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-rw-r--r--arch/x86/kernel/cpu/centaur.c1
-rw-r--r--arch/x86/kernel/cpu/common.c24
-rw-r--r--arch/x86/kernel/cpu/cpu.h4
-rw-r--r--arch/x86/kernel/cpu/mce/core.c2
-rw-r--r--arch/x86/kernel/cpu/resctrl/core.c8
-rw-r--r--arch/x86/kernel/cpu/resctrl/internal.h1
-rw-r--r--arch/x86/kernel/cpu/resctrl/rdtgroup.c1
-rw-r--r--arch/x86/kernel/cpu/umwait.c6
-rw-r--r--arch/x86/kernel/cpu/zhaoxin.c1
-rw-r--r--arch/x86/kernel/dumpstack.c2
-rw-r--r--arch/x86/kernel/ftrace.c10
-rw-r--r--arch/x86/kernel/kgdb.c6
-rw-r--r--arch/x86/kernel/kprobes/core.c21
-rw-r--r--arch/x86/kernel/kprobes/opt.c2
-rw-r--r--arch/x86/kernel/nmi.c2
-rw-r--r--arch/x86/kernel/probe_roms.c24
-rw-r--r--arch/x86/kernel/traps.c81
17 files changed, 93 insertions, 103 deletions
diff --git a/arch/x86/kernel/cpu/centaur.c b/arch/x86/kernel/cpu/centaur.c
index 426792565d86..c5cf336e5077 100644
--- a/arch/x86/kernel/cpu/centaur.c
+++ b/arch/x86/kernel/cpu/centaur.c
@@ -3,6 +3,7 @@
#include <linux/sched.h>
#include <linux/sched/clock.h>
+#include <asm/cpu.h>
#include <asm/cpufeature.h>
#include <asm/e820/api.h>
#include <asm/mtrr.h>
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 043d93cdcaad..95c090a45b4b 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -347,6 +347,9 @@ out:
cr4_clear_bits(X86_CR4_UMIP);
}
+/* These bits should not change their value after CPU init is finished. */
+static const unsigned long cr4_pinned_mask =
+ X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_UMIP | X86_CR4_FSGSBASE;
static DEFINE_STATIC_KEY_FALSE_RO(cr_pinning);
static unsigned long cr4_pinned_bits __ro_after_init;
@@ -371,20 +374,20 @@ EXPORT_SYMBOL(native_write_cr0);
void native_write_cr4(unsigned long val)
{
- unsigned long bits_missing = 0;
+ unsigned long bits_changed = 0;
set_register:
asm volatile("mov %0,%%cr4": "+r" (val), "+m" (cr4_pinned_bits));
if (static_branch_likely(&cr_pinning)) {
- if (unlikely((val & cr4_pinned_bits) != cr4_pinned_bits)) {
- bits_missing = ~val & cr4_pinned_bits;
- val |= bits_missing;
+ if (unlikely((val & cr4_pinned_mask) != cr4_pinned_bits)) {
+ bits_changed = (val & cr4_pinned_mask) ^ cr4_pinned_bits;
+ val = (val & ~cr4_pinned_mask) | cr4_pinned_bits;
goto set_register;
}
- /* Warn after we've set the missing bits. */
- WARN_ONCE(bits_missing, "CR4 bits went missing: %lx!?\n",
- bits_missing);
+ /* Warn after we've corrected the changed bits. */
+ WARN_ONCE(bits_changed, "pinned CR4 bits changed: 0x%lx!?\n",
+ bits_changed);
}
}
#if IS_MODULE(CONFIG_LKDTM)
@@ -419,7 +422,7 @@ void cr4_init(void)
if (boot_cpu_has(X86_FEATURE_PCID))
cr4 |= X86_CR4_PCIDE;
if (static_branch_likely(&cr_pinning))
- cr4 |= cr4_pinned_bits;
+ cr4 = (cr4 & ~cr4_pinned_mask) | cr4_pinned_bits;
__write_cr4(cr4);
@@ -434,10 +437,7 @@ void cr4_init(void)
