diff options
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/entry_64.S | 7 | ||||
| -rw-r--r-- | arch/powerpc/kernel/ptrace.c | 8 |
2 files changed, 14 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S index 435927f549c4..a2c168b395d2 100644 --- a/arch/powerpc/kernel/entry_64.S +++ b/arch/powerpc/kernel/entry_64.S @@ -1002,6 +1002,13 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR) ld r2,_NIP(r1) mtspr SPRN_SRR0,r2 + /* + * Leaving a stale exception_marker on the stack can confuse + * the reliable stack unwinder later on. Clear it. + */ + li r2,0 + std r2,STACK_FRAME_OVERHEAD-16(r1) + ld r0,GPR0(r1) ld r2,GPR2(r1) ld r3,GPR3(r1) diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c index 53151698bfe0..d9ac7d94656e 100644 --- a/arch/powerpc/kernel/ptrace.c +++ b/arch/powerpc/kernel/ptrace.c @@ -33,6 +33,7 @@ #include <linux/hw_breakpoint.h> #include <linux/perf_event.h> #include <linux/context_tracking.h> +#include <linux/nospec.h> #include <linux/uaccess.h> #include <linux/pkeys.h> @@ -274,6 +275,8 @@ static int set_user_trap(struct task_struct *task, unsigned long trap) */ int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data) { + unsigned int regs_max; + if ((task->thread.regs == NULL) || !data) return -EIO; @@ -297,7 +300,9 @@ int ptrace_get_reg(struct task_struct *task, int regno, unsigned long *data) } #endif - if (regno < (sizeof(struct user_pt_regs) / sizeof(unsigned long))) { + regs_max = sizeof(struct user_pt_regs) / sizeof(unsigned long); + if (regno < regs_max) { + regno = array_index_nospec(regno, regs_max); *data = ((unsigned long *)task->thread.regs)[regno]; return 0; } @@ -321,6 +326,7 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data) return set_user_dscr(task, data); if (regno <= PT_MAX_PUT_REG) { + regno = array_index_nospec(regno, PT_MAX_PUT_REG + 1); ((unsigned long *)task->thread.regs)[regno] = data; return 0; } |
