syzbot


KASAN: slab-out-of-bounds Read in riscv_intc_irq (2)

Status: moderation: reported on 2022/10/29 23:04
Reported-by: syzbot+70d5d5d83d03db2c813d@syzkaller.appspotmail.com
First crash: 102d, last: 46d
similar bugs (1):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: slab-out-of-bounds Read in riscv_intc_irq 1 693d 693d 0/24 auto-closed as invalid on 2021/07/12 08:18

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in riscv_intc_irq+0x24/0xc8 drivers/irqchip/irq-riscv-intc.c:24
Read of size 8 at addr ffffaf800ee1ff90 by task syz-executor.1/2060

CPU: 0 PID: 2060 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffff8000a228>] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:113
[<ffffffff831668cc>] show_stack+0x34/0x40 arch/riscv/kernel/stacktrace.c:119
[<ffffffff831756ba>] __dump_stack lib/dump_stack.c:88 [inline]
[<ffffffff831756ba>] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:106
[<ffffffff8047479e>] print_address_description.constprop.0+0x2a/0x330 mm/kasan/report.c:255
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff80c43cf8>] riscv_intc_irq+0x24/0xc8 drivers/irqchip/irq-riscv-intc.c:24
[<ffffffff831a1a1a>] generic_handle_arch_irq+0x36/0x54 kernel/irq/handle.c:238
[<ffffffff80005724>] ret_from_exception+0x0/0x10
[<ffffffff831a24b0>] check_preemption_disabled+0x3a/0x192 lib/smp_processor_id.c:16

Allocated by task 16777215:
(stack is not available)

Freed by task 2072:
 stack_trace_save+0xa6/0xd8 kernel/stacktrace.c:122
 kasan_save_stack+0x2c/0x58 mm/kasan/common.c:38
 kasan_set_track+0x1a/0x26 mm/kasan/common.c:45
 kasan_set_free_info+0x1e/0x3a mm/kasan/generic.c:370
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free+0x15e/0x180 mm/kasan/common.c:328
 __kasan_slab_free+0x10/0x18 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:236 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0x8e/0x1cc mm/slub.c:1754
 slab_free mm/slub.c:3509 [inline]
 kfree+0xe0/0x3e4 mm/slub.c:4562
 tomoyo_realpath_from_path+0x158/0x3f4 security/tomoyo/realpath.c:291
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_path_perm+0x1fc/0x3a8 security/tomoyo/file.c:822
 tomoyo_inode_getattr+0x1e/0x28 security/tomoyo/tomoyo.c:122
 security_inode_getattr+0x82/0xc6 security/security.c:1326
 vfs_getattr fs/stat.c:157 [inline]
 vfs_fstat+0x54/0xc8 fs/stat.c:182
 __do_sys_newfstat+0x96/0x106 fs/stat.c:422
 sys_newfstat+0x22/0x2e fs/stat.c:419
 ret_from_syscall+0x0/0x2