*/
static void __init setup_cr_pinning(void)
{
- unsigned long mask;
-
- mask = (X86_CR4_SMEP | X86_CR4_SMAP | X86_CR4_UMIP);
- cr4_pinned_bits = this_cpu_read(cpu_tlbstate.cr4) & mask;
+ cr4_pinned_bits = this_cpu_read(cpu_tlbstate.cr4) & cr4_pinned_mask;
static_key_enable(&cr_pinning.key);
}
diff --git a/arch/x86/kernel/cpu/cpu.h b/arch/x86/kernel/cpu/cpu.h
index fb538fccd24c..9d033693519a 100644
--- a/arch/x86/kernel/cpu/cpu.h
+++ b/arch/x86/kernel/cpu/cpu.h
@@ -81,8 +81,4 @@ extern void update_srbds_msr(void);
extern u64 x86_read_arch_cap_msr(void);
-#ifdef CONFIG_IA32_FEAT_CTL
-void init_ia32_feat_ctl(struct cpuinfo_x86 *c);
-#endif
-
#endif /* ARCH_X86_CPU_H */
diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index ce9120c4f740..fbe89a92ff36 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1083,7 +1083,7 @@ static noinstr bool mce_check_crashing_cpu(void)
{
unsigned int cpu = smp_processor_id();
- if (cpu_is_offline(cpu) ||
+ if (arch_cpu_is_offline(cpu) ||
(crashing_cpu != -1 && crashing_cpu != cpu)) {
u64 mcgstatus;
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 12f967c6b603..6a9df71c1b9e 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -981,10 +981,10 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)
c->x86_cache_max_rmid = ecx;
c->x86_cache_occ_scale = ebx;
- if (c->x86_vendor == X86_VENDOR_INTEL)
- c->x86_cache_mbm_width_offset = eax & 0xff;
- else
- c->x86_cache_mbm_width_offset = -1;
+ c->x86_cache_mbm_width_offset = eax & 0xff;
+
+ if (c->x86_vendor == X86_VENDOR_AMD && !c->x86_cache_mbm_width_offset)
+ c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
}
}
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index f20a47d120b1..5ffa32256b3b 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -37,6 +37,7 @@
#define MBA_IS_LINEAR 0x4
#define MBA_MAX_MBPS U32_MAX
#define MAX_MBA_BW_AMD 0x800
+#define MBM_CNTR_WIDTH_OFFSET_AMD 20
#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 23b4b61319d3..3f844f14fc0a 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -1117,6 +1117,7 @@ static int rdt_cdp_peer_get(struct rdt_resource *r, struct rdt_domain *d,
_d_cdp = rdt_find_domain(_r_cdp, d->id, NULL);
if (WARN_ON(IS_ERR_OR_NULL(_d_cdp))) {
_r_cdp = NULL;
+ _d_cdp = NULL;
ret = -EINVAL;
}
diff --git a/arch/x86/kernel/cpu/umwait.c b/arch/x86/kernel/cpu/umwait.c
index 300e3fd5ade3..ec8064c0ae03 100644
--- a/arch/x86/kernel/cpu/umwait.c
+++ b/arch/x86/kernel/cpu/umwait.c
@@ -18,12 +18,6 @@
*/
static u32 umwait_control_cached = UMWAIT_CTRL_VAL(100000, UMWAIT_C02_ENABLE);
-u32 get_umwait_control_msr(void)
-{
- return umwait_control_cached;
-}
-EXPORT_SYMBOL_GPL(get_umwait_control_msr);
-
/*
* Cache the original IA32_UMWAIT_CONTROL MSR value which is configured by
* hardware or BIOS before kernel boot.
