Hello,
when using Syzkaller to fuzz the latest Linux Kernel arm64 version,
the following crash
was triggered on:
HEAD commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a (tag: v6.7)
git tree: upstream
console output: https://pastebin.com/raw/MLVZbN01
kernel config: https://pastebin.com/raw/PFD96ZwE
C reproducer: https://pastebin.com/raw/rHmMzvGt
Syzlang reproducer: https://pastebin.com/raw/dAt714WD
If you fix this issue, please add the following tag to the commit:
Reported-by: Qiang Zhang <[email protected]>
----------------------------------------------------------
2024/03/05 18:24:34 executed programs: 0
2024/03/05 18:26:41 executed programs: 8
BUG: memory leak
unreferenced object 0xffff023ad74b8100 (size 128):
comm "syz-executor.3", pid 3911, jiffies 4295149819 (age 22.132s)
hex dump (first 32 bytes):
28 00 00 00 01 00 00 00 00 40 4e d7 3a 02 ff ff (........@N.:...
80 d9 5f a4 48 d3 ff ff c8 69 46 d7 3a 02 ff ff .._.H....iF.:...
backtrace:
[<000000008d295845>] kmemleak_alloc_recursive
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/kmemleak.h:42
[inline]
[<000000008d295845>] slab_post_alloc_hook
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slab.h:740
[inline]
[<000000008d295845>] slab_alloc_node
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slub.c:3398
[inline]
[<000000008d295845>] __kmem_cache_alloc_node+0x1f4/0x320
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slub.c:3437
[<000000003fbdfe35>] kmalloc_trace+0x44/0x6c
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slab_common.c:1045
[<00000000a94cbf84>] kmalloc
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/slab.h:553
[inline]
[<00000000a94cbf84>] kzalloc
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/slab.h:689
[inline]
[<00000000a94cbf84>] kvm_init_stage2_mmu+0x88/0x450
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/mmu.c:712
[<00000000d7d73550>] kvm_arch_init_vm+0x6c/0x2d0
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/arm.c:145
[<000000001e472e33>] kvm_create_vm
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/../../../virt/kvm/kvm_main.c:1219
[inline]
[<000000001e472e33>] kvm_dev_ioctl_create_vm
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/../../../virt/kvm/kvm_main.c:5009
[inline]
[<000000001e472e33>] kvm_dev_ioctl+0x790/0x158c
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/../../../virt/kvm/kvm_main.c:5051
[<000000005f1541e3>] vfs_ioctl
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:51
[inline]
[<000000005f1541e3>] __do_sys_ioctl
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:870
[inline]
[<000000005f1541e3>] __se_sys_ioctl
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:856
[inline]
[<000000005f1541e3>] __arm64_sys_ioctl+0x17c/0x204
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:856
[<00000000721fb6b6>] __invoke_syscall
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:38
[inline]
[<00000000721fb6b6>] invoke_syscall+0x84/0x2d0
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:52
[<00000000718e28b1>] el0_svc_common.constprop.0+0xe8/0x2e4
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:142
[<000000001553392f>] do_el0_svc+0x64/0x1fc
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:206
[<00000000585b9848>] el0_svc+0x2c/0x6c
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/entry-common.c:637
[<0000000051149d12>] el0t_64_sync_handler+0xf4/0x120
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/entry-common.c:655
[<00000000decfe0e2>] el0t_64_sync+0x18c/0x190
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/entry.S:585
BUG: memory leak
unreferenced object 0xffff023ad0484d00 (size 128):
comm "syz-executor.2", pid 3935, jiffies 4295150036 (age 21.268s)
hex dump (first 32 bytes):
28 00 00 00 01 00 00 00 00 00 13 c7 3a 02 ff ff (...........:...
80 d9 5f a4 48 d3 ff ff c8 a9 c3 cd 3a 02 ff ff .._.H.......:...
backtrace:
[<000000008d295845>] kmemleak_alloc_recursive
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/kmemleak.h:42
[inline]
[<000000008d295845>] slab_post_alloc_hook
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slab.h:740
[inline]
[<000000008d295845>] slab_alloc_node
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slub.c:3398
[inline]
[<000000008d295845>] __kmem_cache_alloc_node+0x1f4/0x320
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slub.c:3437
[<000000003fbdfe35>] kmalloc_trace+0x44/0x6c
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/mm/slab_common.c:1045
[<00000000a94cbf84>] kmalloc
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/slab.h:553
[inline]
[<00000000a94cbf84>] kzalloc
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/slab.h:689
[inline]
[<00000000a94cbf84>] kvm_init_stage2_mmu+0x88/0x450
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/mmu.c:712
[<00000000d7d73550>] kvm_arch_init_vm+0x6c/0x2d0
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/arm.c:145
[<000000001e472e33>] kvm_create_vm
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/../../../virt/kvm/kvm_main.c:1219
[inline]
[<000000001e472e33>] kvm_dev_ioctl_create_vm
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/../../../virt/kvm/kvm_main.c:5009
[inline]
[<000000001e472e33>] kvm_dev_ioctl+0x790/0x158c
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kvm/../../../virt/kvm/kvm_main.c:5051
[<000000005f1541e3>] vfs_ioctl
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:51
[inline]
[<000000005f1541e3>] __do_sys_ioctl
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:870
[inline]
[<000000005f1541e3>] __se_sys_ioctl
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:856
[inline]
[<000000005f1541e3>] __arm64_sys_ioctl+0x17c/0x204
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/fs/ioctl.c:856
[<00000000721fb6b6>] __invoke_syscall
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:38
[inline]
[<00000000721fb6b6>] invoke_syscall+0x84/0x2d0
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:52
[<00000000718e28b1>] el0_svc_common.constprop.0+0xe8/0x2e4
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:142
[<000000001553392f>] do_el0_svc+0x64/0x1fc
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/syscall.c:206
[<00000000585b9848>] el0_svc+0x2c/0x6c
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/entry-common.c:637
[<0000000051149d12>] el0t_64_sync_handler+0xf4/0x120
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/entry-common.c:655
[<00000000decfe0e2>] el0t_64_sync+0x18c/0x190
data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/arch/arm64/kernel/entry.S:585
On Wed, 13 Mar 2024 04:53:52 +0000,
cheung wall <[email protected]> wrote:
>
> Hello,
>
> when using Syzkaller to fuzz the latest Linux Kernel arm64 version,
> the following crash
>
> was triggered on:
>
>
> HEAD commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a (tag: v6.7)
>
> git tree: upstream
>
> console output: https://pastebin.com/raw/MLVZbN01
This reports "Forbidden".
> kernel config: https://pastebin.com/raw/PFD96ZwE
# CONFIG_KVM is not set
How do you expect this to work?
>
> C reproducer: https://pastebin.com/raw/rHmMzvGt
>
> Syzlang reproducer: https://pastebin.com/raw/dAt714WD
>
>
> If you fix this issue, please add the following tag to the commit:
>
> Reported-by: Qiang Zhang <[email protected]>
>
> ----------------------------------------------------------
>
> 2024/03/05 18:24:34 executed programs: 0
> 2024/03/05 18:26:41 executed programs: 8
> BUG: memory leak
> unreferenced object 0xffff023ad74b8100 (size 128):
> comm "syz-executor.3", pid 3911, jiffies 4295149819 (age 22.132s)
> hex dump (first 32 bytes):
> 28 00 00 00 01 00 00 00 00 40 4e d7 3a 02 ff ff (........@N.:...
> 80 d9 5f a4 48 d3 ff ff c8 69 46 d7 3a 02 ff ff .._.H....iF.:...
> backtrace:
> [<000000008d295845>] kmemleak_alloc_recursive
> data/embfuzz/emblinux/linux-4a61839152cc3e9e00ac059d73a28d148d622b30/./include/linux/kmemleak.h:42
[...]
I suspect this report suffers from the same problem as the other one,
where this is actually against 6.1.61 rather than 6.7 as advertised?
I ran the reproducer locally on 6.8, and didn't observe any failure. I
had to modify the it though, as I'm using a host with 16kB page size.
Please let me know if I'm missing something.
M.
--
Without deviation from the norm, progress is not possible.