KASAN: use-after-free Read in __vma

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
ba9c4492-0912-49cc-9a55-69bbce640577	assessment-security		💥	KASAN: use-after-free Read in __vma_adjust	2026/05/25 21:00	2026/05/25 21:00	2026/05/25 21:22	c69befb30ac10e158cc9d1557b508ee3f0eca1de	failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/cda63193ee5c81e53949b6a75c6f27e9acadfee0" "-s" "bzImage" "compile_commands.json"]: exit status 2 Root cause: scripts/clang-tools/gen_compile_commands.py:187: SyntaxWarning: invalid escape sequence '\#' ld.lld: error: undefined symbol: wcslen * * Restart config... * * * Processor type and features * Symmetric multi-processing support (SMP) [Y/n/?] y Support x2apic (X86_X2APIC) [N/y/?] n Enable MPS table (X86_MPPARSE) [Y/n/?] y Avoid speculative indirect branches in kernel (RETPOLINE) [N/y/?] n Mitigate Straight-Line-Speculation (SLS) [N/y/?] (NEW) Error in reading or end of file. x86 CPU resource control support (X86_CPU_RESCTRL) [N/y/?] n Support for extended (non-PC) x86 platforms (X86_EXTENDED_PLATFORM) [Y/n/?] y ScaleMP vSMP (X86_VSMP) [N/y/?] n Goldfish (Virtual Platform) (X86_GOLDFISH) [N/y/?] n Intel MID platform support (X86_INTEL_MID) [N/y/?] n Intel Low Power Subsystem Support (X86_INTEL_LPSS) [N/y/?] n AMD ACPI2Platform devices support (X86_AMD_PLATFORM_DEVICE) [N/y/?] n Intel SoC IOSF Sideband support for SoC platforms (IOSF_MBI) [Y/n/m/?] y Enable IOSF sideband access through debugfs (IOSF_MBI_DEBUG) [N/y/?] n Single-depth WCHAN output (SCHED_OMIT_FRAME_POINTER) [Y/n/?] y Processor family 1. Opteron/Athlon64/Hammer/K8 (MK8) 2. Intel P4 / older Netburst based Xeon (MPSC) > 3. Core 2/newer Xeon (MCORE2) 4. Intel Atom (MATOM) 5. Generic-x86-64 (GENERIC_CPU) choice[1-5?]: 3 Enable DMI scanning (DMI) [Y/n/?] y Old AMD GART IOMMU support (GART_IOMMU) [N/y/?] n Enable Maximum number of SMP Processors and NUMA Nodes (MAXSMP) [N/y/?] n Maximum number of CPUs (NR_CPUS) [8] 8 Cluster scheduler support (SCHED_CLUSTER) [Y/n/?] y Multi-core scheduler support (SCHED_MC) [Y/n/?] y CPU core priorities scheduler support (SCHED_MC_PRIO) [Y/n/?] y Reroute for broken boot IRQs (X86_REROUTE_FOR_BROKEN_BOOT_IRQS) [Y/n/?] y Machine Check / overheating reporting (X86_MCE) [Y/n/?] y Support for deprecated /dev/mcelog character device (X86_MCELOG_LEGACY) [N/y/?] n Intel MCE features (X86_MCE_INTEL) [Y/n/?] y AMD MCE features (X86_MCE_AMD) [Y/n/?] y Machine check injector support (X86_MCE_INJECT) [N/m/y/?] n Enable support for 16-bit segments (X86_16BIT) [Y/n/?] y Enable vsyscall emulation (X86_VSYSCALL_EMULATION) [Y/n/?] y IOPERM and IOPL Emulation (X86_IOPL_IOPERM) [Y/n/?] y CPU microcode loading support (MICROCODE) [Y/n/?] y Intel microcode loading support (MICROCODE_INTEL) [Y/n/?] y AMD microcode loading support (MICROCODE_AMD) [Y/n/?] y Late microcode loading (DANGEROUS) (MICROCODE_LATE_LOADING) [N/y/?] n /dev/cpu//msr - Model-specific register support (X86_MSR) [Y/n/m/?] y /dev/cpu//cpuid - CPU information support (X86_CPUID) [Y/n/m/?] y Enable 5-level page tables support (X86_5LEVEL) [N/y/?] n Enable statistic for Change Page Attribute (X86_CPA_STATISTICS) [N/y/?] n AMD Secure Memory Encryption (SME) support (AMD_MEM_ENCRYPT) [N/y/?] n NUMA Memory Allocation and Scheduler Support (NUMA) [Y/n/?] y Old style AMD Opteron NUMA detection (AMD_NUMA) [Y/n/?] y ACPI NUMA detection (X86_64_ACPI_NUMA) [Y/n/?] y NUMA emulation (NUMA_EMU) [Y/n/?] y Maximum NUMA Nodes (as a power of 2) (NODES_SHIFT) [6] 6 Enable sysfs memory/probe interface (ARCH_MEMORY_PROBE) [N/y/?] n Support non-standard NVDIMMs and ADR protected memory (X86_PMEM_LEGACY) [N/m/y/?] n Check for low memory corruption (X86_CHECK_BIOS_CORRUPTION) [N/y/?] n MTRR (Memory Type Range Register) support (MTRR) [Y/n/?] y MTRR cleanup support (MTRR_SANITIZER) [N/y/?] n x86 PAT support (X86_PAT) [Y/n/?] y x86 architectural random number generator (ARCH_RANDOM) [Y/n/?] y User Mode Instruction Prevention (X86_UMIP) [Y/n/?] y Indirect Branch Tracking (X86_KERNEL_IBT) [N/y/?] n Memory Protection Keys (X86_INTEL_MEMORY_PROTECTION_KEYS) [Y/n/?] y TSX enable mode 1. off (X86_INTEL_TSX_MODE_OFF) > 2. on (X86_INTEL_TSX_MODE_ON) 3. auto (X86_INTEL_TSX_MODE_AUTO) choice[1-3?

