type = FLUSH_TYPE_REIMPORT;
break;
@ -988,7 +988,7 @@ static char *generate_random_sgl_divisions(struct test_sg_division *divs,
if (div->flush_type != FLUSH_TYPE_NONE &&
!(req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
prandom_u32() % 2 == 0)
prandom_u32_max(2) == 0)
div->nosimd = true;
switch (div->flush_type) {
@ -1035,7 +1035,7 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
p += scnprintf(p, end - p, "random:");
switch (prandom_u32() % 4) {
switch (prandom_u32_max(4)) {
case 0:
case 1:
cfg->inplace_mode = OUT_OF_PLACE;
@ -1050,12 +1050,12 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
break;
}
if (prandom_u32() % 2 == 0) {
if (prandom_u32_max(2) == 0) {
cfg->req_flags |= CRYPTO_TFM_REQ_MAY_SLEEP;
p += scnprintf(p, end - p, " may_sleep");
}
switch (prandom_u32() % 4) {
switch (prandom_u32_max(4)) {
case 0:
cfg->finalization_type = FINALIZATION_TYPE_FINAL;
p += scnprintf(p, end - p, " use_final");
@ -1071,7 +1071,7 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
}
if (!(cfg->req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
prandom_u32() % 2 == 0) {
prandom_u32_max(2) == 0) {
cfg->nosimd = true;
p += scnprintf(p, end - p, " nosimd");
}
@ -1084,7 +1084,7 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
cfg->req_flags);
p += scnprintf(p, end - p, "]");
if (cfg->inplace_mode == OUT_OF_PLACE && prandom_u32() % 2 == 0) {
if (cfg->inplace_mode == OUT_OF_PLACE && prandom_u32_max(2) == 0) {
p += scnprintf(p, end - p, " dst_divs=[");
p = generate_random_sgl_divisions(cfg->dst_divs,
ARRAY_SIZE(cfg->dst_divs),
@ -1093,13 +1093,13 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
p += scnprintf(p, end - p, "]");
}
if (prandom_u32() % 2 == 0) {
cfg->iv_offset = 1 + (prandom_u32() % MAX_ALGAPI_ALIGNMASK);
if (prandom_u32_max(2) == 0) {
cfg->iv_offset = 1 + prandom_u32_max(MAX_ALGAPI_ALIGNMASK);
p += scnprintf(p, end - p, " iv_offset=%u", cfg->iv_offset);
}
if (prandom_u32() % 2 == 0) {
cfg->key_offset = 1 + (prandom_u32() % MAX_ALGAPI_ALIGNMASK);
if (prandom_u32_max(2) == 0) {
cfg->key_offset = 1 + prandom_u32_max(MAX_ALGAPI_ALIGNMASK);
p += scnprintf(p, end - p, " key_offset=%u", cfg->key_offset);
}
@ -1652,8 +1652,8 @@ static void generate_random_hash_testvec(struct shash_desc *desc,
vec->ksize = 0;
if (maxkeysize) {
vec->ksize = maxkeysize;
if (prandom_u32() % 4 == 0)
vec->ksize = 1 + (prandom_u32() % maxkeysize);
if (prandom_u32_max(4) == 0)
vec->ksize = 1 + prandom_u32_max(maxkeysize);
generate_random_bytes((u8 *)vec->key, vec->ksize);
vec->setkey_error = crypto_shash_setkey(desc->tfm, vec->key,
@ -2218,13 +2218,13 @@ static void mutate_aead_message(struct aead_testvec *vec, bool aad_iv,
const unsigned int aad_tail_size = aad_iv ? ivsize : 0;
const unsigned int authsize = vec->clen - vec->plen;
if (prandom_u32() % 2 == 0 && vec->alen > aad_tail_size) {
if (prandom_u32_max(2) == 0 && vec->alen > aad_tail_size) {
/* Mutate the AAD */
flip_random_bit((u8 *)vec->assoc, vec->alen - aad_tail_size);
if (prandom_u32() % 2 == 0)
if (prandom_u32_max(2) == 0)
return;
}
if (prandom_u32() % 2 == 0) {
if (prandom_u32_max(2) == 0) {
/* Mutate auth tag (assuming it's at the end of ciphertext) */
flip_random_bit((u8 *)vec->ctext + vec->plen, authsize);
} else {
@ -2249,7 +2249,7 @@ static void generate_aead_message(struct aead_request *req,
const unsigned int ivsize = crypto_aead_ivsize(tfm);
const unsigned int authsize = vec->clen - vec->plen;
const bool inauthentic = (authsize >= MIN_COLLISION_FREE_AUTHSIZE) &&
(prefer_inauthentic || prandom_u32() % 4 == 0);
(prefer_inauthentic || prandom_u32_max(4) == 0);
/* Generate the AAD. */
generate_random_bytes((u8 *)vec->assoc, vec->alen);
@ -2257,7 +2257,7 @@ static void generate_aead_message(struct aead_request *req,
/* Avoid implementation-defined behavior. */
memcpy((u8 *)vec->assoc + vec->alen - ivsize, vec->iv, ivsize);
if (inauthentic && prandom_u32() % 2 == 0) {
if (inauthentic && prandom_u32_max(2) == 0) {
/* Generate a random ciphertext. */
generate_random_bytes((u8 *)vec->ctext, vec->clen);
} else {
@ -2321,8 +2321,8 @@ static void generate_random_aead_testvec(struct aead_request *req,
/* Key: length in [0, maxkeysize], but usually choose maxkeysize */
vec->klen = maxkeysize;
if (prandom_u32() % 4 == 0)
vec->klen = prandom_u32() % (maxkeysize + 1);
if (prandom_u32_max(4) == 0)
vec->klen = prandom_u32_max(maxkeysize + 1);
generate_random_bytes((u8 *)vec->key, vec->klen);
vec->setkey_error = crypto_aead_setkey(tfm, vec->key, vec->klen);
@ -2331,8 +2331,8 @@ static void generate_random_aead_testvec(struct aead_request *req,
/* Tag length: in [0, maxauthsize], but usually choose maxauthsize */
authsize = maxauthsize;
if (prandom_u32() % 4 == 0)
authsize = prandom_u32() % (maxauthsize + 1);
if (prandom_u32_max(4) == 0)
authsize = prandom_u32_max(maxauthsize + 1);
if (prefer_inauthentic && authsize < MIN_COLLISION_FREE_AUTHSIZE)
authsize = MIN_COLLISION_FREE_AUTHSIZE;
if (WARN_ON(authsize > maxdatasize))
@ -2342,7 +2342,7 @@ static void generate_random_aead_testvec(struct aead_request *req,
/* AAD, plaintext, and ciphertext lengths */
total_len = generate_random_length(maxdatasize);
if (prandom_u32() % 4 == 0)
if (prandom_u32_max(4) == 0)
vec->alen = 0;
else
vec->alen = generate_random_length(total_len);
@ -2958,8 +2958,8 @@ static void generate_random_cipher_testvec(struct skcipher_request *req,
/* Key: length in [0, maxkeysize], but usually choose maxkeysize */
vec->klen = maxkeysize;
if (prandom_u32() % 4 == 0)
vec->klen = prandom_u32() % (maxkeysize + 1);
if (prandom_u32_max(4) == 0)
vec->klen = prandom_u32_max(maxkeysize + 1);
generate_random_bytes((u8 *)vec->key, vec->klen);
vec->setkey_error = crypto_skcipher_setkey(tfm, vec->key, vec->klen);

