Merge tag 'x86_urgent_for_v5.18_rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

torvalds · torvalds · commit b2da7df52e16 · 2022-05-01T10:03:36.000-07:00
Pull x86 fixes from Borislav Petkov:

 - A fix to disable PCI/MSI[-X] masking for XEN_HVM guests as that is
   solely controlled by the hypervisor

 - A build fix to make the function prototype (__warn()) as visible as
   the definition itself

 - A bunch of objtool annotation fixes which have accumulated over time

 - An ORC unwinder fix to handle bad input gracefully

 - Well, we thought the microcode gets loaded in time in order to
   restore the microcode-emulated MSRs but we thought wrong. So there's
   a fix for that to have the ordering done properly

 - Add new Intel model numbers

 - A spelling fix

* tag 'x86_urgent_for_v5.18_rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/pci/xen: Disable PCI/MSI[-X] masking for XEN_HVM guests
  bug: Have __warn() prototype defined unconditionally
  x86/Kconfig: fix the spelling of 'becoming' in X86_KERNEL_IBT config
  objtool: Use offstr() to print address of missing ENDBR
  objtool: Print data address for "!ENDBR" data warnings
  x86/xen: Add ANNOTATE_NOENDBR to startup_xen()
  x86/uaccess: Add ENDBR to __put_user_nocheck*()
  x86/retpoline: Add ANNOTATE_NOENDBR for retpolines
  x86/static_call: Add ANNOTATE_NOENDBR to static call trampoline
  objtool: Enable unreachable warnings for CLANG LTO
  x86,objtool: Explicitly mark idtentry_body()s tail REACHABLE
  x86,objtool: Mark cpu_startup_entry() __noreturn
  x86,xen,objtool: Add UNWIND hint
  lib/strn*,objtool: Enforce user_access_begin() rules
  MAINTAINERS: Add x86 unwinding entry
  x86/unwind/orc: Recheck address range after stack info was updated
  x86/cpu: Load microcode during restore_processor_state()
  x86/cpu: Add new Alderlake and Raptorlake CPU model numbers
diff --git a/MAINTAINERS b/MAINTAINERS
@@ -21443,6 +21443,15 @@ F:	arch/x86/include/asm/uv/
 F:	arch/x86/kernel/apic/x2apic_uv_x.c
 F:	arch/x86/platform/uv/
 
+X86 STACK UNWINDING
+M:	Josh Poimboeuf <jpoimboe@redhat.com>
+M:	Peter Zijlstra <peterz@infradead.org>
+S:	Supported
+F:	arch/x86/include/asm/unwind*.h
+F:	arch/x86/kernel/dumpstack.c
+F:	arch/x86/kernel/stacktrace.c
+F:	arch/x86/kernel/unwind_*.c
+
 X86 VDSO
 M:	Andy Lutomirski <luto@kernel.org>
 L:	linux-kernel@vger.kernel.org
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
@@ -1866,7 +1866,7 @@ config X86_KERNEL_IBT
 	  code with them to make this happen.
 
 	  In addition to building the kernel with IBT, seal all functions that
-	  are not indirect call targets, avoiding them ever becomming one.
+	  are not indirect call targets, avoiding them ever becoming one.
 
 	  This requires LTO like objtool runs and will slow down the build. It
 	  does significantly reduce the number of ENDBR instructions in the
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
@@ -337,6 +337,9 @@ SYM_CODE_END(ret_from_fork)
 
 	call	\cfunc
 
+	/* For some configurations \cfunc ends up being a noreturn. */
+	REACHABLE
+
 	jmp	error_return
 .endm
 
diff --git a/arch/x86/include/asm/intel-family.h b/arch/x86/include/asm/intel-family.h
@@ -26,6 +26,7 @@
  *		_G	- parts with extra graphics on
  *		_X	- regular server parts
  *		_D	- micro server parts
+ *		_N,_P	- other mobile parts
  *
  *		Historical OPTDIFFs:
  *
@@ -107,8 +108,10 @@
 
 #define INTEL_FAM6_ALDERLAKE		0x97	/* Golden Cove / Gracemont */
 #define INTEL_FAM6_ALDERLAKE_L		0x9A	/* Golden Cove / Gracemont */
+#define INTEL_FAM6_ALDERLAKE_N		0xBE
 
 #define INTEL_FAM6_RAPTORLAKE		0xB7
+#define INTEL_FAM6_RAPTORLAKE_P		0xBA
 
 /* "Small Core" Processors (Atom) */
 
diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
@@ -131,10 +131,12 @@ extern void __init load_ucode_bsp(void);
 extern void load_ucode_ap(void);
 void reload_early_microcode(void);
 extern bool initrd_gone;
+void microcode_bsp_resume(void);
 #else
 static inline void __init load_ucode_bsp(void)			{ }
 static inline void load_ucode_ap(void)				{ }
 static inline void reload_early_microcode(void)			{ }
+static inline void microcode_bsp_resume(void)			{ }
 #endif
 
 #endif /* _ASM_X86_MICROCODE_H */
diff --git a/arch/x86/include/asm/static_call.h b/arch/x86/include/asm/static_call.h
@@ -26,6 +26,7 @@
 	    ".align 4						\n"	\
 	    ".globl " STATIC_CALL_TRAMP_STR(name) "		\n"	\
 	    STATIC_CALL_TRAMP_STR(name) ":			\n"	\
+	    ANNOTATE_NOENDBR						\
 	    insns "						\n"	\
 	    ".byte 0x53, 0x43, 0x54				\n"	\
 	    ".type " STATIC_CALL_TRAMP_STR(name) ", @function	\n"	\
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
@@ -758,9 +758,9 @@ static struct subsys_interface mc_cpu_interface = {
 };
 
 /**
- * mc_bp_resume - Update boot CPU microcode during resume.
+ * microcode_bsp_resume - Update boot CPU microcode during resume.
  */
-static void mc_bp_resume(void)
+void microcode_bsp_resume(void)
 {
 	int cpu = smp_processor_id();
 	struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
@@ -772,7 +772,7 @@ static void mc_bp_resume(void)
 }
 
 static struct syscore_ops mc_syscore_ops = {
-	.resume			= mc_bp_resume,
+	.resume			= microcode_bsp_resume,
 };
 
 static int mc_cpu_starting(unsigned int cpu)
diff --git a/arch/x86/kernel/unwind_orc.c b/arch/x86/kernel/unwind_orc.c
@@ -339,11 +339,11 @@ static bool stack_access_ok(struct unwind_state *state, unsigned long _addr,
 	struct stack_info *info = &state->stack_info;
 	void *addr = (void *)_addr;
 
-	if (!on_stack(info, addr, len) &&
-	    (get_stack_info(addr, state->task, info, &state->stack_mask)))
-		return false;
+	if (on_stack(info, addr, len))
+		return true;
 
-	return true;
+	return !get_stack_info(addr, state->task, info, &state->stack_mask) &&
+		on_stack(info, addr, len);
 }
 
 static bool deref_stack_reg(struct unwind_state *state, unsigned long addr,
diff --git a/arch/x86/lib/putuser.S b/arch/x86/lib/putuser.S
@@ -48,6 +48,7 @@ SYM_FUNC_START(__put_user_1)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_1, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 1:	movb %al,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -62,6 +63,7 @@ SYM_FUNC_START(__put_user_2)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_2, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 2:	movw %ax,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -76,6 +78,7 @@ SYM_FUNC_START(__put_user_4)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_4, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 3:	movl %eax,(%_ASM_CX)
 	xor %ecx,%ecx
@@ -90,6 +93,7 @@ SYM_FUNC_START(__put_user_8)
 	cmp %_ASM_BX,%_ASM_CX
 	jae .Lbad_put_user
 SYM_INNER_LABEL(__put_user_nocheck_8, SYM_L_GLOBAL)
+	ENDBR
 	ASM_STAC
 4:	mov %_ASM_AX,(%_ASM_CX)
 #ifdef CONFIG_X86_32
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S
@@ -31,6 +31,7 @@
 	.align RETPOLINE_THUNK_SIZE
 SYM_INNER_LABEL(__x86_indirect_thunk_\reg, SYM_L_GLOBAL)
 	UNWIND_HINT_EMPTY
+	ANNOTATE_NOENDBR
 
 	ALTERNATIVE_2 __stringify(ANNOTATE_RETPOLINE_SAFE; jmp *%\reg), \
 		      __stringify(RETPOLINE \reg), X86_FEATURE_RETPOLINE, \
@@ -55,7 +56,6 @@ SYM_INNER_LABEL(__x86_indirect_thunk_\reg, SYM_L_GLOBAL)
 
 	.align RETPOLINE_THUNK_SIZE
 SYM_CODE_START(__x86_indirect_thunk_array)
-	ANNOTATE_NOENDBR // apply_retpolines
 
