memory leak in dev_exception_add

Status: auto-obsoleted due to no activity on 2022/11/02 18:52
Subsystems: lsm usb
[Documentation on labels]
Reported-by: syzbot+988c8a25ad1677559236@syzkaller.appspotmail.com
First crash: 1865d, last: 1865d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] memory leak in dev_exception_add 0 (1) 2021/07/13 18:07
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2022/11/02 04:30 14m retest repro upstream no crash log
2021/08/28 15:23 14m phind.uet@gmail.com linux-next report log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88810d3a4300 (size 64):
  comm "systemd", pid 1, jiffies 4294938536 (age 1351.150s)
  hex dump (first 32 bytes):
    01 00 00 00 03 00 00 00 02 00 07 00 00 00 00 00  ................
    10 04 2b 0d 81 88 ff ff 22 01 00 00 00 00 ad de  ..+.....".......
  backtrace:
    [<ffffffff81479633>] kmemdup+0x23/0x50 mm/util.c:128
    [<ffffffff8217485f>] kmemdup include/linux/fortify-string.h:270 [inline]
    [<ffffffff8217485f>] dev_exception_add+0x2f/0x160 security/device_cgroup.c:94
    [<ffffffff82175812>] devcgroup_update_access security/device_cgroup.c:734 [inline]
    [<ffffffff82175812>] devcgroup_access_write+0x8c2/0x9e0 security/device_cgroup.c:764
    [<ffffffff813198bd>] cgroup_file_write+0x10d/0x260 kernel/cgroup/cgroup.c:3814
    [<ffffffff81690535>] kernfs_fop_write_iter+0x1b5/0x270 fs/kernfs/file.c:296
    [<ffffffff81560eb7>] call_write_iter include/linux/fs.h:2114 [inline]
    [<ffffffff81560eb7>] new_sync_write+0x1d7/0x2b0 fs/read_write.c:518
    [<ffffffff81564531>] vfs_write+0x351/0x400 fs/read_write.c:605
    [<ffffffff8156481d>] ksys_write+0x9d/0x160 fs/read_write.c:658
    [<ffffffff8439b235>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff8439b235>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88810d2b0400 (size 64):
  comm "systemd", pid 1, jiffies 4294938537 (age 1351.140s)
  hex dump (first 32 bytes):
    01 00 00 00 05 00 00 00 02 00 07 00 00 00 00 00  ................
    90 ac 3b 0d 81 88 ff ff 22 01 00 00 00 00 ad de  ..;.....".......
  backtrace:
    [<ffffffff81479633>] kmemdup+0x23/0x50 mm/util.c:128
    [<ffffffff8217485f>] kmemdup include/linux/fortify-string.h:270 [inline]
    [<ffffffff8217485f>] dev_exception_add+0x2f/0x160 security/device_cgroup.c:94
    [<ffffffff82175812>] devcgroup_update_access security/device_cgroup.c:734 [inline]
    [<ffffffff82175812>] devcgroup_access_write+0x8c2/0x9e0 security/device_cgroup.c:764
    [<ffffffff813198bd>] cgroup_file_write+0x10d/0x260 kernel/cgroup/cgroup.c:3814
    [<ffffffff81690535>] kernfs_fop_write_iter+0x1b5/0x270 fs/kernfs/file.c:296
    [<ffffffff81560eb7>] call_write_iter include/linux/fs.h:2114 [inline]
    [<ffffffff81560eb7>] new_sync_write+0x1d7/0x2b0 fs/read_write.c:518
    [<ffffffff81564531>] vfs_write+0x351/0x400 fs/read_write.c:605
    [<ffffffff8156481d>] ksys_write+0x9d/0x160 fs/read_write.c:658
    [<ffffffff8439b235>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff8439b235>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88810d3bac80 (size 64):
  comm "systemd", pid 1, jiffies 4294938537 (age 1351.140s)
  hex dump (first 32 bytes):
    01 00 00 00 07 00 00 00 02 00 07 00 00 00 00 00  ................
    50 84 31 0d 81 88 ff ff 22 01 00 00 00 00 ad de  P.1.....".......
  backtrace:
    [<ffffffff81479633>] kmemdup+0x23/0x50 mm/util.c:128
    [<ffffffff8217485f>] kmemdup include/linux/fortify-string.h:270 [inline]
    [<ffffffff8217485f>] dev_exception_add+0x2f/0x160 security/device_cgroup.c:94
    [<ffffffff82175812>] devcgroup_update_access security/device_cgroup.c:734 [inline]
    [<ffffffff82175812>] devcgroup_access_write+0x8c2/0x9e0 security/device_cgroup.c:764
    [<ffffffff813198bd>] cgroup_file_write+0x10d/0x260 kernel/cgroup/cgroup.c:3814
    [<ffffffff81690535>] kernfs_fop_write_iter+0x1b5/0x270 fs/kernfs/file.c:296
    [<ffffffff81560eb7>] call_write_iter include/linux/fs.h:2114 [inline]
    [<ffffffff81560eb7>] new_sync_write+0x1d7/0x2b0 fs/read_write.c:518
    [<ffffffff81564531>] vfs_write+0x351/0x400 fs/read_write.c:605
    [<ffffffff8156481d>] ksys_write+0x9d/0x160 fs/read_write.c:658
    [<ffffffff8439b235>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff8439b235>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

BUG: memory leak
unreferenced object 0xffff88810d318440 (size 64):
  comm "systemd", pid 1, jiffies 4294938537 (age 1351.140s)
  hex dump (first 32 bytes):
    01 00 00 00 08 00 00 00 02 00 07 00 00 00 00 00  ................
    d0 aa 3b 0d 81 88 ff ff 22 01 00 00 00 00 ad de  ..;.....".......
  backtrace:
    [<ffffffff81479633>] kmemdup+0x23/0x50 mm/util.c:128
    [<ffffffff8217485f>] kmemdup include/linux/fortify-string.h:270 [inline]
    [<ffffffff8217485f>] dev_exception_add+0x2f/0x160 security/device_cgroup.c:94
    [<ffffffff82175812>] devcgroup_update_access security/device_cgroup.c:734 [inline]
    [<ffffffff82175812>] devcgroup_access_write+0x8c2/0x9e0 security/device_cgroup.c:764
    [<ffffffff813198bd>] cgroup_file_write+0x10d/0x260 kernel/cgroup/cgroup.c:3814
    [<ffffffff81690535>] kernfs_fop_write_iter+0x1b5/0x270 fs/kernfs/file.c:296
    [<ffffffff81560eb7>] call_write_iter include/linux/fs.h:2114 [inline]
    [<ffffffff81560eb7>] new_sync_write+0x1d7/0x2b0 fs/read_write.c:518
    [<ffffffff81564531>] vfs_write+0x351/0x400 fs/read_write.c:605
    [<ffffffff8156481d>] ksys_write+0x9d/0x160 fs/read_write.c:658
    [<ffffffff8439b235>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff8439b235>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84400068>] entry_SYSCALL_64_after_hwframe+0x44/0xae

[ 1363.912106][    C1]

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/07/09 18:05 upstream 3dbdb38e2869 281e815f .config console log report syz ci-upstream-gce-leak memory leak in dev_exception_add
* Struck through repros no longer work on HEAD.