Jack Wang eff3a54aae KVM: nVMX: handle page fault in vmread fix ... During backport f7eea636c3 ("KVM: nVMX: handle page fault in vmread"), there was a mistake the exception reference should be passed to function kvm_write_guest_virt_system, instead of NULL, other wise, we will get NULL pointer deref, eg kvm-unit-test triggered a NULL pointer deref below: [ 948.518437] kvm [24114]: vcpu0, guest rIP: 0x407ef9 kvm_set_msr_common: MSR_IA32_DEBUGCTLMSR 0x3, nop [ 949.106464] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 949.106707] PGD 0 P4D 0 [ 949.106872] Oops: 0002 [#1] SMP [ 949.107038] CPU: 2 PID: 24126 Comm: qemu-2.7 Not tainted 4.19.77-pserver #4.19.77-1+feature+daily+update+20191005.1625+a4168bb~deb9 [ 949.107283] Hardware name: Dell Inc. Precision Tower 3620/09WH54, BIOS 2.7.3 01/31/2018 [ 949.107549] RIP: 0010:kvm_write_guest_virt_system+0x12/0x40 [kvm] [ 949.107719] Code: c0 5d 41 5c 41 5d 41 5e 83 f8 03 41 0f 94 c0 41 c1 e0 02 e9 b0 ed ff ff 0f 1f 44 00 00 48 89 f0 c6 87 59 56 00 00 01 48 89 d6 <49> c7 00 00 00 00 00 89 ca 49 c7 40 08 00 00 00 00 49 c7 40 10 00 [ 949.108044] RSP: 0018:ffffb31b0a953cb0 EFLAGS: 00010202 [ 949.108216] RAX: 000000000046b4d8 RBX: ffff9e9f415b0000 RCX: 0000000000000008 [ 949.108389] RDX: ffffb31b0a953cc0 RSI: ffffb31b0a953cc0 RDI: ffff9e9f415b0000 [ 949.108562] RBP: 00000000d2e14928 R08: 0000000000000000 R09: 0000000000000000 [ 949.108733] R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffffffffc8 [ 949.108907] R13: 0000000000000002 R14: ffff9e9f4f26f2e8 R15: 0000000000000000 [ 949.109079] FS: 00007eff8694c700(0000) GS:ffff9e9f51a80000(0000) knlGS:0000000031415928 [ 949.109318] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 949.109495] CR2: 0000000000000000 CR3: 00000003be53b002 CR4: 00000000003626e0 [ 949.109671] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 949.109845] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 949.110017] Call Trace: [ 949.110186] handle_vmread+0x22b/0x2f0 [kvm_intel] [ 949.110356] ? vmexit_fill_RSB+0xc/0x30 [kvm_intel] [ 949.110549] kvm_arch_vcpu_ioctl_run+0xa98/0x1b30 [kvm] [ 949.110725] ? kvm_vcpu_ioctl+0x388/0x5d0 [kvm] [ 949.110901] kvm_vcpu_ioctl+0x388/0x5d0 [kvm] [ 949.111072] do_vfs_ioctl+0xa2/0x620 Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com>		2019-10-11 18:20:45 +02:00
..
alpha	alpha: Fix Eiger NR_IRQS to 128	2019-02-20 10:25:47 +01:00
arc	ARC: mm: SIGSEGV userspace trying to access kernel virtual memory	2019-09-16 08:22:14 +02:00
arm	arm: use STACK_TOP when computing mmap base address	2019-10-07 18:57:18 +02:00
arm64	arm64: consider stack randomization for mmap base only when necessary	2019-10-07 18:57:17 +02:00
c6x	kbuild: rename LDFLAGS to KBUILD_LDFLAGS	2018-08-24 08:22:08 +09:00
h8300	h8300: use cc-cross-prefix instead of hardcoding h8300-unknown-linux-	2019-04-05 22:32:55 +02:00
hexagon	hexagon: modify ffs() and fls() to return int	2018-09-10 19:42:15 -05:00
ia64	ia64:unwind: fix double free for mod->arch.init_unw_table	2019-10-05 13:09:38 +02:00
m68k	m68k: Prevent some compiler warnings in Coldfire builds	2019-10-05 13:09:43 +02:00
microblaze	mm: make the __PAGETABLE_PxD_FOLDED defines non-empty	2018-12-29 13:37:57 +01:00
mips	mips: properly account for stack randomization and stack guard gap	2019-10-07 18:57:18 +02:00
nds32	nds32: Fix gcc 8.0 compiler option incompatible.	2019-02-12 19:46:57 +01:00
nios2	nios2: kconfig: remove duplicate DEBUG_STACK_USAGE symbol defintions	2018-08-27 09:47:20 +08:00
openrisc	OpenRISC updates for 4.19	2018-08-23 14:09:37 -07:00
parisc	parisc: Fix build of compressed kernel even with debug enabled	2019-08-06 19:06:55 +02:00
powerpc	KVM: PPC: Book3S HV: Don't lose pending doorbell request on migration on P9	2019-10-11 18:20:44 +02:00
riscv	riscv: remove unused variable in ftrace	2019-09-16 08:21:44 +02:00
s390	s390/topology: avoid firing events before kobjs are created	2019-10-11 18:20:42 +02:00
sh	sh: kernel: hw_breakpoint: Fix missing break in switch statement	2019-08-25 10:47:42 +02:00
sparc	sparc: perf: fix updated event period in response to PERF_EVENT_IOC_PERIOD	2019-06-25 11:35:57 +08:00
um	um: Silence lockdep complaint about mmap_sem	2019-07-31 07:27:04 +02:00
unicore32	mm: convert return type of handle_mm_fault() caller to vm_fault_t	2018-08-17 16:20:28 -07:00
x86	KVM: nVMX: handle page fault in vmread fix	2019-10-11 18:20:45 +02:00
xtensa	xtensa: add missing isync to the cpu_reset TLB code	2019-08-25 10:47:47 +02:00
.gitignore
Kconfig	jump_label: move 'asm goto' support test to Kconfig	2019-06-04 08:02:34 +02:00