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X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69935769.a70a0220.2c38d7.00f3.GAE@google.com> Subject: [moderation/CI] Re: pidfs: add inode ownership and permission checks From: syzbot ci To: syzkaller-upstream-moderation@googlegroups.com Cc: syzbot@lists.linux.dev Content-Type: text/plain; charset="UTF-8" syzbot ci has tested the following series [v1] pidfs: add inode ownership and permission checks https://lore.kernel.org/all/20260216-work-pidfs-inode-owner-v1-1-f8faa6b73983@kernel.org * [PATCH RFC] pidfs: add inode ownership and permission checks and found the following issue: general protection fault in pidfs_fill_owner Full report is available here: https://ci.syzbot.org/series/d1c7b2f5-ccdc-4ca8-af27-dd6c97fd9e90 *** general protection fault in pidfs_fill_owner tree: bpf-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git base: 72c395024dac5e215136cbff793455f065603b06 arch: amd64 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 config: https://ci.syzbot.org/builds/a2c9422a-a065-455a-83e1-f304e9567e3e/config syz repro: https://ci.syzbot.org/findings/b2100115-a69c-42ec-8aa0-29353ad7bd45/syz_repro Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5803 Comm: syz-execprog 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:pidfs_fill_owner+0x1f5/0x500 fs/pidfs.c:743 Code: ff 49 83 c4 20 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 3a f2 da ff 4d 8b 2c 24 49 83 c5 18 4c 89 e8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 7b 02 00 00 41 8b 6d 00 4c 89 f8 48 c1 RSP: 0018:ffffc90004997850 EFLAGS: 00010206 RAX: 0000000000000003 RBX: ffffffff8251bdfe RCX: ffff888175390000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8251bdfe R09: ffffffff8e558220 R10: dffffc0000000000 R11: fffffbfff1fdf4ef R12: ffff8881078adaa0 R13: 0000000000000018 R14: dffffc0000000000 R15: ffff8881169793f8 FS: 000000c00007a898(0000) GS:ffff88818e0d7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c002961200 CR3: 000000016d248000 CR4: 00000000000006f0 Call Trace: pidfs_update_inode fs/pidfs.c:766 [inline] pidfs_stash_dentry+0xf2/0x280 fs/pidfs.c:1073 path_from_stashed+0x463/0x5c0 fs/libfs.c:2258 pidfs_alloc_file+0xff/0x290 fs/pidfs.c:1182 pidfd_prepare+0x14e/0x1b0 kernel/fork.c:1898 copy_process+0x1f3a/0x3cf0 kernel/fork.c:2259 kernel_clone+0x248/0x870 kernel/fork.c:2654 __do_sys_clone kernel/fork.c:2795 [inline] __se_sys_clone kernel/fork.c:2779 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2779 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x4a7d4d Code: 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 41 5c 0f 05 <41> 54 48 3d 01 f0 ff ff 76 12 48 c7 44 24 28 ff ff ff ff 48 f7 d8 RSP: 002b:000000c00001d5b8 EFLAGS: 00000216 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004a7d4d RDX: 000000c00001d644 RSI: 0000000000000000 RDI: 0000000000005100 RBP: 000000c00001d5f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000216 R12: 000000000049fd97 R13: 0000000000000000 R14: 000000c000002380 R15: 000000c000010020 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pidfs_fill_owner+0x1f5/0x500 fs/pidfs.c:743 Code: ff 49 83 c4 20 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 3a f2 da ff 4d 8b 2c 24 49 83 c5 18 4c 89 e8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 7b 02 00 00 41 8b 6d 00 4c 89 f8 48 c1 RSP: 0018:ffffc90004997850 EFLAGS: 00010206 RAX: 0000000000000003 RBX: ffffffff8251bdfe RCX: ffff888175390000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff8251bdfe R09: ffffffff8e558220 R10: dffffc0000000000 R11: fffffbfff1fdf4ef R12: ffff8881078adaa0 R13: 0000000000000018 R14: dffffc0000000000 R15: ffff8881169793f8 FS: 000000c00007a898(0000) GS:ffff88818e0d7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c002961200 CR3: 000000016d248000 CR4: 00000000000006f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 49 83 c4 20 add $0x20,%r12 4: 4c 89 e0 mov %r12,%rax 7: 48 c1 e8 03 shr $0x3,%rax b: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 10: 74 08 je 0x1a 12: 4c 89 e7 mov %r12,%rdi 15: e8 3a f2 da ff call 0xffdaf254 1a: 4d 8b 2c 24 mov (%r12),%r13 1e: 49 83 c5 18 add $0x18,%r13 22: 4c 89 e8 mov %r13,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2e: 84 c0 test %al,%al 30: 0f 85 7b 02 00 00 jne 0x2b1 36: 41 8b 6d 00 mov 0x0(%r13),%ebp 3a: 4c 89 f8 mov %r15,%rax 3d: 48 rex.W 3e: c1 .byte 0xc1 *** 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. The email will later be sent to: [brauner@kernel.org jack@suse.cz jannh@google.com kees@kernel.org linux-fsdevel@vger.kernel.org linux-kernel@vger.kernel.org luto@amacapital.net viro@zeniv.linux.org.uk] If the report looks fine to you, reply with: #syz upstream If the report is a false positive, reply with #syz invalid