linux-toradex.git/kernel/kprobes.c, branch v2.6.18

[PATCH] IA64: kprobe invalidate icache of jump buffer

2006-07-31T20:28:38+00:00

Kprobe inserts breakpoint instruction in probepoint and then jumps to
instruction slot when breakpoint is hit, the instruction slot icache must
be consistent with dcache.  Here is the patch which invalidates instruction
slot icache area.

Without this patch, in some machines there will be fault when executing
instruction slot where icache content is inconsistent with dcache.

Signed-off-by: bibo,mao 
Acked-by: "Luck, Tony" 
Acked-by: Keshavamurthy Anil S 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Notify page fault call chain

2006-06-26T16:58:22+00:00

With this patch Kprobes now registers for page fault notifications only when
their is an active probe registered.  Once all the active probes are
unregistered their is no need to be notified of page faults and kprobes
unregisters itself from the page fault notifications.  Hence we will have ZERO
side effects when no probes are active.

Signed-off-by: Anil S Keshavamurthy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Kprobes registers for notify page fault

2006-06-26T16:58:22+00:00

Kprobes now registers for page fault notifications.

Signed-off-by: Anil S Keshavamurthy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Kprobe: multi kprobe posthandler for booster

2006-06-26T16:58:22+00:00

If there are multi kprobes on the same probepoint, there will be one extra
aggr_kprobe on the head of kprobe list.  The aggr_kprobe has
aggr_post_handler/aggr_break_handler whether the other kprobe
post_hander/break_handler is NULL or not.  This patch modifies this, only
when there is one or more kprobe in the list whose post_handler is not
NULL, post_handler of aggr_kprobe will be set as aggr_post_handler.

[soshima@redhat.com: !CONFIG_PREEMPT fix]
Signed-off-by: bibo, mao 
Cc: Masami Hiramatsu 
Cc: Ananth N Mavinakayanahalli 
Cc: "Keshavamurthy, Anil S" 
Cc: Prasanna S Panchamukhi 
Cc: Jim Keniston 
Cc: Yumiko Sugita 
Cc: Hideo Aoki 
Signed-off-by: Satoshi Oshima 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kprobes: NULL out non-relevant fields in struct kretprobe

2006-04-20T14:54:03+00:00

In cases where a struct kretprobe's *_handler fields are non-NULL, it is
possible to cause a system crash, due to the possibility of calls ending up
in zombie functions.  Documentation clearly states that unused *_handlers
should be set to NULL, but kprobe users sometimes fail to do so.

Fix it by setting the non-relevant fields of the struct kretprobe to NULL.

Signed-off-by: Ananth N Mavinakayanahalli 
Acked-by: Jim Keniston 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kretprobe instance recycled by parent process

2006-03-26T16:57:04+00:00

When kretprobe probes the schedule() function, if the probed process exits
then schedule() will never return, so some kretprobe instances will never
be recycled.

In this patch the parent process will recycle retprobe instances of the
probed function and there will be no memory leak of kretprobe instances.

Signed-off-by: bibo mao 
Cc: Masami Hiramatsu 
Cc: Prasanna S Panchamukhi 
Cc: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] sem2mutex: kprobes

2006-03-23T15:38:12+00:00

Semaphore to mutex conversion.

The conversion was generated via scripts, and the result was validated
automatically via a script as well.

Signed-off-by: Ingo Molnar 
Acked-by: Anil S Keshavamurthy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Kprobes: Fix deadlock in function-return probes

2006-02-03T16:32:00+00:00

When two function-return probes are inserted on kfree()[1] and the second
on say, sys_link()[2], and later [2] is unregistered, we have a deadlock as
kfree is called with the kretprobe_lock held and the function-return probe
on kfree will also try to grab the same lock.

However, we can move the kfree() during unregistration to outside the
spinlock as we are sure that no instances from the free list will be used
after synchronized_sched() returns during the unregistration process.
Thanks to Masami Hiramatsu for spotting this.

Signed-off-by: Ananth N Mavinakayanahalli 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kernel/kprobes.c: fix a warning #ifndef ARCH_SUPPORTS_KRETPROBES

2006-02-03T16:32:00+00:00

kernel/kprobes.c:353: warning: 'pre_handler_kretprobe' defined but not used

Signed-off-by: Adrian Bunk 
Acked-by: Ananth N Mavinakayanahalli 
Acked-by: "Keshavamurthy, Anil S" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kprobes: fix unloading of self probed module

2006-01-12T02:42:12+00:00

When a kprobes modules is written in such a way that probes are inserted on
itself, then unload of that moudle was not possible due to reference
couning on the same module.

The below patch makes a check and incrementes the module refcount only if
it is not a self probed module.

We need to allow modules to probe themself for kprobes performance
measurements

This patch has been tested on several x86_64, ppc64 and IA64 architectures.

Signed-off-by: Anil S Keshavamurthy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds