Re: [PATCH] MIPS: KVM: Fix NULL pointer dereference

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On Mon, Jun 26, 2023 at 9:59 AM Huacai Chen <chenhuacai@xxxxxxxxxxx> wrote:
>
> After commit 45c7e8af4a5e3f0bea4ac209 ("MIPS: Remove KVM_TE support") we
> get a NULL pointer dereference when creating a KVM guest:

To be honest, a bug that needed 2 years to be reproduced is probably a
sign that KVM/MIPS has no users. Any objections to removing it
altogether?

Paolo

>
> [  146.243409] Starting KVM with MIPS VZ extensions
> [  149.849151] CPU 3 Unable to handle kernel paging request at virtual address 0000000000000300, epc == ffffffffc06356ec, ra == ffffffffc063568c
> [  149.849177] Oops[#1]:
> [  149.849182] CPU: 3 PID: 2265 Comm: qemu-system-mip Not tainted 6.4.0-rc3+ #1671
> [  149.849188] Hardware name: THTF CX TL630 Series/THTF-LS3A4000-7A1000-ML4A, BIOS KL4.1F.TF.D.166.201225.R 12/25/2020
> [  149.849192] $ 0   : 0000000000000000 000000007400cce0 0000000000400004 ffffffff8119c740
> [  149.849209] $ 4   : 000000007400cce1 000000007400cce1 0000000000000000 0000000000000000
> [  149.849221] $ 8   : 000000240058bb36 ffffffff81421ac0 0000000000000000 0000000000400dc0
> [  149.849233] $12   : 9800000102a07cc8 ffffffff80e40e38 0000000000000001 0000000000400dc0
> [  149.849245] $16   : 0000000000000000 9800000106cd0000 9800000106cd0000 9800000100cce000
> [  149.849257] $20   : ffffffffc0632b28 ffffffffc05b31b0 9800000100ccca00 0000000000400000
> [  149.849269] $24   : 9800000106cd09ce ffffffff802f69d0
> [  149.849281] $28   : 9800000102a04000 9800000102a07cd0 98000001106a8000 ffffffffc063568c
> [  149.849293] Hi    : 00000335b2111e66
> [  149.849295] Lo    : 6668d90061ae0ae9
> [  149.849298] epc   : ffffffffc06356ec kvm_vz_vcpu_setup+0xc4/0x328 [kvm]
> [  149.849324] ra    : ffffffffc063568c kvm_vz_vcpu_setup+0x64/0x328 [kvm]
> [  149.849336] Status: 7400cce3 KX SX UX KERNEL EXL IE
> [  149.849351] Cause : 1000000c (ExcCode 03)
> [  149.849354] BadVA : 0000000000000300
> [  149.849357] PrId  : 0014c004 (ICT Loongson-3)
> [  149.849360] Modules linked in: kvm nfnetlink_queue nfnetlink_log nfnetlink fuse sha256_generic libsha256 cfg80211 rfkill binfmt_misc vfat fat snd_hda_codec_hdmi input_leds led_class snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_pcm snd_timer snd serio_raw xhci_pci radeon drm_suballoc_helper drm_display_helper xhci_hcd ip_tables x_tables
> [  149.849432] Process qemu-system-mip (pid: 2265, threadinfo=00000000ae2982d2, task=0000000038e09ad4, tls=000000ffeba16030)
> [  149.849439] Stack : 9800000000000003 9800000100ccca00 9800000100ccc000 ffffffffc062cef4
> [  149.849453]         9800000102a07d18 c89b63a7ab338e00 0000000000000000 ffffffff811a0000
> [  149.849465]         0000000000000000 9800000106cd0000 ffffffff80e59938 98000001106a8920
> [  149.849476]         ffffffff80e57f30 ffffffffc062854c ffffffff811a0000 9800000102bf4240
> [  149.849488]         ffffffffc05b0000 ffffffff80e3a798 000000ff78000000 000000ff78000010
> [  149.849500]         0000000000000255 98000001021f7de0 98000001023f0078 ffffffff81434000
> [  149.849511]         0000000000000000 0000000000000000 9800000102ae0000 980000025e92ae28
> [  149.849523]         0000000000000000 c89b63a7ab338e00 0000000000000001 ffffffff8119dce0
> [  149.849535]         000000ff78000010 ffffffff804f3d3c 9800000102a07eb0 0000000000000255
> [  149.849546]         0000000000000000 ffffffff8049460c 000000ff78000010 0000000000000255
> [  149.849558]         ...
