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authorDavid Woodhouse <dwmw2@infradead.org>2005-11-24 12:51:40 +0000
committerPaul Mackerras <paulus@samba.org>2006-01-09 14:50:45 +1100
commit9687c587596b54a77f08620595f5686ea35eed97 (patch)
treebc2886ec26d992b20a887a355b2240129f6e0423
parent31df1678d7732b94178a6e457ed6666e4431212f (diff)
[PATCH] Save NVGPRS in 32-bit signal frame
Somehow this one slipped through the cracks; when we ended up in do_signal() on a 32-bit kernel but without having the caller-saved registers into the regs, we didn't set the TIF_SAVE_NVGPRS flag to ensure they got saved later. Signed-off-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
-rw-r--r--arch/powerpc/kernel/signal_32.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index c9d02751127..d3f0b6d452f 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -219,6 +219,15 @@ static inline int get_old_sigaction(struct k_sigaction *new_ka,
static inline int save_general_regs(struct pt_regs *regs,
struct mcontext __user *frame)
{
+ if (!FULL_REGS(regs)) {
+ /* Zero out the unsaved GPRs to avoid information
+ leak, and set TIF_SAVE_NVGPRS to ensure that the
+ registers do actually get saved later. */
+ memset(&regs->gpr[14], 0, 18 * sizeof(unsigned long));
+ current_thread_info()->nvgprs_frame = &frame->mc_gregs;
+ set_thread_flag(TIF_SAVE_NVGPRS);
+ }
+
return __copy_to_user(&frame->mc_gregs, regs, GP_REGS_SIZE);
}