s390/kprobes: add exrl to list of prohibited opcodes (74234355) · Commits · e / devices / android_kernel_teracube_2e

"execute relative long" may have all sorts of side effects dependend on the instructions it executes. Therefore prohibit setting a kprobe on exrl just like we do for the regular execute instruction. Signed-off-by:

Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by:

Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/kprobes.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -67,6 +67,11 @@ static int __kprobes is_prohibited_opcode(kprobe_opcode_t *insn)
		case 0xac: /* stnsm */
		case 0xad: /* stosm */
		return -EINVAL;
		case 0xc6:
		switch (insn[0] & 0x0f) {
		case 0x00: /* exrl */
		return -EINVAL;
		}
		}
		switch (insn[0]) {
		case 0x0101: /* pr */
		@@ -180,7 +185,6 @@ static int __kprobes is_insn_relative_long(kprobe_opcode_t *insn)
		break;
		case 0xc6:
		switch (insn[0] & 0x0f) {
		case 0x00: /* exrl */
		case 0x02: /* pfdrl */
		case 0x04: /* cghrl */
		case 0x05: /* chrl */