> [  149.849565] Call Trace:
> [  149.849567] [<ffffffffc06356ec>] kvm_vz_vcpu_setup+0xc4/0x328 [kvm]
> [  149.849586] [<ffffffffc062cef4>] kvm_arch_vcpu_create+0x184/0x228 [kvm]
> [  149.849605] [<ffffffffc062854c>] kvm_vm_ioctl+0x64c/0xf28 [kvm]
> [  149.849623] [<ffffffff805209c0>] sys_ioctl+0xc8/0x118
> [  149.849631] [<ffffffff80219eb0>] syscall_common+0x34/0x58
>
> The root cause is the deletion of kvm_mips_commpage_init() leaves vcpu->
> arch.cop0 NULL. So fix it by make cop0 from a pointer to an embed object.
>
> Fixes: 45c7e8af4a5e3f0bea4ac209 ("MIPS: Remove KVM_TE support")
> Cc: stable@xxxxxxxxxxxxxxx
> Suggested-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
> Signed-off-by: Huacai Chen <chenhuacai@xxxxxxxxxxx>
> ---
>  arch/mips/include/asm/kvm_host.h |  6 +++---
>  arch/mips/kvm/emulate.c          | 22 +++++++++++-----------
>  arch/mips/kvm/mips.c             | 16 ++++++++--------
>  arch/mips/kvm/trace.h            |  8 ++++----
>  arch/mips/kvm/vz.c               | 20 ++++++++++----------
>  5 files changed, 36 insertions(+), 36 deletions(-)
>
> diff --git a/arch/mips/include/asm/kvm_host.h b/arch/mips/include/asm/kvm_host.h
> index 957121a495f0..04cedf9f8811 100644
> --- a/arch/mips/include/asm/kvm_host.h
> +++ b/arch/mips/include/asm/kvm_host.h
> @@ -317,7 +317,7 @@ struct kvm_vcpu_arch {
>         unsigned int aux_inuse;
>
>         /* COP0 State */
> -       struct mips_coproc *cop0;
> +       struct mips_coproc cop0;
>
>         /* Resume PC after MMIO completion */
>         unsigned long io_pc;
> @@ -698,7 +698,7 @@ static inline bool kvm_mips_guest_can_have_fpu(struct kvm_vcpu_arch *vcpu)
>  static inline bool kvm_mips_guest_has_fpu(struct kvm_vcpu_arch *vcpu)
>  {
>         return kvm_mips_guest_can_have_fpu(vcpu) &&
> -               kvm_read_c0_guest_config1(vcpu->cop0) & MIPS_CONF1_FP;
> +               kvm_read_c0_guest_config1(&vcpu->cop0) & MIPS_CONF1_FP;
>  }
>
>  static inline bool kvm_mips_guest_can_have_msa(struct kvm_vcpu_arch *vcpu)
> @@ -710,7 +710,7 @@ static inline bool kvm_mips_guest_can_have_msa(struct kvm_vcpu_arch *vcpu)
>  static inline bool kvm_mips_guest_has_msa(struct kvm_vcpu_arch *vcpu)
>  {
>         return kvm_mips_guest_can_have_msa(vcpu) &&
> -               kvm_read_c0_guest_config3(vcpu->cop0) & MIPS_CONF3_MSA;
> +               kvm_read_c0_guest_config3(&vcpu->cop0) & MIPS_CONF3_MSA;
>  }
>
>  struct kvm_mips_callbacks {
> diff --git a/arch/mips/kvm/emulate.c b/arch/mips/kvm/emulate.c
> index edaec93a1a1f..e64372b8f66a 100644
> --- a/arch/mips/kvm/emulate.c
> +++ b/arch/mips/kvm/emulate.c
> @@ -312,7 +312,7 @@ int kvm_get_badinstrp(u32 *opc, struct kvm_vcpu *vcpu, u32 *out)
>   */
>  int kvm_mips_count_disabled(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>
>         return  (vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC) ||
>                 (kvm_read_c0_guest_cause(cop0) & CAUSEF_DC);
> @@ -384,7 +384,7 @@ static inline ktime_t kvm_mips_count_time(struct kvm_vcpu *vcpu)
>   */
>  static u32 kvm_mips_read_count_running(struct kvm_vcpu *vcpu, ktime_t now)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         ktime_t expires, threshold;
>         u32 count, compare;
>         int running;
> @@ -444,7 +444,7 @@ static u32 kvm_mips_read_count_running(struct kvm_vcpu *vcpu, ktime_t now)
>   */
