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

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Message-ID: <00000000000017b74d06099f1375@google.com>
Date:   Tue, 07 Nov 2023 23:31:24 -0800
From:   syzbot <syzbot+2a478080bd86d36bb5ea@...kaller.appspotmail.com>
To:     johan.hedberg@...il.com, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, luiz.dentz@...il.com,
        marcel@...tmann.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bluetooth?] memory leak in prepare_creds (4)

syzbot has found a reproducer for the following issue on:

HEAD commit:    13d88ac54ddd Merge tag 'vfs-6.7.fsid' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10740c7b680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ecfdf78a410c834
dashboard link: https://syzkaller.appspot.com/bug?extid=2a478080bd86d36bb5ea
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=12d8fd7f680000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=107b137f680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/9bb27a01f17c/disk-13d88ac5.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fb496feed171/vmlinux-13d88ac5.xz
kernel image: https://storage.googleapis.com/syzbot-assets/f4da22719ffa/bzImage-13d88ac5.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2a478080bd86d36bb5ea@...kaller.appspotmail.com

Warning: Permanently added '10.128.0.113' (ED25519) to the list of known hosts.
executing program
executing program
BUG: memory leak
unreferenced object 0xffff888107c20600 (size 192):
  comm "syz-executor418", pid 5027, jiffies 4294942544 (age 13.100s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81630798>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]
    [<ffffffff81630798>] slab_post_alloc_hook mm/slab.h:766 [inline]
    [<ffffffff81630798>] slab_alloc_node mm/slub.c:3478 [inline]
    [<ffffffff81630798>] slab_alloc mm/slub.c:3486 [inline]
    [<ffffffff81630798>] __kmem_cache_alloc_lru mm/slub.c:3493 [inline]
    [<ffffffff81630798>] kmem_cache_alloc+0x298/0x430 mm/slub.c:3502
    [<ffffffff812e0d5b>] prepare_creds+0x2b/0x4e0 kernel/cred.c:269
    [<ffffffff812e17c4>] copy_creds+0x44/0x280 kernel/cred.c:373
    [<ffffffff812927ba>] copy_process+0x6aa/0x25c0 kernel/fork.c:2366
    [<ffffffff8129487b>] kernel_clone+0x11b/0x690 kernel/fork.c:2907
    [<ffffffff81294e6c>] __do_sys_clone+0x7c/0xb0 kernel/fork.c:3050
    [<ffffffff84b67d8f>] do_syscall_x64 arch/x86/entry/common.c:51 [inline]
    [<ffffffff84b67d8f>] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0x6b

BUG: memory leak
unreferenced object 0xffff888107470a80 (size 16):
  comm "syz-executor418", pid 5027, jiffies 4294942544 (age 13.100s)
  hex dump (first 16 bytes):
    00 00 00 00 00 00 00 00 00 c3 87 00 81 88 ff ff  ................
  backtrace:
    [<ffffffff8163331d>] kmemleak_alloc_recursive include/linux/kmemleak.h:42 [inline]
    [<ffffffff8163331d>] slab_post_alloc_hook mm/slab.h:766 [inline]
    [<ffffffff8163331d>] slab_alloc_node mm/slub.c:3478 [inline]
    [<ffffffff8163331d>] __kmem_cache_alloc_node+0x2dd/0x3f0 mm/slub.c:3517
    [<ffffffff8157e81b>] __do_kmalloc_node mm/slab_common.c:1006 [inline]
    [<ffffffff8157e81b>] __kmalloc+0x4b/0x150 mm/slab_common.c:1020
    [<ffffffff82364631>] kmalloc include/linux/slab.h:604 [inline]
    [<ffffffff82364631>] kzalloc include/linux/slab.h:721 [inline]
    [<ffffffff82364631>] lsm_cred_alloc security/security.c:577 [inline]
    [<ffffffff82364631>] security_prepare_creds+0x121/0x140 security/security.c:2950
    [<ffffffff812e1059>] prepare_creds+0x329/0x4e0 kernel/cred.c:300
    [<ffffffff812e17c4>] copy_creds+0x44/0x280 kernel/cred.c:373
    [<ffffffff812927ba>] copy_process+0x6aa/0x25c0 kernel/fork.c:2366
    [<ffffffff8129487b>] kernel_clone+0x11b/0x690 kernel/fork.c:2907
    [<ffffffff81294e6c>] __do_sys_clone+0x7c/0xb0 kernel/fork.c:3050
    [<ffffffff84b67d8f>] do_syscall_x64 arch/x86/entry/common.c:51 [inline]
    [<ffffffff84b67d8f>] do_syscall_64+0x3f/0x110 arch/x86/entry/common.c:82
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0x6b



---
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.