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selftests/pidfd: decode pidfd file handles withou having to specify an fd

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Link: https://lore.kernel.org/20250624-work-pidfs-fhandle-v2-11-d02a04858fe3@kernel.org
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner
2025-06-24 17:06:35 +02:00
parent b95361481b
commit 914e6b1e85
3 changed files with 65 additions and 1 deletions
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tools/testing/selftests/pidfd/Makefile
+1 -1
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@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0-only
CFLAGS += -g $(KHDR_INCLUDES) -pthread -Wall
CFLAGS += -g $(KHDR_INCLUDES) $(TOOLS_INCLUDES) -pthread -Wall
TEST_GEN_PROGS := pidfd_test pidfd_fdinfo_test pidfd_open_test \
pidfd_poll_test pidfd_wait pidfd_getfd_test pidfd_setns_test \
tools/testing/selftests/pidfd/pidfd.h
+4
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@@ -19,6 +19,10 @@
#include "../kselftest.h"
#include "../clone3/clone3_selftests.h"
#ifndef FD_PIDFS_ROOT
#define FD_PIDFS_ROOT -10002
#endif
#ifndef P_PIDFD
#define P_PIDFD 3
#endif
tools/testing/selftests/pidfd/pidfd_file_handle_test.c
+60
View File
@@ -500,4 +500,64 @@ TEST_F(file_handle, valid_name_to_handle_at_flags)
ASSERT_EQ(close(pidfd), 0);
}
/*
* That we decode a file handle without having to pass a pidfd.
*/
TEST_F(file_handle, decode_purely_based_on_file_handle)
{
int mnt_id;
struct file_handle *fh;
int pidfd = -EBADF;
struct stat st1, st2;
fh = malloc(sizeof(struct file_handle) + MAX_HANDLE_SZ);
ASSERT_NE(fh, NULL);
memset(fh, 0, sizeof(struct file_handle) + MAX_HANDLE_SZ);
fh->handle_bytes = MAX_HANDLE_SZ;
ASSERT_EQ(name_to_handle_at(self->child_pidfd1, "", fh, &mnt_id, AT_EMPTY_PATH), 0);
ASSERT_EQ(fstat(self->child_pidfd1, &st1), 0);
pidfd = open_by_handle_at(FD_PIDFS_ROOT, fh, 0);
ASSERT_GE(pidfd, 0);
ASSERT_EQ(fstat(pidfd, &st2), 0);
ASSERT_TRUE(st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
ASSERT_EQ(close(pidfd), 0);
pidfd = open_by_handle_at(FD_PIDFS_ROOT, fh, O_CLOEXEC);
ASSERT_GE(pidfd, 0);
ASSERT_EQ(fstat(pidfd, &st2), 0);
ASSERT_TRUE(st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
ASSERT_EQ(close(pidfd), 0);
pidfd = open_by_handle_at(FD_PIDFS_ROOT, fh, O_NONBLOCK);
ASSERT_GE(pidfd, 0);
ASSERT_EQ(fstat(pidfd, &st2), 0);
ASSERT_TRUE(st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
ASSERT_EQ(close(pidfd), 0);
pidfd = open_by_handle_at(self->pidfd, fh, 0);
ASSERT_GE(pidfd, 0);
ASSERT_EQ(fstat(pidfd, &st2), 0);
ASSERT_TRUE(st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
ASSERT_EQ(close(pidfd), 0);
pidfd = open_by_handle_at(-EBADF, fh, 0);
ASSERT_LT(pidfd, 0);
pidfd = open_by_handle_at(AT_FDCWD, fh, 0);
ASSERT_LT(pidfd, 0);
free(fh);
}
TEST_HARNESS_MAIN