linux.git/kernel/kprobes.c, branch v2.6.26-rc2

kprobes: add (un)register_jprobes for batch registration

2008-04-28T15:58:32+00:00

Introduce unregister_/register_jprobes() for jprobe batch registration.

Signed-off-by: Masami Hiramatsu 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Cc: Prasanna S Panchamukhi 
Cc: Shaohua Li 
Cc: David Miller 
Cc: "Frank Ch. Eigler" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: add (un)register_kretprobes for batch registration

2008-04-28T15:58:32+00:00

Introduce unregister_/register_kretprobes() for kretprobe batch registration.

Signed-off-by: Masami Hiramatsu 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Cc: Prasanna S Panchamukhi 
Cc: Shaohua Li 
Cc: David Miller 
Cc: "Frank Ch. Eigler" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: add (un)register_kprobes for batch registration

2008-04-28T15:58:32+00:00

Introduce unregister_/register_kprobes() for kprobe batch registration.  This
can reduce waiting time for synchronized_sched() when a lot of probes have to
be unregistered at once.

Signed-off-by: Masami Hiramatsu 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Cc: Prasanna S Panchamukhi 
Cc: Shaohua Li 
Cc: David Miller 
Cc: "Frank Ch. Eigler" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: prevent probing of preempt_schedule()

2008-04-28T15:58:32+00:00

Prohibit users from probing preempt_schedule().  One way of prohibiting the
user from probing functions is by marking such functions with __kprobes.  But
this method doesn't work for those functions, which are already marked to
different section like preempt_schedule() (belongs to __sched section).  So we
use blacklist approach to refuse user from probing these functions.

In blacklist approach we populate the blacklisted function's starting address
and its size in kprobe_blacklist structure.  Then we verify the user specified
address against start and end of the blacklisted function.  So any attempt to
register probe on blacklisted functions will be rejected.

[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Srinivasa DS 
Signed-off-by: Ananth N Mavinakayanahalli 
Signed-off-by: Jim Keniston 
Cc: Dave Hansen 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: fix a null pointer bug in register_kretprobe()

2008-03-05T00:35:19+00:00

Fix a bug in regiseter_kretprobe() which does not check rp->kp.symbol_name ==
NULL before calling kprobe_lookup_name.

For maintainability, this introduces kprobe_addr helper function which
resolves addr field.  It is used by register_kprobe and register_kretprobe.

Signed-off-by: Masami Hiramatsu 
Cc: Ananth N Mavinakayanahalli 
Cc: Jim Keniston 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Kprobes: indicate kretprobe support in Kconfig

2008-03-05T00:35:11+00:00

Add CONFIG_HAVE_KRETPROBES to the arch//Kconfig file for relevant
architectures with kprobes support.  This facilitates easy handling of
in-kernel modules (like samples/kprobes/kretprobe_example.c) that depend on
kretprobes being present in the kernel.

Thanks to Sam Ravnborg for helping make the patch more lean.

Per Mathieu's suggestion, added CONFIG_KRETPROBES and fixed up dependencies.

Signed-off-by: Ananth N Mavinakayanahalli 
Acked-by: Mathieu Desnoyers 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

kprobes: kretprobe user entry-handler

2008-02-06T18:41:11+00:00

Provide support to add an optional user defined callback to be run at
function entry of a kretprobe'd function.  Also modify the kprobe smoke
tests to include an entry-handler during the kretprobe sanity test.

Signed-off-by: Abhishek Sagar 
Cc: Prasanna S Panchamukhi 
Cc: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Acked-by: Jim Keniston 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

x86: kprobes: add kprobes smoke tests that run on boot

2008-01-30T12:32:53+00:00

Here is a quick and naive smoke test for kprobes. This is intended to
just verify if some unrelated change broke the *probes subsystem. It is
self contained, architecture agnostic and isn't of any great use by itself.

This needs to be built in the kernel and runs a basic set of tests to
verify if kprobes, jprobes and kretprobes run fine on the kernel. In case
of an error, it'll print out a message with a "BUG" prefix.

This is a start; we intend to add more tests to this bucket over time.

Thanks to Jim Keniston and Masami Hiramatsu for comments and suggestions.

Tested on x86 (32/64) and powerpc.

Signed-off-by: Ananth N Mavinakayanahalli 
Acked-by: Masami Hiramatsu 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

kprobes: support kretprobe blacklist

2007-10-16T16:43:10+00:00

Introduce architecture dependent kretprobe blacklists to prohibit users
from inserting return probes on the function in which kprobes can be
inserted but kretprobes can not.

This patch also removes "__kprobes" mark from "__switch_to" on x86_64 and
registers "__switch_to" to the blacklist on x86-64, because that mark is to
prohibit user from inserting only kretprobe.

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

x86: optimize page faults like all other achitectures and kill notifier cruft

2007-10-16T16:42:50+00:00

x86(-64) are the last architectures still using the page fault notifier
cruft for the kprobes page fault hook.  This patch converts them to the
proper direct calls, and removes the now unused pagefault notifier bits
aswell as the cruft in kprobes.c that was related to this mess.

I know Andi didn't really like this, but all other architecture maintainers
agreed the direct calls are much better and besides the obvious cruft
removal a common way of dealing with kprobes across architectures is
important aswell.

[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: fix sparc64]
Signed-off-by: Christoph Hellwig 
Cc: Andi Kleen 
Cc: 
Cc: Prasanna S Panchamukhi 
Cc: Ananth N Mavinakayanahalli 
Cc: Anil S Keshavamurthy 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds