linux-kernel - Re: [syzbot] [kernel?] memory leak in binder

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Date:   Mon, 11 Sep 2023 13:56:34 -0700
From:   syzbot <syzbot+7f10c1653e35933c0f1e@...kaller.appspotmail.com>
To:     arve@...roid.com, brauner@...nel.org, cmllamas@...gle.com,
        gregkh@...uxfoundation.org, hdanton@...a.com,
        joel@...lfernandes.org, linux-kernel@...r.kernel.org,
        maco@...roid.com, surenb@...gle.com,
        syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: Re: [syzbot] [kernel?] memory leak in binder_transaction (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    0bb80ecc33a8 Linux 6.6-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=177ee3c8680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=99ce3535087fc27
dashboard link: https://syzkaller.appspot.com/bug?extid=7f10c1653e35933c0f1e
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=107b832c680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=147332b4680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/ce21ae500663/disk-0bb80ecc.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/1d2f34908198/vmlinux-0bb80ecc.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9c6f5eecda20/bzImage-0bb80ecc.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+7f10c1653e35933c0f1e@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810e2d6de0 (size 32):
  comm "syz-executor338", pid 5046, jiffies 4294968230 (age 13.590s)
  hex dump (first 32 bytes):
    e0 6d 2d 0e 81 88 ff ff e0 6d 2d 0e 81 88 ff ff  .m-......m-.....
    04 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81573b75>] kmalloc_trace+0x25/0x90 mm/slab_common.c:1114
    [<ffffffff83d41873>] kmalloc include/linux/slab.h:599 [inline]
    [<ffffffff83d41873>] kzalloc include/linux/slab.h:720 [inline]
    [<ffffffff83d41873>] binder_transaction+0x573/0x4050 drivers/android/binder.c:3152
    [<ffffffff83d45a05>] binder_thread_write+0x6b5/0x1860 drivers/android/binder.c:4010
    [<ffffffff83d486dc>] binder_ioctl_write_read drivers/android/binder.c:5066 [inline]
    [<ffffffff83d486dc>] binder_ioctl+0x1b2c/0x3cf0 drivers/android/binder.c:5352
    [<ffffffff816b25f2>] vfs_ioctl fs/ioctl.c:51 [inline]
    [<ffffffff816b25f2>] __do_sys_ioctl fs/ioctl.c:871 [inline]
    [<ffffffff816b25f2>] __se_sys_ioctl fs/ioctl.c:857 [inline]
    [<ffffffff816b25f2>] __x64_sys_ioctl+0xf2/0x140 fs/ioctl.c:857
    [<ffffffff84b30008>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84b30008>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory
write to /proc/sys/kernel/hung_task_check_interval_secs failed: No such file or directory
write to /proc/sys/kernel/softlockup_all_cpu_backtrace failed: No such file or directory


---
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.