linux-kernel - [PATCH] selftests/x86/lam: Zero out buffer for readlink()

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Date:   Sun, 24 Sep 2023 07:33:46 +0800
From:   Binbin Wu <binbin.wu@...ux.intel.com>
To:     dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        shuah@...nel.org
Cc:     linux-kselftest@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, weihong.zhang@...el.com,
        kirill.shutemov@...ux.intel.com, binbin.wu@...ux.intel.com
Subject: [PATCH] selftests/x86/lam: Zero out buffer for readlink()

Zero out the buffer for readlink() since readlink() does not append a
terminating null byte to the buffer.

Fixes: 833c12ce0f430 ("selftests/x86/lam: Add inherit test cases for linear-address masking")

Signed-off-by: Binbin Wu <binbin.wu@...ux.intel.com>
---
 tools/testing/selftests/x86/lam.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/x86/lam.c b/tools/testing/selftests/x86/lam.c
index eb0e46905bf9..9f06942a8e25 100644
--- a/tools/testing/selftests/x86/lam.c
+++ b/tools/testing/selftests/x86/lam.c
@@ -680,7 +680,7 @@ static int handle_execve(struct testcases *test)
 		perror("Fork failed.");
 		ret = 1;
 	} else if (pid == 0) {
-		char path[PATH_MAX];
+		char path[PATH_MAX] = {0};
 
 		/* Set LAM mode in parent process */
 		if (set_lam(lam) != 0)

base-commit: ce9ecca0238b140b88f43859b211c9fdfd8e5b70
-- 
2.25.1