KMSAN: uninit-value in skb

KMSAN: uninit-value in skb_trim
Status: upstream: reported on 2020/08/24 13:58
Reported-by: syzbot+e4534e8c1c382508312c@syzkaller.appspotmail.com
First crash: 39d, last: 33d

Sample crash report:

=====================================================
BUG: KMSAN: uninit-value in skb_trim+0x1f2/0x280 net/core/skbuff.c:1916
CPU: 1 PID: 4863 Comm: systemd-udevd Not tainted 5.8.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:121
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 skb_trim+0x1f2/0x280 net/core/skbuff.c:1916
 ath9k_htc_rx_msg+0x5f6/0x1f50 drivers/net/wireless/ath/ath9k/htc_hst.c:453
 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:638 [inline]
 ath9k_hif_usb_rx_cb+0x1841/0x1d10 drivers/net/wireless/ath/ath9k/hif_usb.c:671
 __usb_hcd_giveback_urb+0x687/0x870 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1716
 dummy_timer+0xd98/0x71c0 drivers/usb/gadget/udc/dummy_hcd.c:1967
 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404
 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449
 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
 do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:390 [inline]
 __irq_exit_rcu+0x226/0x270 kernel/softirq.c:420
 irq_exit_rcu+0xe/0x10 kernel/softirq.c:432
 sysvec_apic_timer_interrupt+0x107/0x130 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:593
RIP: 0010:kmsan_get_metadata+0x29/0x180 mm/kmsan/kmsan_shadow.c:186
Code: 00 55 48 89 e5 41 57 41 56 53 41 89 d6 48 89 fb 48 83 e3 fc 85 d2 48 0f 44 df 40 f6 c7 03 48 0f 44 df 48 89 df e8 77 e1 ff ff <84> c0 75 0c 48 89 df e8 9b e1 ff ff 84 c0 74 67 f6 c3 03 74 09 45
RSP: 0018:ffff88811594b7b0 EFLAGS: 00000246
RAX: ffffd0ffffffff00 RBX: ffff88810b187d39 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88810b187d39
RBP: ffff88811594b7c8 R08: ffffffff854bc4f0 R09: ffff88812fffa000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff88811a0d46d8 R14: 0000000000000000 R15: 0000000000000000
 kmsan_get_shadow_origin_ptr+0x6c/0xb0 mm/kmsan/kmsan_shadow.c:149
 __msan_metadata_ptr_for_load_1+0x10/0x20 mm/kmsan/kmsan_instr.c:52
 tomoyo_domain_quota_is_ok+0x1ef/0x950 security/tomoyo/util.c:1039
 tomoyo_supervisor+0x756/0x2840 security/tomoyo/common.c:2089
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_perm+0x933/0xc60 security/tomoyo/file.c:838
 tomoyo_inode_getattr+0x54/0x60 security/tomoyo/tomoyo.c:123
 security_inode_getattr+0x144/0x280 security/security.c:1278
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx_fd fs/stat.c:151 [inline]
 vfs_fstat include/linux/fs.h:3313 [inline]
 __do_sys_newfstat fs/stat.c:398 [inline]
 __se_sys_newfstat+0x11c/0xaf0 fs/stat.c:395
 __x64_sys_newfstat+0x3e/0x60 fs/stat.c:395
 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7fa86a4562e2
Code: Bad RIP value.
RSP: 002b:00007ffc6d1760f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000005
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa86a4562e2
RDX: 00007ffc6d176110 RSI: 00007ffc6d176110 RDI: 000000000000000e
RBP: 00007ffc6d1762b0 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000080000 R11: 0000000000000246 R12: 0000558f6204e130
R13: 0000558f6204a010 R14: 0000558f6204f610 R15: 00007ffc6d176270

Uninit was created at:
 kmsan_save_stack_with_flags+0x3c/0x90 mm/kmsan/kmsan.c:144
 kmsan_internal_alloc_meta_for_pages mm/kmsan/kmsan_shadow.c:269 [inline]
 kmsan_alloc_page+0xc5/0x1a0 mm/kmsan/kmsan_shadow.c:293
 __alloc_pages_nodemask+0xdf0/0x1030 mm/page_alloc.c:4889
 __alloc_pages include/linux/gfp.h:509 [inline]
 __alloc_pages_node include/linux/gfp.h:522 [inline]
 alloc_pages_node include/linux/gfp.h:536 [inline]
 __page_frag_cache_refill mm/page_alloc.c:4964 [inline]
 page_frag_alloc+0x35b/0x880 mm/page_alloc.c:4994
 __netdev_alloc_skb+0x2a8/0xc90 net/core/skbuff.c:451
 __dev_alloc_skb include/linux/skbuff.h:2813 [inline]
 ath9k_hif_usb_rx_stream drivers/net/wireless/ath/ath9k/hif_usb.c:620 [inline]
 ath9k_hif_usb_rx_cb+0xe5a/0x1d10 drivers/net/wireless/ath/ath9k/hif_usb.c:671
 __usb_hcd_giveback_urb+0x687/0x870 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x1cb/0x730 drivers/usb/core/hcd.c:1716
 dummy_timer+0xd98/0x71c0 drivers/usb/gadget/udc/dummy_hcd.c:1967
 call_timer_fn+0x226/0x550 kernel/time/timer.c:1404
 expire_timers+0x4fc/0x780 kernel/time/timer.c:1449
 __run_timers+0xaf4/0xd30 kernel/time/timer.c:1773
 run_timer_softirq+0x2d/0x50 kernel/time/timer.c:1786
 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:293
=====================================================

Crashes (5):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kmsan-gce	2020/08/26 22:44	https://github.com/google/kmsan.git master	ce8056d1	318430cb	.config	log	report	ath9k-devel@qca.qualcomm.com, davem@davemloft.net, kuba@kernel.org, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kmsan-gce	2020/08/23 17:11	https://github.com/google/kmsan.git master	ce8056d1	cef5ae68	.config	log	report	ath9k-devel@qca.qualcomm.com, davem@davemloft.net, kuba@kernel.org, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kmsan-gce	2020/08/20 13:38	https://github.com/google/kmsan.git master	ce8056d1	ed282a3a	.config	log	report	ath9k-devel@qca.qualcomm.com, davem@davemloft.net, kuba@kernel.org, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kmsan-gce-386	2020/08/26 22:46	https://github.com/google/kmsan.git master	ce8056d1	318430cb	.config	log	report	ath9k-devel@qca.qualcomm.com, davem@davemloft.net, kuba@kernel.org, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kmsan-gce-386	2020/08/20 14:09	https://github.com/google/kmsan.git master	ce8056d1	ed282a3a	.config	log	report	ath9k-devel@qca.qualcomm.com, davem@davemloft.net, kuba@kernel.org, kvalo@codeaurora.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org