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[PATCH] Save NVGPRS in 32-bit signal frame

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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>
This commit is contained in:
David Woodhouse 2005-11-24 12:51:40 +00:00 committed by Paul Mackerras
parent 31df1678d7
commit 9687c58759
1 changed files with 9 additions and 0 deletions
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9
arch/powerpc/kernel/signal_32.c
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@ -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);
}