[LTP] [PATCH] syscalls/execveat03: Fix compiler errors

[LTP] [PATCH] syscalls/execveat03: Fix compiler errors

[Xiao Yang]

According to open(2) and linkat(2) manpages, O_PATH and AT_EMPTY_PATH
flags were added since kernel v2.6.39, so these undefined flags led
to the following errors on older kernels(e.g. v2.6.32):
---------------------------------------------------------
execveat03.c:66: error: ‘O_PATH’ undeclared (first use in this function)
execveat03.c:69: error: ‘AT_EMPTY_PATH’ undeclared (first use in this function)
---------------------------------------------------------

1) Add AT_EMPTY_PATH into lapi/fcntl.h
2) Include lapi/fcntl.h in execveat03.c
3) Check if open(2) supports O_PATH

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
 include/lapi/fcntl.h                            |  4 ++++
 testcases/kernel/syscalls/execveat/execveat03.c | 10 +++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/lapi/fcntl.h b/include/lapi/fcntl.h
index 849439d..358230f 100644
--- a/include/lapi/fcntl.h
+++ b/include/lapi/fcntl.h
@@ -103,6 +103,10 @@
 # define AT_SYMLINK_NOFOLLOW 0x100
 #endif
 
+#ifndef AT_EMPTY_PATH
+# define AT_EMPTY_PATH 0x1000
+#endif
+
 #ifndef AT_REMOVEDIR
 # define AT_REMOVEDIR 0x200
 #endif
diff --git a/testcases/kernel/syscalls/execveat/execveat03.c b/testcases/kernel/syscalls/execveat/execveat03.c
index df27273..701784e 100644
--- a/testcases/kernel/syscalls/execveat/execveat03.c
+++ b/testcases/kernel/syscalls/execveat/execveat03.c
@@ -49,6 +49,7 @@
 #include <fcntl.h>
 #include "tst_test.h"
 #include "lapi/execveat.h"
+#include "lapi/fcntl.h"
 
 #define OVL_MNT "ovl"
 #define TEST_APP "execveat_child"
@@ -63,7 +64,14 @@ static void do_child(void)
 
 	SAFE_CP(TEST_APP, TEST_FILE_PATH);
 
-	fd = SAFE_OPEN(TEST_FILE_PATH, O_PATH);
+	fd = open(TEST_FILE_PATH, O_PATH);
+	if (fd == -1) {
+		if (errno == EINVAL)
+			tst_brk(TCONF, "open() did not support O_PATH");
+		else
+			tst_brk(TBROK, "open() failed");
+	}
+
 	SAFE_UNLINK(TEST_FILE_PATH);
 
 	TEST(execveat(fd, "", argv, environ, AT_EMPTY_PATH));
-- 
1.8.3.1

[LTP] [PATCH] syscalls/execveat03: Fix compiler errors

[Jan Stancek]

----- Original Message -----
> According to open(2) and linkat(2) manpages, O_PATH and AT_EMPTY_PATH
> flags were added since kernel v2.6.39, so these undefined flags led
> to the following errors on older kernels(e.g. v2.6.32):
> ---------------------------------------------------------
> execveat03.c:66: error: ‘O_PATH’ undeclared (first use in this function)
> execveat03.c:69: error: ‘AT_EMPTY_PATH’ undeclared (first use in this
> function)
> ---------------------------------------------------------
> 
> 1) Add AT_EMPTY_PATH into lapi/fcntl.h
> 2) Include lapi/fcntl.h in execveat03.c

Agreed with 1 and 2.

> 3) Check if open(2) supports O_PATH

Do we need to worry about this one? execveat() has been introduced [1]
around v3.19. Those kernels should already support O_PATH.

[1] 51f39a1f0cea ("syscalls: implement execveat() system call")

> 
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>  include/lapi/fcntl.h                            |  4 ++++
>  testcases/kernel/syscalls/execveat/execveat03.c | 10 +++++++++-
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/include/lapi/fcntl.h b/include/lapi/fcntl.h
> index 849439d..358230f 100644
> --- a/include/lapi/fcntl.h
> +++ b/include/lapi/fcntl.h
> @@ -103,6 +103,10 @@
>  # define AT_SYMLINK_NOFOLLOW 0x100
>  #endif
>  
> +#ifndef AT_EMPTY_PATH
> +# define AT_EMPTY_PATH 0x1000
> +#endif
> +
>  #ifndef AT_REMOVEDIR
>  # define AT_REMOVEDIR 0x200
>  #endif
> diff --git a/testcases/kernel/syscalls/execveat/execveat03.c
> b/testcases/kernel/syscalls/execveat/execveat03.c
> index df27273..701784e 100644
> --- a/testcases/kernel/syscalls/execveat/execveat03.c
> +++ b/testcases/kernel/syscalls/execveat/execveat03.c
> @@ -49,6 +49,7 @@
>  #include <fcntl.h>
>  #include "tst_test.h"
>  #include "lapi/execveat.h"
> +#include "lapi/fcntl.h"
>  
>  #define OVL_MNT "ovl"
>  #define TEST_APP "execveat_child"
> @@ -63,7 +64,14 @@ static void do_child(void)
>  
>  	SAFE_CP(TEST_APP, TEST_FILE_PATH);
>  
> -	fd = SAFE_OPEN(TEST_FILE_PATH, O_PATH);
> +	fd = open(TEST_FILE_PATH, O_PATH);
> +	if (fd == -1) {
> +		if (errno == EINVAL)
> +			tst_brk(TCONF, "open() did not support O_PATH");
> +		else
> +			tst_brk(TBROK, "open() failed");
> +	}
> +
>  	SAFE_UNLINK(TEST_FILE_PATH);
>  
>  	TEST(execveat(fd, "", argv, environ, AT_EMPTY_PATH));
> --
> 1.8.3.1
> 
> 
> 
> 
> --
> Mailing list info: https://lists.linux.it/listinfo/ltp
> 

[LTP] [PATCH] syscalls/execveat03: Fix compiler errors

[Xiao Yang]

On 2018/08/21 20:02, Jan Stancek wrote:
>
> ----- Original Message -----
>> According to open(2) and linkat(2) manpages, O_PATH and AT_EMPTY_PATH
>> flags were added since kernel v2.6.39, so these undefined flags led
>> to the following errors on older kernels(e.g. v2.6.32):
>> ---------------------------------------------------------
>> execveat03.c:66: error: ‘O_PATH’ undeclared (first use in this function)
>> execveat03.c:69: error: ‘AT_EMPTY_PATH’ undeclared (first use in this
>> function)
>> ---------------------------------------------------------
>>
>> 1) Add AT_EMPTY_PATH into lapi/fcntl.h
>> 2) Include lapi/fcntl.h in execveat03.c
> Agreed with 1 and 2.
>
>> 3) Check if open(2) supports O_PATH
> Do we need to worry about this one? execveat() has been introduced [1]
> around v3.19. Those kernels should already support O_PATH.
>
> [1] 51f39a1f0cea ("syscalls: implement execveat() system call")
Hi Jan,

Thanks for your review.
It is reasonable to drop this check as you explained.

Thanks,
Xiao Yang
>> Signed-off-by: Xiao Yang<yangx.jy@cn.fujitsu.com>
>> ---
>>   include/lapi/fcntl.h                            |  4 ++++
>>   testcases/kernel/syscalls/execveat/execveat03.c | 10 +++++++++-
>>   2 files changed, 13 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/lapi/fcntl.h b/include/lapi/fcntl.h
>> index 849439d..358230f 100644
>> --- a/include/lapi/fcntl.h
>> +++ b/include/lapi/fcntl.h
>> @@ -103,6 +103,10 @@
>>   # define AT_SYMLINK_NOFOLLOW 0x100
>>   #endif
>>
>> +#ifndef AT_EMPTY_PATH
>> +# define AT_EMPTY_PATH 0x1000
>> +#endif
>> +
>>   #ifndef AT_REMOVEDIR
>>   # define AT_REMOVEDIR 0x200
>>   #endif
>> diff --git a/testcases/kernel/syscalls/execveat/execveat03.c
>> b/testcases/kernel/syscalls/execveat/execveat03.c
>> index df27273..701784e 100644
>> --- a/testcases/kernel/syscalls/execveat/execveat03.c
>> +++ b/testcases/kernel/syscalls/execveat/execveat03.c
>> @@ -49,6 +49,7 @@
>>   #include<fcntl.h>
>>   #include "tst_test.h"
>>   #include "lapi/execveat.h"
>> +#include "lapi/fcntl.h"
>>
>>   #define OVL_MNT "ovl"
>>   #define TEST_APP "execveat_child"
>> @@ -63,7 +64,14 @@ static void do_child(void)
>>
>>   	SAFE_CP(TEST_APP, TEST_FILE_PATH);
>>
>> -	fd = SAFE_OPEN(TEST_FILE_PATH, O_PATH);
>> +	fd = open(TEST_FILE_PATH, O_PATH);
>> +	if (fd == -1) {
>> +		if (errno == EINVAL)
>> +			tst_brk(TCONF, "open() did not support O_PATH");
>> +		else
>> +			tst_brk(TBROK, "open() failed");
>> +	}
>> +
>>   	SAFE_UNLINK(TEST_FILE_PATH);
>>
>>   	TEST(execveat(fd, "", argv, environ, AT_EMPTY_PATH));
>> --
>> 1.8.3.1
>>
>>
>>
>>
>> --
>> Mailing list info: https://lists.linux.it/listinfo/ltp
>>
>
> .
>

[LTP] [PATCH v2] syscalls/execveat03: Fix compiler errors

[Xiao Yang]

According to open(2) and linkat(2) manpages, O_PATH and AT_EMPTY_PATH
flags were added since kernel v2.6.39, so these undefined flags led
to the following errors on older kernels(e.g. v2.6.32):
---------------------------------------------------------
execveat03.c:66: error: ‘O_PATH’ undeclared (first use in this function)
execveat03.c:69: error: ‘AT_EMPTY_PATH’ undeclared (first use in this function)
---------------------------------------------------------

1) Add AT_EMPTY_PATH into lapi/fcntl.h
2) Include lapi/fcntl.h in execveat03.c

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
 include/lapi/fcntl.h                            | 4 ++++
 testcases/kernel/syscalls/execveat/execveat03.c | 1 +
 2 files changed, 5 insertions(+)

diff --git a/include/lapi/fcntl.h b/include/lapi/fcntl.h
index 849439d..358230f 100644
--- a/include/lapi/fcntl.h
+++ b/include/lapi/fcntl.h
@@ -103,6 +103,10 @@
 # define AT_SYMLINK_NOFOLLOW 0x100
 #endif
 
+#ifndef AT_EMPTY_PATH
+# define AT_EMPTY_PATH 0x1000
+#endif
+
 #ifndef AT_REMOVEDIR
 # define AT_REMOVEDIR 0x200
 #endif
diff --git a/testcases/kernel/syscalls/execveat/execveat03.c b/testcases/kernel/syscalls/execveat/execveat03.c
index df27273..315620b 100644
--- a/testcases/kernel/syscalls/execveat/execveat03.c
+++ b/testcases/kernel/syscalls/execveat/execveat03.c
@@ -49,6 +49,7 @@
 #include <fcntl.h>
 #include "tst_test.h"
 #include "lapi/execveat.h"
+#include "lapi/fcntl.h"
 
 #define OVL_MNT "ovl"
 #define TEST_APP "execveat_child"
-- 
1.8.3.1

[LTP] [PATCH v2] syscalls/execveat03: Fix compiler errors

[Jan Stancek]

----- Original Message -----
> According to open(2) and linkat(2) manpages, O_PATH and AT_EMPTY_PATH
> flags were added since kernel v2.6.39, so these undefined flags led
> to the following errors on older kernels(e.g. v2.6.32):
> ---------------------------------------------------------
> execveat03.c:66: error: ‘O_PATH’ undeclared (first use in this function)
> execveat03.c:69: error: ‘AT_EMPTY_PATH’ undeclared (first use in this
> function)
> ---------------------------------------------------------
> 
> 1) Add AT_EMPTY_PATH into lapi/fcntl.h
> 2) Include lapi/fcntl.h in execveat03.c
> 
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>

Pushed.

We could add also minimum kernel version check, but since test
is using ltp_syscall(), it handles ENOSYS. I'll leave it as it
is for now.

Thanks,
Jan