forked from mirrors/linux
25a6cc9a63
Test that anonymous inodes cannot be open()ed. Link: https://lore.kernel.org/20250407-work-anon_inode-v1-9-53a44c20d44e@kernel.org Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>
69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#define __SANE_USERSPACE_TYPES__
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#include <fcntl.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include "../kselftest_harness.h"
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#include "overlayfs/wrappers.h"
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TEST(anon_inode_no_chown)
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{
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int fd_context;
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fd_context = sys_fsopen("tmpfs", 0);
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ASSERT_GE(fd_context, 0);
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ASSERT_LT(fchown(fd_context, 1234, 5678), 0);
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ASSERT_EQ(errno, EOPNOTSUPP);
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EXPECT_EQ(close(fd_context), 0);
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}
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TEST(anon_inode_no_chmod)
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{
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int fd_context;
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fd_context = sys_fsopen("tmpfs", 0);
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ASSERT_GE(fd_context, 0);
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ASSERT_LT(fchmod(fd_context, 0777), 0);
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ASSERT_EQ(errno, EOPNOTSUPP);
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EXPECT_EQ(close(fd_context), 0);
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}
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TEST(anon_inode_no_exec)
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{
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int fd_context;
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fd_context = sys_fsopen("tmpfs", 0);
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ASSERT_GE(fd_context, 0);
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ASSERT_LT(execveat(fd_context, "", NULL, NULL, AT_EMPTY_PATH), 0);
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ASSERT_EQ(errno, EACCES);
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EXPECT_EQ(close(fd_context), 0);
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}
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TEST(anon_inode_no_open)
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{
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int fd_context;
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fd_context = sys_fsopen("tmpfs", 0);
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ASSERT_GE(fd_context, 0);
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ASSERT_GE(dup2(fd_context, 500), 0);
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ASSERT_EQ(close(fd_context), 0);
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fd_context = 500;
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ASSERT_LT(open("/proc/self/fd/500", 0), 0);
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ASSERT_EQ(errno, ENXIO);
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EXPECT_EQ(close(fd_context), 0);
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}
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TEST_HARNESS_MAIN
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