syzbot


KMSAN: uninit-value in __hfs_ext_cache_extent

Status: upstream: reported on 2024/05/29 07:06
Subsystems: hfs
[Documentation on labels]
Reported-by: syzbot+ca5e77364a05ff2d8c8b@syzkaller.appspotmail.com
First crash: 24d, last: 24d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [hfs?] KMSAN: uninit-value in __hfs_ext_cache_extent 0 (1) 2024/05/29 07:06

Sample crash report:
loop1: detected capacity change from 0 to 64
=====================================================
BUG: KMSAN: uninit-value in __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
BUG: KMSAN: uninit-value in __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 __hfs_ext_read_extent fs/hfs/extent.c:160 [inline]
 __hfs_ext_cache_extent+0x69f/0x7e0 fs/hfs/extent.c:179
 hfs_file_truncate+0x769/0xd30 fs/hfs/extent.c:526
 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:652
 notify_change+0x1a07/0x1af0 fs/attr.c:497
 do_truncate fs/open.c:65 [inline]
 do_ftruncate+0x8d3/0xc00 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_sys_ftruncate fs/open.c:207 [inline]
 __se_sys_ftruncate fs/open.c:205 [inline]
 __x64_sys_ftruncate+0x133/0x280 fs/open.c:205
 x64_sys_call+0x247a/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:78
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:3877 [inline]
 slab_alloc_node mm/slub.c:3918 [inline]
 __do_kmalloc_node mm/slub.c:4038 [inline]
 __kmalloc+0x6e4/0x1060 mm/slub.c:4052
 kmalloc include/linux/slab.h:632 [inline]
 hfs_find_init+0x91/0x250 fs/hfs/bfind.c:21
 hfs_file_truncate+0x3c5/0xd30 fs/hfs/extent.c:512
 hfs_inode_setattr+0x998/0xab0 fs/hfs/inode.c:652
 notify_change+0x1a07/0x1af0 fs/attr.c:497
 do_truncate fs/open.c:65 [inline]
 do_ftruncate+0x8d3/0xc00 fs/open.c:181
 do_sys_ftruncate fs/open.c:199 [inline]
 __do_sys_ftruncate fs/open.c:207 [inline]
 __se_sys_ftruncate fs/open.c:205 [inline]
 __x64_sys_ftruncate+0x133/0x280 fs/open.c:205
 x64_sys_call+0x247a/0x3b50 arch/x86/include/generated/asm/syscalls_64.h:78
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

CPU: 1 PID: 8137 Comm: syz-executor.1 Not tainted 6.9.0-syzkaller-02707-g614da38e2f7a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
=====================================================

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/25 07:31 upstream 614da38e2f7a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __hfs_ext_cache_extent
2024/05/25 07:30 upstream 614da38e2f7a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __hfs_ext_cache_extent
2024/05/25 07:01 upstream 614da38e2f7a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __hfs_ext_cache_extent
2024/05/25 07:01 upstream 614da38e2f7a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-root KMSAN: uninit-value in __hfs_ext_cache_extent
2024/05/25 12:42 upstream 101b7a97143a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __hfs_ext_cache_extent
2024/05/25 11:45 upstream 101b7a97143a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __hfs_ext_cache_extent
2024/05/25 11:45 upstream 101b7a97143a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kmsan-gce-386-root KMSAN: uninit-value in __hfs_ext_cache_extent
* Struck through repros no longer work on HEAD.