G'Day,
# perf record -F 99 -a -g -- sleep 30
[...]
# perf report -n --stdio
File /tmp/perf-25958.map not owned by current user or root, ignoring it.
Can root bypass this test? I'm root, and profiling apps from different
user-IDs, and the current workaround is to "chown root
/tmp/perf*.map". Shouldn't root be able to read these map files? Could
we:
--- linux-perf/tools/perf/util/symbol.c 2015-11-03 20:08:40.829320940 +0000
+++ linux-perf-edited/tools/perf/util/symbol.c 2015-11-12
18:21:35.487077872 +0000
@@ -1433,14 +1433,17 @@
dso->adjust_symbols = 0;
if (strncmp(dso->name, "/tmp/perf-", 10) == 0) {
+ uint_t euid;
struct stat st;
if (lstat(dso->name, &st) < 0)
goto out;
- if (st.st_uid && (st.st_uid != geteuid())) {
- pr_warning("File %s not owned by current user or root, "
- "ignoring it.\n", dso->name);
+ euid = geteuid();
+ if (euid && st.st_uid && (st.st_uid != euid)) {
+ pr_warning("File %s not owned by current user, and "
+ "current user is not root. Ignoring it.\n",
+ dso->name);
goto out;
}
Brendan
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