4
drivers/block/drbd/drbd_receiver.c
View File

@ -781,7 +781,7 @@ static struct socket *drbd_wait_for_connect(struct drbd_connection *connection,
timeo = connect_int * HZ;
/* 28.5% random jitter */
timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7;
timeo += prandom_u32_max(2) ? timeo / 7 : -timeo / 7;
err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo);
if (err <= 0)
@ -1004,7 +1004,7 @@ static int conn_connect(struct drbd_connection *connection)
drbd_warn(connection, "Error receiving initial packet\n");
sock_release(s);
randomize:
if (prandom_u32() & 1)
if (prandom_u32_max(2))
goto retry;
}
}

2
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
View File

@ -2424,7 +2424,7 @@ gen8_dispatch_bsd_engine(struct drm_i915_private *dev_priv,
/* Check whether the file_priv has already selected one ring. */
if ((int)file_priv->bsd_engine < 0)
file_priv->bsd_engine =
get_random_int() % num_vcs_engines(dev_priv);
prandom_u32_max(num_vcs_engines(dev_priv));
return file_priv->bsd_engine;
}

2
drivers/infiniband/core/cma.c
View File

@ -3807,7 +3807,7 @@ static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
inet_get_local_port_range(net, &low, &high);
remaining = (high - low) + 1;
rover = prandom_u32() % remaining + low;
rover = prandom_u32_max(remaining) + low;
retry:
if (last_used_port != rover) {
struct rdma_bind_list *bind_list;

4
drivers/infiniband/hw/cxgb4/id_table.c
View File

@ -54,7 +54,7 @@ u32 c4iw_id_alloc(struct c4iw_id_table *alloc)
if (obj < alloc->max) {
if (alloc->flags & C4IW_ID_TABLE_F_RANDOM)
alloc->last += prandom_u32() % RANDOM_SKIP;
alloc->last += prandom_u32_max(RANDOM_SKIP);
else
alloc->last = obj + 1;
if (alloc->last >= alloc->max)
@ -85,7 +85,7 @@ int c4iw_id_table_alloc(struct c4iw_id_table *alloc, u32 start, u32 num,
alloc->start = start;
alloc->flags = flags;
if (flags & C4IW_ID_TABLE_F_RANDOM)
alloc->last = prandom_u32() % RANDOM_SKIP;
alloc->last = prandom_u32_max(RANDOM_SKIP);
else
alloc->last = 0;
alloc->max = num;

5
drivers/infiniband/hw/hns/hns_roce_ah.c
View File

@ -41,9 +41,8 @@ static inline u16 get_ah_udp_sport(const struct rdma_ah_attr *ah_attr)
u16 sport;
if (!fl)
sport = get_random_u32() %
(IB_ROCE_UDP_ENCAP_VALID_PORT_MAX + 1 -
IB_ROCE_UDP_ENCAP_VALID_PORT_MIN) +
sport = prandom_u32_max(IB_ROCE_UDP_ENCAP_VALID_PORT_MAX + 1 -
IB_ROCE_UDP_ENCAP_VALID_PORT_MIN) +
IB_ROCE_UDP_ENCAP_VALID_PORT_MIN;
else
sport = rdma_flow_label_to_udp_sport(fl);

3
drivers/infiniband/ulp/rtrs/rtrs-clt.c
View File

@ -1517,8 +1517,7 @@ static void rtrs_clt_err_recovery_work(struct work_struct *work)
rtrs_clt_stop_and_destroy_conns(clt_path);
queue_delayed_work(rtrs_wq, &clt_path->reconnect_dwork,
msecs_to_jiffies(delay_ms +
prandom_u32() %
RTRS_RECONNECT_SEED));
prandom_u32_max(RTRS_RECONNECT_SEED)));
}
static struct rtrs_clt_path *alloc_path(struct rtrs_clt_sess *clt,

2
drivers/md/bcache/request.c
View File

@ -401,7 +401,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
}
if (bypass_torture_test(dc)) {
if ((get_random_int() & 3) == 3)
if (prandom_u32_max(4) == 3)
goto skip;
else
goto rescale;

2
drivers/media/test-drivers/vivid/vivid-touch-cap.c
View File

@ -221,7 +221,7 @@ static void vivid_fill_buff_noise(__s16 *tch_buf, int size)
static inline int get_random_pressure(void)
{
return get_random_int() % VIVID_PRESSURE_LIMIT;
return prandom_u32_max(VIVID_PRESSURE_LIMIT);
}
static void vivid_tch_buf_set(struct v4l2_pix_format *f,

4
drivers/mmc/core/core.c
View File

@ -97,8 +97,8 @@ static void mmc_should_fail_request(struct mmc_host *host,
!should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
return;
data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
data->error = data_errors[prandom_u32_max(ARRAY_SIZE(data_errors))];
data->bytes_xfered = prandom_u32_max(data->bytes_xfered >> 9) << 9;
}
#else /* CONFIG_FAIL_MMC_REQUEST */

2
drivers/mmc/host/dw_mmc.c
View File

@ -1858,7 +1858,7 @@ static void dw_mci_start_fault_timer(struct dw_mci *host)
* Try to inject the error at random points during the data transfer.
*/
hrtimer_start(&host->fault_timer,
ms_to_ktime(prandom_u32() % 25),
ms_to_ktime(prandom_u32_max(25)),
HRTIMER_MODE_REL);
}

4
drivers/mtd/nand/raw/nandsim.c
View File

@ -1405,9 +1405,9 @@ static void ns_do_bit_flips(struct nandsim *ns, int num)
if (bitflips && prandom_u32() < (1 << 22)) {
int flips = 1;
if (bitflips > 1)
flips = (prandom_u32() % (int) bitflips) + 1;
flips = prandom_u32_max(bitflips) + 1;
while (flips--) {
int pos = prandom_u32() % (num * 8);
int pos = prandom_u32_max(num * 8);
ns->buf.byte[pos / 8] ^= (1 << (pos % 8));
NS_WARN("read_page: flipping bit %d in page %d "
"reading from %d ecc: corrected=%u failed=%u\n",

