linux-hardening - Re: [BUG] missing return thunk: __ret+0x5/0x7e-_

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Date:   Thu, 17 Aug 2023 23:49:52 +0300
From:   Nikolay Borisov <nik.borisov@...e.com>
To:     paulmck@...nel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, x86@...nel.org
Cc:     peterz@...radead.org, keescook@...omium.org, elver@...gle.com,
        dvyukov@...gle.com, glider@...gle.com
Subject: Re: [BUG] missing return thunk: __ret+0x5/0x7e-__ret+0x0/0x7e: e9 f6
 ff ff ff



On 16.08.23 г. 20:54 ч., Paul E. McKenney wrote:
> Hello!
> 
> I hit the splat at the end of this message in recent mainline, and has
> appeared some time since v6.5-rc1.  Should I be worried?
> 
> Reproducer on a two-socket hyperthreaded 20-core-per-socket x86 system:
> 
> tools/testing/selftests/rcutorture/bin/kvm.sh --allcpus --duration 5m --torture refscale --kcsan --kconfig "CONFIG_NR_CPUS=40" --kmake-args "CC=clang" --bootargs "refscale.scale_type=typesafe_seqlock refscale.nreaders=40 refscale.loops=10000 refscale.holdoff=20 torture.disable_onoff_at_boot refscale.verbose_batched=5 torture.verbose_sleep_frequency=8 torture.verbose_sleep_duration=5"
> 
> This is from overnight testing that hit this only in the KCSAN runs.
> The KASAN and non-debug runs had no trouble.
> 
> This commit added the warning long ago:
> 
> 65cdf0d623be ("x86/alternative: Report missing return thunk details")
> 
> Thoughts?
> 
> 							Thanx, Paul

Likely fixed by the following commit in tip/urgen : 
4ae68b26c3ab5a82aa271e6e9fc9b1a06e1d6b40 [tip: x86/urgent] objtool/x86: 
Fix SRSO mess