From: Konstantin Khorenko <khorenko@virtuozzo.com>
To: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH vz10] selftests: syscall_user_dispatch: keep the frame pointer in sud_benchmark
Date: Wed, 23 Sep 2026 20:59:29 +0200 [thread overview]
Message-ID: <179018996909.3143442.9111479446736422514.b4-review@b4> (raw)
In-Reply-To: <20260908213300.2677462-1-eva.kurchatova@virtuozzo.com>
On Wed, 09 Sep 2026 00:32:59 +0300, Eva Kurchatova <eva.kurchatova@virtuozzo.com> wrote:
> The SIGSYS handler returns by hand: it loads __NR_rt_sigreturn, runs
> leaveq to drop its frame, adjusts the stack and issues the syscall. leaveq
> restores the stack from the frame pointer, so the sequence only works in a
> function that has one.
>
> gcc omits the frame pointer from -O1 up, so the handler restores a stack
> that is not the signal frame and rt_sigreturn resumes at a bogus address:
>
> [...]
Reviewed-by: Konstantin Khorenko <khorenko@virtuozzo.com>
--
Konstantin Khorenko <khorenko@virtuozzo.com>
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next prev parent reply other threads:[~2026-09-23 19:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-08 21:32 Eva Kurchatova
2026-09-23 18:59 ` Konstantin Khorenko [this message]
2026-09-23 19:23 ` Konstantin Khorenko
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