[LTP] [PATCH v3 0/3] Add test support for the new fanotify FAN_REPORT_PIDFD feature

[LTP] [PATCH v3 0/3] Add test support for the new fanotify FAN_REPORT_PIDFD feature

[Matthew Bobrowski via ltp]

This is a follow up series of the previous series [0] that I had
posted through which factors in Amir's recommendation around the
splitting of the new macro helper into a separate patch.

Apart from that, there's no difference.

[0] https://lore.kernel.org/ltp/cover.1635849607.git.repnop@google.com/

Matthew Bobrowski (3):
  syscalls/fanotify: Add a helper macro which checks for the presence of
    specific fanotify initialization flag(s)
  syscalls/fanotify20: add new test for FAN_REPORT_PIDFD
  syscalls/fanotify21: test returned pidfd from fanotify in
    FAN_REPORT_PIDFD mode

 testcases/kernel/syscalls/fanotify/.gitignore |   2 +
 testcases/kernel/syscalls/fanotify/fanotify.h |  26 ++
 .../kernel/syscalls/fanotify/fanotify20.c     | 128 ++++++++
 .../kernel/syscalls/fanotify/fanotify21.c     | 306 ++++++++++++++++++
 4 files changed, 462 insertions(+)
 create mode 100644 testcases/kernel/syscalls/fanotify/fanotify20.c
 create mode 100644 testcases/kernel/syscalls/fanotify/fanotify21.c

-- 
2.34.0.rc0.344.g81b53c2807-goog

/M

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

[LTP] [PATCH v3 1/3] syscalls/fanotify: Add a helper macro which checks for the presence of specific fanotify initialization flag(s)

[Matthew Bobrowski via ltp]

This is a trivial macro that can be used throughout fanotify tests to
check whether the underlying running kernel supports the supplied
fanotify initialization flag(s).

Signed-off-by: Matthew Bobrowski <repnop@google.com>
---
 testcases/kernel/syscalls/fanotify/fanotify.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/testcases/kernel/syscalls/fanotify/fanotify.h b/testcases/kernel/syscalls/fanotify/fanotify.h
index a2be18338..e2db3c6f5 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify.h
+++ b/testcases/kernel/syscalls/fanotify/fanotify.h
@@ -352,6 +352,11 @@ static inline void fanotify_init_flags_err_msg(const char *flags_str,
 		fanotify_init_flags_supported_on_fs(flags, fname)); \
 	} while (0)
 
+#define REQUIRE_FANOTIFY_INIT_FLAGS_SUPPORTED_BY_KERNEL(flags) do { \
+	fanotify_init_flags_err_msg(#flags, __FILE__, __LINE__, tst_brk_, \
+		fanotify_init_flags_supported_by_kernel(flags)); \
+	} while (0)
+
 static inline int fanotify_mark_supported_by_kernel(uint64_t flag)
 {
 	int fd;
-- 
2.34.0.rc0.344.g81b53c2807-goog

/M

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

Re: [LTP] [PATCH v3 1/3] syscalls/fanotify: Add a helper macro which checks for the presence of specific fanotify initialization flag(s)

[Amir Goldstein]

On Tue, Nov 9, 2021 at 12:05 PM Matthew Bobrowski <repnop@google.com> wrote:
>
> This is a trivial macro that can be used throughout fanotify tests to
> check whether the underlying running kernel supports the supplied
> fanotify initialization flag(s).
>
> Signed-off-by: Matthew Bobrowski <repnop@google.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>

> ---
>  testcases/kernel/syscalls/fanotify/fanotify.h | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/testcases/kernel/syscalls/fanotify/fanotify.h b/testcases/kernel/syscalls/fanotify/fanotify.h
> index a2be18338..e2db3c6f5 100644
> --- a/testcases/kernel/syscalls/fanotify/fanotify.h
> +++ b/testcases/kernel/syscalls/fanotify/fanotify.h
> @@ -352,6 +352,11 @@ static inline void fanotify_init_flags_err_msg(const char *flags_str,
>                 fanotify_init_flags_supported_on_fs(flags, fname)); \
>         } while (0)
>
> +#define REQUIRE_FANOTIFY_INIT_FLAGS_SUPPORTED_BY_KERNEL(flags) do { \
> +       fanotify_init_flags_err_msg(#flags, __FILE__, __LINE__, tst_brk_, \
> +               fanotify_init_flags_supported_by_kernel(flags)); \
> +       } while (0)
> +
>  static inline int fanotify_mark_supported_by_kernel(uint64_t flag)
>  {
>         int fd;
> --
> 2.34.0.rc0.344.g81b53c2807-goog
>
> /M

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

Re: [LTP] [PATCH v3 1/3] syscalls/fanotify: Add a helper macro which checks for the presence of specific fanotify initialization flag(s)

[Petr Vorel]

Hi Matthew, Amir,

Tested on two distro kernels with support (Tumbleweed and Debian unstable)
+ on various old kernels without support.