>  u32 kvm_mips_read_count(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>
>         /* If count disabled just read static copy of count */
>         if (kvm_mips_count_disabled(vcpu))
> @@ -502,7 +502,7 @@ ktime_t kvm_mips_freeze_hrtimer(struct kvm_vcpu *vcpu, u32 *count)
>  static void kvm_mips_resume_hrtimer(struct kvm_vcpu *vcpu,
>                                     ktime_t now, u32 count)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         u32 compare;
>         u64 delta;
>         ktime_t expire;
> @@ -603,7 +603,7 @@ int kvm_mips_restore_hrtimer(struct kvm_vcpu *vcpu, ktime_t before,
>   */
>  void kvm_mips_write_count(struct kvm_vcpu *vcpu, u32 count)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         ktime_t now;
>
>         /* Calculate bias */
> @@ -649,7 +649,7 @@ void kvm_mips_init_count(struct kvm_vcpu *vcpu, unsigned long count_hz)
>   */
>  int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         int dc;
>         ktime_t now;
>         u32 count;
> @@ -696,7 +696,7 @@ int kvm_mips_set_count_hz(struct kvm_vcpu *vcpu, s64 count_hz)
>   */
>  void kvm_mips_write_compare(struct kvm_vcpu *vcpu, u32 compare, bool ack)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         int dc;
>         u32 old_compare = kvm_read_c0_guest_compare(cop0);
>         s32 delta = compare - old_compare;
> @@ -779,7 +779,7 @@ void kvm_mips_write_compare(struct kvm_vcpu *vcpu, u32 compare, bool ack)
>   */
>  static ktime_t kvm_mips_count_disable(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         u32 count;
>         ktime_t now;
>
> @@ -806,7 +806,7 @@ static ktime_t kvm_mips_count_disable(struct kvm_vcpu *vcpu)
>   */
>  void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>
>         kvm_set_c0_guest_cause(cop0, CAUSEF_DC);
>         if (!(vcpu->arch.count_ctl & KVM_REG_MIPS_COUNT_CTL_DC))
> @@ -826,7 +826,7 @@ void kvm_mips_count_disable_cause(struct kvm_vcpu *vcpu)
>   */
>  void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         u32 count;
>
>         kvm_clear_c0_guest_cause(cop0, CAUSEF_DC);
> @@ -852,7 +852,7 @@ void kvm_mips_count_enable_cause(struct kvm_vcpu *vcpu)
>   */
>  int kvm_mips_set_count_ctl(struct kvm_vcpu *vcpu, s64 count_ctl)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         s64 changed = count_ctl ^ vcpu->arch.count_ctl;
>         s64 delta;
>         ktime_t expire, now;
> diff --git a/arch/mips/kvm/mips.c b/arch/mips/kvm/mips.c
> index 884be4ef99dc..aa5583a7b05b 100644
> --- a/arch/mips/kvm/mips.c
> +++ b/arch/mips/kvm/mips.c
> @@ -649,7 +649,7 @@ static int kvm_mips_copy_reg_indices(struct kvm_vcpu *vcpu, u64 __user *indices)
>  static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
>                             const struct kvm_one_reg *reg)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         struct mips_fpu_struct *fpu = &vcpu->arch.fpu;
>         int ret;
>         s64 v;
> @@ -761,7 +761,7 @@ static int kvm_mips_get_reg(struct kvm_vcpu *vcpu,
>  static int kvm_mips_set_reg(struct kvm_vcpu *vcpu,
>                             const struct kvm_one_reg *reg)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         struct mips_fpu_struct *fpu = &vcpu->arch.fpu;
>         s64 v;
>         s64 vs[2];
> @@ -1086,7 +1086,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
>  int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