10
drivers/mtd/tests/mtd_nandecctest.c
View File

@ -47,7 +47,7 @@ struct nand_ecc_test {
static void single_bit_error_data(void *error_data, void *correct_data,
size_t size)
{
unsigned int offset = prandom_u32() % (size * BITS_PER_BYTE);
unsigned int offset = prandom_u32_max(size * BITS_PER_BYTE);
memcpy(error_data, correct_data, size);
__change_bit_le(offset, error_data);
@ -58,9 +58,9 @@ static void double_bit_error_data(void *error_data, void *correct_data,
{
unsigned int offset[2];
offset[0] = prandom_u32() % (size * BITS_PER_BYTE);
offset[0] = prandom_u32_max(size * BITS_PER_BYTE);
do {
offset[1] = prandom_u32() % (size * BITS_PER_BYTE);
offset[1] = prandom_u32_max(size * BITS_PER_BYTE);
} while (offset[0] == offset[1]);
memcpy(error_data, correct_data, size);
@ -71,7 +71,7 @@ static void double_bit_error_data(void *error_data, void *correct_data,
static unsigned int random_ecc_bit(size_t size)
{
unsigned int offset = prandom_u32() % (3 * BITS_PER_BYTE);
unsigned int offset = prandom_u32_max(3 * BITS_PER_BYTE);
if (size == 256) {
/*
@ -79,7 +79,7 @@ static unsigned int random_ecc_bit(size_t size)
* and 17th bit) in ECC code for 256 byte data block
*/
while (offset == 16 || offset == 17)
offset = prandom_u32() % (3 * BITS_PER_BYTE);
offset = prandom_u32_max(3 * BITS_PER_BYTE);
}
return offset;

17
drivers/mtd/tests/stresstest.c
View File

@ -45,9 +45,8 @@ static int rand_eb(void)
unsigned int eb;
again:
eb = prandom_u32();
/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
eb %= (ebcnt - 1);
eb = prandom_u32_max(ebcnt - 1);
if (bbt[eb])
goto again;
return eb;
@ -55,20 +54,12 @@ static int rand_eb(void)
static int rand_offs(void)
{
unsigned int offs;
offs = prandom_u32();
offs %= bufsize;
return offs;
return prandom_u32_max(bufsize);
}
static int rand_len(int offs)
{
unsigned int len;
len = prandom_u32();
len %= (bufsize - offs);
return len;
return prandom_u32_max(bufsize - offs);
}
static int do_read(void)
@ -127,7 +118,7 @@ static int do_write(void)
static int do_operation(void)
{
if (prandom_u32() & 1)
if (prandom_u32_max(2))
return do_read();
else
return do_write();

2
drivers/mtd/ubi/debug.c
View File

@ -590,7 +590,7 @@ int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
ubi->dbg.power_cut_counter += prandom_u32() % range;
ubi->dbg.power_cut_counter += prandom_u32_max(range);
}
return 0;
}

6
drivers/mtd/ubi/debug.h
View File

@ -73,7 +73,7 @@ static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
{
if (ubi->dbg.emulate_bitflips)
return !(prandom_u32() % 200);
return !prandom_u32_max(200);
return 0;
}
@ -87,7 +87,7 @@ static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
{
if (ubi->dbg.emulate_io_failures)
return !(prandom_u32() % 500);
return !prandom_u32_max(500);
return 0;
}
@ -101,7 +101,7 @@ static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
{
if (ubi->dbg.emulate_io_failures)
return !(prandom_u32() % 400);
return !prandom_u32_max(400);
return 0;
}

3
drivers/net/ethernet/broadcom/cnic.c
View File

@ -4105,8 +4105,7 @@ static int cnic_cm_alloc_mem(struct cnic_dev *dev)
for (i = 0; i < MAX_CM_SK_TBL_SZ; i++)
atomic_set(&cp->csk_tbl[i].ref_count, 0);
port_id = prandom_u32();
port_id %= CNIC_LOCAL_PORT_RANGE;
port_id = prandom_u32_max(CNIC_LOCAL_PORT_RANGE);
if (cnic_init_id_tbl(&cp->csk_port_tbl, CNIC_LOCAL_PORT_RANGE,
CNIC_LOCAL_PORT_MIN, port_id)) {
cnic_cm_free_mem(dev);

4
drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_io.c
View File

@ -919,8 +919,8 @@ static int csk_wait_memory(struct chtls_dev *cdev,
current_timeo = *timeo_p;
noblock = (*timeo_p ? false : true);
if (csk_mem_free(cdev, sk)) {
current_timeo = (prandom_u32() % (HZ / 5)) + 2;
vm_wait = (prandom_u32() % (HZ / 5)) + 2;
current_timeo = prandom_u32_max(HZ / 5) + 2;
vm_wait = prandom_u32_max(HZ / 5) + 2;
}
add_wait_queue(sk_sleep(sk), &wait);

2
drivers/net/hamradio/baycom_epp.c
View File

@ -438,7 +438,7 @@ static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
if ((--bc->hdlctx.slotcnt) > 0)
return 0;
bc->hdlctx.slotcnt = bc->ch_params.slottime;
if ((prandom_u32() % 256) > bc->ch_params.ppersist)
if (prandom_u32_max(256) > bc->ch_params.ppersist)
return 0;
}
}

2
drivers/net/hamradio/hdlcdrv.c
View File

@ -377,7 +377,7 @@ void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
if ((--s->hdlctx.slotcnt) > 0)
return;
s->hdlctx.slotcnt = s->ch_params.slottime;
if ((prandom_u32() % 256) > s->ch_params.ppersist)
if (prandom_u32_max(256) > s->ch_params.ppersist)
return;
start_tx(dev, s);
}

2
drivers/net/hamradio/yam.c
View File

@ -626,7 +626,7 @@ static void yam_arbitrate(struct net_device *dev)
yp->slotcnt = yp->slot / 10;
/* is random > persist ? */
if ((prandom_u32() % 256) > yp->pers)
if (prandom_u32_max(256) > yp->pers)
return;
yam_start_tx(dev, yp);

2
drivers/net/phy/at803x.c
View File

@ -1758,7 +1758,7 @@ static int qca808x_phy_fast_retrain_config(struct phy_device *phydev)
static int qca808x_phy_ms_random_seed_set(struct phy_device *phydev)
{
u16 seed_value = (prandom_u32() % QCA808X_MASTER_SLAVE_SEED_RANGE);
u16 seed_value = prandom_u32_max(QCA808X_MASTER_SLAVE_SEED_RANGE);
return at803x_debug_reg_mask(phydev, QCA808X_PHY_DEBUG_LOCAL_SEED,
QCA808X_MASTER_SLAVE_SEED_CFG,