Merged with very minor fixes, see diff below.

NOTE: we now support basic static analysis + checkpatch formatting check - run
make check in fanotify directory or make check-fanotify20.

Thanks a lot!

Kind regards,
Petr

diff --git runtest/syscalls runtest/syscalls
index 1e6d46744..d57c73e39 100644
--- runtest/syscalls
+++ runtest/syscalls
@@ -605,6 +605,8 @@ fanotify16 fanotify16
 fanotify17 fanotify17
 fanotify18 fanotify18
 fanotify19 fanotify19
+fanotify20 fanotify20
+fanotify21 fanotify21
 
 ioperm01 ioperm01
 ioperm02 ioperm02
diff --git testcases/kernel/syscalls/fanotify/fanotify20.c testcases/kernel/syscalls/fanotify/fanotify20.c
index 9960d85eb..de0fdb782 100644
--- testcases/kernel/syscalls/fanotify/fanotify20.c
+++ testcases/kernel/syscalls/fanotify/fanotify20.c
@@ -12,6 +12,9 @@
  * returns an expected error code when provided an invalid initialization flag
  * alongside FAN_REPORT_PIDFD. Additionally, it checks that the operability with
  * existing FAN_REPORT_* flags is maintained and functioning as intended.
+ *
+ * NOTE: FAN_REPORT_PIDFD support was added in v5.15-rc1 in af579beb666a
+ * ("fanotify: add pidfd support to the fanotify API").
  */
 
 #define _GNU_SOURCE
@@ -39,7 +42,7 @@ static struct test_case_t {
 	},
 	{
 		"pass on FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME",
-		FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME ,
+		FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME,
 		0,
 		0,
 	},
diff --git testcases/kernel/syscalls/fanotify/fanotify21.c testcases/kernel/syscalls/fanotify/fanotify21.c
index e842dad17..6ae70c57e 100644
--- testcases/kernel/syscalls/fanotify/fanotify21.c
+++ testcases/kernel/syscalls/fanotify/fanotify21.c
@@ -11,6 +11,9 @@
  * A test which verifies whether the returned struct
  * fanotify_event_info_pidfd in FAN_REPORT_PIDFD mode contains the
  * expected set of information.
+ *
+ * NOTE: FAN_REPORT_PIDFD support was added in v5.15-rc1 in af579beb666a
+ * ("fanotify: add pidfd support to the fanotify API").
  */
 
 #define _GNU_SOURCE
@@ -56,7 +59,7 @@ struct test_case_t {
 
 static int fanotify_fd;
 static char event_buf[BUF_SZ];
-static struct pidfd_fdinfo_t *self_pidfd_fdinfo = NULL;
+static struct pidfd_fdinfo_t *self_pidfd_fdinfo;
 
 static struct pidfd_fdinfo_t *read_pidfd_fdinfo(int pidfd)
 {
@@ -158,7 +161,7 @@ static void do_test(unsigned int num)
 	 * buffer.
 	 */
 	len = SAFE_READ(0, fanotify_fd, event_buf, sizeof(event_buf));
-	while(i < len) {
+	while (i < len) {
 		struct fanotify_event_metadata *event;
 		struct fanotify_event_info_pidfd *info;
 		struct pidfd_fdinfo_t *event_pidfd_fdinfo = NULL;
@@ -197,7 +200,7 @@ static void do_test(unsigned int num)
 			tst_res(TFAIL,
 				"pidfd creation failed for pid: %u with pidfd error value "
 				"set to: %d",
-				(unsigned)event->pid,
+				(unsigned int)event->pid,
 				info->pidfd);
 			goto next_event;
 		} else if (tc->want_pidfd_err &&
@@ -205,14 +208,14 @@ static void do_test(unsigned int num)
 			tst_res(TFAIL,
 				"pidfd set to an unexpected error: %d for pid: %u",
 				info->pidfd,
-				(unsigned)event->pid);
+				(unsigned int)event->pid);
 			goto next_event;
 		} else if (tc->want_pidfd_err &&
 			   info->pidfd == tc->want_pidfd_err) {
 			tst_res(TPASS,
 				"pid: %u terminated before pidfd was created, "
 				"pidfd set to the value of: %d, as expected",
-				(unsigned)event->pid,
+				(unsigned int)event->pid,
 				FAN_NOPIDFD);
 			goto next_event;
 		}
@@ -227,15 +230,15 @@ static void do_test(unsigned int num)
 				"reading fdinfo for pidfd: %d "
 				"describing pid: %u failed",
 				info->pidfd,
-				(unsigned)event->pid);
+				(unsigned int)event->pid);
 			goto next_event;
 		} else if (event_pidfd_fdinfo->pid != event->pid) {
 			tst_res(TFAIL,
 				"pidfd provided for incorrect pid "
 				"(expected pidfd for pid: %u, got pidfd for "
 				"pid: %u)",
-				(unsigned)event->pid,
-				(unsigned)event_pidfd_fdinfo->pid);
+				(unsigned int)event->pid,
+				(unsigned int)event_pidfd_fdinfo->pid);
 			goto next_event;
 		} else if (memcmp(event_pidfd_fdinfo, self_pidfd_fdinfo,
 				  sizeof(struct pidfd_fdinfo_t))) {
@@ -261,7 +264,7 @@ static void do_test(unsigned int num)
 				"mask: %lld, pid: %u, fd: %d, "
 				"pidfd: %d, info_type: %d, info_len: %d",
 				(unsigned long long)event->mask,
-				(unsigned)event->pid,
+				(unsigned int)event->pid,
 				event->fd,
 				info->pidfd,
 				info->hdr.info_type,