>  {
>         return kvm_mips_pending_timer(vcpu) ||
> -               kvm_read_c0_guest_cause(vcpu->arch.cop0) & C_TI;
> +               kvm_read_c0_guest_cause(&vcpu->arch.cop0) & C_TI;
>  }
>
>  int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
> @@ -1110,7 +1110,7 @@ int kvm_arch_vcpu_dump_regs(struct kvm_vcpu *vcpu)
>         kvm_debug("\thi: 0x%08lx\n", vcpu->arch.hi);
>         kvm_debug("\tlo: 0x%08lx\n", vcpu->arch.lo);
>
> -       cop0 = vcpu->arch.cop0;
> +       cop0 = &vcpu->arch.cop0;
>         kvm_debug("\tStatus: 0x%08x, Cause: 0x%08x\n",
>                   kvm_read_c0_guest_status(cop0),
>                   kvm_read_c0_guest_cause(cop0));
> @@ -1232,7 +1232,7 @@ static int __kvm_mips_handle_exit(struct kvm_vcpu *vcpu)
>
>         case EXCCODE_TLBS:
>                 kvm_debug("TLB ST fault:  cause %#x, status %#x, PC: %p, BadVaddr: %#lx\n",
> -                         cause, kvm_read_c0_guest_status(vcpu->arch.cop0), opc,
> +                         cause, kvm_read_c0_guest_status(&vcpu->arch.cop0), opc,
>                           badvaddr);
>
>                 ++vcpu->stat.tlbmiss_st_exits;
> @@ -1304,7 +1304,7 @@ static int __kvm_mips_handle_exit(struct kvm_vcpu *vcpu)
>                 kvm_get_badinstr(opc, vcpu, &inst);
>                 kvm_err("Exception Code: %d, not yet handled, @ PC: %p, inst: 0x%08x  BadVaddr: %#lx Status: %#x\n",
>                         exccode, opc, inst, badvaddr,
> -                       kvm_read_c0_guest_status(vcpu->arch.cop0));
> +                       kvm_read_c0_guest_status(&vcpu->arch.cop0));
>                 kvm_arch_vcpu_dump_regs(vcpu);
>                 run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
>                 ret = RESUME_HOST;
> @@ -1377,7 +1377,7 @@ int noinstr kvm_mips_handle_exit(struct kvm_vcpu *vcpu)
>  /* Enable FPU for guest and restore context */
>  void kvm_own_fpu(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         unsigned int sr, cfg5;
>
>         preempt_disable();
> @@ -1421,7 +1421,7 @@ void kvm_own_fpu(struct kvm_vcpu *vcpu)
>  /* Enable MSA for guest and restore context */
>  void kvm_own_msa(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         unsigned int sr, cfg5;
>
>         preempt_disable();
> diff --git a/arch/mips/kvm/trace.h b/arch/mips/kvm/trace.h
> index a8c7fd7bf6d2..136c3535a1cb 100644
> --- a/arch/mips/kvm/trace.h
> +++ b/arch/mips/kvm/trace.h
> @@ -322,11 +322,11 @@ TRACE_EVENT_FN(kvm_guest_mode_change,
>             ),
>
>             TP_fast_assign(
> -                       __entry->epc = kvm_read_c0_guest_epc(vcpu->arch.cop0);
> +                       __entry->epc = kvm_read_c0_guest_epc(&vcpu->arch.cop0);
>                         __entry->pc = vcpu->arch.pc;
> -                       __entry->badvaddr = kvm_read_c0_guest_badvaddr(vcpu->arch.cop0);
> -                       __entry->status = kvm_read_c0_guest_status(vcpu->arch.cop0);
> -                       __entry->cause = kvm_read_c0_guest_cause(vcpu->arch.cop0);
> +                       __entry->badvaddr = kvm_read_c0_guest_badvaddr(&vcpu->arch.cop0);
> +                       __entry->status = kvm_read_c0_guest_status(&vcpu->arch.cop0);
> +                       __entry->cause = kvm_read_c0_guest_cause(&vcpu->arch.cop0);
>             ),
>
>             TP_printk("EPC: 0x%08lx PC: 0x%08lx Status: 0x%08x Cause: 0x%08x BadVAddr: 0x%08lx",
> diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c
> index 3d21cbfa7443..99d5a71e4300 100644
> --- a/arch/mips/kvm/vz.c
> +++ b/arch/mips/kvm/vz.c
> @@ -422,7 +422,7 @@ static void _kvm_vz_restore_htimer(struct kvm_vcpu *vcpu,
>   */
>  static void kvm_vz_restore_timer(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         u32 cause, compare;
>
>         compare = kvm_read_sw_gc0_compare(cop0);
> @@ -517,7 +517,7 @@ static void _kvm_vz_save_htimer(struct kvm_vcpu *vcpu,
>   */
>  static void kvm_vz_save_timer(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         u32 gctl0, compare, cause;
>
>         gctl0 = read_c0_guestctl0();
> @@ -863,7 +863,7 @@ static unsigned long mips_process_maar(unsigned int op, unsigned long val)
>
>  static void kvm_write_maari(struct kvm_vcpu *vcpu, unsigned long val)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>
>         val &= MIPS_MAARI_INDEX;
>         if (val == MIPS_MAARI_INDEX)
> @@ -876,7 +876,7 @@ static enum emulation_result kvm_vz_gpsi_cop0(union mips_instruction inst,
>                                               u32 *opc, u32 cause,
>                                               struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         enum emulation_result er = EMULATE_DONE;
>         u32 rt, rd, sel;
>         unsigned long curr_pc;
> @@ -1911,7 +1911,7 @@ static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
>                               const struct kvm_one_reg *reg,
>                               s64 *v)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         unsigned int idx;
>
>         switch (reg->id) {
> @@ -2081,7 +2081,7 @@ static int kvm_vz_get_one_reg(struct kvm_vcpu *vcpu,
>         case KVM_REG_MIPS_CP0_MAARI:
>                 if (!cpu_guest_has_maar || cpu_guest_has_dyn_maar)
>                         return -EINVAL;
> -               *v = kvm_read_sw_gc0_maari(vcpu->arch.cop0);
> +               *v = kvm_read_sw_gc0_maari(&vcpu->arch.cop0);
>                 break;
>  #ifdef CONFIG_64BIT
>         case KVM_REG_MIPS_CP0_XCONTEXT:
> @@ -2135,7 +2135,7 @@ static int kvm_vz_set_one_reg(struct kvm_vcpu *vcpu,
>                               const struct kvm_one_reg *reg,
>                               s64 v)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         unsigned int idx;
>         int ret = 0;
>         unsigned int cur, change;
> @@ -2562,7 +2562,7 @@ static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *vcpu, int cpu)
>
>  static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         bool migrated, all;
>
>         /*
> @@ -2704,7 +2704,7 @@ static int kvm_vz_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
>
>  static int kvm_vz_vcpu_put(struct kvm_vcpu *vcpu, int cpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>
>         if (current->flags & PF_VCPU)
>                 kvm_vz_vcpu_save_wired(vcpu);
> @@ -3076,7 +3076,7 @@ static void kvm_vz_vcpu_uninit(struct kvm_vcpu *vcpu)
>
>  static int kvm_vz_vcpu_setup(struct kvm_vcpu *vcpu)
>  {
> -       struct mips_coproc *cop0 = vcpu->arch.cop0;
> +       struct mips_coproc *cop0 = &vcpu->arch.cop0;
>         unsigned long count_hz = 100*1000*1000; /* default to 100 MHz */
>
>         /*
> --
> 2.39.3
>





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