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Mon, 15 Sep 2025 10:29:34 -0700 (PDT) Received: from pop-os.attlocal.net ([2600:1700:6476:1430:f9f0:b170:b9db:2d53]) by smtp.gmail.com with ESMTPSA id 00721157ae682-72f769292d4sm34016457b3.27.2025.09.15.10.29.33 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Sep 2025 10:29:34 -0700 (PDT) Message-ID: <979490b3e038d93aebccfa9a55e79d3f906e1bb5.camel@dubeyko.com> Subject: Re: [Linux Kernel Bug] KASAN: slab-out-of-bounds Read in hfsplus_strcasecmp From: Viacheslav Dubeyko To: Jiaming Zhang , frank.li@vivo.com, glaubitz@physik.fu-berlin.de, linux-fsdevel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, syzkaller@googlegroups.com Date: Mon, 15 Sep 2025 10:29:32 -0700 In-Reply-To: References: Autocrypt: addr=slava@dubeyko.com; prefer-encrypt=mutual; keydata=mQINBGgaTLYBEADaJc/WqWTeunGetXyyGJ5Za7b23M/ozuDCWCp+yWUa2GqQKH40dxRIR zshgOmAue7t9RQJU9lxZ4ZHWbi1Hzz85+0omefEdAKFmxTO6+CYV0g/sapU0wPJws3sC2Pbda9/eJ ZcvScAX2n/PlhpTnzJKf3JkHh3nM1ACO3jzSe2/muSQJvqMLG2D71ccekr1RyUh8V+OZdrPtfkDam V6GOT6IvyE+d+55fzmo20nJKecvbyvdikWwZvjjCENsG9qOf3TcCJ9DDYwjyYe1To8b+mQM9nHcxp jUsUuH074BhISFwt99/htZdSgp4csiGeXr8f9BEotRB6+kjMBHaiJ6B7BIlDmlffyR4f3oR/5hxgy dvIxMocqyc03xVyM6tA4ZrshKkwDgZIFEKkx37ec22ZJczNwGywKQW2TGXUTZVbdooiG4tXbRBLxe ga/NTZ52ZdEkSxAUGw/l0y0InTtdDIWvfUT+WXtQcEPRBE6HHhoeFehLzWL/o7w5Hog+0hXhNjqte fzKpI2fWmYzoIb6ueNmE/8sP9fWXo6Av9m8B5hRvF/hVWfEysr/2LSqN+xjt9NEbg8WNRMLy/Y0MS p5fgf9pmGF78waFiBvgZIQNuQnHrM+0BmYOhR0JKoHjt7r5wLyNiKFc8b7xXndyCDYfniO3ljbr0j tXWRGxx4to6FwARAQABtCZWaWFjaGVzbGF2IER1YmV5a28gPHNsYXZhQGR1YmV5a28uY29tPokCVw QTAQoAQQIbAQUJA8JnAAULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBFXDC2tnzsoLQtrbBDlc2cL fhEB1BQJoGl5PAhkBAAoJEDlc2cLfhEB17DsP/jy/Dx19MtxWOniPqpQf2s65enkDZuMIQ94jSg7B F2qTKIbNR9SmsczjyjC+/J7m7WZRmcqnwFYMOyNfh12aF2WhjT7p5xEAbvfGVYwUpUrg/lcacdT0D Yk61GGc5ZB89OAWHLr0FJjI54bd7kn7E/JRQF4dqNsxU8qcPXQ0wLHxTHUPZu/w5Zu/cO+lQ3H0Pj pSEGaTAh+tBYGSvQ4YPYBcV8+qjTxzeNwkw4ARza8EjTwWKP2jWAfA/ay4VobRfqNQ2zLoo84qDtN Uxe0zPE2wobIXELWkbuW/6hoQFPpMlJWz+mbvVms57NAA1HO8F5c1SLFaJ6dN0AQbxrHi45/cQXla 9hSEOJjxcEnJG/ZmcomYHFneM9K1p1K6HcGajiY2BFWkVet9vuHygkLWXVYZ0lr1paLFR52S7T+cf 6dkxOqu1ZiRegvFoyzBUzlLh/elgp3tWUfG2VmJD3lGpB3m5ZhwQ3rFpK8A7cKzgKjwPp61Me0o9z HX53THoG+QG+o0nnIKK7M8+coToTSyznYoq9C3eKeM/J97x9+h9tbizaeUQvWzQOgG8myUJ5u5Dr4 6tv9KXrOJy0iy/dcyreMYV5lwODaFfOeA4Lbnn5vRn9OjuMg1PFhCi3yMI4lA4umXFw0V2/OI5rgW BQELhfvW6mxkihkl6KLZX8m1zcHitCpWaWFjaGVzbGF2IER1YmV5a28gPFNsYXZhLkR1YmV5a29Aa WJtLmNvbT6JAlQEEwEKAD4WIQRVwwtrZ87KC0La2wQ5XNnC34RAdQUCaBpd7AIbAQUJA8JnAAULCQ gHAgYVCgkICwIEFgIDAQIeAQIXgAAKCRA5XNnC34RAdYjFEACiWBEybMt1xjRbEgaZ3UP5i2bSway DwYDvgWW5EbRP7JcqOcZ2vkJwrK3gsqC3FKpjOPh7ecE0I4vrabH1Qobe2N8B2Y396z24mGnkTBbb 16Uz3PC93nFN1BA0wuOjlr1/oOTy5gBY563vybhnXPfSEUcXRd28jI7z8tRyzXh2tL8ZLdv1u4vQ8 