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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=PaFMpquh; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with UTF8SMTPS id C547D606A330; Wed, 21 Oct 2026 11:51:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=PaFMpquh Received: by smtp.kernel.org (Postfix) with UTF8SMTPSA id 225C41F000C4; Wed, 21 Oct 2026 11:51:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792583519; bh=8+uhPZSAcrIBVQRFHA3AjpuARr+Y5uh4d7ju5klGlzE=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=PaFMpquhWfs9AjCJcWqAxr2pJDk2EP+jvDiazGWfurMpt29HXvJzjzX7nLUWKWUa5 IJnwObm7CvlCikN3jQ1dfZk+K6LR8clGd4eVwfgFy29C8sNApPK4SLbopmXVzGXoBP 8TyqCZcJyY31lbOVdN+/XDKoGXtO86Wm8n186DB6gwRzSHD0WeRBRvrFvsHB6kendB 4fOTgyRFULJbSLyuE6i71lafZ1ICwBJC/GhXCWE5thyWUEjiKdFMrs4YyMTZS9SrQH TAwW4dpwDPI7VArxk4+0szI+YM3JaBAh4imjcil/wk5gtOEW8vHWzAx/EYHXVD0Feq M6BuzMdv5aaMQ== Date: Wed, 21 Oct 2026 14:51:55 +0300 From: Jarkko Sakkinen To: syzbot ci Cc: corbet@lwn.net, dhowells@redhat.com, ebiggers@kernel.org, jannh@google.com, jmorris@namei.org, keyrings@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, paul@paul-moore.com, rdunlap@infradead.org, serge@hallyn.com, skhan@linuxfoundation.org, stable@vger.kernel.org, syzbot@lists.linux.dev, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot ci] Re: KEYS: Return user session keyring on lookup Message-ID: References: <20261019145624.309790-1-jarkko@kernel.org> <6ad875b6.e74039fe.1cb511.0000.GAE@google.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6ad875b6.e74039fe.1cb511.0000.GAE@google.com> On Wed, Oct 21, 2026 at 01:20:06AM -0700, syzbot ci wrote: > syzbot ci has tested the following series > > [v2] KEYS: Return user session keyring on lookup > https://lore.kernel.org/all/20261019145624.309790-1-jarkko@kernel.org > * [PATCH v2 1/2] KEYS: Return user session keyring on lookup > * [PATCH v2 2/2] KEYS: Reject keyring creation with overridden credentials > > and found the following issue: > general protection fault in keyctl_session_to_parent > > Full report is available here: > https://ci.syzbot.org/series/7566814a-52ba-4f0b-b506-d7adf67fda29 > > *** > > general protection fault in keyctl_session_to_parent > > tree: linux-next > URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next > base: 17a7501b9612a52b38bc57e33c7b64636d438bc0 > arch: amd64 > compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 > config: https://ci.syzbot.org/builds/eee373c7-f447-49cf-a350-83830580c7b2/config > > Oops: general protection fault, probably for non-canonical address 0xdffffc000000001b: 0000 [#1] SMP KASAN PTI > KASAN: null-ptr-deref in range [0x00000000000000d8-0x00000000000000df] > CPU: 0 UID: 0 PID: 5730 Comm: syz.0.6 Not tainted syzkaller #0 PREEMPT(full) > Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > RIP: 0010:keyctl_session_to_parent+0x825/0xa30 > Code: 35 3b fd e9 fe fa ff ff e8 38 35 3b fd e9 f4 fa ff ff e8 2e 35 3b fd 48 8b 54 24 20 48 81 c2 d8 00 00 00 48 89 d0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 b2 01 00 00 8b 2a 89 ef 8b 5c 24 1c 89 de > RSP: 0018:ffffc9000621fc70 EFLAGS: 00010006 > RAX: 000000000000001b RBX: dffffc0000000000 RCX: ffff88810b603c00 > RDX: 00000000000000d8 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 > R10: dffffc0000000000 R11: fffff52000c43f7c R12: ffff88811a010000 > R13: 0000000000000000 R14: ffff88810c2631a8 R15: 0000000000000000 > FS: 00007f7f2068b6c0(0000) GS:ffff88818c4bf000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f7f2068aff8 CR3: 000000010cae8000 CR4: 00000000000006f0 > Call Trace: > > __se_sys_keyctl+0x780/0x9d0 > do_syscall_64+0x166/0x520 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f7f1f79f559 > Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f7f2068b028 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa > RAX: ffffffffffffffda RBX: 00007f7f1fa26270 RCX: 00007f7f1f79f559 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000012 > RBP: 00007f7f1f836b20 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 00007f7f1fa26308 R14: 00007f7f1fa26270 R15: 00007ffe789f59b8 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:keyctl_session_to_parent+0x825/0xa30 > Code: 35 3b fd e9 fe fa ff ff e8 38 35 3b fd e9 f4 fa ff ff e8 2e 35 3b fd 48 8b 54 24 20 48 81 c2 d8 00 00 00 48 89 d0 48 c1 e8 03 <0f> b6 04 18 84 c0 0f 85 b2 01 00 00 8b 2a 89 ef 8b 5c 24 1c 89 de > RSP: 0018:ffffc9000621fc70 EFLAGS: 00010006 > RAX: 000000000000001b RBX: dffffc0000000000 RCX: ffff88810b603c00 > RDX: 00000000000000d8 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000003 R09: 0000000000000004 > R10: dffffc0000000000 R11: fffff52000c43f7c R12: ffff88811a010000 > R13: 0000000000000000 R14: ffff88810c2631a8 R15: 0000000000000000 > FS: 00007f7f2068b6c0(0000) GS:ffff88818c4bf000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f7f2068aff8 CR3: 000000010cae8000 CR4: 00000000000006f0 > > > *** > > If these findings have caused you to resend the series or submit a > separate fix, please add the following tag to your commit message: > Tested-by: syzbot@syzkaller.appspotmail.com > > --- > This report is generated by a bot. It may contain errors. > syzbot ci engineers can be reached at syzkaller@googlegroups.com. > > To test a fix for this bug, please reply with `#syz test` > (on a separate line) and attach the patch to the email. > > Notes: > - The patch will be applied on top of the tested series (as an > incremental fix). > - To test a new version of the whole series, please send it directly > to syzbot@lists.linux.dev. > - Arguments like custom git repos and branches are not supported. This helps, I save this to my TODO-folder (no time to address this week). Br, Jarkko