[PATCH 4.19 098/243] selftests/powerpc: Skip test instead of failing

From: Greg Kroah-Hartman
Date: Wed Dec 11 2019 - 10:20:09 EST

From: Breno Leitao <leitao@xxxxxxxxxx>

[ Upstream commit eafcd8e3fbad4f426a40ed2b6a8c697c3a4ef36a ]

Current core-pkey selftest fails if the test runs without privileges to
write into the core pattern file (/proc/sys/kernel/core_pattern). This
causes the test to fail and give the impression that the subsystem being
tested is broken, when, in fact, the test is being executed without the
proper privileges. This is the current error:

test: core_pkey
tags: git_version:v4.19-3-g9e3363be9bce-dirty
Error writing to core_pattern file: Permission denied
failure: core_pkey

This patch simply skips this test if it runs without the proper privileges,
avoiding this undesired failure.

CC: Tyrel Datwyler <tyreld@xxxxxxxxxxxxxxxxxx>
CC: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
Reviewed-by: Thiago Jung Bauermann <bauerman@xxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
tools/testing/selftests/powerpc/ptrace/core-pkey.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/tools/testing/selftests/powerpc/ptrace/core-pkey.c b/tools/testing/selftests/powerpc/ptrace/core-pkey.c
index e23e2e199eb4e..d5c64fee032dc 100644
--- a/tools/testing/selftests/powerpc/ptrace/core-pkey.c
+++ b/tools/testing/selftests/powerpc/ptrace/core-pkey.c
@@ -352,10 +352,7 @@ static int write_core_pattern(const char *core_pattern)
FILE *f;

f = fopen(core_pattern_file, "w");
- if (!f) {
- perror("Error writing to core_pattern file");
- return TEST_FAIL;
- }
+ SKIP_IF_MSG(!f, "Try with root privileges");

ret = fwrite(core_pattern, 1, len, f);