E0O7lVJ55p9yGxbwgb5vXU4T2irqRKLxRvU80rZIXoEM7zLf5r7RaRxgwjTKdu6rYMUOfoyEQQZTD 4Xg9YE/X8pZzcbYFs4IlscyK6cXU0pjwr2ssjearOLLDJ7ygvfOiOuCZL+6zHRunLwq2JH/RmwuLV mWWSbgosZD6c5+wu6DxV15y7zZaR3NFPOR5ErpCFUorKzBO1nA4dwOAbNym9OGkhRgLAyxwpea0V0 ZlStfp0kfVaSZYo7PXd8Bbtyjali0niBjPpEVZdgtVUpBlPr97jBYZ+L5GF3hd6WJFbEYgj+5Af7C UjbX9DHweGQ/tdXWRnJHRzorxzjOS3003ddRnPtQDDN3Z/XzdAZwQAs0RqqXrTeeJrLppFUbAP+HZ TyOLVJcAAlVQROoq8PbM3ZKIaOygjj6Yw0emJi1D9OsN2UKjoe4W185vamFWX4Ba41jmCPrYJWAWH fAMjjkInIPg7RLGs8FiwxfcpkILP0YbVWHiNAabQoVmlhY2hlc2xhdiBEdWJleWtvIDx2ZHViZXlr b0BrZXJuZWwub3JnPokCVAQTAQoAPhYhBFXDC2tnzsoLQtrbBDlc2cLfhEB1BQJoVemuAhsBBQkDw mcABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEDlc2cLfhEB1GRwP/1scX5HO9Sk7dRicLD/fxo ipwEs+UbeA0/TM8OQfdRI4C/tFBYbQCR7lD05dfq8VsYLEyrgeLqP/iRhabLky8LTaEdwoAqPDc/O 9HRffx/faJZqkKc1dZryjqS6b8NExhKOVWmDqN357+Cl/H4hT9wnvjCj1YEqXIxSd/2Pc8+yw/KRC AP7jtRzXHcc/49Lpz/NU5irScusxy2GLKa5o/13jFK3F1fWX1wsOJF8NlTx3rLtBy4GWHITwkBmu8 zI4qcJGp7eudI0l4xmIKKQWanEhVdzBm5UnfyLIa7gQ2T48UbxJlWnMhLxMPrxgtC4Kos1G3zovEy Ep+fJN7D1pwN9aR36jVKvRsX7V4leIDWGzCdfw1FGWkMUfrRwgIl6i3wgqcCP6r9YSWVQYXdmwdMu 1RFLC44iF9340S0hw9+30yGP8TWwd1mm8V/+zsdDAFAoAwisi5QLLkQnEsJSgLzJ9daAsE8KjMthv hUWHdpiUSjyCpigT+KPl9YunZhyrC1jZXERCDPCQVYgaPt+Xbhdjcem/ykv8UVIDAGVXjuk4OW8la nf8SP+uxkTTDKcPHOa5rYRaeNj7T/NClRSd4z6aV3F6pKEJnEGvv/DFMXtSHlbylhyiGKN2Amd0b4 9jg+DW85oNN7q2UYzYuPwkHsFFq5iyF1QggiwYYTpoVXsw Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (by Flathub.org) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2025-09-15 at 11:04 +0800, Jiaming Zhang wrote: > Dear Linux kernel developers and maintainers: >=20 > We are writing to report a slab-out-of-bounds bug discovered in the > hfsplus subsystem with our modified syzkaller. This bug is > reproducible on the latest version (v6.17-rc6, commit > f83ec76bf285bea5727f478a68b894f5543ca76e). >=20 Thank you for the report. Issue has been created: https://github.com/hfs-linux-kernel/hfs-linux-kernel/issues/238 Thanks, Slava. > The kernel console output, kernel config, syzkaller reproducer, and C > reproducer are attached to this email to help analysis. The KASAN > report from v6.17-rc6, formatted by syz-symbolize, is listed below: >=20 > hfsplus: invalid length 63743 has been corrected to 255 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D > BUG: KASAN: slab-out-of-bounds in hfsplus_strcasecmp+0x1bc/0x490 > fs/hfsplus/unicode.c:47 > Read of size 2 at addr ffff88804b8d640c by task repro.out/9757 >=20 > CPU: 1 UID: 0 PID: 9757 Comm: repro.out Not tainted 6.17.0-rc6 #1 > PREEMPT(full) > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 > 04/01/2014 > Call Trace: > =C2=A0 > =C2=A0__dump_stack lib/dump_stack.c:94 [inline] > =C2=A0dump_stack_lvl+0x1c1/0x2a0 lib/dump_stack.c:120 > =C2=A0print_address_description mm/kasan/report.c:378 [inline] > =C2=A0print_report+0x17e/0x810 mm/kasan/report.c:482 > =C2=A0kasan_report+0x147/0x180 mm/kasan/report.c:595 > =C2=A0hfsplus_strcasecmp+0x1bc/0x490 fs/hfsplus/unicode.c:47 > =C2=A0hfs_find_rec_by_key+0xa6/0x1e0 fs/hfsplus/bfind.c:89 > =C2=A0__hfsplus_brec_find+0x18b/0x480 fs/hfsplus/bfind.c:124 > =C2=A0hfsplus_brec_find+0x289/0x500 fs/hfsplus/bfind.c:184 > =C2=A0hfsplus_brec_read+0x2b/0x120 fs/hfsplus/bfind.c:211 > =C2=A0hfsplus_lookup+0x2aa/0x890 fs/hfsplus/dir.c:52 > =C2=A0__lookup_slow+0x294/0x3d0 fs/namei.c:1808 > =C2=A0lookup_slow+0x53/0x70 fs/namei.c:1825 > =C2=A0walk_component+0x2d4/0x400 fs/namei.c:2129 > =C2=A0lookup_last fs/namei.c:2630 [inline] > =C2=A0path_lookupat+0x163/0x430 fs/namei.c:2654 > =C2=A0filename_lookup+0x212/0x570 fs/namei.c:2683 > =C2=A0user_path_at+0x3a/0x60 fs/namei.c:3127 > =C2=A0ksys_umount fs/namespace.c:2112 [inline] > =C2=A0__do_sys_umount fs/namespace.c:2120 [inline] > =C2=A0__se_sys_umount fs/namespace.c:2118 [inline] > =C2=A0__x64_sys_umount+0xee/0x160 fs/namespace.c:2118 > =C2=A0do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > =C2=A0do_syscall_64+0xf3/0x3b0 arch/x86/entry/syscall_64.c:94 > =C2=A0entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x452627 > Code: 06 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 > 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> > 3d > 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffc5dd08ae8 EFLAGS: 00000206 ORIG_RAX: > 00000000000000a6 > RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000452627 > RDX: 0000000000000009 RSI: 0000000000000009 RDI: 00007ffc5dd08b90 > RBP: 00007ffc5dd09bd0 R08: 0000000000000015 R09: 00007ffc5dd08980 > R10: 00000000004b9560 R11: 0000000000000206 R12: 000000000040a070 > R13: 0000000000000000 R14: 00000000004bc018 R15: 00000000004004a0 > =C2=A0 >=20 > Allocated by task 9757: > =C2=A0kasan_save_stack mm/kasan/common.c:47 [inline] > =C2=A0kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 > =C2=A0poison_kmalloc_redzone mm/kasan/common.c:388 [inline] > =C2=A0__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:405 > =C2=A0kasan_kmalloc include/linux/kasan.h:260 [inline] > =C2=A0__do_kmalloc_node mm/slub.c:4376 [inline] > =C2=A0__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4388 > =C2=A0kmalloc_noprof include/linux/slab.h:909 [inline] > =C2=A0hfsplus_find_init+0x8c/0x1d0 fs/hfsplus/bfind.c:21 > =C2=A0hfsplus_lookup+0x19c/0x890 fs/hfsplus/dir.c:44 > =C2=A0__lookup_slow+0x294/0x3d0 fs/namei.c:1808 > =C2=A0lookup_slow+0x53/0x70 fs/namei.c:1825 > =C2=A0walk_component+0x2d4/0x400 fs/namei.c:2129 > =C2=A0lookup_last fs/namei.c:2630 [inline] > =C2=A0path_lookupat+0x163/0x430 fs/namei.c:2654 > =C2=A0filename_lookup+0x212/0x570 fs/namei.c:2683 > =C2=A0user_path_at+0x3a/0x60 fs/namei.c:3127 > =C2=A0ksys_umount fs/namespace.c:2112 [inline] > =C2=A0__do_sys_umount fs/namespace.c:2120 [inline] > =C2=A0__se_sys_umount fs/namespace.c:2118 [inline] > =C2=A0__x64_sys_umount+0xee/0x160 fs/namespace.c:2118 > =C2=A0do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > =C2=A0do_syscall_64+0xf3/0x3b0 arch/x86/entry/syscall_64.c:94 > =C2=A0entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > The buggy address belongs to the object at ffff88804b8d6000 > =C2=A0which belongs to the cache kmalloc-2k of size 2048 > The buggy address is located 0 bytes to the right of > =C2=A0allocated 1036-byte region [ffff88804b8d6000, ffff88804b8d640c) >=20 > The buggy address belongs to the physical page: > page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 > pfn:0x4b8d0 > head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 > pincount:0 > anon flags: 0x4fff00000000040(head|node=3D1|zone=3D1|lastcpupid=3D0x7ff) > page_type: f5(slab) > raw: 04fff00000000040 ffff88801a442000 0000000000000000 > dead000000000001 > raw: 0000000000000000 0000000080080008 00000000f5000000 > 0000000000000000 > head: 04fff00000000040 ffff88801a442000 0000000000000000 > dead000000000001 > head: 0000000000000000 0000000080080008 00000000f5000000 > 0000000000000000 > head: 04fff00000000003 ffffea00012e3401 00000000ffffffff > 00000000ffffffff > head: ffffffffffffffff 0000000000000000 00000000ffffffff > 0000000000000008 > 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_NOMEMALL > OC), > pid 8133, tgid 8133 (sh), ts 23500816499, free_ts 23484371257 > =C2=A0set_page_owner include/linux/page_owner.h:32 [inline] > =C2=A0post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 > =C2=A0prep_new_page mm/page_alloc.c:1859 [inline] > =C2=A0get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 > =C2=A0__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 > =C2=A0alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 > =C2=A0alloc_slab_page mm/slub.c:2492 [inline] > =C2=A0allocate_slab+0x8a/0x370 mm/slub.c:2660 > =C2=A0new_slab mm/slub.c:2714 [inline] > =C2=A0___slab_alloc+0xbeb/0x1420 mm/slub.c:3901 > =C2=A0__slab_alloc mm/slub.c:3992 [inline] > =C2=A0__slab_alloc_node mm/slub.c:4067 [inline] > =C2=A0slab_alloc_node mm/slub.c:4228 [inline] > =C2=A0__do_kmalloc_node mm/slub.c:4375 [inline] > =C2=A0__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4388 > =C2=A0kmalloc_noprof include/linux/slab.h:909 [inline] > =C2=A0kzalloc_noprof include/linux/slab.h:1039 [inline] > =C2=A0tomoyo_init_log+0x1a32/0x1f30 security/tomoyo/audit.c:275 > =C2=A0tomoyo_supervisor+0x340/0x1490 security/tomoyo/common.c:2198 > =C2=A0tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] > =C2=A0tomoyo_env_perm+0x149/0x1e0 security/tomoyo/environ.c:63 > =C2=A0tomoyo_environ security/tomoyo/domain.c:672 [inline] > =C2=A0tomoyo_find_next_domain+0x15cf/0x1aa0 security/tomoyo/domain.c:888 > =C2=A0tomoyo_bprm_check_security+0x11c/0x180 security/tomoyo/tomoyo.c:102 > =C2=A0security_bprm_check+0x89/0x270 security/security.c:1302 > =C2=A0search_binary_handler fs/exec.c:1660 [inline] > =C2=A0exec_binprm fs/exec.c:1702 [inline] > =C2=A0bprm_execve+0x8ee/0x1450 fs/exec.c:1754 > =C2=A0do_execveat_common+0x521/0x6b0 fs/exec.c:1860 > =C2=A0do_execve fs/exec.c:1934 [inline] > =C2=A0__do_sys_execve fs/exec.c:2010 [inline] > =C2=A0__se_sys_execve fs/exec.c:2005 [inline] > =C2=A0__x64_sys_execve+0x94/0xb0 fs/exec.c:2005 > page last free pid 5289 tgid 5289 stack trace: > =C2=A0reset_page_owner include/linux/page_owner.h:25 [inline] > =C2=A0free_pages_prepare mm/page_alloc.c:1395 [inline] > =C2=A0__free_frozen_pages+0xbc0/0xd40 mm/page_alloc.c:2895 > =C2=A0discard_slab mm/slub.c:2758 [inline] > =C2=A0__put_partials+0x156/0x1a0 mm/slub.c:3223 > =C2=A0put_cpu_partial+0x17c/0x250 mm/slub.c:3298 > =C2=A0__slab_free+0x2d5/0x3c0 mm/slub.c:4565 > =C2=A0qlink_free mm/kasan/quarantine.c:163 [inline] > =C2=A0qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 > =C2=A0kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 > =C2=A0__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340 > =C2=A0kasan_slab_alloc include/linux/kasan.h:250 [inline] > =C2=A0slab_post_alloc_hook mm/slub.c:4191 [inline] > =C2=A0slab_alloc_node mm/slub.c:4240 [inline] > =C2=A0kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4292 > =C2=A0__alloc_skb+0x12a/0x2f0 net/core/skbuff.c:659 > =C2=A0netlink_sendmsg+0x5c6/0xb30 net/netlink/af_netlink.c:1871 > =C2=A0sock_sendmsg_nosec net/socket.c:714 [inline] > =C2=A0__sock_sendmsg+0x219/0x270 net/socket.c:729 > =C2=A0____sys_sendmsg+0x507/0x840 net/socket.c:2614 > =C2=A0___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 > =C2=A0__sys_sendmsg net/socket.c:2700 [inline] > =C2=A0__do_sys_sendmsg net/socket.c:2705 [inline] > =C2=A0__se_sys_sendmsg net/socket.c:2703 [inline] > =C2=A0__x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 > =C2=A0do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] > =C2=A0do_syscall_64+0xf3/0x3b0 arch/x86/entry/syscall_64.c:94 > =C2=A0entry_SYSCALL_64_after_hwframe+0x77/0x7f >=20 > Memory state around the buggy address: > =C2=A0ffff88804b8d6300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > =C2=A0ffff88804b8d6380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > > ffff88804b8d6400: 00 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ^ > =C2=A0ffff88804b8d6480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > =C2=A0ffff88804b8d6500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 > Please let me know if any further information is required. >=20 > Best Regards, > Jiaming Zhang.