diff options
| -rw-r--r-- | arch/arm64/include/asm/exec.h | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/process.c | 3 | ||||
| -rw-r--r-- | arch/arm64/kernel/suspend.c | 11 |
3 files changed, 16 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/exec.h b/arch/arm64/include/asm/exec.h index db0563c23482..f7865dd9d868 100644 --- a/arch/arm64/include/asm/exec.h +++ b/arch/arm64/include/asm/exec.h @@ -18,6 +18,9 @@ #ifndef __ASM_EXEC_H #define __ASM_EXEC_H +#include <linux/sched.h> + extern unsigned long arch_align_stack(unsigned long sp); +void uao_thread_switch(struct task_struct *next); #endif /* __ASM_EXEC_H */ diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c index 27b2f1387df4..4f186c56c5eb 100644 --- a/arch/arm64/kernel/process.c +++ b/arch/arm64/kernel/process.c @@ -49,6 +49,7 @@ #include <asm/alternative.h> #include <asm/compat.h> #include <asm/cacheflush.h> +#include <asm/exec.h> #include <asm/fpsimd.h> #include <asm/mmu_context.h> #include <asm/processor.h> @@ -301,7 +302,7 @@ static void tls_thread_switch(struct task_struct *next) } /* Restore the UAO state depending on next's addr_limit */ -static void uao_thread_switch(struct task_struct *next) +void uao_thread_switch(struct task_struct *next) { if (IS_ENABLED(CONFIG_ARM64_UAO)) { if (task_thread_info(next)->addr_limit == KERNEL_DS) diff --git a/arch/arm64/kernel/suspend.c b/arch/arm64/kernel/suspend.c index ad734142070d..bb0cd787a9d3 100644 --- a/arch/arm64/kernel/suspend.c +++ b/arch/arm64/kernel/suspend.c @@ -1,8 +1,11 @@ #include <linux/ftrace.h> #include <linux/percpu.h> #include <linux/slab.h> +#include <asm/alternative.h> #include <asm/cacheflush.h> +#include <asm/cpufeature.h> #include <asm/debug-monitors.h> +#include <asm/exec.h> #include <asm/pgtable.h> #include <asm/memory.h> #include <asm/mmu_context.h> @@ -50,6 +53,14 @@ void notrace __cpu_suspend_exit(void) set_my_cpu_offset(per_cpu_offset(cpu)); /* + * PSTATE was not saved over suspend/resume, re-enable any detected + * features that might not have been set correctly. + */ + asm(ALTERNATIVE("nop", SET_PSTATE_PAN(1), ARM64_HAS_PAN, + CONFIG_ARM64_PAN)); + uao_thread_switch(current); + + /* * Restore HW breakpoint registers to sane values * before debug exceptions are possibly reenabled * through local_dbg_restore. |