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6140be90ec
linux/fs
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Christian Göttsche 6140be90ec fs/xattr: add *at family syscalls 
Add the four syscalls setxattrat(), getxattrat(), listxattrat() and
removexattrat().  Those can be used to operate on extended attributes,
especially security related ones, either relative to a pinned directory
or on a file descriptor without read access, avoiding a
/proc/<pid>/fd/<fd> detour, requiring a mounted procfs.

One use case will be setfiles(8) setting SELinux file contexts
("security.selinux") without race conditions and without a file
descriptor opened with read access requiring SELinux read permission.

Use the do_{name}at() pattern from fs/open.c.

Pass the value of the extended attribute, its length, and for
setxattrat(2) the command (XATTR_CREATE or XATTR_REPLACE) via an added
struct xattr_args to not exceed six syscall arguments and not
merging the AT_* and XATTR_* flags.

[AV: fixes by Christian Brauner folded in, the entire thing rebased on
top of {filename,file}_...xattr() primitives, treatment of empty
pathnames regularized.  As the result, AT_EMPTY_PATH+NULL handling
is cheap, so f...(2) can use it]

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Link: https://lore.kernel.org/r/20240426162042.191916-1-cgoettsche@seltendoof.de
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
CC: x86@kernel.org
CC: linux-alpha@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org
CC: linux-ia64@vger.kernel.org
CC: linux-m68k@lists.linux-m68k.org
CC: linux-mips@vger.kernel.org
CC: linux-parisc@vger.kernel.org
CC: linuxppc-dev@lists.ozlabs.org
CC: linux-s390@vger.kernel.org
CC: linux-sh@vger.kernel.org
CC: sparclinux@vger.kernel.org
CC: linux-fsdevel@vger.kernel.org
CC: audit@vger.kernel.org
CC: linux-arch@vger.kernel.org
CC: linux-api@vger.kernel.org
CC: linux-security-module@vger.kernel.org
CC: selinux@vger.kernel.org
[brauner: slight tweaks]
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2024-11-06 12:59:44 -05:00
..
9p netfs: Speed up buffered reading 2024-09-12 12:20:41 +02:00
adfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
affs affs-for-6.12-tag 2024-09-16 13:07:59 +02:00
afs netfs: Speed up buffered reading 2024-09-12 12:20:41 +02:00
autofs autofs: add per dentry expire timeout 2024-08-30 08:22:36 +02:00
bcachefs bcachefs fixes for 6.11-rc1 2024-09-29 09:17:44 -07:00
befs befs: Convert befs_symlink_read_folio() to use folio_end_read() 2024-05-31 12:31:39 +02:00
bfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
btrfs for-6.12-tag 2024-09-23 11:49:02 -07:00
cachefiles cachefiles, netfs: Fix write to partial block at EOF 2024-09-12 12:20:41 +02:00
ceph Three CephFS fixes from Xiubo and Luis and a bunch of assorted 2024-09-28 08:40:36 -07:00
coda coda: use param->file for FSCONFIG_SET_FD 2024-08-19 13:45:03 +02:00
configfs fs/configfs: Add a callback to determine attribute visibility 2024-06-17 20:42:57 +02:00
cramfs vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
crypto The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
debugfs [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
devpts
dlm [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
ecryptfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
efivarfs [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
efs vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
erofs erofs: reject inodes with negative i_size 2024-09-12 23:00:09 +08:00
exfat exfat: resolve memory leak from exfat_create_upcase_table() 2024-09-23 21:38:13 +09:00
exportfs fhandle: relax open_by_handle_at() permission checks 2024-05-28 15:57:23 +02:00
ext2 vfs-6.12.file 2024-09-16 09:14:02 +02:00
ext4 struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
f2fs f2fs-6.12-rc1 2024-09-24 15:12:38 -07:00
fat fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
freevxfs freevxfs: Convert freevxfs to the new mount API. 2024-03-26 09:04:53 +01:00
fuse [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
gfs2 gfs2 changes 2024-09-23 11:55:17 -07:00
hfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
