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[SPARC64]: Kill bogus set_fs(KERNEL_DS) in do_rt_sigreturn(). 

From: Oleg Nesterov <oleg@tv-sign.ru>

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleg Nesterov 2007-07-17 14:37:54 -07:00 committed by David S. Miller
parent c1e49e3a1b
commit 62715ec832
1 changed files with 3 additions and 12 deletions
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15
arch/sparc64/kernel/signal.c
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@ -289,9 +289,7 @@ void do_rt_sigreturn(struct pt_regs *regs)
struct rt_signal_frame __user *sf;
unsigned long tpc, tnpc, tstate;
__siginfo_fpu_t __user *fpu_save;
mm_segment_t old_fs;
sigset_t set;
stack_t st;
int err;
/* Always make any pending restarted system calls return -EINTR */
@ -327,20 +325,13 @@ void do_rt_sigreturn(struct pt_regs *regs)
err |= restore_fpu_state(regs, &sf->fpu_state);
err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
err |= __copy_from_user(&st, &sf->stack, sizeof(stack_t));
err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
if (err)
goto segv;
regs->tpc = tpc;
regs->tnpc = tnpc;
/* It is more difficult to avoid calling this function than to
call it and ignore errors. */
old_fs = get_fs();
set_fs(KERNEL_DS);
do_sigaltstack((const stack_t __user *) &st, NULL, (unsigned long)sf);
set_fs(old_fs);
sigdelsetmask(&set, ~_BLOCKABLE);
spin_lock_irq(&current->sighand->siglock);