kprobes: Search non-suffixed symbol in blacklist

Newer GCC versions can generate some different instances of a function
with suffixed symbols if the function is optimized and only
has a part of that. (e.g. .constprop, .part etc.)

In this case, it is not enough to check the entry of kprobe
blacklist because it only records non-suffixed symbol address.

To fix this issue, search non-suffixed symbol in blacklist if
given address is within a symbol which has a suffix.

Note that this can cause false positive cases if a kprobe-safe
function is optimized to suffixed instance and has same name
symbol which is blacklisted.
But I would like to chose a fail-safe design for this issue.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrea Righi <righi.andrea@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.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/154998799234.31052.6136378903570418008.stgit@devbox
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index f4ddfdd2d07e..c83e54727131 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1396,7 +1396,7 @@ bool __weak arch_within_kprobe_blacklist(unsigned long addr)
                addr < (unsigned long)__kprobes_text_end;
 }
 
-bool within_kprobe_blacklist(unsigned long addr)
+static bool __within_kprobe_blacklist(unsigned long addr)
 {
         struct kprobe_blacklist_entry *ent;
 
@@ -1410,7 +1410,26 @@ bool within_kprobe_blacklist(unsigned long addr)
                 if (addr >= ent->start_addr && addr < ent->end_addr)
                         return true;
         }
+        return false;
+}
 
+bool within_kprobe_blacklist(unsigned long addr)
+{
+        char symname[KSYM_NAME_LEN], *p;
+
+        if (__within_kprobe_blacklist(addr))
+                return true;
+
+        /* Check if the address is on a suffixed-symbol */
+        if (!lookup_symbol_name(addr, symname)) {
+                p = strchr(symname, '.');
+                if (!p)
+                        return false;
+                *p = '\0';
+                addr = (unsigned long)kprobe_lookup_name(symname, 0);
+                if (addr)
+                        return __within_kprobe_blacklist(addr);
+        }
         return false;
 }