2
drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
View File

@ -1128,7 +1128,7 @@ static void brcmf_p2p_afx_handler(struct work_struct *work)
if (afx_hdl->is_listen && afx_hdl->my_listen_chan)
/* 100ms ~ 300ms */
err = brcmf_p2p_discover_listen(p2p, afx_hdl->my_listen_chan,
100 * (1 + prandom_u32() % 3));
100 * (1 + prandom_u32_max(3)));
else
err = brcmf_p2p_act_frm_search(p2p, afx_hdl->peer_listen_chan);

2
drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c
View File

@ -1099,7 +1099,7 @@ static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm,
iwl_mvm_mac_ap_iterator, &data);
if (data.beacon_device_ts) {
u32 rand = (prandom_u32() % (64 - 36)) + 36;
u32 rand = prandom_u32_max(64 - 36) + 36;
mvmvif->ap_beacon_time = data.beacon_device_ts +
ieee80211_tu_to_usec(data.beacon_int * rand /
100);

4
drivers/scsi/fcoe/fcoe_ctlr.c
View File

@ -2233,7 +2233,7 @@ static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
fip->probe_tries++;
wait = prandom_u32() % FIP_VN_PROBE_WAIT;
wait = prandom_u32_max(FIP_VN_PROBE_WAIT);
} else
wait = FIP_VN_RLIM_INT;
mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
@ -3125,7 +3125,7 @@ static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
fcoe_all_vn2vn, 0);
fip->port_ka_time = jiffies +
msecs_to_jiffies(FIP_VN_BEACON_INT +
(prandom_u32() % FIP_VN_BEACON_FUZZ));
prandom_u32_max(FIP_VN_BEACON_FUZZ));
}
if (time_before(fip->port_ka_time, next_time))
next_time = fip->port_ka_time;

2
drivers/scsi/qedi/qedi_main.c
View File

@ -618,7 +618,7 @@ static int qedi_cm_alloc_mem(struct qedi_ctx *qedi)
sizeof(struct qedi_endpoint *)), GFP_KERNEL);
if (!qedi->ep_tbl)
return -ENOMEM;
port_id = prandom_u32() % QEDI_LOCAL_PORT_RANGE;
port_id = prandom_u32_max(QEDI_LOCAL_PORT_RANGE);
if (qedi_init_id_tbl(&qedi->lcl_port_tbl, QEDI_LOCAL_PORT_RANGE,
QEDI_LOCAL_PORT_MIN, port_id)) {
qedi_cm_free_mem(qedi);

2
fs/ceph/inode.c
View File

@ -362,7 +362,7 @@ static int ceph_fill_fragtree(struct inode *inode,
if (nsplits != ci->i_fragtree_nsplits) {
update = true;
} else if (nsplits) {
i = prandom_u32() % nsplits;
i = prandom_u32_max(nsplits);
id = le32_to_cpu(fragtree->splits[i].frag);
if (!__ceph_find_frag(ci, id))
update = true;

2
fs/ceph/mdsmap.c
View File

@ -29,7 +29,7 @@ static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy)
return -1;
/* pick */
n = prandom_u32() % n;
n = prandom_u32_max(n);
for (j = 0, i = 0; i < m->possible_max_rank; i++) {
if (CEPH_MDS_IS_READY(i, ignore_laggy))
j++;

7
fs/ext4/super.c
View File

@ -3782,8 +3782,7 @@ static int ext4_lazyinit_thread(void *arg)
}
if (!progress) {
elr->lr_next_sched = jiffies +
(prandom_u32()
% (EXT4_DEF_LI_MAX_START_DELAY * HZ));
prandom_u32_max(EXT4_DEF_LI_MAX_START_DELAY * HZ);
}
if (time_before(elr->lr_next_sched, next_wakeup))
next_wakeup = elr->lr_next_sched;
@ -3930,8 +3929,8 @@ static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
* spread the inode table initialization requests
* better.
*/
elr->lr_next_sched = jiffies + (prandom_u32() %
(EXT4_DEF_LI_MAX_START_DELAY * HZ));
elr->lr_next_sched = jiffies + prandom_u32_max(
EXT4_DEF_LI_MAX_START_DELAY * HZ);
return elr;
}

2
fs/f2fs/gc.c
View File

@ -282,7 +282,7 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
/* let's select beginning hot/small space first in no_heap mode*/
if (f2fs_need_rand_seg(sbi))
p->offset = prandom_u32() % (MAIN_SECS(sbi) * sbi->segs_per_sec);
p->offset = prandom_u32_max(MAIN_SECS(sbi) * sbi->segs_per_sec);
else if (test_opt(sbi, NOHEAP) &&
(type == CURSEG_HOT_DATA || IS_NODESEG(type)))
p->offset = 0;

8
fs/f2fs/segment.c
View File

@ -2534,7 +2534,7 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
sanity_check_seg_type(sbi, seg_type);
if (f2fs_need_rand_seg(sbi))
return prandom_u32() % (MAIN_SECS(sbi) * sbi->segs_per_sec);
return prandom_u32_max(MAIN_SECS(sbi) * sbi->segs_per_sec);
/* if segs_per_sec is large than 1, we need to keep original policy. */
if (__is_large_section(sbi))
@ -2588,7 +2588,7 @@ static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
curseg->alloc_type = LFS;
if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK)
curseg->fragment_remained_chunk =
prandom_u32() % sbi->max_fragment_chunk + 1;
prandom_u32_max(sbi->max_fragment_chunk) + 1;
}
static int __next_free_blkoff(struct f2fs_sb_info *sbi,
@ -2625,9 +2625,9 @@ static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
/* To allocate block chunks in different sizes, use random number */
if (--seg->fragment_remained_chunk <= 0) {
seg->fragment_remained_chunk =
prandom_u32() % sbi->max_fragment_chunk + 1;
prandom_u32_max(sbi->max_fragment_chunk) + 1;
seg->next_blkoff +=
prandom_u32() % sbi->max_fragment_hole + 1;
prandom_u32_max(sbi->max_fragment_hole) + 1;
}
}
}

8
fs/ubifs/debug.c
View File

@ -2467,7 +2467,7 @@ int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
static inline int chance(unsigned int n, unsigned int out_of)
{
return !!((prandom_u32() % out_of) + 1 <= n);
return !!(prandom_u32_max(out_of) + 1 <= n);
}
@ -2485,13 +2485,13 @@ static int power_cut_emulated(struct ubifs_info *c, int lnum, int write)
if (chance(1, 2)) {
d->pc_delay = 1;
/* Fail within 1 minute */
delay = prandom_u32() % 60000;
delay = prandom_u32_max(60000);
d->pc_timeout = jiffies;
d->pc_timeout += msecs_to_jiffies(delay);
ubifs_warn(c, "failing after %lums", delay);
} else {
d->pc_delay = 2;
delay = prandom_u32() % 10000;
delay = prandom_u32_max(10000);
/* Fail within 10000 operations */
d->pc_cnt_max = delay;
ubifs_warn(c, "failing after %lu calls", delay);
@ -2571,7 +2571,7 @@ static int corrupt_data(const struct ubifs_info *c, const void *buf,
unsigned int from, to, ffs = chance(1, 2);
unsigned char *p = (void *)buf;
from = prandom_u32() % len;
from = prandom_u32_max(len);
/* Corruption span max to end of write unit */
to = min(len, ALIGN(from + 1, c->max_write_size));

