* [PATCH]kprobe handler discard user space trap
@ 2006-02-27 1:18 bibo,mao
0 siblings, 0 replies; only message in thread
From: bibo,mao @ 2006-02-27 1:18 UTC (permalink / raw)
To: systemtap; +Cc: Keshavamurthy, Anil S, prasanna, Zhang, Yanmin
Hi,
Currently kprobe handler mainly is for trap happening in kernel space,
and if it happens in user space, it need uprobe to handle it, that is
future feature. So user BREAK trap happens in user space, kprobe just
skips it. Here is the patch, any suggestion is welcome.
thanks
bibo,mao
diff -Nruap a/arch/i386/kernel/kprobes.c b/arch/i386/kernel/kprobes.c
--- a/arch/i386/kernel/kprobes.c 2006-02-25 17:08:52.000000000 +0800
+++ b/arch/i386/kernel/kprobes.c 2006-02-25 18:02:15.000000000 +0800
@@ -465,7 +465,7 @@ int __kprobes kprobe_exceptions_notify(s
switch (val) {
case DIE_INT3:
- if (kprobe_handler(args->regs))
+ if (!user_mode(args->regs) && kprobe_handler(args->regs))
ret = NOTIFY_STOP;
break;
case DIE_DEBUG:
diff -Nruap a/arch/ia64/kernel/kprobes.c b/arch/ia64/kernel/kprobes.c
--- a/arch/ia64/kernel/kprobes.c 2006-02-25 17:08:53.000000000 +0800
+++ b/arch/ia64/kernel/kprobes.c 2006-02-28 08:53:49.000000000 +0800
@@ -743,7 +743,7 @@ int __kprobes kprobe_exceptions_notify(s
switch(val) {
case DIE_BREAK:
/* err is break number from ia64_bad_break() */
- if (args->err == 0x80200 || args->err == 0x80300 || args->err == 0)
+ if (!user_mode(args->regs) && (args->err == 0x80200 || args->err ==
0x80300 || args->err == 0))
if (pre_kprobes_handler(args))
ret = NOTIFY_STOP;
break;
diff -Nruap a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
--- a/arch/powerpc/kernel/kprobes.c 2006-02-25 17:08:52.000000000 +0800
+++ b/arch/powerpc/kernel/kprobes.c 2006-02-28 08:54:53.000000000 +0800
@@ -399,7 +399,7 @@ int __kprobes kprobe_exceptions_notify(s
switch (val) {
case DIE_BPT:
- if (kprobe_handler(args->regs))
+ if (!user_mode(args->regs) && kprobe_handler(args->regs))
ret = NOTIFY_STOP;
break;
case DIE_SSTEP:
diff -Nruap a/arch/sparc64/kernel/kprobes.c b/arch/sparc64/kernel/kprobes.c
--- a/arch/sparc64/kernel/kprobes.c 2006-02-25 17:08:52.000000000 +0800
+++ b/arch/sparc64/kernel/kprobes.c 2006-02-28 08:54:23.000000000 +0800
@@ -326,7 +326,7 @@ int __kprobes kprobe_exceptions_notify(s
switch (val) {
case DIE_DEBUG:
- if (kprobe_handler(args->regs))
+ if (!user_mode(args->regs) && kprobe_handler(args->regs))
ret = NOTIFY_STOP;
break;
case DIE_DEBUG_2:
diff -Nruap a/arch/x86_64/kernel/kprobes.c b/arch/x86_64/kernel/kprobes.c
--- a/arch/x86_64/kernel/kprobes.c 2006-02-25 17:08:52.000000000 +0800
+++ b/arch/x86_64/kernel/kprobes.c 2006-02-25 18:02:33.000000000 +0800
@@ -603,7 +603,7 @@ int __kprobes kprobe_exceptions_notify(s
switch (val) {
case DIE_INT3:
- if (kprobe_handler(args->regs))
+ if (!user_mode(args->regs) && kprobe_handler(args->regs))
ret = NOTIFY_STOP;
break;
case DIE_DEBUG:
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