linux-kernel - Re: [tip: x86/sgx] selftests/sgx: Improve error detection and messages

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Date:   Fri, 19 Mar 2021 15:58:07 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Jarkko Sakkinen <jarkko@...nel.org>, x86@...nel.org
Subject: Re: [tip: x86/sgx] selftests/sgx: Improve error detection and
 messages

On Fri, Mar 19, 2021 at 11:38:44AM -0000, tip-bot2 for Dave Hansen wrote:
>  tools/testing/selftests/sgx/load.c | 66 ++++++++++++++++++++++-------
>  tools/testing/selftests/sgx/main.c |  2 +-
>  2 files changed, 53 insertions(+), 15 deletions(-)

Anything against some more tweaks ontop?

---
diff --git a/tools/testing/selftests/sgx/load.c b/tools/testing/selftests/sgx/load.c
index 4c149f46d798..f441ac34b4d4 100644
--- a/tools/testing/selftests/sgx/load.c
+++ b/tools/testing/selftests/sgx/load.c
@@ -156,7 +156,7 @@ bool encl_load(const char *path, struct encl *encl)
 	 * the owner or in the owning group.
 	 */
 	if (!(sb.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))) {
-		fprintf(stderr, "no execute permissions on device file\n");
+		fprintf(stderr, "no execute permissions on device file %s\n", device_path);
 		goto err;
 	}
 
@@ -167,12 +167,15 @@ bool encl_load(const char *path, struct encl *encl)
 	}
 	munmap(ptr, PAGE_SIZE);
 
+#define ERR_MSG \
+"mmap() succeeded for PROT_READ, but failed for PROT_EXEC.\n" \
+" Check that current user has execute permissions on %s and \n" \
+" that /dev does not have noexec set: mount | grep \"/dev .*noexec\"\n" \
+" If so, remount it executable: mount -o remount,exec /dev\n\n"
+
 	ptr = mmap(NULL, PAGE_SIZE, PROT_EXEC, MAP_SHARED, fd, 0);
 	if (ptr == (void *)-1) {
-		perror("ERROR: mmap for exec");
-		fprintf(stderr, "mmap() succeeded for PROT_READ, but failed for PROT_EXEC\n");
-		fprintf(stderr, "check that user has execute permissions on %s and\n", device_path);
-		fprintf(stderr, "that /dev does not have noexec set: 'mount | grep \"/dev .*noexec\"'\n");
+		fprintf(stderr, ERR_MSG, device_path);
 		goto err;
 	}
 	munmap(ptr, PAGE_SIZE);


-- 
Regards/Gruss,
    Boris.

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