diff --git a/arch/x86/kernel/cpu/zhaoxin.c b/arch/x86/kernel/cpu/zhaoxin.c
index df1358ba622b..05fa4ef63490 100644
--- a/arch/x86/kernel/cpu/zhaoxin.c
+++ b/arch/x86/kernel/cpu/zhaoxin.c
@@ -2,6 +2,7 @@
#include <linux/sched.h>
#include <linux/sched/clock.h>
+#include <asm/cpu.h>
#include <asm/cpufeature.h>
#include "cpu.h"
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 456511b2284e..b037cfa7c0c5 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -106,7 +106,7 @@ void show_opcodes(struct pt_regs *regs, const char *loglvl)
bad_ip = user_mode(regs) &&
__chk_range_not_ok(prologue, OPCODE_BUFSIZE, TASK_SIZE_MAX);
- if (bad_ip || probe_kernel_read(opcodes, (u8 *)prologue,
+ if (bad_ip || copy_from_kernel_nofault(opcodes, (u8 *)prologue,
OPCODE_BUFSIZE)) {
printk("%sCode: Bad RIP value.\n", loglvl);
} else {
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index c84d28e90a58..51504566b3a6 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -86,7 +86,7 @@ static int ftrace_verify_code(unsigned long ip, const char *old_code)
* sure what we read is what we expected it to be before modifying it.
*/
/* read the text we want to modify */
- if (probe_kernel_read(cur_code, (void *)ip, MCOUNT_INSN_SIZE)) {
+ if (copy_from_kernel_nofault(cur_code, (void *)ip, MCOUNT_INSN_SIZE)) {
WARN_ON(1);
return -EFAULT;
}
@@ -355,7 +355,7 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
npages = DIV_ROUND_UP(*tramp_size, PAGE_SIZE);
/* Copy ftrace_caller onto the trampoline memory */
- ret = probe_kernel_read(trampoline, (void *)start_offset, size);
+ ret = copy_from_kernel_nofault(trampoline, (void *)start_offset, size);
if (WARN_ON(ret < 0))
goto fail;
@@ -363,13 +363,13 @@ create_trampoline(struct ftrace_ops *ops, unsigned int *tramp_size)
/* The trampoline ends with ret(q) */
retq = (unsigned long)ftrace_stub;
- ret = probe_kernel_read(ip, (void *)retq, RET_SIZE);
+ ret = copy_from_kernel_nofault(ip, (void *)retq, RET_SIZE);
if (WARN_ON(ret < 0))
goto fail;
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS) {
ip = trampoline + (ftrace_regs_caller_ret - ftrace_regs_caller);
- ret = probe_kernel_read(ip, (void *)retq, RET_SIZE);
+ ret = copy_from_kernel_nofault(ip, (void *)retq, RET_SIZE);
if (WARN_ON(ret < 0))
goto fail;
}
@@ -506,7 +506,7 @@ static void *addr_from_call(void *ptr)
union text_poke_insn call;
int ret;
- ret = probe_kernel_read(&call, ptr, CALL_INSN_SIZE);
+ ret = copy_from_kernel_nofault(&call, ptr, CALL_INSN_SIZE);
if (WARN_ON_ONCE(ret < 0))
return NULL;
diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c
index c44fe7d8d9a4..68acd30c6b87 100644
--- a/arch/x86/kernel/kgdb.c
+++ b/arch/x86/kernel/kgdb.c
@@ -732,11 +732,11 @@ int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
int err;
bpt->type = BP_BREAKPOINT;
- err = probe_kernel_read(bpt->saved_instr, (char *)bpt->bpt_addr,
+ err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr,
BREAK_INSTR_SIZE);
if (err)
return err;
- err = probe_kernel_write((char *)bpt->bpt_addr,
+ err = copy_to_kernel_nofault((char *)bpt->bpt_addr,
arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE);
if (!err)
return err;
@@ -768,7 +768,7 @@ int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
return 0;
knl_write:
- return probe_kernel_write((char *)bpt->bpt_addr,
+ return copy_to_kernel_nofault((char *)bpt->bpt_addr,
(char *)bpt->saved_instr, BREAK_INSTR_SIZE);
}
diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 3bafe1bd4dc7..ada39ddbc922 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -243,7 +243,7 @@ __recover_probed_insn(kprobe_opcode_t *buf, unsigned long addr)
* Fortunately, we know that the original code is the ideal 5-byte
* long NOP.