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

Re: [LTP] [PATCH v3 1/3] syscalls/fanotify: Add a helper macro which checks for the presence of specific fanotify initialization flag(s)

[Matthew Bobrowski via ltp]

On Mon, Nov 15, 2021 at 10:20:18PM +0100, Petr Vorel wrote:
> Hi Matthew, Amir,
> 
> Tested on two distro kernels with support (Tumbleweed and Debian unstable)
> + on various old kernels without support.
> 
> Merged with very minor fixes, see diff below.

Noted the changes, they're fine by me. Thanks for the merge!

> NOTE: we now support basic static analysis + checkpatch formatting check - run
> make check in fanotify directory or make check-fanotify20.

Oh, that's great, I had no idea. Quickly running it, looks like
there's a bunch of clean up required for some of the older tests. Will
have to get around to doing that at some point.

> diff --git runtest/syscalls runtest/syscalls
> index 1e6d46744..d57c73e39 100644
> --- runtest/syscalls
> +++ runtest/syscalls
> @@ -605,6 +605,8 @@ fanotify16 fanotify16
>  fanotify17 fanotify17
>  fanotify18 fanotify18
>  fanotify19 fanotify19
> +fanotify20 fanotify20
> +fanotify21 fanotify21
>  
>  ioperm01 ioperm01
>  ioperm02 ioperm02
> diff --git testcases/kernel/syscalls/fanotify/fanotify20.c testcases/kernel/syscalls/fanotify/fanotify20.c
> index 9960d85eb..de0fdb782 100644
> --- testcases/kernel/syscalls/fanotify/fanotify20.c
> +++ testcases/kernel/syscalls/fanotify/fanotify20.c
> @@ -12,6 +12,9 @@
>   * returns an expected error code when provided an invalid initialization flag
>   * alongside FAN_REPORT_PIDFD. Additionally, it checks that the operability with
>   * existing FAN_REPORT_* flags is maintained and functioning as intended.
> + *
> + * NOTE: FAN_REPORT_PIDFD support was added in v5.15-rc1 in af579beb666a
> + * ("fanotify: add pidfd support to the fanotify API").
>   */
>  
>  #define _GNU_SOURCE
> @@ -39,7 +42,7 @@ static struct test_case_t {
>  	},
>  	{
>  		"pass on FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME",
> -		FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME ,
> +		FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME,
>  		0,
>  		0,
>  	},
> diff --git testcases/kernel/syscalls/fanotify/fanotify21.c testcases/kernel/syscalls/fanotify/fanotify21.c
> index e842dad17..6ae70c57e 100644
> --- testcases/kernel/syscalls/fanotify/fanotify21.c
> +++ testcases/kernel/syscalls/fanotify/fanotify21.c
> @@ -11,6 +11,9 @@
>   * A test which verifies whether the returned struct
>   * fanotify_event_info_pidfd in FAN_REPORT_PIDFD mode contains the
>   * expected set of information.
> + *
> + * NOTE: FAN_REPORT_PIDFD support was added in v5.15-rc1 in af579beb666a
> + * ("fanotify: add pidfd support to the fanotify API").
>   */
>  
>  #define _GNU_SOURCE
> @@ -56,7 +59,7 @@ struct test_case_t {
>  
>  static int fanotify_fd;
>  static char event_buf[BUF_SZ];
> -static struct pidfd_fdinfo_t *self_pidfd_fdinfo = NULL;
> +static struct pidfd_fdinfo_t *self_pidfd_fdinfo;
>  
>  static struct pidfd_fdinfo_t *read_pidfd_fdinfo(int pidfd)
>  {
> @@ -158,7 +161,7 @@ static void do_test(unsigned int num)
>  	 * buffer.
>  	 */
>  	len = SAFE_READ(0, fanotify_fd, event_buf, sizeof(event_buf));
> -	while(i < len) {
> +	while (i < len) {
>  		struct fanotify_event_metadata *event;
>  		struct fanotify_event_info_pidfd *info;
>  		struct pidfd_fdinfo_t *event_pidfd_fdinfo = NULL;
> @@ -197,7 +200,7 @@ static void do_test(unsigned int num)
>  			tst_res(TFAIL,
>  				"pidfd creation failed for pid: %u with pidfd error value "
>  				"set to: %d",
> -				(unsigned)event->pid,
> +				(unsigned int)event->pid,
>  				info->pidfd);
>  			goto next_event;
>  		} else if (tc->want_pidfd_err &&
> @@ -205,14 +208,14 @@ static void do_test(unsigned int num)
>  			tst_res(TFAIL,
>  				"pidfd set to an unexpected error: %d for pid: %u",
>  				info->pidfd,
> -				(unsigned)event->pid);
> +				(unsigned int)event->pid);
>  			goto next_event;
>  		} else if (tc->want_pidfd_err &&
>  			   info->pidfd == tc->want_pidfd_err) {
>  			tst_res(TPASS,
>  				"pid: %u terminated before pidfd was created, "
>  				"pidfd set to the value of: %d, as expected",
> -				(unsigned)event->pid,
> +				(unsigned int)event->pid,
>  				FAN_NOPIDFD);
>  			goto next_event;
>  		}
> @@ -227,15 +230,15 @@ static void do_test(unsigned int num)
>  				"reading fdinfo for pidfd: %d "
>  				"describing pid: %u failed",
>  				info->pidfd,
> -				(unsigned)event->pid);
> +				(unsigned int)event->pid);
>  			goto next_event;
>  		} else if (event_pidfd_fdinfo->pid != event->pid) {
>  			tst_res(TFAIL,
>  				"pidfd provided for incorrect pid "
>  				"(expected pidfd for pid: %u, got pidfd for "
>  				"pid: %u)",
> -				(unsigned)event->pid,
> -				(unsigned)event_pidfd_fdinfo->pid);
> +				(unsigned int)event->pid,
> +				(unsigned int)event_pidfd_fdinfo->pid);
>  			goto next_event;
>  		} else if (memcmp(event_pidfd_fdinfo, self_pidfd_fdinfo,
>  				  sizeof(struct pidfd_fdinfo_t))) {
> @@ -261,7 +264,7 @@ static void do_test(unsigned int num)
>  				"mask: %lld, pid: %u, fd: %d, "
>  				"pidfd: %d, info_type: %d, info_len: %d",
>  				(unsigned long long)event->mask,
> -				(unsigned)event->pid,
> +				(unsigned int)event->pid,
>  				event->fd,
>  				info->pidfd,
>  				info->hdr.info_type,

