Same principle as with the previous patch - do not destroy the state if sigframe setup fails. Incidentally, it's actually _less_ work - we don't need to go through adjust_stack dance on failure if we don't touch regs->stkadj until we know we'd written sigframe out.
Signed-off-by: Al Viro <[email protected]> --- arch/m68k/kernel/signal.c | 44 ++++++++++++++++++++++++++++++-------------- 1 files changed, 30 insertions(+), 14 deletions(-) diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c index a6dd614..16ea319 100644 --- a/arch/m68k/kernel/signal.c +++ b/arch/m68k/kernel/signal.c @@ -761,10 +761,8 @@ static int setup_frame (int sig, struct k_sigaction *ka, frame = get_sigframe(ka, regs, sizeof(*frame) + fsize); - if (fsize) { + if (fsize) err |= copy_to_user (frame + 1, regs + 1, fsize); - regs->stkadj = fsize; - } err |= __put_user((current_thread_info()->exec_domain && current_thread_info()->exec_domain->signal_invmap @@ -794,11 +792,21 @@ static int setup_frame (int sig, struct k_sigaction *ka, push_cache ((unsigned long) &frame->retcode); - /* Set up registers for signal handler */ + /* + * Set up registers for signal handler. All the state we are about + * to destroy is successfully copied to sigframe. + */ wrusp ((unsigned long) frame); regs->pc = (unsigned long) ka->sa.sa_handler; -adjust_stack: + /* + * This is subtle; if we build more than one sigframe, all but the + * first one will see frame format 0 and have fsize == 0, so we won't + * screw stkadj. + */ + if (fsize) + regs->stkadj = fsize; + /* Prepare to skip over the extra stuff in the exception frame. */ if (regs->stkadj) { struct pt_regs *tregs = @@ -813,11 +821,11 @@ adjust_stack: tregs->pc = regs->pc; tregs->sr = regs->sr; } - return err; + return 0; give_sigsegv: force_sigsegv(sig, current); - goto adjust_stack; + return err; } static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, @@ -837,10 +845,8 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, frame = get_sigframe(ka, regs, sizeof(*frame)); - if (fsize) { + if (fsize) err |= copy_to_user (&frame->uc.uc_extra, regs + 1, fsize); - regs->stkadj = fsize; - } err |= __put_user((current_thread_info()->exec_domain && current_thread_info()->exec_domain->signal_invmap @@ -882,11 +888,21 @@ static int setup_rt_frame (int sig, struct k_sigaction *ka, siginfo_t *info, push_cache ((unsigned long) &frame->retcode); - /* Set up registers for signal handler */ + /* + * Set up registers for signal handler. All the state we are about + * to destroy is successfully copied to sigframe. + */ wrusp ((unsigned long) frame); regs->pc = (unsigned long) ka->sa.sa_handler; -adjust_stack: + /* + * This is subtle; if we build more than one sigframe, all but the + * first one will see frame format 0 and have fsize == 0, so we won't + * screw stkadj. + */ + if (fsize) + regs->stkadj = fsize; + /* Prepare to skip over the extra stuff in the exception frame. */ if (regs->stkadj) { struct pt_regs *tregs = @@ -901,11 +917,11 @@ adjust_stack: tregs->pc = regs->pc; tregs->sr = regs->sr; } - return err; + return 0; give_sigsegv: force_sigsegv(sig, current); - goto adjust_stack; + return err; } static inline void -- 1.5.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
