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Mon, 21 Sep 2026 14:14:12 +0000 (UTC) Received: by fedora (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 21 Sep 2026 16:14:16 +0200 (CEST) Date: Mon, 21 Sep 2026 16:14:10 +0200 From: Oleg Nesterov To: Christian Brauner Cc: Chris Mason , linux-fsdevel@vger.kernel.org, Jens Axboe , Alexander Viro , Jan Kara , NeilBrown , Ingo Molnar , Peter Zijlstra , linux-mm@kvack.org, io-uring@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v3 09/17] ptrace: refuse to change the signal mask of a user worker Message-ID: References: <20260921-work-coredump-fixes-v3-0-8e4adb1619e6@kernel.org> <20260921-work-coredump-fixes-v3-9-8e4adb1619e6@kernel.org> MIME-Version: 1.0 In-Reply-To: <20260921-work-coredump-fixes-v3-9-8e4adb1619e6@kernel.org> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-MFC-PROC-ID: ahSDyYDNUsd7Rl4sif4h6hPLfSrua6pTmmB_JP11Sp8_1790000057 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 4E6C41C000B X-Stat-Signature: x8pjbkx468wnxqjunx73or7d57bsecy5 X-HE-Tag: 1790000065-784949 X-HE-Meta: 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 +7tEPFqO oz9sFvxR6VGMipbKbl5qY8J4L6FsionJC6Y9igcd97/8MP0tbtzxg2SQq7d5q6sUeQJWuGm3HSrgrwQ0xDENugai61B+7sXk+HHY7MrK1KotSdWLiWDCWWoCZTjSiSfKb+xjTKMiq5DQXlIVjZy0hs/DnVajhh20dsfV9Tpm4841m2u1HhxwgKKGFpIjlr9mHqfxgmRynzXTUOHFxIrLpvBc999ttylpw60buWMUYvr2AoYuBhsnXXwB8diyMDp01aKcrAU8SxpHTA7HG63/e9LbhGds5y+1Gozwmvklw1Qs5RCFXj78oVtLIwPLhgoGVPJoZJLdewhDWUawLhMoHyosLlO6NJevt39j8aFo3OdcYW9ndQjGWPf+poxXP5A/em1Z3b+cfjf+r+bZDq2BegavavpcLTYG6t+87GQjw7e4nITuZwCa18PpRiw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 09/21, Christian Brauner wrote: > > --- a/kernel/ptrace.c > +++ b/kernel/ptrace.c > @@ -1227,6 +1227,12 @@ int ptrace_request(struct task_struct *child, long request, > case PTRACE_SETSIGMASK: { > sigset_t new_set; > > + /* A user worker only ever takes SIGKILL and SIGSTOP. */ > + if (child->flags & PF_USER_WORKER) { > + ret = -EPERM; > + break; > + } Acked-by: Oleg Nesterov