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dev/parport: fix the array out-of-bounds risk

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Fixed array out-of-bounds issues caused by sprintf
by replacing it with snprintf for safer data copying,
ensuring the destination buffer is not overflowed.

Below is the stack trace I encountered during the actual issue:

[ 66.575408s] [pid:5118,cpu4,QThread,4]Kernel panic - not syncing: stack-protector:
Kernel stack is corrupted in: do_hardware_base_addr+0xcc/0xd0 [parport]
[ 66.575408s] [pid:5118,cpu4,QThread,5]CPU: 4 PID: 5118 Comm:
QThread Tainted: G S W O 5.10.97-arm64-desktop #7100.57021.2
[ 66.575439s] [pid:5118,cpu4,QThread,6]TGID: 5087 Comm: EFileApp
[ 66.575439s] [pid:5118,cpu4,QThread,7]Hardware name: HUAWEI HUAWEI QingYun
PGUX-W515x-B081/SP1PANGUXM, BIOS 1.00.07 04/29/2024
[ 66.575439s] [pid:5118,cpu4,QThread,8]Call trace:
[ 66.575469s] [pid:5118,cpu4,QThread,9] dump_backtrace+0x0/0x1c0
[ 66.575469s] [pid:5118,cpu4,QThread,0] show_stack+0x14/0x20
[ 66.575469s] [pid:5118,cpu4,QThread,1] dump_stack+0xd4/0x10c
[ 66.575500s] [pid:5118,cpu4,QThread,2] panic+0x1d8/0x3bc
[ 66.575500s] [pid:5118,cpu4,QThread,3] __stack_chk_fail+0x2c/0x38
[ 66.575500s] [pid:5118,cpu4,QThread,4] do_hardware_base_addr+0xcc/0xd0 [parport]

Signed-off-by: tuhaowen <tuhaowen@uniontech.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/20240708080430.8221-1-tuhaowen@uniontech.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
tuhaowen 2024-07-08 16:04:30 +08:00 committed by Greg Kroah-Hartman
parent feb1f0cba1
commit ab11dac93d
1 changed files with 12 additions and 12 deletions
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24
drivers/parport/procfs.c
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@ -51,12 +51,12 @@ static int do_active_device(struct ctl_table *table, int write,
for (dev = port->devices; dev ; dev = dev->next) {
if(dev == port->cad) {
len += sprintf(buffer, "%s\n", dev->name);
len += snprintf(buffer, sizeof(buffer), "%s\n", dev->name);
}
}
if(!len) {
len += sprintf(buffer, "%s\n", "none");
len += snprintf(buffer, sizeof(buffer), "%s\n", "none");
}
if (len > *lenp)
@ -87,19 +87,19 @@ static int do_autoprobe(struct ctl_table *table, int write,
}
if ((str = info->class_name) != NULL)
len += sprintf (buffer + len, "CLASS:%s;\n", str);
len += snprintf (buffer + len, sizeof(buffer) - len, "CLASS:%s;\n", str);
if ((str = info->model) != NULL)
len += sprintf (buffer + len, "MODEL:%s;\n", str);
len += snprintf (buffer + len, sizeof(buffer) - len, "MODEL:%s;\n", str);
if ((str = info->mfr) != NULL)
len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
len += snprintf (buffer + len, sizeof(buffer) - len, "MANUFACTURER:%s;\n", str);
if ((str = info->description) != NULL)
len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
len += snprintf (buffer + len, sizeof(buffer) - len, "DESCRIPTION:%s;\n", str);
if ((str = info->cmdset) != NULL)
len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
len += snprintf (buffer + len, sizeof(buffer) - len, "COMMAND SET:%s;\n", str);
if (len > *lenp)
len = *lenp;
@ -117,7 +117,7 @@ static int do_hardware_base_addr(struct ctl_table *table, int write,
void *result, size_t *lenp, loff_t *ppos)
{
struct parport *port = (struct parport *)table->extra1;
char buffer[20];
char buffer[64];
int len = 0;
if (*ppos) {
@ -128,7 +128,7 @@ static int do_hardware_base_addr(struct ctl_table *table, int write,
if (write) /* permissions prevent this anyway */
return -EACCES;
len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
len += snprintf (buffer, sizeof(buffer), "%lu\t%lu\n", port->base, port->base_hi);
if (len > *lenp)
len = *lenp;
@ -155,7 +155,7 @@ static int do_hardware_irq(struct ctl_table *table, int write,
if (write) /* permissions prevent this anyway */
return -EACCES;
len += sprintf (buffer, "%d\n", port->irq);
len += snprintf (buffer, sizeof(buffer), "%d\n", port->irq);
if (len > *lenp)
len = *lenp;
@ -182,7 +182,7 @@ static int do_hardware_dma(struct ctl_table *table, int write,
if (write) /* permissions prevent this anyway */
return -EACCES;
len += sprintf (buffer, "%d\n", port->dma);
len += snprintf (buffer, sizeof(buffer), "%d\n", port->dma);
if (len > *lenp)
len = *lenp;
@ -213,7 +213,7 @@ static int do_hardware_modes(struct ctl_table *table, int write,
#define printmode(x) \
do { \
if (port->modes & PARPORT_MODE_##x) \
len += sprintf(buffer + len, "%s%s", f++ ? "," : "", #x); \
len += snprintf(buffer + len, sizeof(buffer) - len, "%s%s", f++ ? "," : "", #x); \
} while (0)
int f = 0;
printmode(PCSPP);