@@ -65,6 +65,9 @@ typedef struct compat_sigaltstack {
compat_size_t ss_size;
} compat_stack_t;
#endif
+#ifndef COMPAT_MINSIGSTKSZ
+#define COMPAT_MINSIGSTKSZ MINSIGSTKSZ
+#endif
#define compat_jiffies_to_clock_t(x) \
(((unsigned long)(x) * COMPAT_USER_HZ) / HZ)
@@ -3170,7 +3170,8 @@ int do_sigaction(int sig, struct k_sigaction *act, struct k_sigaction *oact)
}
static int
-do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long sp)
+do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long sp,
+ size_t min_ss_size)
{
stack_t oss;
int error;
@@ -3213,7 +3214,7 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
ss_sp = NULL;
} else {
error = -ENOMEM;
- if (ss_size < MINSIGSTKSZ)
+ if (ss_size < min_ss_size)
goto out;
}
@@ -3236,12 +3237,14 @@ out:
}
SYSCALL_DEFINE2(sigaltstack,const stack_t __user *,uss, stack_t __user *,uoss)
{
- return do_sigaltstack(uss, uoss, current_user_stack_pointer());
+ return do_sigaltstack(uss, uoss, current_user_stack_pointer(),
+ MINSIGSTKSZ);
}
int restore_altstack(const stack_t __user *uss)
{
- int err = do_sigaltstack(uss, NULL, current_user_stack_pointer());
+ int err = do_sigaltstack(uss, NULL, current_user_stack_pointer(),
+ MINSIGSTKSZ);
/* squash all but EFAULT for now */
return err == -EFAULT ? err : 0;
}
@@ -3277,7 +3280,8 @@ COMPAT_SYSCALL_DEFINE2(sigaltstack,
set_fs(KERNEL_DS);
ret = do_sigaltstack((stack_t __force __user *) (uss_ptr ? &uss : NULL),
(stack_t __force __user *) &uoss,
- compat_user_stack_pointer());
+ compat_user_stack_pointer(),
+ COMPAT_MINSIGSTKSZ);
set_fs(seg);
if (ret >= 0 && uoss_ptr) {
if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(compat_stack_t)) ||