diff mbox series

[for-5.2,3/3] hmp: Pass monitor to mon_get_cpu_env()

Message ID 20201113114326.97663-4-kwolf@redhat.com (mailing list archive)
State New, archived
Headers show
Series hmp: Fix arg evaluation crash (regression) | expand

Commit Message

Kevin Wolf Nov. 13, 2020, 11:43 a.m. UTC
mon_get_cpu_env() is indirectly called monitor_parse_arguments() where
the current monitor isn't set yet. Instead of using monitor_cur_env(),
explicitly pass the Monitor pointer to the function.

Without this fix, an HMP command like "x $pc" crashes like this:

  #0  0x0000555555caa01f in mon_get_cpu_sync (mon=0x0, synchronize=true) at ../monitor/misc.c:270
  #1  0x0000555555caa141 in mon_get_cpu (mon=0x0) at ../monitor/misc.c:294
  #2  0x0000555555caa158 in mon_get_cpu_env () at ../monitor/misc.c:299
  #3  0x0000555555b19739 in monitor_get_pc (mon=0x555556ad2de0, md=0x5555565d2d40 <monitor_defs+1152>, val=0) at ../target/i386/monitor.c:607
  #4  0x0000555555cadbec in get_monitor_def (mon=0x555556ad2de0, pval=0x7fffffffc208, name=0x7fffffffc220 "pc") at ../monitor/misc.c:1681
  #5  0x000055555582ec4f in expr_unary (mon=0x555556ad2de0) at ../monitor/hmp.c:387
  #6  0x000055555582edbb in expr_prod (mon=0x555556ad2de0) at ../monitor/hmp.c:421
  #7  0x000055555582ee79 in expr_logic (mon=0x555556ad2de0) at ../monitor/hmp.c:455
  #8  0x000055555582eefe in expr_sum (mon=0x555556ad2de0) at ../monitor/hmp.c:484
  #9  0x000055555582efe8 in get_expr (mon=0x555556ad2de0, pval=0x7fffffffc418, pp=0x7fffffffc408) at ../monitor/hmp.c:511
  #10 0x000055555582fcd4 in monitor_parse_arguments (mon=0x555556ad2de0, endp=0x7fffffffc890, cmd=0x555556675b50 <hmp_cmds+7920>) at ../monitor/hmp.c:876
  #11 0x00005555558306a8 in handle_hmp_command (mon=0x555556ad2de0, cmdline=0x555556ada452 "$pc") at ../monitor/hmp.c:1087
  #12 0x000055555582df14 in monitor_command_cb (opaque=0x555556ad2de0, cmdline=0x555556ada450 "x $pc", readline_opaque=0x0) at ../monitor/hmp.c:47

After this fix, nothing is left in monitor_parse_arguments() that can
indirectly call monitor_cur(), so the fix is complete.

Fixes: ff04108a0e36e822519c517bd3bddbc1c7747c18
Reported-by: lichun <lichun@ruijie.com.cn>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 include/monitor/hmp-target.h |  2 +-
 monitor/misc.c               |  6 +++---
 target/i386/monitor.c        |  6 +++---
 target/m68k/monitor.c        |  2 +-
 target/nios2/monitor.c       |  2 +-
 target/ppc/monitor.c         | 10 +++++-----
 target/riscv/monitor.c       |  2 +-
 target/sh4/monitor.c         |  2 +-
 target/sparc/monitor.c       |  6 +++---
 target/xtensa/monitor.c      |  2 +-
 10 files changed, 20 insertions(+), 20 deletions(-)
diff mbox series

Patch

diff --git a/include/monitor/hmp-target.h b/include/monitor/hmp-target.h
index 385fb18664..60fc92722a 100644
--- a/include/monitor/hmp-target.h
+++ b/include/monitor/hmp-target.h
@@ -41,7 +41,7 @@  struct MonitorDef {
 const MonitorDef *target_monitor_defs(void);
 int target_get_monitor_def(CPUState *cs, const char *name, uint64_t *pval);
 
-CPUArchState *mon_get_cpu_env(void);
+CPUArchState *mon_get_cpu_env(Monitor *mon);
 CPUState *mon_get_cpu(Monitor *mon);
 
 void hmp_info_mem(Monitor *mon, const QDict *qdict);
diff --git a/monitor/misc.c b/monitor/misc.c
index f566e28174..398211a034 100644
--- a/monitor/misc.c
+++ b/monitor/misc.c
@@ -294,9 +294,9 @@  CPUState *mon_get_cpu(Monitor *mon)
     return mon_get_cpu_sync(mon, true);
 }
 
-CPUArchState *mon_get_cpu_env(void)
+CPUArchState *mon_get_cpu_env(Monitor *mon)
 {
-    CPUState *cs = mon_get_cpu(monitor_cur());
+    CPUState *cs = mon_get_cpu(mon);
 
     return cs ? cs->env_ptr : NULL;
 }
@@ -1680,7 +1680,7 @@  int get_monitor_def(Monitor *mon, int64_t *pval, const char *name)
             if (md->get_value) {
                 *pval = md->get_value(mon, md, md->offset);
             } else {
-                CPUArchState *env = mon_get_cpu_env();
+                CPUArchState *env = mon_get_cpu_env(mon);
                 ptr = (uint8_t *)env + md->offset;
                 switch(md->type) {
                 case MD_I32:
diff --git a/target/i386/monitor.c b/target/i386/monitor.c
index fed4606aeb..9f9e1c42f4 100644
--- a/target/i386/monitor.c
+++ b/target/i386/monitor.c
@@ -222,7 +222,7 @@  void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
     CPUArchState *env;
 
