Messages in this thread | | | Date | Sat, 05 May 2018 08:47:02 -0700 | Subject | KASAN: null-ptr-deref Write in simple_write_to_buffer | From | syzbot <> |
| |
Hello,
syzbot found the following crash on:
HEAD commit: c1c07416cdd4 Merge tag 'kbuild-fixes-v4.17' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17912237800000 kernel config: https://syzkaller.appspot.com/x/.config?x=5a1dc06635c10d27 dashboard link: https://syzkaller.appspot.com/bug?extid=ae590932da6e45d6564d compiler: gcc (GCC) 8.0.1 20180413 (experimental) syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=108c8e07800000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=142f907b800000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+ae590932da6e45d6564d@syzkaller.appspotmail.com
random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) random: sshd: uninitialized urandom read (32 bytes read) Restarting kernel threads ... done. ================================================================== BUG: KASAN: null-ptr-deref in _copy_from_user+0x100/0x150 lib/usercopy.c:12 Write of size 32 at addr 0000000000000020 by task syz-executor101/4498
CPU: 1 PID: 4498 Comm: syz-executor101 Not tainted 4.17.0-rc3+ #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 kasan_report_error mm/kasan/report.c:352 [inline] kasan_report.cold.7+0x6d/0x2fe mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278 _copy_from_user+0x100/0x150 lib/usercopy.c:12 copy_from_user include/linux/uaccess.h:147 [inline] simple_write_to_buffer+0xaf/0x130 fs/libfs.c:669 snapshot_write+0x16d/0x270 kernel/power/user.c:189 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4455a9 RSP: 002b:00007f973a88ada8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 00000000004455a9 RDX: 0000000000000020 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dac20 R13: 616e732f7665642f R14: 00007f973a88b9c0 R15: 0000000000000003 ==================================================================
--- This bug 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 bug report. If you forgot to add the Reported-by tag, once the fix for this bug is merged into any tree, please reply to this email with: #syz fix: exact-commit-title If you want to test a patch for this bug, please reply with: #syz test: git://repo/address.git branch and provide the patch inline or as an attachment. To mark this as a duplicate of another syzbot report, please reply with: #syz dup: exact-subject-of-another-report If it's a one-off invalid bug report, please reply with: #syz invalid Note: if the crash happens again, it will cause creation of a new bug report. Note: all commands must start from beginning of the line in the email body.
| |