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Message-Id: <20190907061124.1947-2-cmr@informatik.wtf>
Date: Sat, 7 Sep 2019 01:11:23 -0500
From: "Christopher M. Riedl" <cmr@...ormatik.wtf>
To: linuxppc-dev@...abs.org,
kernel-hardening@...ts.openwall.com
Cc: ajd@...ux.ibm.com,
dja@...ens.net
Subject: [PATCH v7 1/2] powerpc/xmon: Allow listing and clearing breakpoints in read-only mode
Read-only mode should not prevent listing and clearing any active
breakpoints.
Tested-by: Daniel Axtens <dja@...ens.net>
Reviewed-by: Daniel Axtens <dja@...ens.net>
Signed-off-by: Christopher M. Riedl <cmr@...ormatik.wtf>
---
arch/powerpc/xmon/xmon.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index d0620d762a5a..ed94de614938 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -1045,10 +1045,6 @@ cmds(struct pt_regs *excp)
set_lpp_cmd();
break;
case 'b':
- if (xmon_is_ro) {
- printf(xmon_ro_msg);
- break;
- }
bpt_cmds();
break;
case 'C':
@@ -1317,11 +1313,16 @@ bpt_cmds(void)
struct bpt *bp;
cmd = inchar();
+
switch (cmd) {
#ifndef CONFIG_PPC_8xx
static const char badaddr[] = "Only kernel addresses are permitted for breakpoints\n";
int mode;
case 'd': /* bd - hardware data breakpoint */
+ if (xmon_is_ro) {
+ printf(xmon_ro_msg);
+ break;
+ }
if (!ppc_breakpoint_available()) {
printf("Hardware data breakpoint not supported on this cpu\n");
break;
@@ -1349,6 +1350,10 @@ bpt_cmds(void)
break;
case 'i': /* bi - hardware instr breakpoint */
+ if (xmon_is_ro) {
+ printf(xmon_ro_msg);
+ break;
+ }
if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
printf("Hardware instruction breakpoint "
"not supported on this cpu\n");
@@ -1407,7 +1412,8 @@ bpt_cmds(void)
break;
}
termch = cmd;
- if (!scanhex(&a)) {
+
+ if (xmon_is_ro || !scanhex(&a)) {
/* print all breakpoints */
printf(" type address\n");
if (dabr.enabled) {
--
2.23.0
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