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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2017-02-22 16:53:37 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2017-03-04 01:07:17 +0300
commit90ec5e89e393c76e19afc845d8f88a5dc8315919 (patch)
tree95fe1e1d60938f6a3102ce9bbff8ed99cdb072b4 /include/linux/kprobes.h
parent583359646fde8526ea9456618cc24dc359b34094 (diff)
downloadlinux-90ec5e89e393c76e19afc845d8f88a5dc8315919.tar.xz
kretprobes: Ensure probe location is at function entry
kretprobes can be registered by specifying an absolute address or by specifying offset to a symbol. However, we need to ensure this falls at function entry so as to be able to determine the return address. Validate the same during kretprobe registration. By default, there should not be any offset from a function entry, as determined through a kallsyms_lookup(). Introduce arch_function_offset_within_entry() as a way for architectures to override this. Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/f1583bc4839a3862cfc2acefcc56f9c8837fa2ba.1487770934.git.naveen.n.rao@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'include/linux/kprobes.h')
-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 c328e4f7dcad..177bdf6c6aeb 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -267,6 +267,7 @@ extern int arch_init_kprobes(void);
extern void show_registers(struct pt_regs *regs);
extern void kprobes_inc_nmissed_count(struct kprobe *p);
extern bool arch_within_kprobe_blacklist(unsigned long addr);
+extern bool arch_function_offset_within_entry(unsigned long offset);
extern bool within_kprobe_blacklist(unsigned long addr);