audit: type=1326 audit(1658136147.460:10): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=3792 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f9669abbb19 code=0x0 hrtimer: interrupt took 27842 ns ================================================================== BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x493/0x1420 Read of size 4096 at addr ffff888018019000 by task syz-executor.7/3842 CPU: 1 PID: 3842 Comm: syz-executor.7 Not tainted 5.19.0-rc6-next-20220715 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 print_report.cold+0x5e/0x5e5 kasan_report+0xb1/0x1c0 kasan_check_range+0x35/0x1c0 memcpy+0x20/0x60 _copy_to_iter+0x493/0x1420 seq_read_iter+0xdcb/0x12b0 proc_reg_read_iter+0x20a/0x2e0 generic_file_splice_read+0x187/0x4d0 do_splice_to+0x1bc/0x240 splice_direct_to_actor+0x2ac/0x8c0 do_splice_direct+0x1b8/0x290 do_sendfile+0xb1d/0x1280 __x64_sys_sendfile64+0x1d1/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc26248bb19 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:00007fc25f9e0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fc26259f020 RCX: 00007fc26248bb19 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000007 RBP: 00007fc2624e5f6d R08: 0000000000000000 R09: 0000000000000000 R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5ea8a5af R14: 00007fc25f9e0300 R15: 0000000000022000 Allocated by task 3842: kasan_save_stack+0x1e/0x40 __kasan_kmalloc+0x81/0xa0 kvmalloc_node+0x41/0x1e0 seq_read_iter+0x81c/0x12b0 proc_reg_read_iter+0x20a/0x2e0 generic_file_splice_read+0x187/0x4d0 do_splice_to+0x1bc/0x240 splice_direct_to_actor+0x2ac/0x8c0 do_splice_direct+0x1b8/0x290 do_sendfile+0xb1d/0x1280 __x64_sys_sendfile64+0x1d1/0x210 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888018018000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 0 bytes to the right of 4096-byte region [ffff888018018000, ffff888018019000) The buggy address belongs to the physical page: page:00000000e6721c3d refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801801e000 pfn:0x18018 head:00000000e6721c3d order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88800ce0b8c1 flags: 0x100000000010200(slab|head|node=0|zone=1) raw: 0100000000010200 0000000000000000 dead000000000001 ffff88800784c280 raw: ffff88801801e000 0000000080040003 00000001ffffffff ffff88800ce0b8c1 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888018018f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888018018f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888018019000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888018019080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888018019100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready loop2: detected capacity change from 0 to 32 wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready