memory leak in kvm_init_stage2_mmu

cheung wall zzqq0103.hey at gmail.com
Tue Mar 12 21:53:52 PDT 2024 

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 <zzqq0103.hey at gmail.com>

----------------------------------------------------------

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  (........ at 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

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