*/
- if (probe_kernel_read(buf, (void *)addr,
+ if (copy_from_kernel_nofault(buf, (void *)addr,
MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
return 0UL;
@@ -346,7 +346,8 @@ int __copy_instruction(u8 *dest, u8 *src, u8 *real, struct insn *insn)
return 0;
/* This can access kernel text if given address is not recovered */
- if (probe_kernel_read(dest, (void *)recovered_insn, MAX_INSN_SIZE))
+ if (copy_from_kernel_nofault(dest, (void *)recovered_insn,
+ MAX_INSN_SIZE))
return 0;
kernel_insn_init(insn, dest, MAX_INSN_SIZE);
@@ -753,16 +754,11 @@ asm(
NOKPROBE_SYMBOL(kretprobe_trampoline);
STACK_FRAME_NON_STANDARD(kretprobe_trampoline);
-static struct kprobe kretprobe_kprobe = {
- .addr = (void *)kretprobe_trampoline,
-};
-
/*
* Called from kretprobe_trampoline
*/
__used __visible void *trampoline_handler(struct pt_regs *regs)
{
- struct kprobe_ctlblk *kcb;
struct kretprobe_instance *ri = NULL;
struct hlist_head *head, empty_rp;
struct hlist_node *tmp;
@@ -772,16 +768,12 @@ __used __visible void *trampoline_handler(struct pt_regs *regs)
void *frame_pointer;
bool skipped = false;
- preempt_disable();
-
/*
* Set a dummy kprobe for avoiding kretprobe recursion.
* Since kretprobe never run in kprobe handler, kprobe must not
* be running at this point.
*/
- kcb = get_kprobe_ctlblk();
- __this_cpu_write(current_kprobe, &kretprobe_kprobe);
- kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+ kprobe_busy_begin();
INIT_HLIST_HEAD(&empty_rp);
kretprobe_hash_lock(current, &head, &flags);
@@ -857,7 +849,7 @@ __used __visible void *trampoline_handler(struct pt_regs *regs)
__this_cpu_write(current_kprobe, &ri->rp->kp);
ri->ret_addr = correct_ret_addr;
ri->rp->handler(ri, regs);
- __this_cpu_write(current_kprobe, &kretprobe_kprobe);
+ __this_cpu_write(current_kprobe, &kprobe_busy);
}
recycle_rp_inst(ri, &empty_rp);
@@ -873,8 +865,7 @@ __used __visible void *trampoline_handler(struct pt_regs *regs)
kretprobe_hash_unlock(current, &flags);
- __this_cpu_write(current_kprobe, NULL);
- preempt_enable();
+ kprobe_busy_end();
hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
hlist_del(&ri->hlist);
diff --git a/arch/x86/kernel/kprobes/opt.c b/arch/x86/kernel/kprobes/opt.c
index 321c19950285..7af4c61dde52 100644
--- a/arch/x86/kernel/kprobes/opt.c
+++ b/arch/x86/kernel/kprobes/opt.c
@@ -56,7 +56,7 @@ found:
* overwritten by jump destination address. In this case, original
* bytes must be recovered from op->optinsn.copied_insn buffer.