Title	Replies (including bot)	Last reply
[syzbot] KASAN: use-after-free Read in __vma_adjust	1 (3)	2022/06/15 16:45
[PATCH] fs/userfaultfd: Fix vma iteration in mas_for_each() loop	1 (1)	2022/06/15 16:42

Title

Replies (including bot)

Last reply

[syzbot] KASAN: use-after-free Read in __vma_adjust

1 (3)

2022/06/15 16:45

[PATCH] fs/userfaultfd: Fix vma iteration in mas_for_each() loop

1 (1)

2022/06/15 16:42

Created	Duration	User	Patch	Repo	Result
2022/06/14 10:50	18m	hdanton@sina.com	patch	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 6d0c80680317	OK log
2022/06/13 10:47	9m	hdanton@sina.com	patch	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 6d0c80680317	report log

Created

Duration

User

Patch

Repo

Result

2022/06/14 10:50

18m

hdanton@sina.com

patch

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 6d0c80680317

OK log

2022/06/13 10:47

hdanton@sina.com

patch

https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git 6d0c80680317

report log

================================================================== BUG: KASAN: use-after-free in __vma_adjust+0x18ee/0x1900 mm/mmap.c:763 Read of size 8 at addr ffff88801fefe208 by task syz-executor408/3621 CPU: 0 PID: 3621 Comm: syz-executor408 Not tainted 5.19.0-rc1-next-20220610-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 __vma_adjust+0x18ee/0x1900 mm/mmap.c:763 vma_merge+0x590/0x870 mm/mmap.c:1119 userfaultfd_release+0x4c5/0x670 fs/userfaultfd.c:888 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 ptrace_notify+0x114/0x140 kernel/signal.c:2353 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline] syscall_exit_work kernel/entry/common.c:249 [inline] syscall_exit_to_user_mode_prepare+0xdb/0x230 kernel/entry/common.c:276 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline] syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f2d02e9ef59 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 71 15 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2d02e502f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: fffffffffffffe00 RBX: 00007f2d02f284a8 RCX: 00007f2d02e9ef59 RDX: 000000000000003c RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00007f2d02f284a0 R08: 0000000000000001 R09: 0000000000000034 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f2d02e50300 R13: 0000000000000001 R14: 00007f2d02e50400 R15: 0000000000022000 </TASK> Allocated by task 3619: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3239 vm_area_dup+0x81/0x380 kernel/fork.c:466 dup_mmap+0x656/0x1090 kernel/fork.c:640 dup_mm+0x91/0x370 kernel/fork.c:1520 copy_mm kernel/fork.c:1569 [inline] copy_process+0x3c95/0x7080 kernel/fork.c:2234 kernel_clone+0xe7/0xab0 kernel/fork.c:2649 __do_sys_clone+0xba/0x100 kernel/fork.c:2783 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 3621: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kmem_cache_free+0xdd/0x5a0 mm/slub.c:3524 __vma_adjust+0x9ab/0x1900 mm/mmap.c:886 vma_merge+0x590/0x870 mm/mmap.c:1119 userfaultfd_release+0x4c5/0x670 fs/userfaultfd.c:888 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 ptrace_notify+0x114/0x140 kernel/signal.c:2353 ptrace_report_syscall include/linux/ptrace.h:420 [inline] ptrace_report_syscall_exit include/linux/ptrace.h:482 [inline] syscall_exit_work kernel/entry/common.c:249 [inline] syscall_exit_to_user_mode_prepare+0xdb/0x230 kernel/entry/common.c:276 __syscall_exit_to_user_mode_work kernel/entry/common.c:281 [inline] syscall_exit_to_user_mode+0x9/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88801fefe1b0 which belongs to the cache vm_area_struct of size 152 The buggy address is located 88 bytes inside of 152-byte