[LTP] [PATCH] Added new_behavior flag to detect kernel version Kernel >= 6.11: Tests that creat() succeeds (write to executed file allowed)

[LTP] [PATCH] Added new_behavior flag to detect kernel version Kernel >= 6.11: Tests that creat() succeeds (write to executed file allowed)

[lepillai]

From: lekshmi-cpillai <lekshmi@ktes.isst.tadn.ibm.com>

Signed-off-by: lekshmi-cpillai <lepillai@linux.ibm.com>
---
 testcases/kernel/syscalls/creat/creat07.c | 38 ++++++++++++++++-------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/testcases/kernel/syscalls/creat/creat07.c b/testcases/kernel/syscalls/creat/creat07.c
index c7b85ee69..762022301 100644
--- a/testcases/kernel/syscalls/creat/creat07.c
+++ b/testcases/kernel/syscalls/creat/creat07.c
@@ -19,6 +19,8 @@
 
 #define TEST_APP "creat07_child"
 
+static int new_behavior;
+
 static void verify_creat(void)
 {
 	pid_t pid;
@@ -33,16 +35,26 @@ static void verify_creat(void)
 
 	TEST(creat(TEST_APP, O_WRONLY));
 
-	if (TST_RET != -1) {
-		tst_res(TFAIL, "creat() succeeded unexpectedly");
-		return;
+	if (new_behavior) {
+		/* Kernel >= 6.11: write to executed file is allowed */
+		if (TST_RET != -1) {
+			SAFE_CLOSE(TST_RET);
+			tst_res(TPASS, "creat() succeeded as expected (new behavior)");
+		} else {
+			tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
+		}
+	} else {
+		/* Kernel < 6.11: write to executed file returns ETXTBSY */
+		if (TST_RET != -1) {
+			tst_res(TFAIL, "creat() succeeded unexpectedly");
+			SAFE_CLOSE(TST_RET);
+		} else if (TST_ERR == ETXTBSY) {
+			tst_res(TPASS, "creat() received ETXTBSY");
+		} else {
+			tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
+		}
 	}
 
-	if (TST_ERR == ETXTBSY)
-		tst_res(TPASS, "creat() received EXTBSY");
-	else
-		tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
-
 	SAFE_KILL(pid, SIGKILL);
 	SAFE_WAITPID(pid, NULL, 0);
 }
@@ -50,9 +62,13 @@ static void verify_creat(void)
 static void setup(void)
 {
 	if ((tst_kvercmp(6, 11, 0)) >= 0) {
-		tst_brk(TCONF, "Skipping test, write to executed file is "
-			"allowed since 6.11-rc1.\n"
-			"2a010c412853 (\"fs: don't block i_writecount during exec\")");
+		new_behavior = 1;
+		tst_res(TINFO, "Testing new behavior: write to executed file is "
+			"allowed since 6.11-rc1 (2a010c412853)");
+	} else {
+		new_behavior = 0;
+		tst_res(TINFO, "Testing old behavior: write to executed file "
+			"returns ETXTBSY");
 	}
 }
 
-- 
2.39.1


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Re: [LTP] [PATCH] Added new_behavior flag to detect kernel version Kernel >= 6.11: Tests that creat() succeeds (write to executed file allowed)

[Cyril Hrubis]

Hi!
> +static int new_behavior;
> +
>  static void verify_creat(void)
>  {
>  	pid_t pid;
> @@ -33,16 +35,26 @@ static void verify_creat(void)
>  
>  	TEST(creat(TEST_APP, O_WRONLY));
>  
> -	if (TST_RET != -1) {
> -		tst_res(TFAIL, "creat() succeeded unexpectedly");
> -		return;
> +	if (new_behavior) {
> +		/* Kernel >= 6.11: write to executed file is allowed */
> +		if (TST_RET != -1) {
> +			SAFE_CLOSE(TST_RET);
> +			tst_res(TPASS, "creat() succeeded as expected (new behavior)");
> +		} else {
> +			tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
> +		}
> +	} else {
> +		/* Kernel < 6.11: write to executed file returns ETXTBSY */
> +		if (TST_RET != -1) {
> +			tst_res(TFAIL, "creat() succeeded unexpectedly");
> +			SAFE_CLOSE(TST_RET);
> +		} else if (TST_ERR == ETXTBSY) {
> +			tst_res(TPASS, "creat() received ETXTBSY");
> +		} else {
> +			tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
> +		}
>  	}
>  
> -	if (TST_ERR == ETXTBSY)
> -		tst_res(TPASS, "creat() received EXTBSY");
> -	else
> -		tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
> -
>  	SAFE_KILL(pid, SIGKILL);
>  	SAFE_WAITPID(pid, NULL, 0);
>  }
> @@ -50,9 +62,13 @@ static void verify_creat(void)
>  static void setup(void)
>  {
>  	if ((tst_kvercmp(6, 11, 0)) >= 0) {
> -		tst_brk(TCONF, "Skipping test, write to executed file is "
> -			"allowed since 6.11-rc1.\n"
> -			"2a010c412853 (\"fs: don't block i_writecount during exec\")");
> +		new_behavior = 1;
> +		tst_res(TINFO, "Testing new behavior: write to executed file is "
> +			"allowed since 6.11-rc1 (2a010c412853)");
> +	} else {
> +		new_behavior = 0;
> +		tst_res(TINFO, "Testing old behavior: write to executed file "
> +			"returns ETXTBSY");

Apart from the code being ugly and having way too much verbose messages
the test is likely broken with -i 2 command line option on newer
kernels.