-    env = mon_get_cpu_env();
+    env = mon_get_cpu_env(mon);
     if (!env) {
         monitor_printf(mon, "No CPU available\n");
         return;
@@ -550,7 +550,7 @@  void hmp_info_mem(Monitor *mon, const QDict *qdict)
 {
     CPUArchState *env;
 
-    env = mon_get_cpu_env();
+    env = mon_get_cpu_env(mon);
     if (!env) {
         monitor_printf(mon, "No CPU available\n");
         return;
@@ -604,7 +604,7 @@  void hmp_mce(Monitor *mon, const QDict *qdict)
 static target_long monitor_get_pc(Monitor *mon, const struct MonitorDef *md,
                                   int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     return env->eip + env->segs[R_CS].base;
 }
 
diff --git a/target/m68k/monitor.c b/target/m68k/monitor.c
index 2055fe8a00..2bdf6acae0 100644
--- a/target/m68k/monitor.c
+++ b/target/m68k/monitor.c
@@ -12,7 +12,7 @@ 
 
 void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
-    CPUArchState *env1 = mon_get_cpu_env();
+    CPUArchState *env1 = mon_get_cpu_env(mon);
 
     if (!env1) {
         monitor_printf(mon, "No CPU available\n");
diff --git a/target/nios2/monitor.c b/target/nios2/monitor.c
index 6646836df5..0152dec3fa 100644
--- a/target/nios2/monitor.c
+++ b/target/nios2/monitor.c
@@ -29,7 +29,7 @@ 
 
 void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
-    CPUArchState *env1 = mon_get_cpu_env();
+    CPUArchState *env1 = mon_get_cpu_env(mon);
 
     dump_mmu(env1);
 }
diff --git a/target/ppc/monitor.c b/target/ppc/monitor.c
index 9c0fc2b8c3..a475108b2d 100644
--- a/target/ppc/monitor.c
+++ b/target/ppc/monitor.c
@@ -32,7 +32,7 @@ 
 static target_long monitor_get_ccr(Monitor *mon, const struct MonitorDef *md,
                                    int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     unsigned int u;
     int i;
 
@@ -47,27 +47,27 @@  static target_long monitor_get_ccr(Monitor *mon, const struct MonitorDef *md,
 static target_long monitor_get_decr(Monitor *mon, const struct MonitorDef *md,
                                     int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     return cpu_ppc_load_decr(env);
 }
 
 static target_long monitor_get_tbu(Monitor *mon, const struct MonitorDef *md,
                                    int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     return cpu_ppc_load_tbu(env);
 }
 
 static target_long monitor_get_tbl(Monitor *mon, const struct MonitorDef *md,
                                    int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     return cpu_ppc_load_tbl(env);
 }
 
 void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
-    CPUArchState *env1 = mon_get_cpu_env();
+    CPUArchState *env1 = mon_get_cpu_env(mon);
 
     if (!env1) {
         monitor_printf(mon, "No CPU available\n");
diff --git a/target/riscv/monitor.c b/target/riscv/monitor.c
index b569f08387..e51188f919 100644
--- a/target/riscv/monitor.c
+++ b/target/riscv/monitor.c
@@ -204,7 +204,7 @@  void hmp_info_mem(Monitor *mon, const QDict *qdict)
 {
     CPUArchState *env;
 
-    env = mon_get_cpu_env();
+    env = mon_get_cpu_env(mon);
     if (!env) {
         monitor_printf(mon, "No CPU available\n");
         return;
diff --git a/target/sh4/monitor.c b/target/sh4/monitor.c
index 918a5ccfc6..2da6a5426e 100644
--- a/target/sh4/monitor.c
+++ b/target/sh4/monitor.c
@@ -41,7 +41,7 @@  static void print_tlb(Monitor *mon, int idx, tlb_t *tlb)
 
 void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     int i;
 
     if (!env) {
diff --git a/target/sparc/monitor.c b/target/sparc/monitor.c
index bf979d6520..318413686a 100644
--- a/target/sparc/monitor.c
+++ b/target/sparc/monitor.c
@@ -30,7 +30,7 @@ 
 
 void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
-    CPUArchState *env1 = mon_get_cpu_env();
+    CPUArchState *env1 = mon_get_cpu_env(mon);
 
     if (!env1) {
         monitor_printf(mon, "No CPU available\n");
@@ -43,7 +43,7 @@  void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 static target_long monitor_get_psr(Monitor *mon, const struct MonitorDef *md,
                                    int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
 
     return cpu_get_psr(env);
 }
@@ -52,7 +52,7 @@  static target_long monitor_get_psr(Monitor *mon, const struct MonitorDef *md,
 static target_long monitor_get_reg(Monitor *mon, const struct MonitorDef *md,
                                    int val)
 {
-    CPUArchState *env = mon_get_cpu_env();
+    CPUArchState *env = mon_get_cpu_env(mon);
     return env->regwptr[val];
 }
 
diff --git a/target/xtensa/monitor.c b/target/xtensa/monitor.c
index 608173c238..fbf60d5553 100644
--- a/target/xtensa/monitor.c
+++ b/target/xtensa/monitor.c
@@ -29,7 +29,7 @@ 
 
 void hmp_info_tlb(Monitor *mon, const QDict *qdict)
 {
-    CPUArchState *env1 = mon_get_cpu_env();
+    CPUArchState *env1 = mon_get_cpu_env(mon);
 
     if (!env1) {
         monitor_printf(mon, "No CPU available\n");