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authorMichael Ellerman <michael@ellerman.id.au>2007-07-19 04:48:11 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:04:44 -0400
commit3d7e33825d8799115dd2495c9944badd3272a623 (patch)
tree869eeefa9dd88c622db199f636cd1785c6099947 /include
parent9e367d859297b9377d65574f538cf52730e9eda8 (diff)
jprobes: make jprobes a little safer for users
I realise jprobes are a razor-blades-included type of interface, but that doesn't mean we can't try and make them safer to use. This guy I know once wrote code like this: struct jprobe jp = { .kp.symbol_name = "foo", .entry = "jprobe_foo" }; And then his kernel exploded. Oops. This patch adds an arch hook, arch_deref_entry_point() (I don't like it either) which takes the void * in a struct jprobe, and gives back the text address that it represents. We can then use that in register_jprobe() to check that the entry point we're passed is actually in the kernel text, rather than just some random value. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com> Acked-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/kprobes.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index bd892850c94a..51464d12a4e5 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -214,6 +214,7 @@ int longjmp_break_handler(struct kprobe *, struct pt_regs *);
214int register_jprobe(struct jprobe *p); 214int register_jprobe(struct jprobe *p);
215void unregister_jprobe(struct jprobe *p); 215void unregister_jprobe(struct jprobe *p);
216void jprobe_return(void); 216void jprobe_return(void);
217unsigned long arch_deref_entry_point(void *);
217 218
218int register_kretprobe(struct kretprobe *rp); 219int register_kretprobe(struct kretprobe *rp);
219void unregister_kretprobe(struct kretprobe *rp); 220void unregister_kretprobe(struct kretprobe *rp);