Re: [GIT PULL] tracing: More updates for 6.13

[Yafang Shao]

On Fri, Nov 29, 2024 at 7:23 AM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> On Thu, 28 Nov 2024 15:51:20 -0500
> Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
>
> > >
> > > I've pushed out my resolution, and hopefully rust people can actually
> > > test it. I might just be full of it.
> >
> > Looks better than what I had. I'll kick my tests on it just as a sanity
> > check.
>
> And my tests failed. But not for this change. The build failed. Config attached:
>
>   CC      kernel/time/tick-broadcast.o
> In file included from /work/build/trace/nobackup/linux-test.git/include/linux/string.h:390,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/bitmap.h:13,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/cpumask.h:12,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/smp.h:13,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/lockdep.h:14,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/spinlock.h:63,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/wait.h:9,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/wait_bit.h:8,
>                  from /work/build/trace/nobackup/linux-test.git/include/linux/fs.h:6,
>                  from /work/build/trace/nobackup/linux-test.git/kernel/auditsc.c:37:
> In function ‘sized_strscpy’,
>     inlined from ‘__audit_ptrace’ at /work/build/trace/nobackup/linux-test.git/kernel/auditsc.c:2732:2:
> /work/build/trace/nobackup/linux-test.git/include/linux/fortify-string.h:293:17: error: call to ‘__write_overflow’ declared with attribute error: detected write beyond size of object (1st parameter)
>   293 |                 __write_overflow();
>       |                 ^~~~~~~~~~~~~~~~~~
>   CC      arch/x86/kernel/tracepoint.o
> In function ‘sized_strscpy’,
>     inlined from ‘audit_signal_info_syscall’ at /work/build/trace/nobackup/linux-test.git/kernel/auditsc.c:2759:3:
> /work/build/trace/nobackup/linux-test.git/include/linux/fortify-string.h:293:17: error: call to ‘__write_overflow’ declared with attribute error: detected write beyond size of object (1st parameter)
>   293 |                 __write_overflow();
>       |                 ^~~~~~~~~~~~~~~~~~
>   AR      drivers/nvmem/built-in.a
> make[4]: *** [/work/build/trace/nobackup/linux-test.git/scripts/Makefile.build:229: kernel/auditsc.o] Error 1
>
> I'm currently too busy eating turkey, so I'll let someone else figure this out.

The issue appears to be a known GCC bug, though the root cause remains
unclear at this time.

A potential workaround has been proposed, which you can find here:
https://lore.kernel.org/linux-hardening/202410171059.C2C395030@keescook/

However, it seems that the patch has not yet been accepted into the mainline.


--
Regards
Yafang