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Test your applicationsUpgrade SLES:15.6
kernel-coco_debug
to version 6.4.0-15061.9.coco15sp6.1 or higher.
Note: Versions mentioned in the description apply only to the upstream kernel-coco_debug
package and not the kernel-coco_debug
package as distributed by SLES
.
See How to fix?
for SLES:15.6
relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
uprobe: avoid out-of-bounds memory access of fetching args
Uprobe needs to fetch args into a percpu buffer, and then copy to ring buffer to avoid non-atomic context problem.
Sometimes user-space strings, arrays can be very large, but the size of percpu buffer is only page size. And store_trace_args() won't check whether these data exceeds a single page or not, caused out-of-bounds memory access.
It could be reproduced by following steps:
\#include <stdio.h> \#include <stdlib.h> \#include <string.h>
// If string length large than MAX_STRING_SIZE, the fetch_store_strlen() // will return 0, cause __get_data_size() return shorter size, and // store_trace_args() will not trigger out-of-bounds access. // So make string length less than 4096. #define STRLEN 4093
void generate_string(char *str, int n) { int i; for (i = 0; i < n; ++i) { char c = i % 26 + 'a'; str[i] = c; } str[n-1] = '\0'; }
void print_string(char *str) { printf("%s\n", str); }
int main() { char tmp[STRLEN];
generate_string(tmp, STRLEN); print_string(tmp); return 0;
}
compile program
gcc -o test test.c
get the offset of print_string()
objdump -t test | grep -w print_string
0000000000401199 g F .text 000000000000001b print_string
off=0x1199
cd /sys/kernel/debug/tracing/ echo "p /root/test:${off} arg1=+0(%di):ustring arg2=$comm arg3=+0(%di):ustring" > uprobe_events echo 1 > events/uprobes/enable echo 1 > tracing_on
test
, and kasan will report error.This commit enforces the buffer's maxlen less than a page-size to avoid store_trace_args() out-of-memory access.