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kprobes: Improve smoke test to check preemptibility 

Add preemptible check to each handler. Handlers are called with
non-preemtible, which is guaranteed by Documentation/kprobes.txt.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexei Starovoitov <ast@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/150581513991.32348.7956810394499654272.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Masami Hiramatsu 2017-09-19 18:59:00 +09:00 committed by Ingo Molnar
parent a8976fc84b
commit 3539d09154
1 changed files with 20 additions and 0 deletions
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20
kernel/test_kprobes.c
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@ -34,6 +34,10 @@ static noinline u32 kprobe_target(u32 value)
static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs) static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
{ {
if (preemptible()) {
handler_errors++;
pr_err("pre-handler is preemptible\n");
}
preh_val = (rand1 / div_factor); preh_val = (rand1 / div_factor);
return 0; return 0;
} }
@ -41,6 +45,10 @@ static int kp_pre_handler(struct kprobe *p, struct pt_regs *regs)
static void kp_post_handler(struct kprobe *p, struct pt_regs *regs, static void kp_post_handler(struct kprobe *p, struct pt_regs *regs,
unsigned long flags) unsigned long flags)
{ {
if (preemptible()) {
handler_errors++;
pr_err("post-handler is preemptible\n");
}
if (preh_val != (rand1 / div_factor)) { if (preh_val != (rand1 / div_factor)) {
handler_errors++; handler_errors++;
pr_err("incorrect value in post_handler\n"); pr_err("incorrect value in post_handler\n");
@ -156,6 +164,10 @@ static int test_kprobes(void)
static u32 j_kprobe_target(u32 value) static u32 j_kprobe_target(u32 value)
{ {
if (preemptible()) {
handler_errors++;
pr_err("jprobe-handler is preemptible\n");
}
if (value != rand1) { if (value != rand1) {
handler_errors++; handler_errors++;
pr_err("incorrect value in jprobe handler\n"); pr_err("incorrect value in jprobe handler\n");
@ -232,6 +244,10 @@ static u32 krph_val;
static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs) static int entry_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{ {
if (preemptible()) {
handler_errors++;
pr_err("kretprobe entry handler is preemptible\n");
}
krph_val = (rand1 / div_factor); krph_val = (rand1 / div_factor);
return 0; return 0;
} }
@ -240,6 +256,10 @@ static int return_handler(struct kretprobe_instance *ri, struct pt_regs *regs)
{ {
unsigned long ret = regs_return_value(regs); unsigned long ret = regs_return_value(regs);
if (preemptible()) {
handler_errors++;
pr_err("kretprobe return handler is preemptible\n");
}
if (ret != (rand1 / div_factor)) { if (ret != (rand1 / div_factor)) {
handler_errors++; handler_errors++;
pr_err("incorrect value in kretprobe handler\n"); pr_err("incorrect value in kretprobe handler\n");