CVE-2024-38576 Information

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.

Reference

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