/M

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

Re: [LTP] [PATCH v3 1/3] syscalls/fanotify: Add a helper macro which checks for the presence of specific fanotify initialization flag(s)

[Petr Vorel]

Hi Matthew, Amir,

> On Mon, Nov 15, 2021 at 10:20:18PM +0100, Petr Vorel wrote:
> > Hi Matthew, Amir,

> > Tested on two distro kernels with support (Tumbleweed and Debian unstable)
> > + on various old kernels without support.

> > Merged with very minor fixes, see diff below.

> Noted the changes, they're fine by me. Thanks for the merge!
+1

> > NOTE: we now support basic static analysis + checkpatch formatting check - run
> > make check in fanotify directory or make check-fanotify20.

> Oh, that's great, I had no idea. Quickly running it, looks like
> there's a bunch of clean up required for some of the older tests. Will
> have to get around to doing that at some point.

Thanks a lot, that's really appreciated.
Also, thanks a lot you and Amir for really maintaining fanotify tests.

Kind regards,
Petr

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

[LTP] [PATCH v3 2/3] syscalls/fanotify20: add new test for FAN_REPORT_PIDFD

[Matthew Bobrowski via ltp]

This test ensures that the fanotify API returns the expected error
status code -EINVAL when an invalid flag is supplied alongside the new
FAN_REPORT_PIDFD initialization flag. Currently, FAN_REPORT_TID is the
only initialization flag that is not permitted in conjunction with
FAN_REPORT_PIDFD, so we explicitly provide test coverage for this.

We also add an extra trivial test case to ensure that the
initialization behavior with the other FAN_REPORT_* related flags is
working as intended.

Signed-off-by: Matthew Bobrowski <repnop@google.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
---
 testcases/kernel/syscalls/fanotify/.gitignore |   1 +
 testcases/kernel/syscalls/fanotify/fanotify.h |  21 +++
 .../kernel/syscalls/fanotify/fanotify20.c     | 128 ++++++++++++++++++
 3 files changed, 150 insertions(+)
 create mode 100644 testcases/kernel/syscalls/fanotify/fanotify20.c

diff --git a/testcases/kernel/syscalls/fanotify/.gitignore b/testcases/kernel/syscalls/fanotify/.gitignore
index 9554b16b1..c99e6fff7 100644
--- a/testcases/kernel/syscalls/fanotify/.gitignore
+++ b/testcases/kernel/syscalls/fanotify/.gitignore
@@ -17,4 +17,5 @@
 /fanotify17
 /fanotify18
 /fanotify19
+/fanotify20
 /fanotify_child
diff --git a/testcases/kernel/syscalls/fanotify/fanotify.h b/testcases/kernel/syscalls/fanotify/fanotify.h
index e2db3c6f5..c91162d97 100644
--- a/testcases/kernel/syscalls/fanotify/fanotify.h
+++ b/testcases/kernel/syscalls/fanotify/fanotify.h
@@ -78,6 +78,9 @@ static inline int safe_fanotify_mark(const char *file, const int lineno,
 #define FAN_REPORT_NAME		0x00000800
 #define FAN_REPORT_DFID_NAME     (FAN_REPORT_DIR_FID | FAN_REPORT_NAME)
 #endif
+#ifndef FAN_REPORT_PIDFD
+#define FAN_REPORT_PIDFD	0x00000080
+#endif
 
 /* Non-uapi convenience macros */
 #ifndef FAN_REPORT_DFID_NAME_FID
@@ -125,6 +128,14 @@ static inline int safe_fanotify_mark(const char *file, const int lineno,
 #define FAN_OPEN_EXEC_PERM	0x00040000
 #endif
 
+/* Additional error status codes that can be returned to userspace */
+#ifndef FAN_NOPIDFD
+#define FAN_NOPIDFD		-1
+#endif
+#ifndef FAN_EPIDFD
+#define FAN_EPIDFD		-2
+#endif
+
 /* Flags required for unprivileged user group */
 #define FANOTIFY_REQUIRED_USER_INIT_FLAGS    (FAN_REPORT_FID)
 
@@ -164,6 +175,9 @@ typedef struct {
 #ifndef FAN_EVENT_INFO_TYPE_DFID
 #define FAN_EVENT_INFO_TYPE_DFID	3
 #endif
+#ifndef FAN_EVENT_INFO_TYPE_PIDFD
+#define FAN_EVENT_INFO_TYPE_PIDFD	4
+#endif
 
 #ifndef HAVE_STRUCT_FANOTIFY_EVENT_INFO_HEADER
 struct fanotify_event_info_header {
@@ -181,6 +195,13 @@ struct fanotify_event_info_fid {
 };
 #endif /* HAVE_STRUCT_FANOTIFY_EVENT_INFO_FID */
 
+#ifndef HAVE_STRUCT_FANOTIFY_EVENT_INFO_PIDFD
+struct fanotify_event_info_pidfd {
+	struct fanotify_event_info_header hdr;
+	int32_t pidfd;
+};
+#endif /* HAVE_STRUCT_FANOTIFY_EVENT_INFO_PIDFD */
+
 /* NOTE: only for struct fanotify_event_info_fid */
 #ifdef HAVE_STRUCT_FANOTIFY_EVENT_INFO_FID_FSID___VAL
 # define FSID_VAL_MEMBER(fsid, i) (fsid.__val[i])
diff --git a/testcases/kernel/syscalls/fanotify/fanotify20.c b/testcases/kernel/syscalls/fanotify/fanotify20.c
new file mode 100644
index 000000000..9960d85eb
--- /dev/null
+++ b/testcases/kernel/syscalls/fanotify/fanotify20.c
@@ -0,0 +1,128 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2021 Google. All Rights Reserved.
+ *
+ * Started by Matthew Bobrowski <repnop@google.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * This source file contains a test case which ensures that the fanotify API
+ * returns an expected error code when provided an invalid initialization flag
+ * alongside FAN_REPORT_PIDFD. Additionally, it checks that the operability with
+ * existing FAN_REPORT_* flags is maintained and functioning as intended.
+ */
+
+#define _GNU_SOURCE
+#include "tst_test.h"
+#include <errno.h>
+
+#ifdef HAVE_SYS_FANOTIFY_H
+#include "fanotify.h"
+
+#define MOUNT_PATH	"fs_mnt"
+
+static int fanotify_fd;
+
+static struct test_case_t {
+	char *name;
+	unsigned int init_flags;
+	int want_err;
+	int want_errno;
+} test_cases[] = {
+	{
+		"fail on FAN_REPORT_PIDFD | FAN_REPORT_TID",
+		FAN_REPORT_PIDFD | FAN_REPORT_TID,
+		1,
+		EINVAL,
+	},
+	{
+		"pass on FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME",
+		FAN_REPORT_PIDFD | FAN_REPORT_FID | FAN_REPORT_DFID_NAME ,
+		0,
+		0,
+	},
+};
+
+static void do_setup(void)
+{
+	/*
+	 * An explicit check for FAN_REPORT_PIDFD is performed early on in the
+	 * test initialization as it's a prerequisite for all test cases.
+	 */
+	REQUIRE_FANOTIFY_INIT_FLAGS_SUPPORTED_BY_KERNEL(FAN_REPORT_PIDFD);
+}
+
+static void do_test(unsigned int num)
+{
+	struct test_case_t *tc = &test_cases[num];
+
+	tst_res(TINFO, "Test #%d: %s", num, tc->name);
+
+	fanotify_fd = fanotify_init(tc->init_flags, O_RDONLY);
+	if (fanotify_fd < 0) {
+		if (!tc->want_err) {
+			tst_res(TFAIL,
+				"fanotify_fd=%d, fanotify_init(%x, O_RDONLY) "
+				"failed with error -%d but wanted success",
+				fanotify_fd, tc->init_flags, errno);
+			return;
+		}
+
+		if (errno != tc->want_errno) {
+			tst_res(TFAIL,
+				"fanotify_fd=%d, fanotify_init(%x, O_RDONLY) "
+				"failed with an unexpected error code -%d but "
+				"wanted -%d",
+				fanotify_fd, tc->init_flags,
+				errno, tc->want_errno);
+			return;
+		}
+
+		tst_res(TPASS,
+			"fanotify_fd=%d, fanotify_init(%x, O_RDONLY) "
+			"failed with error -%d as expected",
+			fanotify_fd, tc->init_flags, errno);
+		return;
+	}
+
+	/*
+	 * Catch test cases that had expected to receive an error upon calling
+	 * fanotify_init() but had unexpectedly resulted in a success.
+	 */
+	if (tc->want_err) {
+		tst_res(TFAIL,
+			"fanotify_fd=%d, fanotify_init(%x, O_RDONLY) "
+			"unexpectedly returned successfully, wanted error -%d",
+			fanotify_fd, tc->init_flags, tc->want_errno);
+		return;
+	}
+
+	tst_res(TPASS,
+		"fanotify_fd=%d, fanotify_init(%x, O_RDONLY) "
+		"successfully initialized notification group",
+		fanotify_fd, tc->init_flags);
+
+	SAFE_CLOSE(fanotify_fd);
+}
+
+static void do_cleanup(void)
+{
+	if (fanotify_fd >= 0)
+		SAFE_CLOSE(fanotify_fd);
+}
+
+static struct tst_test test = {
+	.setup = do_setup,
+	.test = do_test,
+	.tcnt = ARRAY_SIZE(test_cases),
+	.cleanup = do_cleanup,
+	.all_filesystems = 1,
+	.needs_root = 1,
+	.mntpoint = MOUNT_PATH,
+};
+
+#else
+	TST_TEST_TCONF("system doesn't have required fanotify support");
+#endif /* HAVE_SYS_FANOTIFY_H */
-- 
2.34.0.rc0.344.g81b53c2807-goog

/M

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

[LTP] [PATCH v3 3/3] syscalls/fanotify21: test returned pidfd from fanotify in FAN_REPORT_PIDFD mode

[Matthew Bobrowski via ltp]

This is a new test that performs verification on the values returned
within the struct fanotify_event_info_pidfd record when the
notification group has been initialized with the FAN_REPORT_PIDFD
flag.

Signed-off-by: Matthew Bobrowski <repnop@google.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
---
 testcases/kernel/syscalls/fanotify/.gitignore |   1 +
 .../kernel/syscalls/fanotify/fanotify21.c     | 306 ++++++++++++++++++
 2 files changed, 307 insertions(+)
 create mode 100644 testcases/kernel/syscalls/fanotify/fanotify21.c

diff --git a/testcases/kernel/syscalls/fanotify/.gitignore b/testcases/kernel/syscalls/fanotify/.gitignore
index c99e6fff7..35e73b91e 100644
--- a/testcases/kernel/syscalls/fanotify/.gitignore
+++ b/testcases/kernel/syscalls/fanotify/.gitignore
@@ -18,4 +18,5 @@
 /fanotify18
 /fanotify19
 /fanotify20
+/fanotify21
 /fanotify_child
diff --git a/testcases/kernel/syscalls/fanotify/fanotify21.c b/testcases/kernel/syscalls/fanotify/fanotify21.c
new file mode 100644
index 000000000..e842dad17
--- /dev/null
+++ b/testcases/kernel/syscalls/fanotify/fanotify21.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2021 Google. All Rights Reserved.
+ *
+ * Started by Matthew Bobrowski <repnop@google.com>
+ */
+
+/*\
+ * [Description]
+ *
+ * A test which verifies whether the returned struct
+ * fanotify_event_info_pidfd in FAN_REPORT_PIDFD mode contains the
+ * expected set of information.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include "tst_test.h"
+#include "tst_safe_stdio.h"
+#include "lapi/pidfd_open.h"
+
+#ifdef HAVE_SYS_FANOTIFY_H
+#include "fanotify.h"
+
+#define BUF_SZ		4096
+#define MOUNT_PATH	"fs_mnt"
+#define TEST_FILE	MOUNT_PATH "/testfile"
+
+struct pidfd_fdinfo_t {
+	int pos;
+	int flags;
+	int mnt_id;
+	int pid;
+	int ns_pid;
+};
+
+struct test_case_t {
+	char *name;
+	int fork;
+	int want_pidfd_err;
+} test_cases[] = {
+	{
+		"return a valid pidfd for event created by self",
+		0,
+		0,
+	},
+	{
+		"return invalid pidfd for event created by terminated child",
+		1,
+		FAN_NOPIDFD,
+	},
+};
+
+static int fanotify_fd;
+static char event_buf[BUF_SZ];
+static struct pidfd_fdinfo_t *self_pidfd_fdinfo = NULL;
+
+static struct pidfd_fdinfo_t *read_pidfd_fdinfo(int pidfd)
+{
+	char *fdinfo_path;
+	struct pidfd_fdinfo_t *pidfd_fdinfo;
+
+	pidfd_fdinfo = SAFE_MALLOC(sizeof(struct pidfd_fdinfo_t));
+
+	SAFE_ASPRINTF(&fdinfo_path, "/proc/self/fdinfo/%d", pidfd);
+	SAFE_FILE_LINES_SCANF(fdinfo_path, "pos: %d", &pidfd_fdinfo->pos);
+	SAFE_FILE_LINES_SCANF(fdinfo_path, "flags: %d", &pidfd_fdinfo->flags);
+	SAFE_FILE_LINES_SCANF(fdinfo_path, "mnt_id: %d", &pidfd_fdinfo->mnt_id);
+	SAFE_FILE_LINES_SCANF(fdinfo_path, "Pid: %d", &pidfd_fdinfo->pid);
+	SAFE_FILE_LINES_SCANF(fdinfo_path, "NSpid: %d", &pidfd_fdinfo->ns_pid);
+
+	free(fdinfo_path);
+
