[LTP] [PATCH v4 1/2] fsetxattr02: Adapt test for kernel 7.1.0+ socket xattr support

Jan Polensky
2026-03-18T11:13:51Z

Starting with kernel 7.1.0, sockets support extended attributes in the
user.* namespace. This behavior was enabled by dc0876b9846d ("xattr: support
extended attributes on sockets"), which permits user.* xattrs on S_IFSOCK
inodes (previously rejected with -EPERM).

Adapts the test to expect success (exp_err = 0) instead of EPERM when
testing fsetxattr(2) on sockets with kernel 7.1.0+.

Behavior:
- Kernel < 7.1.0: fsetxattr() on socket returns -EPERM (original behavior)
- Kernel >= 7.1.0: fsetxattr() on socket returns 0 (success, new behavior)

Signed-off-by: Jan Polensky <japo@linux.ibm.com>
---
testcases/kernel/syscalls/fsetxattr/fsetxattr02.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c b/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c
index 18490a865871..49dcd7cefbe8 100644
--- a/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c
+++ b/testcases/kernel/syscalls/fsetxattr/fsetxattr02.c
@@ -19,7 +19,10 @@
* - Set attribute to a block special file, fsetxattr(2) should
* return -1 and set errno to EPERM.
* - Set attribute to a UNIX domain socket, fsetxattr(2) should
- * return -1 and set errno to EPERM.
+ * return -1 and set errno to EPERM on kernels < 7.1.0.
+ * On kernel 7.1.0+ (dc0876b9846d "xattr: support extended
+ * attributes on sockets"), returns 0 (success) as sockets now
+ * support user.* xattrs.
*/

/*
@@ -62,6 +65,8 @@
#define BLK MNTPOINT"/fsetxattr02blk"
#define SOCK "fsetxattr02sock"

+static bool socket_xattr_supported;
+
struct test_case {
char *fname;
int fd;
@@ -73,7 +78,9 @@ struct test_case {
int exp_err;
int issocket;
int needskeyset;
+ bool check_xattr;
};
+
static struct test_case tc[] = {
{ /* case 00, set attr to reg */
.fname = FILENAME,
@@ -139,6 +146,7 @@ static struct test_case tc[] = {
.flags = XATTR_CREATE,
.exp_err = EPERM,
.issocket = 1,
+ .check_xattr = true,
},
};

@@ -152,6 +160,9 @@ static void verify_fsetxattr(unsigned int i)
XATTR_CREATE);
}

+ if (tc[i].check_xattr && socket_xattr_supported)
+ tc[i].exp_err = 0;
+
TEST(fsetxattr(tc[i].fd, tc[i].key, tc[i].value, tc[i].size,
tc[i].flags));

@@ -233,6 +244,8 @@ static void setup(void)
SAFE_BIND(tc[i].fd, (const struct sockaddr *) &sun,
sizeof(struct sockaddr_un));
}
+
+ socket_xattr_supported = (tst_kvercmp(7, 1, 0) >= 0);
}

static void cleanup(void)
--
2.53.0