Description

In the Linux kernel, the following vulnerability has been resolved:

EDAC/thunderx: Fix possible out-of-bounds string access

Enabling -Wstringop-overflow globally exposes a warning for a common bug
in the usage of strncat():

drivers/edac/thunderx_edac.c: In function 'thunderx_ocx_com_threaded_isr':
drivers/edac/thunderx_edac.c:1136:17: error: 'strncat' specified bound 1024 equals destination size [-Werror=stringop-overflow=]
1136 | strncat(msg, other, OCX_MESSAGE_SIZE);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
...
1145 | strncat(msg, other, OCX_MESSAGE_SIZE);
...
1150 | strncat(msg, other, OCX_MESSAGE_SIZE);

...

Apparently the author of this driver expected strncat() to behave the
way that strlcat() does, which uses the size of the destination buffer
as its third argument rather than the length of the source buffer. The
result is that there is no check on the size of the allocated buffer.

Change it to strlcat().

[ bp: Trim compiler output, fixup commit message. ]

Classification

CVE ID: CVE-2023-52464

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/71c17ee02538802ceafc830f0736aa35b564e601
https://git.kernel.org/stable/c/5da3b6e7196f0b4f3728e4e25eb20233a9ddfaf6
https://git.kernel.org/stable/c/6aa7865ba7ff7f0ede0035180fb3b9400ceb405a
https://git.kernel.org/stable/c/700cf4bead80fac994dcc43ae1ca5d86d8959b21
https://git.kernel.org/stable/c/9dbac9fdae6e3b411fc4c3fca3bf48f70609c398
https://git.kernel.org/stable/c/e1c86511241588efffaa49556196f09a498d5057
https://git.kernel.org/stable/c/426fae93c01dffa379225eb2bd4d3cdc42c6eec5
https://git.kernel.org/stable/c/475c58e1a471e9b873e3e39958c64a2d278275c8

Timeline