Messages in this thread | | | Date | Thu, 05 Jan 2023 08:43:34 -0800 | Subject | [syzbot] [udf?] KASAN: null-ptr-deref Write in udf_fiiter_add_entry | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: c76083fac3ba Add linux-next specific files for 20221226 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=104afeb2480000 kernel config: https://syzkaller.appspot.com/x/.config?x=c217c755f1884ab6 dashboard link: https://syzkaller.appspot.com/bug?extid=b1b66db80fe98b733c58 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=136ca714480000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16fcd5da480000
Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e388f26357fd/disk-c76083fa.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e24f0bae36d5/vmlinux-c76083fa.xz kernel image: https://storage.googleapis.com/syzbot-assets/a5a69a059716/bzImage-c76083fa.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/bb457662f7c3/mount_0.gz
The issue was bisected to:
commit 869e9be21b1c67010d215c83c38b32f6cbd080cc Author: Jan Kara <jack@suse.cz> Date: Tue Dec 20 11:38:45 2022 +0000
udf: Allocate name buffer in directory iterator on heap
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15ce5eb2480000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17ce5eb2480000 console output: https://syzkaller.appspot.com/x/log.txt?x=13ce5eb2480000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b1b66db80fe98b733c58@syzkaller.appspotmail.com Fixes: 869e9be21b1c ("udf: Allocate name buffer in directory iterator on heap")
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcd6a74ea39 RDX: 0000000000000000 RSI: 0000000000141043 RDI: 00000000200000c0 RBP: 00007ffc262fb620 R08: 0000000000000002 R09: 00007ffc262fb630 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffc262fb660 R14: 00007ffc262fb640 R15: 0000000000000008 </TASK> ================================================================== BUG: KASAN: null-ptr-deref in udf_fiiter_add_entry+0x75b/0x10d0 fs/udf/namei.c:316 Write of size 4 at addr 0000000000000000 by task syz-executor153/5085
CPU: 0 PID: 5085 Comm: syz-executor153 Not tainted 6.2.0-rc1-next-20221226-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 kasan_report+0xc0/0xf0 mm/kasan/report.c:517 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x141/0x190 mm/kasan/generic.c:189 memcpy+0x3d/0x60 mm/kasan/shadow.c:66 udf_fiiter_add_entry+0x75b/0x10d0 fs/udf/namei.c:316 udf_add_nondir+0xda/0x360 fs/udf/namei.c:349 udf_create+0x12c/0x180 fs/udf/namei.c:384 lookup_open.isra.0+0xee7/0x1270 fs/namei.c:3413 open_last_lookups fs/namei.c:3481 [inline] path_openat+0x975/0x2a50 fs/namei.c:3711 do_filp_open+0x1ba/0x410 fs/namei.c:3741 do_sys_openat2+0x16d/0x4c0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x11d/0x1c0 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcd6a74ea39 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 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 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc262fb5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fcd6a74ea39 RDX: 0000000000000000 RSI: 0000000000141043 RDI: 00000000200000c0 RBP: 00007ffc262fb620 R08: 0000000000000002 R09: 00007ffc262fb630 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00007ffc262fb660 R14: 00007ffc262fb640 R15: 0000000000000008 </TASK> ==================================================================
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