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authorPeter Zijlstra <peterz@infradead.org>2021-05-25 09:25:19 +0200
committerPeter Zijlstra <peterz@infradead.org>2021-06-01 16:00:08 +0200
commitec6aba3d2be1ed75b3f4c894bb64a36d40db1f55 (patch)
tree0fd56814090efcd59ce2f2b29906043853764b23 /samples
parent9ce4d216fe8b581e4da4406461a4cfc9acbfa679 (diff)
downloadlinux-ec6aba3d2be1ed75b3f4c894bb64a36d40db1f55.tar.bz2
kprobes: Remove kprobe::fault_handler
The reason for kprobe::fault_handler(), as given by their comment: * We come here because instructions in the pre/post * handler caused the page_fault, this could happen * if handler tries to access user space by * copy_from_user(), get_user() etc. Let the * user-specified handler try to fix it first. Is just plain bad. Those other handlers are ran from non-preemptible context and had better use _nofault() functions. Also, there is no upstream usage of this. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Link: https://lore.kernel.org/r/20210525073213.561116662@infradead.org
Diffstat (limited to 'samples')
-rw-r--r--samples/kprobes/kprobe_example.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c
index c495664c0a9b..4b2f31828951 100644
--- a/samples/kprobes/kprobe_example.c
+++ b/samples/kprobes/kprobe_example.c
@@ -94,26 +94,11 @@ static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
#endif
}
-/*
- * fault_handler: this is called if an exception is generated for any
- * instruction within the pre- or post-handler, or when Kprobes
- * single-steps the probed instruction.
- */
-static int handler_fault(struct kprobe *p, struct pt_regs *regs, int trapnr)
-{
- pr_info("fault_handler: p->addr = 0x%p, trap #%dn", p->addr, trapnr);
- /* Return 0 because we don't handle the fault. */
- return 0;
-}
-/* NOKPROBE_SYMBOL() is also available */
-NOKPROBE_SYMBOL(handler_fault);
-
static int __init kprobe_init(void)
{
int ret;
kp.pre_handler = handler_pre;
kp.post_handler = handler_post;
- kp.fault_handler = handler_fault;
ret = register_kprobe(&kp);
if (ret < 0) {