14
fs/ubifs/lpt_commit.c
View File

@ -1970,28 +1970,28 @@ static int dbg_populate_lsave(struct ubifs_info *c)
if (!dbg_is_chk_gen(c))
return 0;
if (prandom_u32() & 3)
if (prandom_u32_max(4))
return 0;
for (i = 0; i < c->lsave_cnt; i++)
c->lsave[i] = c->main_first;
list_for_each_entry(lprops, &c->empty_list, list)
c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum;
c->lsave[prandom_u32_max(c->lsave_cnt)] = lprops->lnum;
list_for_each_entry(lprops, &c->freeable_list, list)
c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum;
c->lsave[prandom_u32_max(c->lsave_cnt)] = lprops->lnum;
list_for_each_entry(lprops, &c->frdi_idx_list, list)
c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum;
c->lsave[prandom_u32_max(c->lsave_cnt)] = lprops->lnum;
heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1];
for (i = 0; i < heap->cnt; i++)
c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum;
c->lsave[prandom_u32_max(c->lsave_cnt)] = heap->arr[i]->lnum;
heap = &c->lpt_heap[LPROPS_DIRTY - 1];
for (i = 0; i < heap->cnt; i++)
c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum;
c->lsave[prandom_u32_max(c->lsave_cnt)] = heap->arr[i]->lnum;
heap = &c->lpt_heap[LPROPS_FREE - 1];
for (i = 0; i < heap->cnt; i++)
c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum;
c->lsave[prandom_u32_max(c->lsave_cnt)] = heap->arr[i]->lnum;
return 1;
}

2
fs/ubifs/tnc_commit.c
View File

@ -700,7 +700,7 @@ static int alloc_idx_lebs(struct ubifs_info *c, int cnt)
c->ilebs[c->ileb_cnt++] = lnum;
dbg_cmt("LEB %d", lnum);
}
if (dbg_is_chk_index(c) && !(prandom_u32() & 7))
if (dbg_is_chk_index(c) && !prandom_u32_max(8))
return -ENOSPC;
return 0;
}

2
fs/xfs/libxfs/xfs_alloc.c
View File

@ -1520,7 +1520,7 @@ xfs_alloc_ag_vextent_lastblock(
#ifdef DEBUG
/* Randomly don't execute the first algorithm. */
if (prandom_u32() & 1)
if (prandom_u32_max(2))
return 0;
#endif

2
fs/xfs/libxfs/xfs_ialloc.c
View File

@ -636,7 +636,7 @@ xfs_ialloc_ag_alloc(
/* randomly do sparse inode allocations */
if (xfs_has_sparseinodes(tp->t_mountp) &&
igeo->ialloc_min_blks < igeo->ialloc_blks)
do_sparse = prandom_u32() & 1;
do_sparse = prandom_u32_max(2);
#endif
/*

2
fs/xfs/xfs_error.c
View File

@ -274,7 +274,7 @@ xfs_errortag_test(
ASSERT(error_tag < XFS_ERRTAG_MAX);
randfactor = mp->m_errortag[error_tag];
if (!randfactor || prandom_u32() % randfactor)
if (!randfactor || prandom_u32_max(randfactor))
return false;
xfs_warn_ratelimited(mp,

2
include/linux/nodemask.h
View File

@ -516,7 +516,7 @@ static inline int node_random(const nodemask_t *maskp)
bit = first_node(*maskp);
break;
default:
bit = find_nth_bit(maskp->bits, MAX_NUMNODES, get_random_int() % w);
bit = find_nth_bit(maskp->bits, MAX_NUMNODES, prandom_u32_max(w));
break;
}
return bit;

4
kernel/bpf/core.c
View File

@ -1032,7 +1032,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
hdr->size = size;
hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)),
PAGE_SIZE - sizeof(*hdr));
start = (get_random_int() % hole) & ~(alignment - 1);
start = prandom_u32_max(hole) & ~(alignment - 1);
/* Leave a random number of instructions before BPF code. */
*image_ptr = &hdr->image[start];
@ -1094,7 +1094,7 @@ bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **image_ptr,
hole = min_t(unsigned int, size - (proglen + sizeof(*ro_header)),
BPF_PROG_CHUNK_SIZE - sizeof(*ro_header));
start = (get_random_int() % hole) & ~(alignment - 1);
start = prandom_u32_max(hole) & ~(alignment - 1);
*image_ptr = &ro_header->image[start];
*rw_image = &(*rw_header)->image[start];

4
kernel/locking/test-ww_mutex.c
View File

@ -399,7 +399,7 @@ static int *get_random_order(int count)
order[n] = n;
for (n = count - 1; n > 1; n--) {
r = get_random_int() % (n + 1);
r = prandom_u32_max(n + 1);
if (r != n) {
tmp = order[n];
order[n] = order[r];
@ -538,7 +538,7 @@ static void stress_one_work(struct work_struct *work)
{
struct stress *stress = container_of(work, typeof(*stress), work);
const int nlocks = stress->nlocks;
struct ww_mutex *lock = stress->locks + (get_random_int() % nlocks);
struct ww_mutex *lock = stress->locks + prandom_u32_max(nlocks);
int err;
do {

2
kernel/time/clocksource.c
View File

@ -310,7 +310,7 @@ static void clocksource_verify_choose_cpus(void)
* CPUs that are currently online.
*/
for (i = 1; i < n; i++) {
cpu = prandom_u32() % nr_cpu_ids;
cpu = prandom_u32_max(nr_cpu_ids);
cpu = cpumask_next(cpu - 1, cpu_online_mask);
if (cpu >= nr_cpu_ids)
cpu = cpumask_first(cpu_online_mask);

2
lib/fault-inject.c
View File

@ -139,7 +139,7 @@ bool should_fail(struct fault_attr *attr, ssize_t size)
return false;
}
if (attr->probability <= prandom_u32() % 100)
if (attr->probability <= prandom_u32_max(100))
return false;
if (!fail_stacktrace(attr))

4
lib/find_bit_benchmark.c
View File

@ -174,8 +174,8 @@ static int __init find_bit_test(void)
bitmap_zero(bitmap2, BITMAP_LEN);
while (nbits--) {
__set_bit(prandom_u32() % BITMAP_LEN, bitmap);
__set_bit(prandom_u32() % BITMAP_LEN, bitmap2);
__set_bit(prandom_u32_max(BITMAP_LEN), bitmap);
__set_bit(prandom_u32_max(BITMAP_LEN), bitmap2);
}
test_find_next_bit(bitmap, BITMAP_LEN);