region [ffff88801fefe1b0, ffff88801fefe248) The buggy address belongs to the physical page: page:ffffea00007fbf80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1fefe flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea00009ed380 dead000000000003 ffff888140006b40 raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 3327, tgid 3327 (rm), ts 28524505479, free_ts 28520297867 prep_new_page mm/page_alloc.c:2460 [inline] get_page_from_freelist+0xa64/0x3d10 mm/page_alloc.c:4279 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5500 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3239 vm_area_dup+0x81/0x380 kernel/fork.c:466 __split_vma+0x9f/0x530 mm/mmap.c:2273 do_mas_align_munmap+0x2c0/0xf00 mm/mmap.c:2399 do_mas_munmap+0x202/0x2c0 mm/mmap.c:2556 mmap_region+0x219/0x1bf0 mm/mmap.c:2604 do_mmap+0x825/0xf60 mm/mmap.c:1480 vm_mmap_pgoff+0x1b7/0x290 mm/util.c:520 ksys_mmap_pgoff+0x40d/0x5a0 mm/mmap.c:1526 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1375 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1425 free_unref_page_prepare mm/page_alloc.c:3311 [inline] free_unref_page_list+0x184/0x1530 mm/page_alloc.c:3475 release_pages+0xff1/0x2290 mm/swap.c:980 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:58 tlb_flush_mmu_free mm/mmu_gather.c:255 [inline] tlb_flush_mmu mm/mmu_gather.c:262 [inline] tlb_finish_mmu+0x147/0x7e0 mm/mmu_gather.c:353 exit_mmap+0x217/0x750 mm/mmap.c:3205 __mmput+0x128/0x4c0 kernel/fork.c:1180 mmput+0x5c/0x70 kernel/fork.c:1201 exec_mmap fs/exec.c:1038 [inline] begin_new_exec+0xfbd/0x2e50 fs/exec.c:1297 load_elf_binary+0x15a3/0x4ec0 fs/binfmt_elf.c:1002 search_binary_handler fs/exec.c:1728 [inline] exec_binprm fs/exec.c:1769 [inline] bprm_execve fs/exec.c:1838 [inline] bprm_execve+0x7ef/0x1970 fs/exec.c:1800 do_execveat_common+0x724/0x890 fs/exec.c:1943 do_execve fs/exec.c:2017 [inline] __do_sys_execve fs/exec.c:2093 [inline] __se_sys_execve fs/exec.c:2088 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:2088 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88801fefe100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ffff88801fefe180: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb >ffff88801fefe200: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ^ ffff88801fefe280: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88801fefe300: 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 ==================================================================

Crashes (10):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Manager	Title
2022/06/12 09:47	linux-next	6d0c80680317	0d5abf15	.config	strace log	report	syz	C		ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/08/07 11:24	linux-next	cb71b93c2dc3	88e3a122	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/08/06 07:09	linux-next	cb71b93c2dc3	e853abd9	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/10 20:22	linux-next	cb71b93c2dc3	b5765a15	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/09 10:24	linux-next	cb71b93c2dc3	b5765a15	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/08 02:53	linux-next	cb71b93c2dc3	bff65f44	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/07/03 04:07	linux-next	cb71b93c2dc3	1434eec0	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/06/30 07:23	linux-next	cb71b93c2dc3	1434eec0	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/06/26 09:47	linux-next	2f9cb3d3bd73	a371c43c	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust
2022/06/12 09:26	linux-next	6d0c80680317	0d5abf15	.config	console log	report			info	ci-upstream-linux-next-kasan-gce-root	KASAN: use-after-free Read in __vma_adjust

Crashes (10):

Assets (help?)