Last potentially related work creation:
------------[ cut here ]------------
slab index 1506808 out of bounds (294) for stack id 8456fdf8
WARNING: CPU: 0 PID: 2060 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline]
WARNING: CPU: 0 PID: 2060 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276
Modules linked in:
CPU: 0 PID: 2060 Comm: syz-executor.1 Not tainted 5.17.0-rc1-syzkaller-00002-g0966d385830d #0
Hardware name: riscv-virtio,qemu (DT)
epc : stack_depot_fetch lib/stackdepot.c:304 [inline]
epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276
 ra : stack_depot_fetch lib/stackdepot.c:304 [inline]
 ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276
epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800ee1fd60
 gp : ffffffff85863ac0 tp : ffffaf800e6d9840 t0 : ffffffff86bcb657
 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800ee1fd70
 s1 : ffffaf807aa786c0 a0 : 000000000000003c a1 : 00000000000f0000
 a2 : 0000000000010506 a3 : ffffffff8012252a a4 : 93721f8c2c1ff900
 a5 : 93721f8c2c1ff900 a6 : 0000000000f00000 a7 : ffffaf805a9c8863
 s2 : ffffaf800ee1ff90 s3 : ffffaf8007202140 s4 : ffffaf800ee1e000
 s5 : ffffaf800ee1f000 s6 : 0000000000003fff s7 : 8000000000000009
 s8 : ffffffff85889780 s9 : 1ffff5f001dc400c s10: ffffffff84b73e00
 s11: ffffffff80256d34 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c
 t5 : fffff5ef0b53910d t6 : ffffaf800ee1f858
status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003
[<ffffffff80474a70>] describe_object_stacks mm/kasan/report.c:216 [inline]
[<ffffffff80474a70>] describe_object mm/kasan/report.c:231 [inline]
[<ffffffff80474a70>] print_address_description.constprop.0+0x2fc/0x330 mm/kasan/report.c:263
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff80c43cf8>] riscv_intc_irq+0x24/0xc8 drivers/irqchip/irq-riscv-intc.c:24
[<ffffffff831a1a1a>] generic_handle_arch_irq+0x36/0x54 kernel/irq/handle.c:238
[<ffffffff80005724>] ret_from_exception+0x0/0x10
[<ffffffff831a24b0>] check_preemption_disabled+0x3a/0x192 lib/smp_processor_id.c:16
irq event stamp: 52003
hardirqs last  enabled at (52002): [<ffffffff831afd54>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (52002): [<ffffffff831afd54>] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194
hardirqs last disabled at (52003): [<ffffffff8000e866>] __trace_hardirqs_off+0x18/0x20 arch/riscv/kernel/trace_irq.c:25
softirqs last  enabled at (51826): [<ffffffff831b0bd0>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (51826): [<ffffffff831b0bd0>] __do_softirq+0x618/0x8fc kernel/softirq.c:587
softirqs last disabled at (51831): [<ffffffff80061288>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (51831): [<ffffffff80061288>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (51831): [<ffffffff80061288>] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637
---[ end trace 0000000000000000 ]---