hfsplus fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
hostfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
hpfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
hugetlbfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
iomap vfs-6.12.blocksize 2024-09-20 17:53:17 -07:00
isofs isofs: Annotate struct SL_component with __counted_by() 2024-09-02 15:52:56 +02:00
jbd2 jbd2: remove unneeded check of ret in jbd2_fc_get_buf 2024-08-26 23:49:15 -04:00
jffs2 jffs2: Use a folio in jffs2_garbage_collect_dnode() 2024-08-19 13:40:00 +02:00
jfs A few fixes for jfs 2024-09-19 06:38:43 +02:00
kernfs kernfs: mount: Remove unnecessary ‘NULL’ values from knparent 2024-05-04 19:02:39 +02:00
lockd sunrpc: allow svc threads to fail initialisation cleanly 2024-09-20 19:31:03 -04:00
minix buffer: Convert __block_write_begin() to take a folio 2024-08-07 11:33:36 +02:00
netfs netfs: Fix write oops in generic/346 (9p) and generic/074 (cifs) 2024-09-26 17:45:20 -05:00
nfs NFS Client Updates for Linux 6.12 2024-09-24 15:44:18 -07:00
nfs_common nfs: add LOCALIO support 2024-09-23 15:03:30 -04:00
nfsd nfsd: implement server support for NFS_LOCALIO_PROGRAM 2024-09-23 15:03:30 -04:00
nilfs2 Many singleton patches - please see the various changelogs for details. 2024-09-21 08:20:50 -07:00
nls fs: nls: add missing MODULE_DESCRIPTION() macros 2024-06-03 16:37:07 +02:00
notify struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
ntfs3 fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
ocfs2 ocfs2: fix uninit-value in ocfs2_get_block() 2024-09-26 14:01:45 -07:00
omfs fs: Convert aops->write_begin to take a folio 2024-08-07 11:33:21 +02:00
openpromfs openpromfs: add missing MODULE_DESCRIPTION() macro 2024-06-20 09:46:01 +02:00
orangefs orangefs: Constify struct kobj_type 2024-09-20 19:34:00 -07:00
overlayfs ovl: fix file leak in ovl_real_fdget_meta() 2024-09-27 12:38:47 -07:00
proc Summary 2024-09-24 11:08:40 -07:00
pstore drm next for 6.12-rc1 2024-09-19 10:18:15 +02:00
qnx4 qnx4: add MODULE_DESCRIPTION() 2024-05-28 11:52:53 +02:00
qnx6 qnx6: Convert directory handling to use kmap_local 2024-08-07 11:31:56 +02:00
quota \n 2024-09-23 10:49:28 -07:00
ramfs mm: switch mm->get_unmapped_area() to a flag 2024-04-25 20:56:25 -07:00
reiserfs buffer: Convert __block_write_begin() to take a folio 2024-08-07 11:33:36 +02:00
romfs romfs: fix romfs_read_folio() 2024-08-21 22:32:58 +02:00
smb 5 smb3 server fixes 2024-09-28 08:35:21 -07:00
squashfs Many singleton patches - please see the various changelogs for details. 2024-09-21 08:20:50 -07:00
sysfs Merge 6.9-rc5 into driver-core-next 2024-04-23 13:27:43 +02:00
sysv buffer: Convert __block_write_begin() to take a folio 2024-08-07 11:33:36 +02:00
tests execve: Move KUnit tests to tests/ subdirectory 2024-07-22 18:25:47 -07:00
tracefs eventfs: Use list_del_rcu() for SRCU protected list variable 2024-09-05 10:18:48 -04:00
ubifs [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
udf vfs-6.12.file 2024-09-16 09:14:02 +02:00
ufs vfs-6.12.file 2024-09-16 09:14:02 +02:00
unicode unicode: add MODULE_DESCRIPTION() macros 2024-06-20 19:30:02 -04:00
vboxsf fs: Convert aops->write_end to take a folio 2024-08-07 11:32:02 +02:00
verity fsverity: expose verified fsverity built-in signatures to LSMs 2024-08-20 14:03:18 -04:00
xfs struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
zonefs iomap: add a private argument for iomap_file_buffered_write 2024-09-03 15:01:23 +02:00
aio.c fs/aio: Fix __percpu annotation of *cpu pointer in struct kioctx 2024-08-19 13:45:03 +02:00
anon_inodes.c fs: Create anon_inode_getfile_fmode() 2024-04-26 10:33:05 +02:00
attr.c nfsd-6.11 fixes: 2024-08-29 06:20:44 +12:00
backing-file.c backing-file: convert to using fops->splice_write 2024-08-23 13:08:31 +02:00
bad_inode.c
binfmt_elf_fdpic.c binfmt_elf_fdpic: fix AUXV size calculation when ELF_HWCAP2 is defined 2024-08-26 13:00:38 -07:00
binfmt_elf.c Revert "binfmt_elf, coredump: Log the reason of the failed core dumps" 2024-09-26 11:39:02 -07:00
binfmt_flat.c binfmt_flat: Fix corruption when not offsetting data start 2024-08-09 20:19:00 -07:00
