diff options
| author | Wang Nan <wangnan0@huawei.com> | 2016-05-24 09:21:27 +0000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-05-27 09:41:23 -0300 |
| commit | 38272dc4f1b17437871b786d567e1242d0904f5a (patch) | |
| tree | b4f32688639a3ad8fec9ff54ced5c3ca584a0945 /tools | |
| parent | 275ae411e56f8f900fa364da29c4706f9af4e1f3 (diff) | |
| download | linux-38272dc4f1b17437871b786d567e1242d0904f5a.tar.bz2 | |
perf symbols: Check kptr_restrict for root
If kptr_restrict is set to 2, even root is not allowed to see pointers.
This patch checks kptr_restrict even if euid == 0. For root, report
error if kptr_restrict is 2.
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1464081688-167940-1-git-send-email-wangnan0@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/util/symbol.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 20f9cb32b703..54c4ff2b1cee 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1933,17 +1933,17 @@ int setup_intlist(struct intlist **list, const char *list_str, static bool symbol__read_kptr_restrict(void) { bool value = false; + FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); - if (geteuid() != 0) { - FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r"); - if (fp != NULL) { - char line[8]; + if (fp != NULL) { + char line[8]; - if (fgets(line, sizeof(line), fp) != NULL) - value = atoi(line) != 0; + if (fgets(line, sizeof(line), fp) != NULL) + value = (geteuid() != 0) ? + (atoi(line) != 0) : + (atoi(line) == 2); - fclose(fp); - } + fclose(fp); } return value; |