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Tue, 04 Feb 2025 01:46:28 -0800 (PST) Date: Tue, 04 Feb 2025 01:46:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67a1e1f4.050a0220.163cdc.0063.GAE@google.com> Subject: [syzbot] [hardening?] [mm?] BUG: bad usercopy in vfs_readlink From: syzbot To: akpm@linux-foundation.org, brauner@kernel.org, gustavoars@kernel.org, kees@kernel.org, linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mjguzik@gmail.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B6A3B2000B X-Stat-Signature: s5grfn3i7sjhtysscfxmxtfnxhnacdrf X-HE-Tag: 1738662389-944289 X-HE-Meta: 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 PgXYzy2/ 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 MVY/B7PU Fii7Dlnwx7VsifuxKzAYwLQP5Xw4WbxJVAbtvRe/PzSB/B+gKaPMHM/MM0SbvVpq2OiGgHabhF5kw/9WuW8nkUQh5EQFTDIkCpSwP5cunKcl9wb30ULzl9Tjbi2l/0OTG2ILQn5zaOjkkgrfC0O5zLNAYMOGuweG0BBMCIIWkbazBkpD1dQ4gsBb0jKuFk+8VguqdbKO9Doti1YnX/m1uwLsP9sqyg6RKS0dUtinPHDXkTRen3j4CmcsnLHvpyP6yHqzYkfrQV58WHC8rxKxaHePs2TaDA6D5rObImfCA1OuaQU4SC9ZoekoXiAjnIhWlux0thmjDpVoStxU8g73uCjt27ZsZdMrcPWs4grtMoYKnrAGZMdjdVB0KnQT8oeWk9Vi43lTVPX5tawLoiIwO4mn0fabViMsMzbZ/hLt/mzvCl8MgXuDVg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 69b8923f5003 Merge tag 'for-linus-6.14-ofs4' of git://git... git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=1258aeb0580000 kernel config: https://syzkaller.appspot.com/x/.config?x=57ab43c279fa614d dashboard link: https://syzkaller.appspot.com/bug?extid=48a99e426f29859818c0 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15825724580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1658aeb0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ea84ac864e92/disk-69b8923f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6a465997b4e0/vmlinux-69b8923f.xz kernel image: https://storage.googleapis.com/syzbot-assets/d72b67b2bd15/bzImage-69b8923f.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/7c2919610764/mount_0.gz The issue was bisected to: commit bae80473f7b0b25772619e7692019b1549d4a82c Author: Mateusz Guzik Date: Wed Nov 20 11:20:35 2024 +0000 ext4: use inode_set_cached_link() bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1248c3df980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1148c3df980000 console output: https://syzkaller.appspot.com/x/log.txt?x=1648c3df980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+48a99e426f29859818c0@syzkaller.appspotmail.com Fixes: bae80473f7b0 ("ext4: use inode_set_cached_link()") EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. usercopy: Kernel memory exposure attempt detected from SLUB object 'ext4_inode_cache' (offset 0, size 176)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:102! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 1 UID: 0 PID: 5826 Comm: syz-executor349 Not tainted 6.13.0-syzkaller-09793-g69b8923f5003 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 RIP: 0010:usercopy_abort+0x84/0x90 mm/usercopy.c:102 Code: 49 89 ce 48 c7 c3 80 5f 18 8c 48 0f 44 de 48 c7 c7 20 5e 18 8c 4c 89 de 48 89 c1 41 52 41 56 53 e8 d1 3a f5 fe 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003fa7c90 EFLAGS: 00010296 RAX: 000000000000006b RBX: ffffffff8c185f80 RCX: ba71ae4bd9cf0200 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff819f1fbc R09: 1ffff920007f4f2c R10: dffffc0000000000 R11: fffff520007f4f2d R12: ffffea0001e70200 R13: 00000000000000b0 R14: 0000000000000000 R15: 00000000000000b0 FS: 00005555602a7380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000066c7e0 CR3: 0000000078aac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __check_heap_object+0xb1/0x100 mm/slub.c:5818 check_heap_object mm/usercopy.c:196 [inline] __check_object_size+0x1da/0x730 mm/usercopy.c:251 check_object_size include/linux/thread_info.h:228 [inline] check_copy_size include/linux/thread_info.h:264 [inline] copy_to_user include/linux/uaccess.h:219 [inline] readlink_copy fs/namei.c:5284 [inline] vfs_readlink+0x1cf/0x550 fs/namei.c:5307 do_readlinkat+0x249/0x3a0 fs/stat.c:576 __do_sys_readlinkat fs/stat.c:593 [inline] __se_sys_readlinkat fs/stat.c:590 [inline] __x64_sys_readlinkat+0x9a/0xb0 fs/stat.c:590 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdaffabc639 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 61 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffeb88c4948 EFLAGS: 00000246 ORIG_RAX: 000000000000010b RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007fdaffabc639 RDX: 00000000200002c0 RSI: 0000000020000240 RDI: 00000000ffffff9c RBP: 00007fdaffb30610 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000000b0 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffeb88c4b18 R14: 0000000000000001 R15: 0000000000000001 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:usercopy_abort+0x84/0x90 mm/usercopy.c:102 Code: 49 89 ce 48 c7 c3 80 5f 18 8c 48 0f 44 de 48 c7 c7 20 5e 18 8c 4c 89 de 48 89 c1 41 52 41 56 53 e8 d1 3a f5 fe 48 83 c4 18 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90003fa7c90 EFLAGS: 00010296 RAX: 000000000000006b RBX: ffffffff8c185f80 RCX: ba71ae4bd9cf0200 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff819f1fbc R09: 1ffff920007f4f2c R10: dffffc0000000000 R11: fffff520007f4f2d R12: ffffea0001e70200 R13: 00000000000000b0 R14: 0000000000000000 R15: 00000000000000b0 FS: 00005555602a7380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055dd00353bf8 CR3: 0000000078aac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup