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authorSrinivasa Ds <srinivasa@in.ibm.com>2008-04-28 05:14:26 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 11:58:32 -0400
commit3d8d996e0ca5b4093203d3f050b0f70b5c949ae8 (patch)
tree2b19d3a47bf723c3bf6ff7c8a0d90078feaee08c /include/linux/kprobes.h
parent0341a4d0fdd2a0a3d9e2bb3a9afef9f8292c8502 (diff)
kprobes: prevent probing of preempt_schedule()
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 <srinivasa@in.ibm.com> Signed-off-by: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Signed-off-by: Jim Keniston <jkenisto@us.ibm.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/kprobes.h')
-rw-r--r--include/linux/kprobes.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 0f28486f6360..cd507ab4fed7 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -173,6 +173,13 @@ struct kretprobe_blackpoint {
173 const char *name; 173 const char *name;
174 void *addr; 174 void *addr;
175}; 175};
176
177struct kprobe_blackpoint {
178 const char *name;
179 unsigned long start_addr;
180 unsigned long range;
181};
182
176extern struct kretprobe_blackpoint kretprobe_blacklist[]; 183extern struct kretprobe_blackpoint kretprobe_blacklist[];
177 184
178static inline void kretprobe_assert(struct kretprobe_instance *ri, 185static inline void kretprobe_assert(struct kretprobe_instance *ri,