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kprobes: Simplify register_jprobes()

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Re-factor jprobe registration functions as the current version is
getting too unwieldy. Move the actual jprobe registration to
register_jprobe() and re-organize code accordingly.

Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/089cae4bfe73767f765291ee0e6fb0c3d240e5f1.1499443367.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Naveen N. Rao 2017-07-07 22:37:25 +05:30 committed by Ingo Molnar
parent 659b957f20
commit 0f73ff80b7
1 changed files with 16 additions and 14 deletions
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30
kernel/kprobes.c
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@ -1771,24 +1771,13 @@ unsigned long __weak arch_deref_entry_point(void *entry)
int register_jprobes(struct jprobe **jps, int num)
{
struct jprobe *jp;
int ret = 0, i;
if (num <= 0)
return -EINVAL;
for (i = 0; i < num; i++) {
unsigned long addr, offset;
jp = jps[i];
addr = arch_deref_entry_point(jp->entry);
/* Verify probepoint is a function entry point */
if (kallsyms_lookup_size_offset(addr, NULL, &offset) &&
offset == 0) {
jp->kp.pre_handler = setjmp_pre_handler;
jp->kp.break_handler = longjmp_break_handler;
ret = register_kprobe(&jp->kp);
} else
ret = -EINVAL;
for (i = 0; i < num; i++) {
ret = register_jprobe(jps[i]);
if (ret < 0) {
if (i > 0)
@ -1796,13 +1785,26 @@ int register_jprobes(struct jprobe **jps, int num)
break;
}
}
return ret;
}
EXPORT_SYMBOL_GPL(register_jprobes);
int register_jprobe(struct jprobe *jp)
{
return register_jprobes(&jp, 1);
unsigned long addr, offset;
struct kprobe *kp = &jp->kp;
/* Verify probepoint is a function entry point */
addr = arch_deref_entry_point(jp->entry);
if (kallsyms_lookup_size_offset(addr, NULL, &offset) && offset == 0) {
kp->pre_handler = setjmp_pre_handler;
kp->break_handler = longjmp_break_handler;
return register_kprobe(kp);
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(register_jprobe);