2
lib/kobject.c
View File

@ -694,7 +694,7 @@ static void kobject_release(struct kref *kref)
{
struct kobject *kobj = container_of(kref, struct kobject, kref);
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
unsigned long delay = HZ + HZ * prandom_u32_max(4);
pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
kobject_name(kobj), kobj, __func__, kobj->parent, delay);
INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);

6
lib/reed_solomon/test_rslib.c
View File

@ -183,7 +183,7 @@ static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
do {
/* Must not choose the same location twice */
errloc = prandom_u32() % len;
errloc = prandom_u32_max(len);
} while (errlocs[errloc] != 0);
errlocs[errloc] = 1;
@ -194,12 +194,12 @@ static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
for (i = 0; i < eras; i++) {
do {
/* Must not choose the same location twice */
errloc = prandom_u32() % len;
errloc = prandom_u32_max(len);
} while (errlocs[errloc] != 0);
derrlocs[i] = errloc;
if (ewsc && (prandom_u32() & 1)) {
if (ewsc && prandom_u32_max(2)) {
/* Erasure with the symbol intact */
errlocs[errloc] = 2;
} else {

2
lib/sbitmap.c
View File

@ -33,7 +33,7 @@ static inline unsigned update_alloc_hint_before_get(struct sbitmap *sb,
hint = this_cpu_read(*sb->alloc_hint);
if (unlikely(hint >= depth)) {
hint = depth ? prandom_u32() % depth : 0;
hint = depth ? prandom_u32_max(depth) : 0;
this_cpu_write(*sb->alloc_hint, hint);
}

2
lib/test-string_helpers.c
View File

@ -587,7 +587,7 @@ static int __init test_string_helpers_init(void)
for (i = 0; i < UNESCAPE_ALL_MASK + 1; i++)
test_string_unescape("unescape", i, false);
test_string_unescape("unescape inplace",
get_random_int() % (UNESCAPE_ANY + 1), true);
prandom_u32_max(UNESCAPE_ANY + 1), true);
/* Without dictionary */
for (i = 0; i < ESCAPE_ALL_MASK + 1; i++)

10
lib/test_hexdump.c
View File

@ -149,7 +149,7 @@ static void __init test_hexdump(size_t len, int rowsize, int groupsize,
static void __init test_hexdump_set(int rowsize, bool ascii)
{
size_t d = min_t(size_t, sizeof(data_b), rowsize);
size_t len = get_random_int() % d + 1;
size_t len = prandom_u32_max(d) + 1;
test_hexdump(len, rowsize, 4, ascii);
test_hexdump(len, rowsize, 2, ascii);
@ -208,11 +208,11 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
{
unsigned int i = 0;
int rs = (get_random_int() % 2 + 1) * 16;
int rs = (prandom_u32_max(2) + 1) * 16;
do {
int gs = 1 << i;
size_t len = get_random_int() % rs + gs;
size_t len = prandom_u32_max(rs) + gs;
test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
} while (i++ < 3);
@ -223,11 +223,11 @@ static int __init test_hexdump_init(void)
unsigned int i;
int rowsize;
rowsize = (get_random_int() % 2 + 1) * 16;
rowsize = (prandom_u32_max(2) + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, false);
rowsize = (get_random_int() % 2 + 1) * 16;
rowsize = (prandom_u32_max(2) + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, true);

2
lib/test_list_sort.c
View File

@ -71,7 +71,7 @@ static void list_sort_test(struct kunit *test)
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, el);
/* force some equivalencies */
el->value = prandom_u32() % (TEST_LIST_LEN / 3);
el->value = prandom_u32_max(TEST_LIST_LEN / 3);
el->serial = i;
el->poison1 = TEST_POISON1;
el->poison2 = TEST_POISON2;

6
mm/kasan/kasan_test.c
View File

@ -1292,7 +1292,7 @@ static void match_all_not_assigned(struct kunit *test)
KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
for (i = 0; i < 256; i++) {
size = (get_random_int() % 1024) + 1;
size = prandom_u32_max(1024) + 1;
ptr = kmalloc(size, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
@ -1301,7 +1301,7 @@ static void match_all_not_assigned(struct kunit *test)
}
for (i = 0; i < 256; i++) {
order = (get_random_int() % 4) + 1;
order = prandom_u32_max(4) + 1;
pages = alloc_pages(GFP_KERNEL, order);
ptr = page_address(pages);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
@ -1314,7 +1314,7 @@ static void match_all_not_assigned(struct kunit *test)
return;
for (i = 0; i < 256; i++) {
size = (get_random_int() % 1024) + 1;
size = prandom_u32_max(1024) + 1;
ptr = vmalloc(size);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);

2
mm/slub.c
View File

@ -1881,7 +1881,7 @@ static bool shuffle_freelist(struct kmem_cache *s, struct slab *slab)
return false;
freelist_count = oo_objects(s->oo);
pos = get_random_int() % freelist_count;
pos = prandom_u32_max(freelist_count);
page_limit = slab->objects * s->size;
start = fixup_red_left(s, slab_address(slab));

2
net/802/garp.c
View File

@ -407,7 +407,7 @@ static void garp_join_timer_arm(struct garp_applicant *app)
{
unsigned long delay;
delay = (u64)msecs_to_jiffies(garp_join_time) * prandom_u32() >> 32;
delay = prandom_u32_max(msecs_to_jiffies(garp_join_time));
mod_timer(&app->join_timer, jiffies + delay);
}

2
net/802/mrp.c
View File

@ -592,7 +592,7 @@ static void mrp_join_timer_arm(struct mrp_applicant *app)
{
unsigned long delay;
delay = (u64)msecs_to_jiffies(mrp_join_time) * prandom_u32() >> 32;
delay = prandom_u32_max(msecs_to_jiffies(mrp_join_time));
mod_timer(&app->join_timer, jiffies + delay);
}

2
net/ceph/mon_client.c
View File

@ -222,7 +222,7 @@ static void pick_new_mon(struct ceph_mon_client *monc)
max--;
}
n = prandom_u32() % max;
n = prandom_u32_max(max);
if (o >= 0 && n >= o)
n++;

2
net/ceph/osd_client.c
View File

@ -1479,7 +1479,7 @@ static bool target_should_be_paused(struct ceph_osd_client *osdc,
static int pick_random_replica(const struct ceph_osds *acting)
{
int i = prandom_u32() % acting->size;
int i = prandom_u32_max(acting->size);
dout("%s picked osd%d, primary osd%d\n", __func__,
acting->osds[i], acting->primary);

