Commit 38272dc4 authored May 24, 2016 by Wang Nan Committed by Arnaldo Carvalho de Melo May 27, 2016

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>

parent 275ae411

tools/perf/util/symbol.c

+8 −8

Original line number	Diff line number	Diff line
		@@ -1933,18 +1933,18 @@ int setup_intlist(struct intlist *list, const char list_str,
		static bool symbol__read_kptr_restrict(void)
		{
		bool value = false;

		if (geteuid() != 0) {
		FILE *fp = fopen("/proc/sys/kernel/kptr_restrict", "r");

		if (fp != NULL) {
		char line[8];

		if (fgets(line, sizeof(line), fp) != NULL)
		value = atoi(line) != 0;
		value = (geteuid() != 0) ?
		(atoi(line) != 0) :
		(atoi(line) == 2);

		fclose(fp);
		}
		}

		return value;
		}