sparc32: signal: Fix stack trampoline for RT signals

The stack trampoline generated by the sparc32 native version of setup_rt_frame() calls sigreturn(), not rt_sigreturn(). This will crash the task if it's ever used. (glibc sets its own restorer, so was not affected.) The sparc64 compat implementation has the right syscall number. This is untested; I have no way to run a sparc32 kernel. Signed-off-by: Ben Hutchings <[email protected]> Signed-off-by: David S. Miller <[email protected]>
dabrace · Sep 15, 2020 · b6b9b67 · b6b9b67
1 parent 4cc8ca0
commit b6b9b67
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
@@ -401,8 +401,8 @@ static int setup_rt_frame(struct ksignal *ksig, struct pt_regs *regs,
 	else {
 		regs->u_regs[UREG_I7] = (unsigned long)(&(sf->insns[0]) - 2);
 
-		/* mov __NR_sigreturn, %g1 */
-		err |= __put_user(0x821020d8, &sf->insns[0]);
+		/* mov __NR_rt_sigreturn, %g1 */
+		err |= __put_user(0x82102065, &sf->insns[0]);
 
 		/* t 0x10 */
 		err |= __put_user(0x91d02010, &sf->insns[1]);