| Description: | In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: fix use-after-free bug The bug can be triggered by sending
a single amdgpu_gem_userptr_ioctl to the AMDGPU DRM driver on any
ASICs with an invalid address and size. The bug was reported by
Joonkyo Jung . For example the following code:
static void Syzkaller1(int fd) { struct drm_amdgpu_gem_userptr arg;
int ret; arg.addr = 0xffffffffffff0000; arg.size = 0x80000000; /*2
Gb*/ arg.flags = 0x7; ret = drmIoctl(fd,
0xc1186451/*amdgpu_gem_userptr_ioctl*/, &arg); } Due to the address
and size are not valid there is a failure in amdgpu_hmm_register->mmu_
interval_notifier_insert->__mmu_interval_notifier_insert->
check_shl_overflow, but we even the amdgpu_hmm_register failure we
still call amdgpu_hmm_unregister into amdgpu_gem_object_free which
causes access to a bad address. The following stack is below when the
issue is reproduced when Kazan is enabled: [ +0.000014] Hardware name:
ASUS System Product Name/ROG STRIX B550-F GAMING (WI-FI), BIOS 1401
12/03/2020 [ +0.000009] RIP:
0010:mmu_interval_notifier_remove+0x327/0x340 [ +0.000017] Code: ff ff
49 89 44 24 08 48 b8 00 01 00 00 00 00 ad de 4c 89 f7 49 89 47 40 48
83 c0 22 49 89 47 48 e8 ce d1 2d 01 e9 32 ff ff ff <0f> 0b e9 16 ff ff
ff 4c 89 ef e8 fa 14 b3 ff e9 36 ff ff ff e8 80 [ +0.000014] RSP:
0018:ffffc90002657988 EFLAGS: 00010246 [ +0.000013] RAX:
0000000000000000 RBX: 1ffff920004caf35 RCX: ffffffff8160565b [
+0.000011] RDX: dffffc0000000000 RSI: 0000000000000004 RDI:
ffff8881a9f78260 [ +0.000010] RBP: ffffc90002657a70 R08:
0000000000000001 R09: fffff520004caf25 [ +0.000010] R10:
0000000000000003 R11: ffffffff8161d1d6 R12: ffff88810e988c00 [
+0.000010] R13: ffff888126fb5a00 R14: ffff88810e988c0c R15:
ffff8881a9f78260 [ +0.000011] FS: 00007ff9ec848540(0000)
GS:ffff8883cc880000(0000) knlGS:0000000000000000 [ +0.000012] CS: 0010
DS: 0000 ES: 0000 CR0: 0000000080050033 [ +0.000010] CR2:
000055b3f7e14328 CR3: 00000001b5770000 CR4: 0000000000350ef0 [
+0.000010] Call Trace: [ +0.000006] [ +0.000007] ?
show_regs+0x6a/0x80 [ +0.000018] ? __warn+0xa5/0x1b0 [ +0.000019] ?
mmu_interval_notifier_remove+0x327/0x340 [ +0.000018] ?
report_bug+0x24a/0x290 [ +0.000022] ? handle_bug+0x46/0x90 [
+0.000015] ? exc_invalid_op+0x19/0x50 [ +0.000016] ?
asm_exc_invalid_op+0x1b/0x20 [ +0.000017] ? kasan_save_stack+0x26/0x50
[ +0.000017] ? mmu_interval_notifier_remove+0x23b/0x340 [ +0.000019] ?
mmu_interval_notifier_remove+0x327/0x340 [ +0.000019] ?
mmu_interval_notifier_remove+0x23b/0x340 [ +0.000020] ?
__pfx_mmu_interval_notifier_remove+0x10/0x10 [ +0.000017] ?
kasan_save_alloc_info+0x1e/0x30 [ +0.000018] ?
srso_return_thunk+0x5/0x5f [ +0.000014] ? __kasan_kmalloc+0xb1/0xc0 [
+0.000018] ? srso_return_thunk+0x5/0x5f [ +0.000013] ?
__kasan_check_read+0x11/0x20 [ +0.000020]
amdgpu_hmm_unregister+0x34/0x50 [amdgpu] [ +0.004695]
amdgpu_gem_object_free+0x66/0xa0 [amdgpu] [ +0.004534] ?
__pfx_amdgpu_gem_object_free+0x10/0x10 [amdgpu] [ +0.004291] ?
do_syscall_64+0x5f/0xe0 [ +0.000023] ? srso_return_thunk+0x5/0x5f [
+0.000017] drm_gem_object_free+0x3b/0x50 [drm] [ +0.000489]
amdgpu_gem_userptr_ioctl+0x306/0x500 [amdgpu] [ +0.004295] ?
__pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu] [ +0.004270] ?
srso_return_thunk+0x5/0x5f [ +0.000014] ?
__this_cpu_preempt_check+0x13/0x20 [ +0.000015] ?
srso_return_thunk+0x5/0x5f [ +0.000013] ?
sysvec_apic_timer_interrupt+0x57/0xc0 [ +0.000020] ?
srso_return_thunk+0x5/0x5f [ +0.000014] ?
asm_sysvec_apic_timer_interrupt+0x1b/0x20 [ +0.000022] ?
drm_ioctl_kernel+0x17b/0x1f0 [drm] [ +0.000496] ?
__pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu] [ +0.004272] ?
drm_ioctl_kernel+0x190/0x1f0 [drm] [ +0.000492]
drm_ioctl_kernel+0x140/0x1f0 [drm] [ +0.000497] ?
__pfx_amdgpu_gem_userptr_ioctl+0x10/0x10 [amdgpu] [ +0.004297] ?
__pfx_drm_ioctl_kernel+0x10/0x10 [d ---truncated---
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