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, let's start using

it.

Callers of boot_init_stack_canary need to use this function attribute

unless they're 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.