 #define GEN(reg) THUNK reg
 #include <asm/GEN-for-each-reg.h>
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
@@ -467,7 +467,6 @@ static __init void xen_setup_pci_msi(void)
 		else
 			xen_msi_ops.setup_msi_irqs = xen_setup_msi_irqs;
 		xen_msi_ops.teardown_msi_irqs = xen_pv_teardown_msi_irqs;
-		pci_msi_ignore_mask = 1;
 	} else if (xen_hvm_domain()) {
 		xen_msi_ops.setup_msi_irqs = xen_hvm_setup_msi_irqs;
 		xen_msi_ops.teardown_msi_irqs = xen_teardown_msi_irqs;
@@ -481,6 +480,11 @@ static __init void xen_setup_pci_msi(void)
 	 * in allocating the native domain and never use it.
 	 */
 	x86_init.irqs.create_pci_msi_domain = xen_create_pci_msi_domain;
+	/*
+	 * With XEN PIRQ/Eventchannels in use PCI/MSI[-X] masking is solely
+	 * controlled by the hypervisor.
+	 */
+	pci_msi_ignore_mask = 1;
 }
 
 #else /* CONFIG_PCI_MSI */
diff --git a/arch/x86/platform/pvh/head.S b/arch/x86/platform/pvh/head.S
@@ -50,6 +50,7 @@
 #define PVH_DS_SEL		(PVH_GDT_ENTRY_DS * 8)
 
 SYM_CODE_START_LOCAL(pvh_start_xen)
+	UNWIND_HINT_EMPTY
 	cld
 
 	lgdt (_pa(gdt))
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
@@ -25,6 +25,7 @@
 #include <asm/cpu.h>
 #include <asm/mmu_context.h>
 #include <asm/cpu_device_id.h>
+#include <asm/microcode.h>
 
 #ifdef CONFIG_X86_32
 __visible unsigned long saved_context_ebx;
@@ -262,11 +263,18 @@ static void notrace __restore_processor_state(struct saved_context *ctxt)
 	x86_platform.restore_sched_clock_state();
 	mtrr_bp_restore();
 	perf_restore_debug_store();
-	msr_restore_context(ctxt);
 
 	c = &cpu_data(smp_processor_id());
 	if (cpu_has(c, X86_FEATURE_MSR_IA32_FEAT_CTL))
 		init_ia32_feat_ctl(c);
+
+	microcode_bsp_resume();
+
+	/*
+	 * This needs to happen after the microcode has been updated upon resume
+	 * because some of the MSRs are "emulated" in microcode.
+	 */
+	msr_restore_context(ctxt);
 }
 
 /* Needed by apm.c */
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
@@ -45,6 +45,7 @@ SYM_CODE_END(hypercall_page)
 	__INIT
 SYM_CODE_START(startup_xen)
 	UNWIND_HINT_EMPTY
+	ANNOTATE_NOENDBR
 	cld
 
 	/* Clear .bss */
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
@@ -21,6 +21,12 @@
 #include <linux/panic.h>
 #include <linux/printk.h>
 
+struct warn_args;
+struct pt_regs;
+
+void __warn(const char *file, int line, void *caller, unsigned taint,
+	    struct pt_regs *regs, struct warn_args *args);
+
 #ifdef CONFIG_BUG
 
 #ifdef CONFIG_GENERIC_BUG
@@ -110,11 +116,6 @@ extern __printf(1, 2) void __warn_printk(const char *fmt, ...);
 #endif
 
 /* used internally by panic.c */
-struct warn_args;
-struct pt_regs;
-
-void __warn(const char *file, int line, void *caller, unsigned taint,
-	    struct pt_regs *regs, struct warn_args *args);
 
 #ifndef WARN_ON
 #define WARN_ON(condition) ({						\
diff --git a/include/linux/cpu.h b/include/linux/cpu.h
@@ -167,7 +167,7 @@ static inline int suspend_disable_secondary_cpus(void) { return 0; }
 static inline void suspend_enable_secondary_cpus(void) { }
 #endif /* !CONFIG_PM_SLEEP_SMP */
 
