loop5: detected capacity change from 0 to 2048
loop3: detected capacity change from 0 to 40
==================================================================
BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0x493/0x1420
Read of size 4096 at addr ffff888047165000 by task syz-executor.7/4228
CPU: 1 PID: 4228 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: 0033:0x7f4f4d6cdb19
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:00007f4f4ac22188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f4f4d7e1020 RCX: 00007f4f4d6cdb19
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f4f4d727f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffaf410f2f R14: 00007f4f4ac22300 R15: 0000000000022000
Allocated by task 4228:
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 ffff888047164000
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 [ffff888047164000, ffff888047165000)
The buggy address belongs to the physical page:
page:00000000872cc822 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47160
head:00000000872cc822 order:3 compound_mapcount:0 compound_pincount:0
memcg:ffff88800d375a01
flags: 0x100000000010200(slab|head|node=0|zone=1)
raw: 0100000000010200 ffffea000110f200 dead000000000003 ffff88800784c280
raw: 0000000000000000 0000000080040004 00000001ffffffff ffff88800d375a01
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888047164f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888047164f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888047165000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff888047165080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888047165100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
EXT4-fs (loop5): mounted filesystem without journal. Quota mode: none.
EXT4-fs (loop5): unmounting filesystem.
------------[ cut here ]------------
WARNING: CPU: 1 PID: 4228 at lib/iov_iter.c:1026 iov_iter_pipe+0x240/0x2b0
Modules linked in:
CPU: 1 PID: 4228 Comm: syz-executor.7 Tainted: G B 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
RIP: 0010:iov_iter_pipe+0x240/0x2b0
Code: d0 7c 04 84 d2 75 34 44 89 63 24 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e 41 5f e9 2c 80 38 02 e8 a7 e4 3d ff 0f 0b e8 a0 e4 3d ff <0f> 0b e9 a8 fe ff ff e8 74 86 70 ff e9 17 fe ff ff e8 da 86 70 ff
RSP: 0018:ffff8880465779d8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: ffff888046577a68 RCX: ffffc90001bcf000
RDX: 0000000000040000 RSI: ffffffff8207ba20 RDI: 0000000000000004
RBP: ffff8880180a9c00 R08: 0000000000000004 R09: 0000000000000010
R10: 0000000000000010 R11: 0000000000000001 R12: 0000000000000010
R13: 0000000000000000 R14: 0000000000000010 R15: 0000000000000010
FS: 00007f4f4ac22700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562dbdc747e8 CR3: 0000000045d40000 CR4: 0000000000350ee0
Call Trace:
generic_file_splice_read+0x95/0x4d0
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: 0033:0x7f4f4d6cdb19
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:00007f4f4ac22188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f4f4d7e1020 RCX: 00007f4f4d6cdb19
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f4f4d727f6d R08: 0000000000000000 R09: 0000000000000000
R10: 000000010000027f R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffaf410f2f R14: 00007f4f4ac22300 R15: 0000000000022000
irq event stamp: 1581
hardirqs last enabled at (1581): [] asm_sysvec_call_function_single+0x16/0x20
hardirqs last disabled at (1580): [] __do_softirq+0x6be/0x8d0
softirqs last enabled at (1398): [] __irq_exit_rcu+0x11b/0x180
softirqs last disabled at (1393): [] __irq_exit_rcu+0x11b/0x180
---[ end trace 0000000000000000 ]---
syz-executor.4 (4183) used greatest stack depth: 23384 bytes left
audit: type=1400 audit(1658088799.991:10): avc: denied { block_suspend } for pid=4244 comm="syz-executor.5" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
loop3: detected capacity change from 0 to 222