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make sys_gettimeofday() use copy_to_user()

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NAKAMURA Gou
2015-09-16 12:39:36 +09:00
parent c8a13cf213
commit bd5708286d
1 changed files with 7 additions and 9 deletions
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16
kernel/syscall.c
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@@ -4977,6 +4977,8 @@ SYSCALL_DECLARE(gettimeofday)
struct timeval *tv = (struct timeval *)ihk_mc_syscall_arg0(ctx); struct timeval *tv = (struct timeval *)ihk_mc_syscall_arg0(ctx);
struct syscall_request request IHK_DMA_ALIGN; struct syscall_request request IHK_DMA_ALIGN;
struct timezone *tz = (struct timezone *)ihk_mc_syscall_arg1(ctx); struct timezone *tz = (struct timezone *)ihk_mc_syscall_arg1(ctx);
struct timeval atv;
int error;
if (!tv && !tz) { if (!tv && !tz) {
/* nothing to do */ /* nothing to do */
@@ -4987,17 +4989,13 @@ SYSCALL_DECLARE(gettimeofday)
if (!tz && gettime_local_support) { if (!tz && gettime_local_support) {
update_cpu_local_time(); update_cpu_local_time();
/* Check validity of argument */ atv.tv_sec = cpu_local_var(tv_sec);
if (!lookup_process_memory_range(cpu_local_var(current)->vm, atv.tv_usec = cpu_local_var(tv_nsec) / 1000;
(unsigned long)tv, (unsigned long)tv + sizeof(*tv))) {
return -EFAULT;
}
tv->tv_sec = cpu_local_var(tv_sec); error = copy_to_user(tv, &atv, sizeof(atv));
tv->tv_usec = cpu_local_var(tv_nsec) / 1000;
dkprintf("gettimeofday(): \n"); dkprintf("gettimeofday(): %d\n", error);
return 0; return error;
} }
/* Otherwise offload */ /* Otherwise offload */