Message-ID: <tencent_49DA3E780998A9B96ADC9FF658CC84641808@qq.com>
Date: Sun, 16 Mar 2025 20:13:21 -0400
From: "ffhgfv" <xnxc22xnxc22@...com>
To: "hannes" <hannes@...xchg.org>, "yosry.ahmed" <yosry.ahmed@...ux.dev>, "nphamcs" <nphamcs@...il.com>, "chengming.zhou" <chengming.zhou@...ux.dev>, "akpm" <akpm@...ux-foundation.org>
Cc: "linux-mm" <linux-mm@...ck.org>, "linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Linux6.14-rc5:   KASAN: use-after-free Read in zswap_store 

Hello, I found a bug titled " KASAN: use-after-free Read in zswap_store " with modified syzkaller in the Linux6.14-rc5.
If you fix this issue, please add the following tag to the commit:  Reported-by: Jianzhou Zhao <xnxc22xnxc22@...com>,    xingwei lee <xrivendell7@...il.com>, Zhizhuo Tang <strforexctzzchange@...mail.com>

I use the same kernel as syzbot instance upstream: 7eb172143d5508b4da468ed59ee857c6e5e01da6
kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&amp;x=da4b04ae798b7ef6
compiler: gcc version 11.4.0
------------[ cut here ]-----------------------------------------
 TITLE:   KASAN: use-after-free Read in zswap_store 
==================================================================
==================================================================
BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
BUG: KASAN: use-after-free in do_raw_spin_lock+0x285/0x2e0 kernel/locking/spinlock_debug.c:115
Read of size 4 at addr ffff88804e78e014 by task kswapd0/98

CPU: 0 UID: 0 PID: 98 Comm: kswapd0 Not tainted 6.14.0-rc5-dirty #11
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
Call Trace:
 <task>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1b0 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xc1/0x630 mm/kasan/report.c:521
 kasan_report+0x93/0xc0 mm/kasan/report.c:634
 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline]
 do_raw_spin_lock+0x285/0x2e0 kernel/locking/spinlock_debug.c:115
 spin_lock include/linux/spinlock.h:351 [inline]
 z3fold_page_lock mm/z3fold.c:223 [inline]
 z3fold_alloc mm/z3fold.c:1060 [inline]
 z3fold_zpool_malloc+0x9b1/0x1410 mm/z3fold.c:1388
 zswap_compress mm/zswap.c:971 [inline]
 zswap_store_page mm/zswap.c:1462 [inline]
 zswap_store+0xe46/0x41e0 mm/zswap.c:1571
 swap_writepage+0x3a7/0x1430 mm/page_io.c:278
 pageout+0x3bf/0xac0 mm/vmscan.c:696
 shrink_folio_list+0x3509/0x4480 mm/vmscan.c:1402
 evict_folios+0x849/0x2100 mm/vmscan.c:4660
 try_to_shrink_lruvec+0x608/0x9b0 mm/vmscan.c:4821
 shrink_one+0x412/0x7d0 mm/vmscan.c:4866
 shrink_many mm/vmscan.c:4929 [inline]
 lru_gen_shrink_node mm/vmscan.c:5007 [inline]
 shrink_node+0x2355/0x3c10 mm/vmscan.c:5978
 kswapd_shrink_node mm/vmscan.c:6807 [inline]
 balance_pgdat+0xa85/0x1740 mm/vmscan.c:6999
 kswapd+0x4c0/0xbe0 mm/vmscan.c:7264
 kthread+0x427/0x880 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </task>

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x564c9cd0a pfn:0x4e78e
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000000 ffffea000139e508 ffffea000139e248 0000000000000000
raw: 0000000564c9cd0a 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12800(GFP_NOWAIT|__GFP_NORETRY), pid 98, tgid 98 (kswapd0), ts 431124924160, free_ts 431131252025
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook mm/page_alloc.c:1551 [inline]
 prep_new_page+0x1b0/0x1e0 mm/page_alloc.c:1559
 get_page_from_freelist+0x19a2/0x3250 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x324/0x6b0 mm/page_alloc.c:4739
 alloc_pages_mpol+0x20a/0x550 mm/mempolicy.c:2270
 alloc_pages_noprof+0x1c/0x250 mm/mempolicy.c:2361
 z3fold_alloc mm/z3fold.c:1036 [inline]
 z3fold_zpool_malloc+0x7aa/0x1410 mm/z3fold.c:1388
 zswap_compress mm/zswap.c:971 [inline]
 zswap_store_page mm/zswap.c:1462 [inline]
 zswap_store+0xe46/0x41e0 mm/zswap.c:1571
 swap_writepage+0x3a7/0x1430 mm/page_io.c:278
 pageout+0x3bf/0xac0 mm/vmscan.c:696
 shrink_folio_list+0x3509/0x4480 mm/vmscan.c:1402
 evict_folios+0x849/0x2100 mm/vmscan.c:4660
 try_to_shrink_lruvec+0x608/0x9b0 mm/vmscan.c:4821
 shrink_one+0x412/0x7d0 mm/vmscan.c:4866
 shrink_many mm/vmscan.c:4929 [inline]
 lru_gen_shrink_node mm/vmscan.c:5007 [inline]
 shrink_node+0x2355/0x3c10 mm/vmscan.c:5978
 kswapd_shrink_node mm/vmscan.c:6807 [inline]
 balance_pgdat+0xa85/0x1740 mm/vmscan.c:6999
 kswapd+0x4c0/0xbe0 mm/vmscan.c:7264
page last free pid 38 tgid 38 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0x7aa/0x1290 mm/page_alloc.c:2660
 __folio_put+0x304/0x3d0 mm/swap.c:112
 folio_put include/linux/mm.h:1489 [inline]
 migrate_folio_done+0x29b/0x340 mm/migrate.c:1180
 migrate_folio_move mm/migrate.c:1402 [inline]
 migrate_folios_move mm/migrate.c:1712 [inline]
 migrate_pages_batch+0x1c0b/0x2f30 mm/migrate.c:1959
 migrate_pages_sync+0x110/0x8d0 mm/migrate.c:1989
 migrate_pages+0x1b19/0x22d0 mm/migrate.c:2098
 compact_zone+0x1b40/0x3ed0 mm/compaction.c:2663
 compact_node+0x19c/0x2d0 mm/compaction.c:2932
 kcompactd+0x328/0x940 mm/compaction.c:3226
 kthread+0x427/0x880 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff88804e78df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88804e78df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
&gt;ffff88804e78e000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                         ^
 ffff88804e78e080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804e78e100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================


I hope it helps.
Best regards
Jianzhou Zhao</strforexctzzchange@...mail.com></xrivendell7@...il.com></xnxc22xnxc22@...com>

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