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sparc64: not any error from do_sigaltstack() should fail rt_sigreturn()

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commit fae2ae2a90 upstream.

If a signal handler is executed on altstack and another signal comes,
we will end up with rt_sigreturn() on return from the second handler
getting -EPERM from do_sigaltstack().  It's perfectly OK, since we
are not asking to change the settings; in fact, they couldn't have been
changed during the second handler execution exactly because we'd been
on altstack all along.  64bit sigreturn on sparc treats any error from
do_sigaltstack() as "SIGSEGV now"; we need to switch to the same semantics
we are using on other architectures.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2012-11-18 22:27:03 -05:00 committed by Greg Kroah-Hartman
parent acaf0ed4bd
commit 98165e2b0d
1 changed files with 1 additions and 3 deletions
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4
arch/sparc/kernel/signal_64.c
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@ -309,9 +309,7 @@ void do_rt_sigreturn(struct pt_regs *regs)
err |= restore_fpu_state(regs, fpu_save);
err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
if (err)
if (err || do_sigaltstack(&sf->stack, NULL, (unsigned long)sf) == -EFAULT)
goto segv;
err |= __get_user(rwin_save, &sf->rwin_save);