[PATCH 5.15 261/279] signal/sparc32: In setup_rt_frame and setup_fram use force_fatal_sig

Greg Kroah-Hartman
2021-11-24T14:09:13Z

From: Eric W. Biederman <ebiederm@xmission.com>

commit 086ec444f86660e103de8945d0dcae9b67132ac9 upstream.

Modify the 32bit version of setup_rt_frame and setup_frame to act
similar to the 64bit version of setup_rt_frame and fail with a signal
instead of calling do_exit.

Replacing do_exit(SIGILL) with force_fatal_signal(SIGILL) ensures that
the process will be terminated cleanly when the stack frame is
invalid, instead of just killing off a single thread and leaving the
process is a weird state.

Cc: David Miller <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
Link: https://lkml.kernel.org/r/20211020174406.17889-16-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Thomas Backlund <tmb@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/sparc/kernel/signal_32.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/sparc/kernel/signal_32.c
+++ b/arch/sparc/kernel/signal_32.c
@@ -244,7 +244,7 @@ static int setup_frame(struct ksignal *k
get_sigframe(ksig, regs, sigframe_size);

if (invalid_frame_pointer(sf, sigframe_size)) {
- do_exit(SIGILL);
+ force_fatal_sig(SIGILL);
return -EINVAL;
}

@@ -336,7 +336,7 @@ static int setup_rt_frame(struct ksignal
sf = (struct rt_signal_frame __user *)
get_sigframe(ksig, regs, sigframe_size);
if (invalid_frame_pointer(sf, sigframe_size)) {
- do_exit(SIGILL);
+ force_fatal_sig(SIGILL);
return -EINVAL;
}