| Message ID | 20230104174433.1259428-3-ardb@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | efi: Follow-up fixes for EFI runtime stack | expand |
On Wed, Jan 04, 2023 at 06:44:33PM +0100, Ard Biesheuvel wrote: > The EFI runtime services run from a dedicated stack now, and so the > stack unwinder needs to be informed about this. > > Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Thanks for this! Mark. > --- > arch/arm64/include/asm/stacktrace.h | 15 +++++++++++++++ > arch/arm64/kernel/stacktrace.c | 12 ++++++++++++ > 2 files changed, 27 insertions(+) > > diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h > index 4e5354beafb01bac..66ec8caa6ac07fa0 100644 > --- a/arch/arm64/include/asm/stacktrace.h > +++ b/arch/arm64/include/asm/stacktrace.h > @@ -106,4 +106,19 @@ static inline struct stack_info stackinfo_get_sdei_critical(void) > #define stackinfo_get_sdei_critical() stackinfo_get_unknown() > #endif > > +#ifdef CONFIG_EFI > +extern u64 *efi_rt_stack_top; > + > +static inline struct stack_info stackinfo_get_efi(void) > +{ > + unsigned long high = (u64)efi_rt_stack_top; > + unsigned long low = high - THREAD_SIZE; > + > + return (struct stack_info) { > + .low = low, > + .high = high, > + }; > +} > +#endif > + > #endif /* __ASM_STACKTRACE_H */ > diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c > index 117e2c180f3c77d8..83154303e682c8b6 100644 > --- a/arch/arm64/kernel/stacktrace.c > +++ b/arch/arm64/kernel/stacktrace.c > @@ -5,6 +5,7 @@ > * Copyright (C) 2012 ARM Ltd. > */ > #include <linux/kernel.h> > +#include <linux/efi.h> > #include <linux/export.h> > #include <linux/ftrace.h> > #include <linux/sched.h> > @@ -12,6 +13,7 @@ > #include <linux/sched/task_stack.h> > #include <linux/stacktrace.h> > > +#include <asm/efi.h> > #include <asm/irq.h> > #include <asm/stack_pointer.h> > #include <asm/stacktrace.h> > @@ -186,6 +188,13 @@ void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl) > : stackinfo_get_unknown(); \ > }) > > +#define STACKINFO_EFI \ > + ({ \ > + ((task == current) && current_in_efi()) \ > + ? stackinfo_get_efi() \ > + : stackinfo_get_unknown(); \ > + }) > + > noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry, > void *cookie, struct task_struct *task, > struct pt_regs *regs) > @@ -199,6 +208,9 @@ noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry, > #if defined(CONFIG_VMAP_STACK) && defined(CONFIG_ARM_SDE_INTERFACE) > STACKINFO_SDEI(normal), > STACKINFO_SDEI(critical), > +#endif > +#ifdef CONFIG_EFI > + STACKINFO_EFI, > #endif > }; > struct unwind_state state = { > -- > 2.39.0 >
diff --git a/arch/arm64/include/asm/stacktrace.h b/arch/arm64/include/asm/stacktrace.h index 4e5354beafb01bac..66ec8caa6ac07fa0 100644 --- a/arch/arm64/include/asm/stacktrace.h +++ b/arch/arm64/include/asm/stacktrace.h @@ -106,4 +106,19 @@ static inline struct stack_info stackinfo_get_sdei_critical(void) #define stackinfo_get_sdei_critical() stackinfo_get_unknown() #endif +#ifdef CONFIG_EFI +extern u64 *efi_rt_stack_top; + +static inline struct stack_info stackinfo_get_efi(void) +{ + unsigned long high = (u64)efi_rt_stack_top; + unsigned long low = high - THREAD_SIZE; + + return (struct stack_info) { + .low = low, + .high = high, + }; +} +#endif + #endif /* __ASM_STACKTRACE_H */ diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c index 117e2c180f3c77d8..83154303e682c8b6 100644 --- a/arch/arm64/kernel/stacktrace.c +++ b/arch/arm64/kernel/stacktrace.c @@ -5,6 +5,7 @@ * Copyright (C) 2012 ARM Ltd. */ #include <linux/kernel.h> +#include <linux/efi.h> #include <linux/export.h> #include <linux/ftrace.h> #include <linux/sched.h> @@ -12,6 +13,7 @@ #include <linux/sched/task_stack.h> #include <linux/stacktrace.h> +#include <asm/efi.h> #include <asm/irq.h> #include <asm/stack_pointer.h> #include <asm/stacktrace.h> @@ -186,6 +188,13 @@ void show_stack(struct task_struct *tsk, unsigned long *sp, const char *loglvl) : stackinfo_get_unknown(); \ }) +#define STACKINFO_EFI \ + ({ \ + ((task == current) && current_in_efi()) \ + ? stackinfo_get_efi() \ + : stackinfo_get_unknown(); \ + }) + noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie, struct task_struct *task, struct pt_regs *regs) @@ -199,6 +208,9 @@ noinline noinstr void arch_stack_walk(stack_trace_consume_fn consume_entry, #if defined(CONFIG_VMAP_STACK) && defined(CONFIG_ARM_SDE_INTERFACE) STACKINFO_SDEI(normal), STACKINFO_SDEI(critical), +#endif +#ifdef CONFIG_EFI + STACKINFO_EFI, #endif }; struct unwind_state state = {
The EFI runtime services run from a dedicated stack now, and so the stack unwinder needs to be informed about this. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/arm64/include/asm/stacktrace.h | 15 +++++++++++++++ arch/arm64/kernel/stacktrace.c | 12 ++++++++++++ 2 files changed, 27 insertions(+)