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05dab768fc
linux/fs
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Alexey Gladkov 05dab768fc proc: handle subset=pid separately in userns visibility checks 
When procfs is mounted with subset=pid, only the dynamic process-related
part of the filesystem remains visible. That part cannot be hidden by
overmounts, so checking whether an existing procfs mount is fully
visible does not make sense for this mode.

At the same time, a subset=pid procfs mount must not be used as evidence
that a later procfs mount would not reveal additional information. It
provides a restricted view of procfs, not the full filesystem view.

Mark subset=pid procfs instances as restricted variants. Ignore
restricted variants when looking for an already-visible mount, and allow
new restricted variants without consulting mnt_already_visible().

Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://patch.msgid.link/4d5e760c3d534dd2e05578d119cc408450053a98.1777278334.git.legion@kernel.org
Reviewed-by: Aleksa Sarai <aleksa@amutable.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
2026-05-11 23:13:02 +02:00
..
9p - 9p access flag fix (cannot change access flag since new mount API implem) 2026-04-24 13:37:26 -07:00
adfs ARM development for 7.1-rc1 2026-04-25 07:44:26 -07:00
affs Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
afs mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
autofs vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
befs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
bfs vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
btrfs tracing updates for v7.1: 2026-04-17 09:43:12 -07:00
cachefiles vfs-7.1-rc1.kino 2026-04-13 12:19:01 -07:00
ceph We have a series from Alex which extends CephFS client metrics with 2026-04-24 13:47:19 -07:00
coda coda cleanups and fixes 2026-04-21 14:03:10 -07:00
configfs Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
cramfs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
crypto fscrypt updates for 7.1 2026-04-13 17:29:12 -07:00
debugfs debugfs: fix placement of EXPORT_SYMBOL_GPL for debugfs_create_str() 2026-04-02 16:15:23 +02:00
devpts Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
dlm ipv6: convert CONFIG_IPV6 to built-in only and clean up Kconfigs 2026-03-29 11:21:22 -07:00
ecryptfs eCryptfs changes for 7.1-rc1 2026-04-20 10:54:17 -07:00
efivarfs Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
efs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
erofs Changes since the last update: 2026-04-21 11:16:04 -07:00
exfat Description for this pull request: 2026-04-13 16:57:31 -07:00
exportfs Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
ext2 \n 2026-04-15 19:22:16 -07:00
ext4 Various clean ups and bug fixes in ext4 for 7.1: 2026-04-17 17:08:31 -07:00
f2fs f2fs-for-7.1-rc1 2026-04-21 14:50:04 -07:00
fat vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
freevxfs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
fuse vfs-7.1-rc1.fixes 2026-04-23 17:08:04 -07:00
gfs2 gfs2 changes 2026-04-15 19:12:04 -07:00
hfs vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
hfsplus hfs/hfsplus updates for v7.1 2026-04-13 16:50:38 -07:00
hostfs Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
hpfs treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
hugetlbfs mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
iomap fscrypt updates for 7.1 2026-04-13 17:29:12 -07:00
isofs treewide: fix missed i_ino format specifier conversions 2026-03-06 14:31:30 +01:00
jbd2 Various clean ups and bug fixes in ext4 for 7.1: 2026-04-17 17:08:31 -07:00
jffs2 treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
jfs More robust data integrity checking and some fixes. 2026-04-15 19:29:18 -07:00
kernfs Driver core changes for 7.1-rc1 2026-04-13 19:03:11 -07:00
lockd NFSD 7.1 Release Notes 2026-04-20 10:44:02 -07:00
minix vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
netfs mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
nfs NFS client updates for Linux 7.1 2026-04-24 14:20:03 -07:00
nfs_common NFSD: Remove NFSERR_EAGAIN 2026-01-02 13:43:41 -05:00
nfsd NFSD 7.1 Release Notes 2026-04-20 10:44:02 -07:00
nilfs2 mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
nls fs/nls: Fix inconsistency between utf8_to_utf32() and utf32_to_utf8() 2025-12-01 11:58:06 +02:00
notify Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
ntfs ntfs: use page allocation for resident attribute inline data 2026-04-22 19:05:07 +09:00
ntfs3 Changes for 7.1-rc1 2026-04-20 10:59:47 -07:00
ocfs2 fs: RCU-ify filesystems list 2026-05-11 23:13:01 +02:00
omfs vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
openpromfs
orangefs Orangefs: changes for 7.1 2026-04-17 17:03:43 -07:00
overlayfs Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
proc proc: handle subset=pid separately in userns visibility checks 2026-05-11 23:13:02 +02:00
pstore mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
qnx4 vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
qnx6 vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
quota quota: Fix race of dquot_scan_active() with quota deactivation 2026-03-25 13:15:36 +01:00
ramfs folio_batch: rename pagevec.h to folio_batch.h 2026-04-05 13:53:07 -07:00
resctrl mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
romfs mm.git review status for linus..mm-stable 2026-02-18 20:50:32 -08:00
smb 18 ksmbd server fixes 2026-04-23 17:04:18 -07:00
