From: "Dmitry V. Levin" <ldv@strace.io>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Renzo Davoli <renzo@cs.unibo.it>,
linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Shuah Khan <shuah@kernel.org>, Alexey Gladkov <legion@kernel.org>,
Eugene Syromyatnikov <evgsyr@gmail.com>,
Mike Frysinger <vapier@gentoo.org>,
Davide Berardi <berardi.dav@gmail.com>,
strace-devel@lists.strace.io
Subject: Re: [PATCH 1/5] ptrace: add PTRACE_SYSCALL_INFO_SECCOMP_SKIP
Date: Thu, 2 Jul 2026 14:07:55 +0300 [thread overview]
Message-ID: <20260702110755.GA16303@strace.io> (raw)
In-Reply-To: <akY2NlR4NXi-5O6v@redhat.com>
On Thu, Jul 02, 2026 at 11:58:14AM +0200, Oleg Nesterov wrote:
[...]
> @@ -1047,6 +1069,11 @@ ptrace_set_syscall_info_entry(struct task_struct *child, struct pt_regs *regs,
> if (nr != info->entry.nr)
> return -ERANGE;
>
> + syscall_set_nr(child, regs, nr);
> + if (nr == -1)
> + return __set_syscall_info_exit(child, regs,
> + info->entry.rval, info->entry.is_error);
The kernel shouldn't suddenly start interpreting info->entry.rval and
info->entry.is_error because the current users of this interface are not
aware that the kernel might be doing it. If we want to extend
PTRACE_SYSCALL_INFO_ENTRY/PTRACE_SYSCALL_INFO_SECCOMP this way, we would
have to require setting a flag in info->flags signalling the kernel that
the user requests this new behaviour.
--
ldv
next prev parent reply other threads:[~2026-07-02 11:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-01 15:05 [PATCH 0/5] ptrace_set_syscall_info: add support for seccomp syscall skipping and instruction pointer modification Renzo Davoli
2026-07-01 15:05 ` [PATCH 1/5] ptrace: add PTRACE_SYSCALL_INFO_SECCOMP_SKIP Renzo Davoli
2026-07-02 8:43 ` Oleg Nesterov
2026-07-02 9:09 ` Renzo Davoli
2026-07-02 9:58 ` Oleg Nesterov
2026-07-02 11:07 ` Dmitry V. Levin [this message]
2026-07-02 11:31 ` Oleg Nesterov
2026-07-02 11:39 ` Oleg Nesterov
2026-07-02 14:47 ` Oleg Nesterov
2026-07-02 16:10 ` Renzo Davoli
2026-07-01 15:05 ` [PATCH 2/5] selftests/ptrace: add a test case for PTRACE_SYSCALL_INFO_SECCOMP_SKIP Renzo Davoli
2026-07-01 15:05 ` [PATCH 3/5] asm/ptrace.h: add instruction_pointer_set Renzo Davoli
2026-07-01 15:05 ` [PATCH 4/5] ptrace: add PTRACE_SYSCALL_INFO_FLAG_SET_IP Renzo Davoli
2026-07-01 15:05 ` [PATCH 5/5] selftests/ptrace: add a test case for PTRACE_SYSCALL_INFO_FLAG_SET_IP Renzo Davoli
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