Second to last potentially related work creation:
------------[ cut here ]------------
slab index 2097151 out of bounds (294) for stack id ffffffff
WARNING: CPU: 0 PID: 2060 at lib/stackdepot.c:304 stack_depot_fetch lib/stackdepot.c:304 [inline]
WARNING: CPU: 0 PID: 2060 at lib/stackdepot.c:304 stack_depot_print+0x66/0x70 lib/stackdepot.c:276
Modules linked in:
CPU: 0 PID: 2060 Comm: syz-executor.1 Tainted: G        W         5.17.0-rc1-syzkaller-00002-g0966d385830d #0
Hardware name: riscv-virtio,qemu (DT)
epc : stack_depot_fetch lib/stackdepot.c:304 [inline]
epc : stack_depot_print+0x66/0x70 lib/stackdepot.c:276
 ra : stack_depot_fetch lib/stackdepot.c:304 [inline]
 ra : stack_depot_print+0x66/0x70 lib/stackdepot.c:276
epc : ffffffff80c00b8a ra : ffffffff80c00b8a sp : ffffaf800ee1fd60
 gp : ffffffff85863ac0 tp : ffffaf800e6d9840 t0 : ffffffff86bcb657
 t1 : fffff5ef0b53910c t2 : 0000000000000000 s0 : ffffaf800ee1fd70
 s1 : ffffaf807aa786c0 a0 : 000000000000003c a1 : 00000000000f0000
 a2 : 0000000000010506 a3 : ffffffff8012252a a4 : 93721f8c2c1ff900
 a5 : 93721f8c2c1ff900 a6 : 0000000000f00000 a7 : ffffaf805a9c8863
 s2 : ffffaf800ee1ff90 s3 : ffffaf8007202140 s4 : ffffaf800ee1e000
 s5 : ffffaf800ee1f000 s6 : 0000000000003fff s7 : 8000000000000009
 s8 : ffffffff85889780 s9 : 1ffff5f001dc400c s10: ffffffff84b73e00
 s11: ffffffff80256d34 t3 : fffffffff3f3f300 t4 : fffff5ef0b53910c
 t5 : fffff5ef0b53910d t6 : ffffaf800ee1f858
status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003
[<ffffffff80474a22>] describe_object_stacks mm/kasan/report.c:221 [inline]
[<ffffffff80474a22>] describe_object mm/kasan/report.c:231 [inline]
[<ffffffff80474a22>] print_address_description.constprop.0+0x2ae/0x330 mm/kasan/report.c:263
[<ffffffff80474d4c>] __kasan_report mm/kasan/report.c:442 [inline]
[<ffffffff80474d4c>] kasan_report+0x184/0x1e0 mm/kasan/report.c:459
[<ffffffff80475b20>] check_region_inline mm/kasan/generic.c:183 [inline]
[<ffffffff80475b20>] __asan_load8+0x6e/0x96 mm/kasan/generic.c:256
[<ffffffff80c43cf8>] riscv_intc_irq+0x24/0xc8 drivers/irqchip/irq-riscv-intc.c:24
[<ffffffff831a1a1a>] generic_handle_arch_irq+0x36/0x54 kernel/irq/handle.c:238
[<ffffffff80005724>] ret_from_exception+0x0/0x10
[<ffffffff831a24b0>] check_preemption_disabled+0x3a/0x192 lib/smp_processor_id.c:16
irq event stamp: 52003
hardirqs last  enabled at (52002): [<ffffffff831afd54>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (52002): [<ffffffff831afd54>] _raw_spin_unlock_irqrestore+0x68/0x98 kernel/locking/spinlock.c:194
hardirqs last disabled at (52003): [<ffffffff8000e866>] __trace_hardirqs_off+0x18/0x20 arch/riscv/kernel/trace_irq.c:25
softirqs last  enabled at (51826): [<ffffffff831b0bd0>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (51826): [<ffffffff831b0bd0>] __do_softirq+0x618/0x8fc kernel/softirq.c:587
softirqs last disabled at (51831): [<ffffffff80061288>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (51831): [<ffffffff80061288>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (51831): [<ffffffff80061288>] __irq_exit_rcu+0x142/0x1f8 kernel/softirq.c:637
---[ end trace 0000000000000000 ]---