+	return pidfd_fdinfo;
+}
+
+static void generate_event(void)
+{
+	int fd;
+
+	/* Generate a single FAN_OPEN event on the watched object. */
+	fd = SAFE_OPEN(TEST_FILE, O_RDONLY);
+	SAFE_CLOSE(fd);
+}
+
+static void do_fork(void)
+{
+	int status;
+	pid_t child;
+
+	child = SAFE_FORK();
+	if (child == 0) {
+		SAFE_CLOSE(fanotify_fd);
+		generate_event();
+		exit(EXIT_SUCCESS);
+	}
+
+	SAFE_WAITPID(child, &status, 0);
+	if (WIFEXITED(status) && WEXITSTATUS(status) != 0)
+		tst_brk(TBROK,
+			"child process terminated incorrectly");
+}
+
+static void do_setup(void)
+{
+	int pidfd;
+
+	SAFE_TOUCH(TEST_FILE, 0666, NULL);
+
+	/*
+	 * An explicit check for FAN_REPORT_PIDFD is performed early
+	 * on in the test initialization as it's a prerequisite for
+	 * all test cases.
+	 */
+	REQUIRE_FANOTIFY_INIT_FLAGS_SUPPORTED_BY_KERNEL(FAN_REPORT_PIDFD);
+
+	fanotify_fd = SAFE_FANOTIFY_INIT(FAN_REPORT_PIDFD, O_RDONLY);
+	SAFE_FANOTIFY_MARK(fanotify_fd, FAN_MARK_ADD, FAN_OPEN, AT_FDCWD,
+			   TEST_FILE);
+
+	pidfd = pidfd_open(getpid(), 0);
+	if (pidfd < 0) {
+		tst_brk(TBROK | TERRNO,
+			"pidfd=%d, pidfd_open(%d, 0) failed",
+			pidfd, getpid());
+	}
+
+	self_pidfd_fdinfo = read_pidfd_fdinfo(pidfd);
+	if (self_pidfd_fdinfo == NULL) {
+		tst_brk(TBROK,
+			"pidfd=%d, failed to read pidfd fdinfo",
+			pidfd);
+	}
+}
+
+static void do_test(unsigned int num)
+{
+	int i = 0, len;
+	struct test_case_t *tc = &test_cases[num];
+
+	tst_res(TINFO, "Test #%d: %s", num, tc->name);
+
+	/*
+	 * Generate the event in either self or a child process. Event
+	 * generation in a child process is done so that the FAN_NOPIDFD case
+	 * can be verified.
+	 */
+	if (tc->fork)
+		do_fork();
+	else
+		generate_event();
+
+	/*
+	 * Read all of the queued events into the provided event
+	 * buffer.
+	 */
+	len = SAFE_READ(0, fanotify_fd, event_buf, sizeof(event_buf));
+	while(i < len) {
+		struct fanotify_event_metadata *event;
+		struct fanotify_event_info_pidfd *info;
+		struct pidfd_fdinfo_t *event_pidfd_fdinfo = NULL;
+
+		event = (struct fanotify_event_metadata *)&event_buf[i];
+		info = (struct fanotify_event_info_pidfd *)(event + 1);
+
+		/*
+		 * Checks ensuring that pidfd information record object header
+		 * fields are set correctly.
+		 */
+		if (info->hdr.info_type != FAN_EVENT_INFO_TYPE_PIDFD) {
+			tst_res(TFAIL,
+				"unexpected info_type received in info "
+				"header (expected: %d, got: %d",
+				FAN_EVENT_INFO_TYPE_PIDFD,
+				info->hdr.info_type);
+			info = NULL;
+			goto next_event;
+		} else if (info->hdr.len !=
+			   sizeof(struct fanotify_event_info_pidfd)) {
+			tst_res(TFAIL,
+				"unexpected info object length "
+				"(expected: %lu, got: %d",
+				sizeof(struct fanotify_event_info_pidfd),
+				info->hdr.len);
+			info = NULL;
+			goto next_event;
+		}
+
+		/*
+		 * Check if pidfd information object reported any errors during
+		 * creation and whether they're expected.
+		 */
+		if (info->pidfd < 0 && !tc->want_pidfd_err) {
+			tst_res(TFAIL,