2
net/core/neighbour.c
View File

@ -111,7 +111,7 @@ static void neigh_cleanup_and_release(struct neighbour *neigh)
unsigned long neigh_rand_reach_time(unsigned long base)
{
return base ? (prandom_u32() % base) + (base >> 1) : 0;
return base ? prandom_u32_max(base) + (base >> 1) : 0;
}
EXPORT_SYMBOL(neigh_rand_reach_time);

43
net/core/pktgen.c
View File

@ -2324,7 +2324,7 @@ static inline int f_pick(struct pktgen_dev *pkt_dev)
pkt_dev->curfl = 0; /*reset */
}
} else {
flow = prandom_u32() % pkt_dev->cflows;
flow = prandom_u32_max(pkt_dev->cflows);
pkt_dev->curfl = flow;
if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
@ -2380,10 +2380,9 @@ static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
__u16 t;
if (pkt_dev->flags & F_QUEUE_MAP_RND) {
t = prandom_u32() %
(pkt_dev->queue_map_max -
pkt_dev->queue_map_min + 1)
+ pkt_dev->queue_map_min;
t = prandom_u32_max(pkt_dev->queue_map_max -
pkt_dev->queue_map_min + 1) +
pkt_dev->queue_map_min;
} else {
t = pkt_dev->cur_queue_map + 1;
if (t > pkt_dev->queue_map_max)
@ -2412,7 +2411,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
__u32 tmp;
if (pkt_dev->flags & F_MACSRC_RND)
mc = prandom_u32() % pkt_dev->src_mac_count;
mc = prandom_u32_max(pkt_dev->src_mac_count);
else {
mc = pkt_dev->cur_src_mac_offset++;
if (pkt_dev->cur_src_mac_offset >=
@ -2438,7 +2437,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
__u32 tmp;
if (pkt_dev->flags & F_MACDST_RND)
mc = prandom_u32() % pkt_dev->dst_mac_count;
mc = prandom_u32_max(pkt_dev->dst_mac_count);
else {
mc = pkt_dev->cur_dst_mac_offset++;
@ -2470,18 +2469,18 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
}
if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
pkt_dev->vlan_id = prandom_u32_max(4096);
}
if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
pkt_dev->svlan_id = prandom_u32_max(4096);
}
if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
if (pkt_dev->flags & F_UDPSRC_RND)
pkt_dev->cur_udp_src = prandom_u32() %
(pkt_dev->udp_src_max - pkt_dev->udp_src_min)
+ pkt_dev->udp_src_min;
pkt_dev->cur_udp_src = prandom_u32_max(
pkt_dev->udp_src_max - pkt_dev->udp_src_min) +
pkt_dev->udp_src_min;
else {
pkt_dev->cur_udp_src++;
@ -2492,9 +2491,9 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
if (pkt_dev->flags & F_UDPDST_RND) {
pkt_dev->cur_udp_dst = prandom_u32() %
(pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
+ pkt_dev->udp_dst_min;
pkt_dev->cur_udp_dst = prandom_u32_max(
pkt_dev->udp_dst_max - pkt_dev->udp_dst_min) +
pkt_dev->udp_dst_min;
} else {
pkt_dev->cur_udp_dst++;
if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
@ -2509,7 +2508,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (imn < imx) {
__u32 t;
if (pkt_dev->flags & F_IPSRC_RND)
t = prandom_u32() % (imx - imn) + imn;
t = prandom_u32_max(imx - imn) + imn;
else {
t = ntohl(pkt_dev->cur_saddr);
t++;
@ -2531,8 +2530,8 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (pkt_dev->flags & F_IPDST_RND) {
do {
t = prandom_u32() %
(imx - imn) + imn;
t = prandom_u32_max(imx - imn) +
imn;
s = htonl(t);
} while (ipv4_is_loopback(s) ||
ipv4_is_multicast(s) ||
@ -2579,9 +2578,9 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
__u32 t;
if (pkt_dev->flags & F_TXSIZE_RND) {
t = prandom_u32() %
(pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
+ pkt_dev->min_pkt_size;
t = prandom_u32_max(pkt_dev->max_pkt_size -
pkt_dev->min_pkt_size) +
pkt_dev->min_pkt_size;
} else {
t = pkt_dev->cur_pkt_size + 1;
if (t > pkt_dev->max_pkt_size)
@ -2590,7 +2589,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
pkt_dev->cur_pkt_size = t;
} else if (pkt_dev->n_imix_entries > 0) {
struct imix_pkt *entry;
__u32 t = prandom_u32() % IMIX_PRECISION;
__u32 t = prandom_u32_max(IMIX_PRECISION);
__u8 entry_index = pkt_dev->imix_distribution[t];
entry = &pkt_dev->imix_entries[entry_index];

2
net/core/stream.c
View File

@ -123,7 +123,7 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p)
DEFINE_WAIT_FUNC(wait, woken_wake_function);
if (sk_stream_memory_free(sk))
current_timeo = vm_wait = (prandom_u32() % (HZ / 5)) + 2;
current_timeo = vm_wait = prandom_u32_max(HZ / 5) + 2;
add_wait_queue(sk_sleep(sk), &wait);

6
net/ipv4/igmp.c
View File

@ -213,7 +213,7 @@ static void igmp_stop_timer(struct ip_mc_list *im)
/* It must be called with locked im->lock */
static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
{
int tv = prandom_u32() % max_delay;
int tv = prandom_u32_max(max_delay);
im->tm_running = 1;
if (!mod_timer(&im->timer, jiffies+tv+2))
@ -222,7 +222,7 @@ static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
static void igmp_gq_start_timer(struct in_device *in_dev)
{
int tv = prandom_u32() % in_dev->mr_maxdelay;
int tv = prandom_u32_max(in_dev->mr_maxdelay);
unsigned long exp = jiffies + tv + 2;
if (in_dev->mr_gq_running &&
@ -236,7 +236,7 @@ static void igmp_gq_start_timer(struct in_device *in_dev)
static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
{
int tv = prandom_u32() % delay;
int tv = prandom_u32_max(delay);
if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
in_dev_hold(in_dev);

2
net/ipv4/inet_connection_sock.c
View File

@ -314,7 +314,7 @@ inet_csk_find_open_port(const struct sock *sk, struct inet_bind_bucket **tb_ret,
if (likely(remaining > 1))
remaining &= ~1U;
offset = prandom_u32() % remaining;
offset = prandom_u32_max(remaining);
/* __inet_hash_connect() favors ports having @low parity
* We do the opposite to not pollute connect() users.
*/

2
net/ipv4/inet_hashtables.c
View File

@ -1037,7 +1037,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
* on low contention the randomness is maximal and on high contention
* it may be inexistent.
*/
i = max_t(int, i, (prandom_u32() & 7) * 2);
i = max_t(int, i, prandom_u32_max(8) * 2);
WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + 2);
/* Head lock still held and bh's disabled */

