Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=44c64e6b15ceab6a4927f54e1081a74ba096b95a
Commit: 44c64e6b15ceab6a4927f54e1081a74ba096b95a
Parent: c658eac628aa8df040dfe614556d95e6da3a9ffb
Author: Chris Zankel <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 11 11:44:17 2008 -0800
Committer: Chris Zankel <[EMAIL PROTECTED]>
CommitDate: Wed Feb 13 17:42:31 2008 -0800
[XTENSA] Add support for the sa_restorer function
Supporting the sa_restorer function allows for better security
since the sigreturn system call doesn't need to be placed on
the stack, so the stack doesn't need to be executable. This
requires support from the c-library as it has to provide the
restorer function.
Signed-off-by: Chris Zankel <[EMAIL PROTECTED]>
---
arch/xtensa/kernel/signal.c | 16 ++++++++++------
1 files changed, 10 insertions(+), 6 deletions(-)
diff --git a/arch/xtensa/kernel/signal.c b/arch/xtensa/kernel/signal.c
index 299be42..f2220b5 100644
--- a/arch/xtensa/kernel/signal.c
+++ b/arch/xtensa/kernel/signal.c
@@ -381,14 +381,19 @@ static void setup_frame(int sig, struct k_sigaction *ka,
siginfo_t *info,
err |= setup_sigcontext(frame, regs);
err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
- /* Create sys_rt_sigreturn syscall in stack frame */
+ if (ka->sa.sa_flags & SA_RESTORER) {
+ ra = (unsigned long)ka->sa.sa_restorer;
+ } else {
- err |= gen_return_code(frame->retcode);
+ /* Create sys_rt_sigreturn syscall in stack frame */
- if (err) {
- goto give_sigsegv;
+ err |= gen_return_code(frame->retcode);
+
+ if (err) {
+ goto give_sigsegv;
+ }
+ ra = (unsigned long) frame->retcode;
}
-
/*
* Create signal handler execution context.
@@ -402,7 +407,6 @@ static void setup_frame(int sig, struct k_sigaction *ka,
siginfo_t *info,
/* Set up a stack frame for a call4
* Note: PS.CALLINC is set to one by start_thread
*/
- ra = (unsigned long) frame->retcode;
regs->areg[4] = (((unsigned long) ra) & 0x3fffffff) | 0x40000000;
regs->areg[6] = (unsigned long) signal;
regs->areg[7] = (unsigned long) &frame->info;
-
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