Commit d26654e5 authored by Al Viro's avatar Al Viro

openrisk: fix altstack switching on sigreturn

do_sigaltstack() expects _userland_ address, TYVM...
Signed-off-by: default avatarAl Viro <>
parent 9436d5c3
......@@ -84,7 +84,6 @@ asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
struct rt_sigframe *frame = (struct rt_sigframe __user *)regs->sp;
sigset_t set;
stack_t st;
* Since we stacked the signal on a dword boundary,
......@@ -104,11 +103,10 @@ asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
goto badframe;
if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
goto badframe;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
do_sigaltstack(&st, NULL, regs->sp);
if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->sp) == -EFAULT)
goto badframe;
return regs->gpr[11];
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