The buggy address belongs to the object at ffffaf800ee1e000
 which belongs to the cache kmalloc-4k of size 4096
The buggy address is located 3984 bytes to the right of
 4096-byte region [ffffaf800ee1e000, ffffaf800ee1f000)
The buggy address belongs to the page:
page:ffffaf807aa786c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8f018
head:ffffaf807aa786c0 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x8800010200(slab|head|section=17|node=0|zone=0)
raw: 0000008800010200 0000000000000000 0000000000000122 ffffaf8007202140
raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000
raw: 00000000000007ff
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2040(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2072, ts 694582396800, free_ts 563883942900
 __set_page_owner+0x48/0x136 mm/page_owner.c:183
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0xd0/0x10a mm/page_alloc.c:2427
 prep_new_page mm/page_alloc.c:2434 [inline]
 get_page_from_freelist+0x8da/0x12d8 mm/page_alloc.c:4165
 __alloc_pages+0x150/0x3b6 mm/page_alloc.c:5389
 alloc_pages+0x132/0x2a6 mm/mempolicy.c:2271
 alloc_slab_page.constprop.0+0xc2/0xfa mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x25a/0x2cc mm/slub.c:2004
 ___slab_alloc+0x56e/0x918 mm/slub.c:3018
 __slab_alloc.constprop.0+0x50/0x8c mm/slub.c:3105
 slab_alloc_node mm/slub.c:3196 [inline]
 slab_alloc mm/slub.c:3238 [inline]
 __kmalloc+0x268/0x318 mm/slub.c:4420
 kmalloc include/linux/slab.h:586 [inline]
 tomoyo_realpath_from_path+0x9c/0x3f4 security/tomoyo/realpath.c:254
 tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
 tomoyo_check_open_permission+0x282/0x348 security/tomoyo/file.c:771
 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline]
 tomoyo_file_open+0x78/0x7c security/tomoyo/tomoyo.c:306
 security_file_open+0x44/0x9a security/security.c:1627
 do_dentry_open+0x1c6/0x7d4 fs/open.c:811
 vfs_open+0x52/0x5e fs/open.c:959
page last free stack trace:
 __reset_page_owner+0x4a/0xea mm/page_owner.c:142
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1352 [inline]
 free_pcp_prepare+0x29c/0x45e mm/page_alloc.c:1404
 free_unref_page_prepare mm/page_alloc.c:3325 [inline]
 free_unref_page+0x6a/0x31e mm/page_alloc.c:3404
 free_the_page mm/page_alloc.c:706 [inline]
 free_compound_page+0x70/0x8a mm/page_alloc.c:729
 destroy_compound_page include/linux/mm.h:889 [inline]
 __put_compound_page+0x7c/0xb0 mm/swap.c:112
 __put_page+0x48/0x100 mm/swap.c:128
 folio_put include/linux/mm.h:1199 [inline]
 put_page include/linux/mm.h:1237 [inline]
 __skb_frag_unref include/linux/skbuff.h:3178 [inline]
 skb_release_data+0x2f8/0x3c4 net/core/skbuff.c:672
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb net/core/skbuff.c:756 [inline]
 kfree_skb_reason net/core/skbuff.c:776 [inline]
 kfree_skb_reason+0x11a/0x40a net/core/skbuff.c:770
 kfree_skb include/linux/skbuff.h:1114 [inline]
 kfree_skb_list net/core/skbuff.c:785 [inline]
 skb_release_data+0x33a/0x3c4 net/core/skbuff.c:675
 skb_release_all net/core/skbuff.c:742 [inline]
 __kfree_skb+0x38/0x50 net/core/skbuff.c:756
 __sk_defer_free_flush net/ipv4/tcp.c:1592 [inline]
 sk_defer_free_flush include/net/tcp.h:1378 [inline]
 tcp_recvmsg+0x1f2/0x414 net/ipv4/tcp.c:2566
 inet_recvmsg+0x10a/0x4ba net/ipv4/af_inet.c:850
 sock_recvmsg_nosec net/socket.c:948 [inline]
 sock_recvmsg net/socket.c:966 [inline]
 sock_recvmsg net/socket.c:962 [inline]
 sock_read_iter+0x26c/0x2ba net/socket.c:1039
 call_read_iter include/linux/fs.h:2068 [inline]
 new_sync_read+0x3ae/0x3d8 fs/read_write.c:400
 vfs_read+0x2ce/0x324 fs/read_write.c:481
 ksys_read+0x1c4/0x224 fs/read_write.c:619

Memory state around the buggy address:
 ffffaf800ee1fe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffffaf800ee1ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffaf800ee1ff80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
                         ^
 ffffaf800ee20000: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
 ffffaf800ee20080: f1 f1 04 f2 04 f3 f3 f3 00 00 00 00 00 00 00 00
==================================================================

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-qemu2-riscv64 2022/11/18 06:48 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes 0966d385830d 5bb70014 .config console log report info KASAN: slab-out-of-bounds Read in riscv_intc_irq
ci-qemu2-riscv64 2022/10/25 22:58 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes 0966d385830d 1984aebd .config console log report info KASAN: slab-out-of-bounds Read in riscv_intc_irq
ci-qemu2-riscv64 2022/12/21 09:58 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes 0966d385830d d3e76707 .config console log report info KASAN: use-after-free Read in riscv_intc_irq
* Struck through repros no longer work on HEAD.