8
net/ipv6/addrconf.c
View File

@ -104,7 +104,7 @@ static inline u32 cstamp_delta(unsigned long cstamp)
static inline s32 rfc3315_s14_backoff_init(s32 irt)
{
/* multiply 'initial retransmission time' by 0.9 .. 1.1 */
u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
u64 tmp = (900000 + prandom_u32_max(200001)) * (u64)irt;
do_div(tmp, 1000000);
return (s32)tmp;
}
@ -112,11 +112,11 @@ static inline s32 rfc3315_s14_backoff_init(s32 irt)
static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
{
/* multiply 'retransmission timeout' by 1.9 .. 2.1 */
u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
u64 tmp = (1900000 + prandom_u32_max(200001)) * (u64)rt;
do_div(tmp, 1000000);
if ((s32)tmp > mrt) {
/* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
tmp = (900000 + prandom_u32_max(200001)) * (u64)mrt;
do_div(tmp, 1000000);
}
return (s32)tmp;
@ -3967,7 +3967,7 @@ static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
if (ifp->flags & IFA_F_OPTIMISTIC)
rand_num = 0;
else
rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
rand_num = prandom_u32_max(idev->cnf.rtr_solicit_delay ?: 1);
nonce = 0;
if (idev->cnf.enhanced_dad ||

10
net/ipv6/mcast.c
View File

@ -1050,7 +1050,7 @@ bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
/* called with mc_lock */
static void mld_gq_start_work(struct inet6_dev *idev)
{
unsigned long tv = prandom_u32() % idev->mc_maxdelay;
unsigned long tv = prandom_u32_max(idev->mc_maxdelay);
idev->mc_gq_running = 1;
if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
@ -1068,7 +1068,7 @@ static void mld_gq_stop_work(struct inet6_dev *idev)
/* called with mc_lock */
static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
{
unsigned long tv = prandom_u32() % delay;
unsigned long tv = prandom_u32_max(delay);
if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
in6_dev_hold(idev);
@ -1085,7 +1085,7 @@ static void mld_ifc_stop_work(struct inet6_dev *idev)
/* called with mc_lock */
static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
{
unsigned long tv = prandom_u32() % delay;
unsigned long tv = prandom_u32_max(delay);
if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
in6_dev_hold(idev);
@ -1130,7 +1130,7 @@ static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
}
if (delay >= resptime)
delay = prandom_u32() % resptime;
delay = prandom_u32_max(resptime);
if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
refcount_inc(&ma->mca_refcnt);
@ -2574,7 +2574,7 @@ static void igmp6_join_group(struct ifmcaddr6 *ma)
igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
delay = prandom_u32() % unsolicited_report_interval(ma->idev);
delay = prandom_u32_max(unsolicited_report_interval(ma->idev));
if (cancel_delayed_work(&ma->mca_work)) {
refcount_dec(&ma->mca_refcnt);

4
net/netfilter/ipvs/ip_vs_twos.c
View File

@ -71,8 +71,8 @@ static struct ip_vs_dest *ip_vs_twos_schedule(struct ip_vs_service *svc,
* from 0 to total_weight
*/
total_weight += 1;
rweight1 = prandom_u32() % total_weight;
rweight2 = prandom_u32() % total_weight;
rweight1 = prandom_u32_max(total_weight);
rweight2 = prandom_u32_max(total_weight);
/* Pick two weighted servers */
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {

2
net/packet/af_packet.c
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@ -1350,7 +1350,7 @@ static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
if (READ_ONCE(history[i]) == rxhash)
count++;
victim = prandom_u32() % ROLLOVER_HLEN;
victim = prandom_u32_max(ROLLOVER_HLEN);
/* Avoid dirtying the cache line if possible */
if (READ_ONCE(history[victim]) != rxhash)

2
net/sched/act_gact.c
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@ -25,7 +25,7 @@ static struct tc_action_ops act_gact_ops;
static int gact_net_rand(struct tcf_gact *gact)
{
smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
if (prandom_u32() % gact->tcfg_pval)
if (prandom_u32_max(gact->tcfg_pval))
return gact->tcf_action;
return gact->tcfg_paction;
}

2
net/sched/act_sample.c
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@ -168,7 +168,7 @@ static int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a,
psample_group = rcu_dereference_bh(s->psample_group);
/* randomly sample packets according to rate */
if (psample_group && (prandom_u32() % s->rate == 0)) {
if (psample_group && (prandom_u32_max(s->rate) == 0)) {
if (!skb_at_tc_ingress(skb)) {
md.in_ifindex = skb->skb_iif;
md.out_ifindex = skb->dev->ifindex;

4
net/sched/sch_netem.c
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@ -513,8 +513,8 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch,
goto finish_segs;
}
skb->data[prandom_u32() % skb_headlen(skb)] ^=
1<<(prandom_u32() % 8);
skb->data[prandom_u32_max(skb_headlen(skb))] ^=
1<<prandom_u32_max(8);
}
if (unlikely(sch->q.qlen >= sch->limit)) {

2
net/sctp/socket.c
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@ -8319,7 +8319,7 @@ static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
inet_get_local_port_range(net, &low, &high);
remaining = (high - low) + 1;
rover = prandom_u32() % remaining + low;
rover = prandom_u32_max(remaining) + low;
do {
rover++;

2
net/sunrpc/cache.c
View File

@ -677,7 +677,7 @@ static void cache_limit_defers(void)
/* Consider removing either the first or the last */
if (cache_defer_cnt > DFR_MAX) {
if (prandom_u32() & 1)
if (prandom_u32_max(2))
discard = list_entry(cache_defer_list.next,
struct cache_deferred_req, recent);
else

2
net/sunrpc/xprtsock.c
View File

@ -1619,7 +1619,7 @@ static int xs_get_random_port(void)
if (max < min)
return -EADDRINUSE;
range = max - min + 1;
rand = (unsigned short) prandom_u32() % range;
rand = prandom_u32_max(range);
return rand + min;
}

2
net/tipc/socket.c
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@ -3010,7 +3010,7 @@ static int tipc_sk_insert(struct tipc_sock *tsk)
struct net *net = sock_net(sk);
struct tipc_net *tn = net_generic(net, tipc_net_id);
u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
u32 portid = prandom_u32_max(remaining) + TIPC_MIN_PORT;
while (remaining--) {
portid++;

2
net/xfrm/xfrm_state.c
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@ -2072,7 +2072,7 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
} else {
u32 spi = 0;
for (h = 0; h < high-low+1; h++) {
spi = low + prandom_u32()%(high-low+1);
spi = low + prandom_u32_max(high - low + 1);
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
if (x0 == NULL) {
newspi = htonl(spi);