Re: [GIT PULL] execve updates for v6.12-rc1

[Eric W. Biederman]

Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:

> On Thu, 26 Sept 2024 at 11:29, Vegard Nossum <vegard.nossum@xxxxxxxxxx> wrote:
>>
>> # first bad commit: [fb97d2eb542faf19a8725afbd75cbc2518903210]
>> binfmt_elf, coredump: Log the reason of the failed core dumps
>>
>> I have to admit I don't immediately see what's wrong with the patch.
>
> That commit looks entirely broken.
>
> I *suspect* that the problem is the crazy "get_task_comm()" in that
> takes the task lock inside coredump_report_failure().
>
> But honestly, I'm not going to bother even trying to debug this. The
> whole notion was broken. People who have problems with truncated
> core-files should be looking at their debuggers, not asking the kernel
> for help.

One of the common causes for coredump truncation is weird interactions
between io_uring and the coredump code.  (AKA kernel bugs).

That is something you can't ask your debugger to tell you.

So from 10,000 feet I think the idea is sane.

Eric