squashfs Squashfs: check metadata block offset is within range 2026-02-24 11:13:27 -08:00
sysfs sysfs: remove trivial sysfs_get_tree() wrapper 2026-05-11 23:13:01 +02:00
tests fs/tests: exec: Remove bad test vector 2026-03-18 11:41:53 -07:00
tracefs tracefs fixes for v7.1: 2026-04-22 15:09:01 -07:00
ubifs mm.git review status for linus..mm-nonmm-stable 2026-04-16 20:11:56 -07:00
udf \n 2026-04-15 19:22:16 -07:00
ufs vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
unicode Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
vboxsf Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
verity vfs-7.1-rc1.kino 2026-04-13 12:19:01 -07:00
xfs xfs: new code for Linux 7.1 2026-04-13 17:03:48 -07:00
zonefs mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
aio.c fs: aio: reject partial mremap to avoid Null-pointer-dereference error 2026-04-24 00:34:59 +02:00
anon_inodes.c
attr.c fs: attr: fix comment formatting and spelling issues 2026-04-07 11:26:11 +02:00
backing-file.c lsm: add backing_file LSM hooks 2026-04-03 16:53:50 -04:00
bad_inode.c fs: refactor ->update_time handling 2026-01-12 14:01:32 +01:00
binfmt_elf_fdpic.c vfs-7.1-rc1.kino 2026-04-13 12:19:01 -07:00
binfmt_elf.c mm: unexport vm_brk_flags() and eliminate vm_flags parameter 2026-04-05 13:53:39 -07:00
binfmt_flat.c
binfmt_misc.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
binfmt_script.c
bpf_fs_kfuncs.c bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs 2026-01-02 12:04:28 -08:00
buffer.c vfs-7.1-rc1.fixes 2026-04-23 17:08:04 -07:00
char_dev.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
compat_binfmt_elf.c
coredump.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
d_path.c dcache: permit dynamic_dname()s up to NAME_MAX 2026-04-07 12:32:22 +02:00
dax.c dax changes for 7.1 2026-04-21 14:12:01 -07:00
dcache.c Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
direct-io.c
drop_caches.c
eventfd.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
eventpoll.c eventpoll: drop vestigial epi->dying flag 2026-04-24 00:37:01 +02:00
exec.c exec: use strnlen() in __set_task_comm 2026-04-01 12:26:07 -07:00
fcntl.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
fhandle.c Convert more 'alloc_obj' cases to default GFP_KERNEL arguments 2026-02-21 20:03:00 -08:00
file_attr.c vfs-7.0-rc2.fixes 2026-02-25 10:34:23 -08:00
file_table.c lsm/stable-7.1 PR 20260410 2026-04-13 15:17:28 -07:00
file.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
filesystems.c fs: cache the string generated by reading /proc/filesystems 2026-05-11 23:13:01 +02:00
fs_context.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
fs_dirent.c
fs_parser.c fs: remove fsparam_path / fs_param_is_path 2026-02-19 14:34:26 +01:00
fs_pin.c
fs_struct.c fs: add <linux/init_task.h> for 'init_fs' 2026-01-14 16:50:37 +01:00
fs-writeback.c vfs-7.1-rc1.fixes 2026-04-23 17:08:04 -07:00
fserror.c treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
fsopen.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
init.c struct filename series 2026-02-09 16:58:28 -08:00
inode.c Fixing livelocks in shrink_dcache_tree() 2026-04-21 07:30:44 -07:00
internal.h lsm/stable-7.1 PR 20260410 2026-04-13 15:17:28 -07:00
ioctl.c
Kconfig ntfs: add Kconfig and Makefile 2026-02-19 21:51:00 +09:00
Kconfig.binfmt
kernel_read_file.c
libfs.c vfs-7.1-rc1.bh.metadata 2026-04-13 12:46:42 -07:00
locks.c NFSD 7.1 Release Notes 2026-04-20 10:44:02 -07:00
Makefile ntfs: add Kconfig and Makefile 2026-02-19 21:51:00 +09:00
mbcache.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
mnt_idmapping.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
mount.h namespace: record fully visible mounts in list 2026-05-11 23:13:01 +02:00
mpage.c mm.git review status for linus..mm-stable 2026-04-15 12:59:16 -07:00
namei.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
namespace.c proc: handle subset=pid separately in userns visibility checks 2026-05-11 23:13:02 +02:00
nsfs.c vfs-7.1-rc1.kino 2026-04-13 12:19:01 -07:00
nullfs.c fs: add immutable rootfs 2026-01-12 16:52:09 +01:00
open.c fs: remove do_sys_truncate 2026-03-23 12:41:58 +01:00
pidfs.c vfs-7.1-rc1.pidfs 2026-04-13 13:27:11 -07:00
pipe.c treewide: change inode->i_ino from unsigned long to u64 2026-03-06 14:31:28 +01:00
pnode.c
pnode.h
posix_acl.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
proc_namespace.c
read_write.c fs: add setlease to generic_ro_fops and read-only filesystem directory operations 2026-01-12 10:55:45 +01:00
readdir.c fs: Replace user_access_{begin/end} by scoped user access 2026-03-24 14:44:02 +01:00
remap_range.c
select.c vfs-7.1-rc1.misc 2026-04-13 14:20:11 -07:00
seq_file.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
signalfd.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
splice.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
stack.c
stat.c statx: switch to CLASS(filename_maybe_null) 2026-01-16 12:52:04 -05:00
statfs.c user_statfs(): switch to CLASS(filename) 2026-01-16 12:52:04 -05:00
super.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
sync.c treewide: Replace kmalloc with kmalloc_obj for non-scalar types 2026-02-21 01:02:28 -08:00
sysctls.c
timerfd.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
userfaultfd.c userfaultfd: allow registration of ranges below mmap_min_addr 2026-04-18 00:10:56 -07:00
utimes.c do_utimes_path(): switch to CLASS(filename_uflags) 2026-01-16 12:52:03 -05:00
xattr.c xattr: support extended attributes on sockets 2026-03-02 11:06:42 +01:00