diff options
Diffstat (limited to 'arch/sparc/kernel/perf_event.c')
| -rw-r--r-- | arch/sparc/kernel/perf_event.c | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/arch/sparc/kernel/perf_event.c b/arch/sparc/kernel/perf_event.c index 59cf917..689db65 100644 --- a/arch/sparc/kernel/perf_event.c +++ b/arch/sparc/kernel/perf_event.c @@ -21,7 +21,7 @@ #include <asm/stacktrace.h> #include <asm/cpudata.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <linux/atomic.h> #include <asm/nmi.h> #include <asm/pcr.h> @@ -1741,18 +1741,31 @@ void perf_callchain_kernel(struct perf_callchain_entry *entry, } while (entry->nr < PERF_MAX_STACK_DEPTH); } +static inline int +valid_user_frame(const void __user *fp, unsigned long size) +{ + /* addresses should be at least 4-byte aligned */ + if (((unsigned long) fp) & 3) + return 0; + + return (__range_not_ok(fp, size, TASK_SIZE) == 0); +} + static void perf_callchain_user_64(struct perf_callchain_entry *entry, struct pt_regs *regs) { unsigned long ufp; - ufp = regs->u_regs[UREG_I6] + STACK_BIAS; + ufp = regs->u_regs[UREG_FP] + STACK_BIAS; do { struct sparc_stackf __user *usf; struct sparc_stackf sf; unsigned long pc; usf = (struct sparc_stackf __user *)ufp; + if (!valid_user_frame(usf, sizeof(sf))) + break; + if (__copy_from_user_inatomic(&sf, usf, sizeof(sf))) break; @@ -1767,7 +1780,7 @@ static void perf_callchain_user_32(struct perf_callchain_entry *entry, { unsigned long ufp; - ufp = regs->u_regs[UREG_I6] & 0xffffffffUL; + ufp = regs->u_regs[UREG_FP] & 0xffffffffUL; do { unsigned long pc; @@ -1803,8 +1816,13 @@ perf_callchain_user(struct perf_callchain_entry *entry, struct pt_regs *regs) return; flushw_user(); + + pagefault_disable(); + if (test_thread_flag(TIF_32BIT)) perf_callchain_user_32(entry, regs); else perf_callchain_user_64(entry, regs); + + pagefault_enable(); } |