*/
- if (probe_kernel_read(buf, (void *)addr,
+ if (copy_from_kernel_nofault(buf, (void *)addr,
MAX_INSN_SIZE * sizeof(kprobe_opcode_t)))
return 0UL;
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 2de365f15684..d7c5e44b26f7 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -478,7 +478,7 @@ static DEFINE_PER_CPU(unsigned long, nmi_dr7);
DEFINE_IDTENTRY_RAW(exc_nmi)
{
- if (IS_ENABLED(CONFIG_SMP) && cpu_is_offline(smp_processor_id()))
+ if (IS_ENABLED(CONFIG_SMP) && arch_cpu_is_offline(smp_processor_id()))
return;
if (this_cpu_read(nmi_state) != NMI_NOT_RUNNING) {
diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c
index ee0286390a4c..9e1def3744f2 100644
--- a/arch/x86/kernel/probe_roms.c
+++ b/arch/x86/kernel/probe_roms.c
@@ -94,12 +94,12 @@ static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short
}
static bool probe_list(struct pci_dev *pdev, unsigned short vendor,
- const unsigned char *rom_list)
+ const void *rom_list)
{
unsigned short device;
do {
- if (probe_kernel_address(rom_list, device) != 0)
+ if (get_kernel_nofault(device, rom_list) != 0)
device = 0;
if (device && match_id(pdev, vendor, device))
@@ -119,19 +119,19 @@ static struct resource *find_oprom(struct pci_dev *pdev)
for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
struct resource *res = &adapter_rom_resources[i];
unsigned short offset, vendor, device, list, rev;
- const unsigned char *rom;
+ const void *rom;
if (res->end == 0)
break;
rom = isa_bus_to_virt(res->start);
- if (probe_kernel_address(rom + 0x18, offset) != 0)
+ if (get_kernel_nofault(offset, rom + 0x18) != 0)
continue;
- if (probe_kernel_address(rom + offset + 0x4, vendor) != 0)
+ if (get_kernel_nofault(vendor, rom + offset + 0x4) != 0)
continue;
- if (probe_kernel_address(rom + offset + 0x6, device) != 0)
+ if (get_kernel_nofault(device, rom + offset + 0x6) != 0)
continue;
if (match_id(pdev, vendor, device)) {
@@ -139,8 +139,8 @@ static struct resource *find_oprom(struct pci_dev *pdev)
break;
}
- if (probe_kernel_address(rom + offset + 0x8, list) == 0 &&
- probe_kernel_address(rom + offset + 0xc, rev) == 0 &&
+ if (get_kernel_nofault(list, rom + offset + 0x8) == 0 &&
+ get_kernel_nofault(rev, rom + offset + 0xc) == 0 &&
rev >= 3 && list &&
probe_list(pdev, vendor, rom + offset + list)) {
oprom = res;
@@ -183,14 +183,14 @@ static int __init romsignature(const unsigned char *rom)
const unsigned short * const ptr = (const unsigned short *)rom;
unsigned short sig;
- return probe_kernel_address(ptr, sig) == 0 && sig == ROMSIGNATURE;
+ return get_kernel_nofault(sig, ptr) == 0 && sig == ROMSIGNATURE;
}
static int __init romchecksum(const unsigned char *rom, unsigned long length)
{
unsigned char sum, c;
- for (sum = 0; length && probe_kernel_address(rom++, c) == 0; length--)
+ for (sum = 0; length && get_kernel_nofault(c, rom++) == 0; length--)
sum += c;
return !length && !sum;
}
@@ -211,7 +211,7 @@ void __init probe_roms(void)
video_rom_resource.start = start;
- if (probe_kernel_address(rom + 2, c) != 0)
+ if (get_kernel_nofault(c, rom + 2) != 0)
continue;
/* 0 < length <= 0x7f * 512, historically */
@@ -249,7 +249,7 @@ void __init probe_roms(void)
if (!romsignature(rom))
continue;
- if (probe_kernel_address(rom + 2, c) != 0)
+ if (get_kernel_nofault(c, rom + 2) != 0)
continue;
/* 0 < length <= 0x7f * 512, historically */
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index af75109485c2..f58679e487f6 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -84,17 +84,16 @@ static inline void cond_local_irq_disable(struct pt_regs *regs)
local_irq_disable();
}
-int is_valid_bugaddr(unsigned long addr)
+__always_inline int is_valid_bugaddr(unsigned long addr)
{
- unsigned short ud;
-
if (addr < TASK_SIZE_MAX)
return 0;
- if (probe_kernel_address((unsigned short *)addr, ud))
- return 0;
-
- return ud == INSN_UD0 || ud == INSN_UD2;
+ /*
+ * We got #UD, if the text isn't readable we'd have gotten
+ * a different exception.
