[PATCH] MIPS: KVM: Fix NULL pointer dereference - Linux-stable-mirror

26 Jun 2023

After commit 45c7e8af4a5e3f0bea4ac209 ("MIPS: Remove KVM_TE support") we
get a NULL pointer dereference when creating a KVM guest:
[  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@vger.kernel.org
Suggested-by: Thomas Bogendoerfer tsbogend@alpha.franken.de
Signed-off-by: Huacai Chen chenhuacai@loongson.cn
---
 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


    