-void cpu_startup_entry(enum cpuhp_state state);
+void __noreturn cpu_startup_entry(enum cpuhp_state state);
 
 void cpu_idle_poll_ctrl(bool enable);
 
diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c
@@ -25,7 +25,7 @@
  * hit it), 'max' is the address space maximum (and we return
  * -EFAULT if we hit it).
  */
-static inline long do_strncpy_from_user(char *dst, const char __user *src,
+static __always_inline long do_strncpy_from_user(char *dst, const char __user *src,
 					unsigned long count, unsigned long max)
 {
 	const struct word_at_a_time constants = WORD_AT_A_TIME_CONSTANTS;
diff --git a/lib/strnlen_user.c b/lib/strnlen_user.c
@@ -20,7 +20,7 @@
  * if it fits in a aligned 'long'. The caller needs to check
  * the return value against "> max".
  */
-static inline long do_strnlen_user(const char __user *src, unsigned long count, unsigned long max)
+static __always_inline long do_strnlen_user(const char __user *src, unsigned long count, unsigned long max)
 {
 	const struct word_at_a_time constants = WORD_AT_A_TIME_CONSTANTS;
 	unsigned long align, res = 0;
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
@@ -231,7 +231,7 @@ objtool_args =								\
 	$(if $(part-of-module), --module)				\
 	$(if $(CONFIG_X86_KERNEL_IBT), --lto --ibt)			\
 	$(if $(CONFIG_FRAME_POINTER),, --no-fp)				\
-	$(if $(CONFIG_GCOV_KERNEL)$(CONFIG_LTO_CLANG), --no-unreachable)\
+	$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)			\
 	$(if $(CONFIG_RETPOLINE), --retpoline)				\
 	$(if $(CONFIG_X86_SMAP), --uaccess)				\
 	$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount)		\
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
@@ -140,7 +140,7 @@ objtool_link()
 		if ! is_enabled CONFIG_FRAME_POINTER; then
 			objtoolopt="${objtoolopt} --no-fp"
 		fi
-		if is_enabled CONFIG_GCOV_KERNEL || is_enabled CONFIG_LTO_CLANG; then
+		if is_enabled CONFIG_GCOV_KERNEL; then
 			objtoolopt="${objtoolopt} --no-unreachable"
 		fi
 		if is_enabled CONFIG_RETPOLINE; then
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
@@ -184,6 +184,7 @@ static bool __dead_end_function(struct objtool_file *file, struct symbol *func,
 		"do_group_exit",
 		"stop_this_cpu",
 		"__invalid_creds",
+               "cpu_startup_entry",
 	};
 
 	if (!func)
@@ -3217,9 +3218,8 @@ validate_ibt_reloc(struct objtool_file *file, struct reloc *reloc)
 static void warn_noendbr(const char *msg, struct section *sec, unsigned long offset,
 			 struct instruction *dest)
 {
-	WARN_FUNC("%srelocation to !ENDBR: %s+0x%lx", sec, offset, msg,
-		  dest->func ? dest->func->name : dest->sec->name,
-		  dest->func ? dest->offset - dest->func->offset : dest->offset);
+	WARN_FUNC("%srelocation to !ENDBR: %s", sec, offset, msg,
+		  offstr(dest->sec, dest->offset));
 }
 
 static void validate_ibt_dest(struct objtool_file *file, struct instruction *insn,
@@ -3823,11 +3823,8 @@ static int validate_ibt(struct objtool_file *file)
 			struct instruction *dest;
 
 			dest = validate_ibt_reloc(file, reloc);
-			if (is_data && dest && !dest->noendbr) {
-				warn_noendbr("data ", reloc->sym->sec,
-					     reloc->sym->offset + reloc->addend,
-					     dest);
-			}
+			if (is_data && dest && !dest->noendbr)
+				warn_noendbr("data ", sec, reloc->offset, dest);
 		}
 	}
 

Original file line number	Diff line number	Diff line change
`@@ -26,6 +26,7 @@`
`26`	`26`	`* _G - parts with extra graphics on`
`27`	`27`	`* _X - regular server parts`
`28`	`28`	`* _D - micro server parts`
	`29`	`+ * _N,_P - other mobile parts`
`29`	`30`	`*`
`30`	`31`	`* Historical OPTDIFFs:`
`31`	`32`	`*`
`@@ -107,8 +108,10 @@`
`107`	`108`
`108`	`109`	`#define INTEL_FAM6_ALDERLAKE 0x97 /* Golden Cove / Gracemont */`
`109`	`110`	`#define INTEL_FAM6_ALDERLAKE_L 0x9A /* Golden Cove / Gracemont */`
	`111`	`+#define INTEL_FAM6_ALDERLAKE_N 0xBE`
`110`	`112`
`111`	`113`	`#define INTEL_FAM6_RAPTORLAKE 0xB7`
	`114`	`+#define INTEL_FAM6_RAPTORLAKE_P 0xBA`
`112`	`115`
`113`	`116`	`/* "Small Core" Processors (Atom) */`
`114`	`117`