Vulnerability CVE-2024-38576
Published: 2024-06-19

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

rcu: Fix buffer overflow in print_cpu_stall_info()

The rcuc-starvation output from print_cpu_stall_info() might overflow the
buffer if there is a huge difference in jiffies difference. The situation
might seem improbable, but computers sometimes get very confused about
time, which can result in full-sized integers, and, in this case,
buffer overflow.

Also, the unsigned jiffies difference is printed using %ld, which is
normally for signed integers. This is intentional for debugging purposes,
but it is not obvious from the code.

This commit therefore changes sprintf() to snprintf() and adds a
clarifying comment about intention of %ld format.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

 References:
https://git.kernel.org/stable/c/e2228ed3fe7aa838fba87c79a76fb1ad9ea47138
https://git.kernel.org/stable/c/afb39909bfb5c08111f99e21bf5be7505f59ff1c
https://git.kernel.org/stable/c/9351e1338539cb7f319ffc1210fa9b2aa27384b5
https://git.kernel.org/stable/c/4c3e2ef4d8ddd313c8ce3ac30505940bea8d6257
https://git.kernel.org/stable/c/3758f7d9917bd7ef0482c4184c0ad673b4c4e069
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