+ */
+ return *(unsigned short *)addr == INSN_UD2;
}
static nokprobe_inline int
@@ -216,40 +215,45 @@ static inline void handle_invalid_op(struct pt_regs *regs)
ILL_ILLOPN, error_get_trap_addr(regs));
}
-DEFINE_IDTENTRY_RAW(exc_invalid_op)
+static noinstr bool handle_bug(struct pt_regs *regs)
{
- bool rcu_exit;
+ bool handled = false;
+
+ if (!is_valid_bugaddr(regs->ip))
+ return handled;
/*
- * Handle BUG/WARN like NMIs instead of like normal idtentries:
- * if we bugged/warned in a bad RCU context, for example, the last
- * thing we want is to BUG/WARN again in the idtentry code, ad
- * infinitum.
+ * All lies, just get the WARN/BUG out.
*/
- if (!user_mode(regs) && is_valid_bugaddr(regs->ip)) {
- enum bug_trap_type type;
+ instrumentation_begin();
+ /*
+ * Since we're emulating a CALL with exceptions, restore the interrupt
+ * state to what it was at the exception site.
+ */
+ if (regs->flags & X86_EFLAGS_IF)
+ raw_local_irq_enable();
+ if (report_bug(regs->ip, regs) == BUG_TRAP_TYPE_WARN) {
+ regs->ip += LEN_UD2;
+ handled = true;
+ }
+ if (regs->flags & X86_EFLAGS_IF)
+ raw_local_irq_disable();
+ instrumentation_end();
- nmi_enter();
- instrumentation_begin();
- trace_hardirqs_off_finish();
- type = report_bug(regs->ip, regs);
- if (regs->flags & X86_EFLAGS_IF)
- trace_hardirqs_on_prepare();
- instrumentation_end();
- nmi_exit();
+ return handled;
+}
- if (type == BUG_TRAP_TYPE_WARN) {
- /* Skip the ud2. */
- regs->ip += LEN_UD2;
- return;
- }
+DEFINE_IDTENTRY_RAW(exc_invalid_op)
+{
+ bool rcu_exit;
- /*
- * Else, if this was a BUG and report_bug returns or if this
- * was just a normal #UD, we want to continue onward and
- * crash.
- */
- }
+ /*
+ * We use UD2 as a short encoding for 'CALL __WARN', as such
+ * handle it before exception entry to avoid recursive WARN
+ * in case exception entry is the one triggering WARNs.
+ */
+ if (!user_mode(regs) && handle_bug(regs))
+ return;
rcu_exit = idtentry_enter_cond_rcu(regs);
instrumentation_begin();
@@ -488,7 +492,8 @@ static enum kernel_gp_hint get_kernel_gp_address(struct pt_regs *regs,
u8 insn_buf[MAX_INSN_SIZE];
struct insn insn;
- if (probe_kernel_read(insn_buf, (void *)regs->ip, MAX_INSN_SIZE))
+ if (copy_from_kernel_nofault(insn_buf, (void *)regs->ip,
+ MAX_INSN_SIZE))
return GP_NO_HINT;
kernel_insn_init(&insn, insn_buf, MAX_INSN_SIZE);
@@ -690,13 +695,13 @@ struct bad_iret_stack *fixup_bad_iret(struct bad_iret_stack *s)
(struct bad_iret_stack *)__this_cpu_read(cpu_tss_rw.x86_tss.sp0) - 1;
/* Copy the IRET target to the temporary storage. */
- memcpy(&tmp.regs.ip, (void *)s->regs.sp, 5*8);
+ __memcpy(&tmp.regs.ip, (void *)s->regs.sp, 5*8);
/* Copy the remainder of the stack from the current stack. */
- memcpy(&tmp, s, offsetof(struct bad_iret_stack, regs.ip));
+ __memcpy(&tmp, s, offsetof(struct bad_iret_stack, regs.ip));
/* Update the entry stack */
- memcpy(new_stack, &tmp, sizeof(tmp));
+ __memcpy(new_stack, &tmp, sizeof(tmp));
BUG_ON(!user_mode(&new_stack->regs));
return new_stack;
generated by cgit (git 2.34.1) at 2025-05-01 16:12:10 +0000