-- 
Cyril Hrubis
chrubis@suse.cz

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[LTP] [PATCH] Added new_behavior flag to detect kernel version Kernel >= 6.11: Tests that creat() succeeds (write to executed file allowed)

[lepillai]

From: lekshmi-cpillai <lekshmi@ktes.isst.tadn.ibm.com>

---
 testcases/kernel/syscalls/creat/creat07.c | 38 ++++++++++++++++-------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/testcases/kernel/syscalls/creat/creat07.c b/testcases/kernel/syscalls/creat/creat07.c
index c7b85ee69..762022301 100644
--- a/testcases/kernel/syscalls/creat/creat07.c
+++ b/testcases/kernel/syscalls/creat/creat07.c
@@ -19,6 +19,8 @@
 
 #define TEST_APP "creat07_child"
 
+static int new_behavior;
+
 static void verify_creat(void)
 {
 	pid_t pid;
@@ -33,16 +35,26 @@ static void verify_creat(void)
 
 	TEST(creat(TEST_APP, O_WRONLY));
 
-	if (TST_RET != -1) {
-		tst_res(TFAIL, "creat() succeeded unexpectedly");
-		return;
+	if (new_behavior) {
+		/* Kernel >= 6.11: write to executed file is allowed */
+		if (TST_RET != -1) {
+			SAFE_CLOSE(TST_RET);
+			tst_res(TPASS, "creat() succeeded as expected (new behavior)");
+		} else {
+			tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
+		}
+	} else {
+		/* Kernel < 6.11: write to executed file returns ETXTBSY */
+		if (TST_RET != -1) {
+			tst_res(TFAIL, "creat() succeeded unexpectedly");
+			SAFE_CLOSE(TST_RET);
+		} else if (TST_ERR == ETXTBSY) {
+			tst_res(TPASS, "creat() received ETXTBSY");
+		} else {
+			tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
+		}
 	}
 
-	if (TST_ERR == ETXTBSY)
-		tst_res(TPASS, "creat() received EXTBSY");
-	else
-		tst_res(TFAIL | TTERRNO, "creat() failed unexpectedly");
-
 	SAFE_KILL(pid, SIGKILL);
 	SAFE_WAITPID(pid, NULL, 0);
 }
@@ -50,9 +62,13 @@ static void verify_creat(void)
 static void setup(void)
 {
 	if ((tst_kvercmp(6, 11, 0)) >= 0) {
-		tst_brk(TCONF, "Skipping test, write to executed file is "
-			"allowed since 6.11-rc1.\n"
-			"2a010c412853 (\"fs: don't block i_writecount during exec\")");
+		new_behavior = 1;
+		tst_res(TINFO, "Testing new behavior: write to executed file is "
+			"allowed since 6.11-rc1 (2a010c412853)");
+	} else {
+		new_behavior = 0;
+		tst_res(TINFO, "Testing old behavior: write to executed file "
+			"returns ETXTBSY");
 	}
 }
 
-- 
2.39.1


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Mailing list info: https://lists.linux.it/listinfo/ltp

Re: [LTP] Added new_behavior flag to detect kernel version Kernel >= 6.11: Tests that creat() succeeds (write to executed file allowed)

[linuxtestproject.agent]

Hi Lekshmi,

On 2026-04-21, lekshmi-cpillai wrote:
> Added new_behavior flag to detect kernel version Kernel >= 6.11: Tests that creat() succeeds (write to executed file allowed)

Use imperative mood in the subject: "creat07: Support both old and new
write-to-executed-file behavior". Also add a commit body explaining why
the change is needed — that the previous tst_brk(TCONF) silently skipped
the test on all kernels >= 6.11 instead of verifying the allowed behavior.
Finally, the Signed-off-by tag is missing.

> +static int new_behavior;

[...]

> -               tst_brk(TCONF, "Skipping test, write to executed file is "
> -                       "allowed since 6.11-rc1.\n"
> -                       "2a010c412853 (\"fs: don't block i_writecount during exec\")");
> +               new_behavior = 1;

The logic change is correct. However the doc comment at the top of the
file still only mentions ETXTBSY — update it to describe both behaviors.

[...]

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- creat07.c:35 — O_WRONLY (value 1) is passed as the mode argument to
  creat(); the second parameter is mode_t, not open flags — likely
  intended to be 0600.

---
Note:

Our agent completed the review of the patch. The full review can be
found at: https://github.com/linux-test-project/ltp-agent/actions/runs/24705759346

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