Hello, syzbot found the following issue on: HEAD commit: ce8056d1 wip: changed copy_from_user where instrumented git tree: https://github.com/google/kmsan.git master console output: https://syzkaller.appspot.com/x/log.txt?x=130c562c900000 kernel config: https://syzkaller.appspot.com/x/.config?x=3afe005fb99591f dashboard link: https://syzkaller.appspot.com/bug?extid=2ca247c2d60c7023de7f compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) userspace arch: i386 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+2ca247c2d60c7023de7f@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================================== BUG: KMSAN: uninit-value in ath9k_htc_rx_msg+0x28f/0x1f50 drivers/net/wireless/ath/ath9k/htc_hst.c:410 CPU: 0 PID: 4867 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 ath9k_htc_rx_msg+0x28f/0x1f50 drivers/net/wireless/ath/ath9k/htc_hst.c:410 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:tomoyo_path_matches_pattern+0xba/0x4d0 security/tomoyo/util.c:920 Code: 48 89 45 a0 8b 02 89 45 d0 4d 85 f6 4c 8b ad 70 ff ff ff 0f 85 c6 01 00 00 4c 89 7d b8 41 0f b7 44 24 0c 48 89 45 80 48 89 df <e8> 71 fd ea fc 49 8d 5c 24 0f 0f b7 00 48 89 45 88 8b 02 89 45 a8 RSP: 0018:ffff888111c0f858 EFLAGS: 00000246 RAX: 0000000000000015 RBX: ffff888111d41fe4 RCX: 0000000111941fd8 RDX: ffff888111941fd8 RSI: 0000000000000440 RDI: ffff888111d41fe4 RBP: ffff888111c0f8e8 R08: ffffea000000000f R09: ffff88812fffa000 R10: 0000000000000003 R11: ffff88811a320000 R12: ffff888111d41fd8 R13: ffff88811a3209d8 R14: 0000000000000000 R15: ffff888111c0fab0 tomoyo_compare_name_union security/tomoyo/file.c:87 [inline] tomoyo_check_path_acl+0x272/0x360 security/tomoyo/file.c:260 tomoyo_check_acl+0x239/0x5a0 security/tomoyo/domain.c:175 tomoyo_path_permission security/tomoyo/file.c:586 [inline] tomoyo_path_perm+0x83f/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+0x34c/0x940 fs/stat.c:206 vfs_lstat include/linux/fs.h:3302 [inline] __do_sys_newlstat fs/stat.c:374 [inline] __se_sys_newlstat+0xce/0x920 fs/stat.c:368 __x64_sys_newlstat+0x3e/0x60 fs/stat.c:368 do_syscall_64+0xad/0x160 arch/x86/entry/common.c:386 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f72dd774335 Code: Bad RIP value. RSP: 002b:00007ffeb28263b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 000055a2c06613f0 RCX: 00007f72dd774335 RDX: 00007ffeb28263f0 RSI: 00007ffeb28263f0 RDI: 000055a2c06603f0 RBP: 00007ffeb28264b0 R08: 00007f72dda33178 R09: 0000000000001010 R10: 0000000000000020 R11: 0000000000000246 R12: 000055a2c06603f0 R13: 000055a2c0660410 R14: 000055a2c064ce5b R15: 000055a2c064ce60 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 ===================================================== --- This report is generated by a bot. 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