+				"pidfd creation failed for pid: %u with pidfd error value "
+				"set to: %d",
+				(unsigned)event->pid,
+				info->pidfd);
+			goto next_event;
+		} else if (tc->want_pidfd_err &&
+			   info->pidfd != tc->want_pidfd_err) {
+			tst_res(TFAIL,
+				"pidfd set to an unexpected error: %d for pid: %u",
+				info->pidfd,
+				(unsigned)event->pid);
+			goto next_event;
+		} else if (tc->want_pidfd_err &&
+			   info->pidfd == tc->want_pidfd_err) {
+			tst_res(TPASS,
+				"pid: %u terminated before pidfd was created, "
+				"pidfd set to the value of: %d, as expected",
+				(unsigned)event->pid,
+				FAN_NOPIDFD);
+			goto next_event;
+		}
+
+		/*
+		 * No pidfd errors occurred, continue with verifying pidfd
+		 * fdinfo validity.
+		 */
+		event_pidfd_fdinfo = read_pidfd_fdinfo(info->pidfd);
+		if (event_pidfd_fdinfo == NULL) {
+			tst_brk(TBROK,
+				"reading fdinfo for pidfd: %d "
+				"describing pid: %u failed",
+				info->pidfd,
+				(unsigned)event->pid);
+			goto next_event;
+		} else if (event_pidfd_fdinfo->pid != event->pid) {
+			tst_res(TFAIL,
+				"pidfd provided for incorrect pid "
+				"(expected pidfd for pid: %u, got pidfd for "
+				"pid: %u)",
+				(unsigned)event->pid,
+				(unsigned)event_pidfd_fdinfo->pid);
+			goto next_event;
+		} else if (memcmp(event_pidfd_fdinfo, self_pidfd_fdinfo,
+				  sizeof(struct pidfd_fdinfo_t))) {
+			tst_res(TFAIL,
+				"pidfd fdinfo values for self and event differ "
+				"(expected pos: %d, flags: %x, mnt_id: %d, "
+				"pid: %d, ns_pid: %d, got pos: %d, "
+				"flags: %x, mnt_id: %d, pid: %d, ns_pid: %d",
+				self_pidfd_fdinfo->pos,
+				self_pidfd_fdinfo->flags,
+				self_pidfd_fdinfo->mnt_id,
+				self_pidfd_fdinfo->pid,
+				self_pidfd_fdinfo->ns_pid,
+				event_pidfd_fdinfo->pos,
+				event_pidfd_fdinfo->flags,
+				event_pidfd_fdinfo->mnt_id,
+				event_pidfd_fdinfo->pid,
+				event_pidfd_fdinfo->ns_pid);
+			goto next_event;
+		} else {
+			tst_res(TPASS,
+				"got an event with a valid pidfd info record, "
+				"mask: %lld, pid: %u, fd: %d, "
+				"pidfd: %d, info_type: %d, info_len: %d",
+				(unsigned long long)event->mask,
+				(unsigned)event->pid,
+				event->fd,
+				info->pidfd,
+				info->hdr.info_type,
+				info->hdr.len);
+		}
+
+next_event:
+		i += event->event_len;
+		if (event->fd >= 0)
+			SAFE_CLOSE(event->fd);
+
+		if (info && info->pidfd >= 0)
+			SAFE_CLOSE(info->pidfd);
+
+		if (event_pidfd_fdinfo)
+			free(event_pidfd_fdinfo);
+	}
+}
+
+static void do_cleanup(void)
+{
+	if (fanotify_fd >= 0)
+		SAFE_CLOSE(fanotify_fd);
+
+	if (self_pidfd_fdinfo)
+		free(self_pidfd_fdinfo);
+}
+
+static struct tst_test test = {
+	.setup = do_setup,
+	.test = do_test,
+	.tcnt = ARRAY_SIZE(test_cases),
+	.cleanup = do_cleanup,
+	.all_filesystems = 1,
+	.needs_root = 1,
+	.mntpoint = MOUNT_PATH,
+	.forks_child = 1,
+};
+
+#else
+	TST_TEST_TCONF("system doesn't have required fanotify support");
+#endif /* HAVE_SYS_FANOTIFY_H */
-- 
2.34.0.rc0.344.g81b53c2807-goog

/M

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