CVE-2023-53491

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

start_kernel: Add __no_stack_protector function attribute

Back during the discussion of commit a9a3ed1eff36 (x86: Fix early boot crash on gcc-10, third try) we discussed the need for a function attribute to control the omission of stack protectors on a per-function basis; at the time Clang had support for no_stack_protector but GCC did not. This was fixed in gcc-11. Now that the function attribute is available, lets start using it.

Callers of boot_init_stack_canary need to use this function attribute unless theyre compiled with -fno-stack-protector, otherwise the canary stored in the stack slot of the caller will differ upon the call to boot_init_stack_canary. This will lead to a call to __stack_chk_fail() then panic.

Affected Software

References

• https://git.kernel.org/stable/c/25e73018b4093e0cfbcec5dc4a4bb86d0b69ed56
• https://git.kernel.org/stable/c/514ca14ed5444b911de59ed3381dfd195d99fe4b