binfmt_misc.c vfs-6.11.module.description 2024-07-15 11:14:59 -07:00
binfmt_script.c fs: binfmt: add missing MODULE_DESCRIPTION() macros 2024-05-28 12:06:51 +02:00
bpf_fs_kfuncs.c bpf: Add kfunc bpf_get_dentry_xattr() to read xattr from dentry 2024-08-07 11:26:54 -07:00
buffer.c vfs-6.12.folio 2024-09-16 08:54:30 +02:00
char_dev.c
compat_binfmt_elf.c
coredump.c Revert "binfmt_elf, coredump: Log the reason of the failed core dumps" 2024-09-26 11:39:02 -07:00
d_path.c
dax.c dax: use huge_zero_folio 2024-04-25 20:56:20 -07:00
dcache.c vfs-6.12.misc 2024-09-16 08:35:09 +02:00
direct-io.c fs/direct-io: Remove linux/prefetch.h include 2024-08-19 13:45:02 +02:00
drop_caches.c sysctl: treewide: constify the ctl_table argument of proc_handlers 2024-07-24 20:59:29 +02:00
eventfd.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
eventpoll.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
exec.c ALong with the usual shower of singleton patches, notable patch series in 2024-09-21 07:29:05 -07:00
fcntl.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
fhandle.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
file_table.c slab updates for 6.12 2024-09-18 08:53:53 +02:00
file.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
filesystems.c
fs_context.c
fs_parser.c fs_parse: add uid & gid option option parsing helpers 2024-07-02 06:20:49 +02:00
fs_pin.c
fs_struct.c
fs_types.c
fs-writeback.c inode: port __I_SYNC to var event 2024-08-30 08:22:39 +02:00
fsopen.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
init.c
inode.c bcachefs changes for 6.12-rc1 2024-09-23 10:05:41 -07:00
internal.h replace do_getxattr() with saner helpers. 2024-11-06 12:59:39 -05:00
ioctl.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
Kconfig NFS Client Updates for Linux 6.12 2024-09-24 15:44:18 -07:00
Kconfig.binfmt exec: Add KUnit test for bprm_stack_limits() 2024-06-19 13:13:55 -07:00
kernel_read_file.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
libfs.c vfs-6.12.folio 2024-09-16 08:54:30 +02:00
locks.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
Makefile bpf: introduce new VFS based BPF kfuncs 2024-08-06 09:01:41 -07:00
mbcache.c
mnt_idmapping.c fuse update for 6.12 2024-09-24 15:29:42 -07:00
mount.h vfs-6.12.mount 2024-09-16 11:15:26 +02:00
mpage.c buffer: Remove calls to set and clear the folio error flag 2024-05-31 12:31:43 +02:00
namei.c getname_maybe_null() - the third variant of pathname copy-in 2024-10-19 20:33:34 -04:00
namespace.c fuse update for 6.12 2024-09-24 15:29:42 -07:00
nsfs.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
open.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
pidfs.c pidfs: handle kernels without namespaces cleanly 2024-07-24 10:53:13 +02:00
pipe.c [tree-wide] finally take no_llseek out 2024-09-27 08:18:43 -07:00
pnode.c
pnode.h
posix_acl.c fs: Use in_group_or_capable() helper to simplify the code 2024-08-30 08:22:37 +02:00
proc_namespace.c fs: rename show_mnt_opts -> show_vfsmnt_opts 2024-06-28 14:36:43 +02:00
read_write.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
readdir.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
remap_range.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
select.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
seq_file.c seq_file: Simplify __seq_puts() 2024-05-02 16:28:20 +02:00
signalfd.c struct fd layout change (and conversion to accessor helpers) 2024-09-23 09:35:36 -07:00
splice.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
stack.c
stat.c getname_maybe_null() - the third variant of pathname copy-in 2024-10-19 20:33:34 -04:00
statfs.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
super.c vfs-6.12.misc 2024-09-16 08:35:09 +02:00
sync.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
sysctls.c
timerfd.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
userfaultfd.c mm/hugetlb: remove hugetlb_follow_page_mask() leftover 2024-09-01 20:25:57 -07:00
utimes.c introduce fd_file(), convert all accessors to it. 2024-08-12 22:00:43 -04:00
xattr.c fs/xattr: add *at family syscalls 2024-11-06 12:59:44 -05:00