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Message-ID: <CACT4Y+a_XTt=8HsRCvzzW7TEN066BcB=Lh10-o6wvvrSYb0haA@mail.gmail.com>
Date: Fri, 19 Mar 2021 07:17:09 +0100
From: Dmitry Vyukov <dvyukov@...gle.com>
To: Hillf Danton <hdanton@...a.com>
Cc: syzbot <syzbot+6e23e12624dbacf657bc@...kaller.appspotmail.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
LKML <linux-kernel@...r.kernel.org>,
"Luis R. Rodriguez" <mcgrof@...nel.org>,
Rafael Wysocki <rafael@...nel.org>,
syzkaller-bugs <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] KASAN: use-after-free Read in kill_pending_fw_fallback_reqs
On Fri, Mar 19, 2021 at 7:08 AM Hillf Danton <hdanton@...a.com> wrote:
>
> On Thu, 18 Mar 2021 08:10:19 -0700
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit: 6417f031 module: remove never implemented MODULE_SUPPORTED..
> > git tree: upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=16293a7cd00000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=ab2c8a4eaedddecd
> > dashboard link: https://syzkaller.appspot.com/bug?extid=6e23e12624dbacf657bc
> >
> > Unfortunately, I don't have any reproducer for this issue yet.
>
> Looks like the same cause as
> Reported-by: syzbot+de271708674e2093097b@...kaller.appspotmail.com
Hi Hillf,
Let's tell syzbot about this then:
#syz dup: KASAN: use-after-free Read in firmware_fallback_sysfs
Please see http://bit.do/syzbot#communication-with-syzbot for details
on communicating with syzbot.
(and please don't CC more than 1 syzbot+HASH emails, it may cause
havoc, syzbot won't be able to figure out what bug people are talking
about).
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+6e23e12624dbacf657bc@...kaller.appspotmail.com
> >
> > ==================================================================
> > BUG: KASAN: use-after-free in kill_pending_fw_fallback_reqs+0x2fb/0x370 drivers/base/firmware_loader/fallback.c:116
> > Read of size 8 at addr ffff8880757caac0 by task syz-executor.1/14981
> >
> > CPU: 0 PID: 14981 Comm: syz-executor.1 Not tainted 5.12.0-rc3-syzkaller #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> > Call Trace:
> > __dump_stack lib/dump_stack.c:79 [inline]
> > dump_stack+0x141/0x1d7 lib/dump_stack.c:120
> > print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232
> > __kasan_report mm/kasan/report.c:399 [inline]
> > kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416
> > kill_pending_fw_fallback_reqs+0x2fb/0x370 drivers/base/firmware_loader/fallback.c:116
> > fw_pm_notify+0xa2/0x150 drivers/base/firmware_loader/main.c:1448
> > notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
> > notifier_call_chain_robust kernel/notifier.c:118 [inline]
> > blocking_notifier_call_chain_robust kernel/notifier.c:302 [inline]
> > blocking_notifier_call_chain_robust+0xc4/0x160 kernel/notifier.c:290
> > pm_notifier_call_chain_robust+0x26/0x60 kernel/power/main.c:87
> > snapshot_open+0x190/0x2a0 kernel/power/user.c:75
> > misc_open+0x372/0x4a0 drivers/char/misc.c:141
> > chrdev_open+0x266/0x770 fs/char_dev.c:414
> > do_dentry_open+0x4b9/0x11b0 fs/open.c:826
> > do_open fs/namei.c:3365 [inline]
> > path_openat+0x1c0e/0x27e0 fs/namei.c:3498
> > do_filp_open+0x17e/0x3c0 fs/namei.c:3525
> > do_sys_openat2+0x16d/0x420 fs/open.c:1187
> > do_sys_open fs/open.c:1203 [inline]
> > __do_sys_openat fs/open.c:1219 [inline]
> > __se_sys_openat fs/open.c:1214 [inline]
> > __x64_sys_openat+0x13f/0x1f0 fs/open.c:1214
> > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> > entry_SYSCALL_64_after_hwframe+0x44/0xae
> > RIP: 0033:0x465f69
> > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48
> > RSP: 002b:00007f9819e12188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
> > RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69
> > RDX: 0000000000000000 RSI: 0000000020000ac0 RDI: ffffffffffffff9c
> > RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000
> > R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
> > R13: 00007ffd557c11df R14: 00007f9819e12300 R15: 0000000000022000
> >
> > Allocated by task 13418:
> > kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
> > kasan_set_track mm/kasan/common.c:46 [inline]
> > set_alloc_info mm/kasan/common.c:427 [inline]
> > ____kasan_kmalloc mm/kasan/common.c:506 [inline]
> > ____kasan_kmalloc mm/kasan/common.c:465 [inline]
> > __kasan_kmalloc+0x99/0xc0 mm/kasan/common.c:515
> > kmalloc include/linux/slab.h:554 [inline]
> > kzalloc include/linux/slab.h:684 [inline]
> > __allocate_fw_priv drivers/base/firmware_loader/main.c:186 [inline]
> > alloc_lookup_fw_priv drivers/base/firmware_loader/main.c:250 [inline]
> > _request_firmware_prepare drivers/base/firmware_loader/main.c:744 [inline]
> > _request_firmware+0x2de/0xe80 drivers/base/firmware_loader/main.c:806
> > request_firmware+0x32/0x50 drivers/base/firmware_loader/main.c:875
> > reg_reload_regdb+0x7a/0x240 net/wireless/reg.c:1095
> > genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
> > genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
> > genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
> > netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502
> > genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
> > netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
> > netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
> > netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
> > sock_sendmsg_nosec net/socket.c:654 [inline]
> > sock_sendmsg+0xcf/0x120 net/socket.c:674
> > ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
> > ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
> > __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
> > do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
> > entry_SYSCALL_64_after_hwframe+0x44/0xae
> >
> > The buggy address belongs to the object at ffff8880757caa00
> > which belongs to the cache kmalloc-256 of size 256
> > The buggy address is located 192 bytes inside of
> > 256-byte region [ffff8880757caa00, ffff8880757cab00)
> > The buggy address belongs to the page:
> > page:ffffea0001d5f280 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880757caa00 pfn:0x757ca
> > head:ffffea0001d5f280 order:1 compound_mapcount:0
> > flags: 0xfff00000010200(slab|head)
> > raw: 00fff00000010200 ffffea000094b608 ffffea00006b8508 ffff888010841b40
> > raw: ffff8880757caa00 0000000000100005 00000001ffffffff 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> > ffff8880757ca980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8880757caa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > >ffff8880757caa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> > ^
> > ffff8880757cab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8880757cab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ==================================================================
> >
> >
> > ---
> > This report 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@...glegroups.com.
> >
> > syzbot will keep track of this issue. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> >
>
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