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scsi: target: Replace strlcpy() with strscpy()

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strlcpy() reads the entire source buffer first.  This read may exceed the
destination size limit.  This is both inefficient and can lead to linear
read overflows if a source string is not NUL-terminated [1].  In an effort
to remove strlcpy() completely [2], replace strlcpy() here with strscpy().

Direct replacement is safe here since return value of -errno is used to
check for truncation instead of sizeof(dest).

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Link: https://lore.kernel.org/r/20230831143638.232596-1-azeemshaikh38@gmail.com
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Azeem Shaikh 2023-08-31 14:36:38 +00:00 committed by Martin K. Petersen
parent d0b0822e32
commit 5c584fe609
1 changed files with 12 additions and 12 deletions
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24
drivers/target/target_core_configfs.c
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@ -1392,16 +1392,16 @@ static ssize_t target_wwn_vendor_id_store(struct config_item *item,
/* +2 to allow for a trailing (stripped) '\n' and null-terminator */
unsigned char buf[INQUIRY_VENDOR_LEN + 2];
char *stripped = NULL;
size_t len;
ssize_t len;
ssize_t ret;
len = strlcpy(buf, page, sizeof(buf));
if (len < sizeof(buf)) {
len = strscpy(buf, page, sizeof(buf));
if (len > 0) {
/* Strip any newline added from userspace. */
stripped = strstrip(buf);
len = strlen(stripped);
}
if (len > INQUIRY_VENDOR_LEN) {
if (len < 0 || len > INQUIRY_VENDOR_LEN) {
pr_err("Emulated T10 Vendor Identification exceeds"
" INQUIRY_VENDOR_LEN: " __stringify(INQUIRY_VENDOR_LEN)
"\n");
@ -1448,16 +1448,16 @@ static ssize_t target_wwn_product_id_store(struct config_item *item,
/* +2 to allow for a trailing (stripped) '\n' and null-terminator */
unsigned char buf[INQUIRY_MODEL_LEN + 2];
char *stripped = NULL;
size_t len;
ssize_t len;
ssize_t ret;
len = strlcpy(buf, page, sizeof(buf));
if (len < sizeof(buf)) {
len = strscpy(buf, page, sizeof(buf));
if (len > 0) {
/* Strip any newline added from userspace. */
stripped = strstrip(buf);
len = strlen(stripped);
}
if (len > INQUIRY_MODEL_LEN) {
if (len < 0 || len > INQUIRY_MODEL_LEN) {
pr_err("Emulated T10 Vendor exceeds INQUIRY_MODEL_LEN: "
__stringify(INQUIRY_MODEL_LEN)
"\n");
@ -1504,16 +1504,16 @@ static ssize_t target_wwn_revision_store(struct config_item *item,
/* +2 to allow for a trailing (stripped) '\n' and null-terminator */
unsigned char buf[INQUIRY_REVISION_LEN + 2];
char *stripped = NULL;
size_t len;
ssize_t len;
ssize_t ret;
len = strlcpy(buf, page, sizeof(buf));
if (len < sizeof(buf)) {
len = strscpy(buf, page, sizeof(buf));
if (len > 0) {
/* Strip any newline added from userspace. */
stripped = strstrip(buf);
len = strlen(stripped);
}
if (len > INQUIRY_REVISION_LEN) {
if (len < 0 || len > INQUIRY_REVISION_LEN) {
pr_err("Emulated T10 Revision exceeds INQUIRY_REVISION_LEN: "
__stringify(INQUIRY_REVISION_LEN)
"\n");