[PATCH] perf kvm: use strtol for walking guestmount directory

From: David Ahern
Date: Sun Jul 29 2012 - 22:54:34 EST


Only want to process directories under the guestmnount directory that have a
pid as a name (ie, all digits). Other entries in the guestmount directory
should be ignored. There is already a check that requires the first character
of each entry to be a digit, but atoi is used to convert the directory name to
a pid. For example if guestmount contains a directory with the name 1foo, atoi
converts it to a pid of 1 and a machine is created with a pid of 1. This is
wrong; this directory really should be ignored. Use strtol to do that.

Signed-off-by: David Ahern <dsahern@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
---
tools/perf/util/symbol.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index fdad4eee..15bc673 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -2875,6 +2875,7 @@ int machines__create_guest_kernel_maps(struct rb_root *machines)
int i, items = 0;
char path[PATH_MAX];
pid_t pid;
+ char *endp;

if (symbol_conf.default_guest_vmlinux_name ||
symbol_conf.default_guest_modules ||
@@ -2891,7 +2892,14 @@ int machines__create_guest_kernel_maps(struct rb_root *machines)
/* Filter out . and .. */
continue;
}
- pid = atoi(namelist[i]->d_name);
+ pid = (pid_t) strtol(namelist[i]->d_name, &endp, 10);
+ if ((*endp != '\0') ||
+ (endp == namelist[i]->d_name) ||
+ (errno == ERANGE)) {
+ pr_debug("invalid directory (%s). Skipping.\n",
+ namelist[i]->d_name);
+ continue;
+ }
sprintf(path, "%s/%s/proc/kallsyms",
symbol_conf.guestmount,
namelist[i]->d_name);
--
1.7.10.1

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