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Subject[PATCH 3.2 143/153] tracing: probeevent: Fix to support minus offset from symbol
3.2.102-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Masami Hiramatsu <mhiramat@kernel.org>

commit c5d343b6b7badd1f5fe0873eff2e8d63a193e732 upstream.

In Documentation/trace/kprobetrace.txt, it says

@SYM[+|-offs] : Fetch memory at SYM +|- offs (SYM should be a data symbol)

However, the parser doesn't parse minus offset correctly, since
commit 2fba0c8867af ("tracing/kprobes: Fix probe offset to be
unsigned") drops minus ("-") offset support for kprobe probe
address usage.

This fixes the traceprobe_split_symbol_offset() to parse minus
offset again with checking the offset range, and add a minus
offset check in kprobe probe address usage.

Link: http://lkml.kernel.org/r/152129028983.31874.13419301530285775521.stgit@devbox

Cc: Ingo Molnar <mingo@redhat.com>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Fixes: 2fba0c8867af ("tracing/kprobes: Fix probe offset to be unsigned")
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -920,7 +920,7 @@ static struct notifier_block trace_probe
};

/* Split symbol and offset. */
-static int split_symbol_offset(char *symbol, unsigned long *offset)
+static int split_symbol_offset(char *symbol, long *offset)
{
char *tmp;
int ret;
@@ -928,10 +928,9 @@ static int split_symbol_offset(char *sym
if (!offset)
return -EINVAL;

- tmp = strchr(symbol, '+');
+ tmp = strpbrk(symbol, "+-");
if (tmp) {
- /* skip sign because strict_strtol doesn't accept '+' */
- ret = strict_strtoul(tmp + 1, 0, offset);
+ ret = kstrtol(tmp, 0, offset);
if (ret)
return ret;
*tmp = '\0';
@@ -1165,7 +1164,7 @@ static int create_trace_probe(int argc,
int is_return = 0, is_delete = 0;
char *symbol = NULL, *event = NULL, *group = NULL;
char *arg;
- unsigned long offset = 0;
+ long offset = 0;
void *addr = NULL;
char buf[MAX_EVENT_NAME_LEN];

@@ -1238,7 +1237,7 @@ static int create_trace_probe(int argc,
symbol = argv[1];
/* TODO: support .init module functions */
ret = split_symbol_offset(symbol, &offset);
- if (ret) {
+ if (ret || offset < 0 || offset > UINT_MAX) {
pr_info("Failed to parse either an address or a symbol.\n");
return ret;
}
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