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Aleksa Sarai 49a49d4420 procfs: block chmod on /proc/thread-self/comm 
commit ccf61486fe1e1a48e18c638d1813cda77b3c0737 upstream.

Due to an oversight in commit 1b3044e39a89 ("procfs: fix pthread
cross-thread naming if !PR_DUMPABLE") in switching from REG to NOD,
chmod operations on /proc/thread-self/comm were no longer blocked as
they are on almost all other procfs files.

A very similar situation with /proc/self/environ was used to as a root
exploit a long time ago, but procfs has SB_I_NOEXEC so this is simply a
correctness issue.

Ref: https://lwn.net/Articles/191954/
Ref: 6d76fa58b050 ("Don't allow chmod() on the /proc/<pid>/ files")
Fixes: 1b3044e39a89 ("procfs: fix pthread cross-thread naming if !PR_DUMPABLE")
Cc: stable@vger.kernel.org # v4.7+
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
Message-Id: <20230713141001.27046-1-cyphar@cyphar.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-09-19 12:22:52 +02:00
..
9p
9p: fix a bunch of checkpatch warnings
2022-08-17 14:24:07 +02:00
adfs
…
affs
affs: initialize fsdata in affs_truncate()
2023-02-01 08:27:06 +01:00
afs
afs: Fix vlserver probe RTT handling
2023-06-21 15:59:18 +02:00
autofs
autofs: fix wait name hash calculation in autofs_wait()
2021-10-20 21:09:02 -04:00
befs
isystem: ship and use stdarg.h
2021-08-19 09:02:55 +09:00
bfs
…
btrfs
btrfs: fix BUG_ON condition in btrfs_cancel_balance
2023-08-26 14:23:31 +02:00
cachefiles
fs: add is_idmapped_mnt() helper
2022-07-02 16:41:14 +02:00
ceph
ceph: defer stopping mdsc delayed_work
2023-08-11 15:13:56 +02:00
cifs
cifs: Release folio lock on fscache read hit.
2023-08-26 14:23:36 +02:00
coda
coda: Avoid partial allocation of sig_inputArgs
2023-03-10 09:39:50 +01:00
configfs
configfs: fix possible memory leak in configfs_create_dir()
2022-12-31 13:14:15 +01:00
cramfs
…
crypto
fscrypt: fix keyring memory leak on mount failure
2022-11-10 18:15:37 +01:00
debugfs
debugfs: fix error when writing negative value to atomic_t debugfs file
2022-12-31 13:14:03 +01:00
devpts
fsnotify: fix fsnotify hooks in pseudo filesystems
2022-02-01 17:27:01 +01:00
dlm
fs: dlm: fix mismatch of plock results from userspace
2023-08-30 16:18:11 +02:00
ecryptfs
fs: add is_idmapped_mnt() helper
2022-07-02 16:41:14 +02:00
efivarfs
…
efs
…
erofs
erofs: ensure that the post-EOF tails are all zeroed
2023-09-06 21:28:37 +01:00
exfat
exfat: check if filename entries exceeds max filename length
2023-08-26 14:23:37 +02:00
exportfs
exportfs: support idmapped mounts
2022-06-09 10:23:32 +02:00
ext2
ext2: Drop fragment support
2023-08-11 15:13:58 +02:00
ext4
ext4: fix unttached inode after power cut with orphan file feature enabled
2023-09-19 12:22:42 +02:00
f2fs
f2fs: fix to avoid NULL pointer dereference f2fs_write_end_io()
2023-07-23 13:47:46 +02:00
fat
fat: add ratelimit to fat*_ent_bread()
2022-06-09 10:22:42 +02:00
freevxfs
…
fscache
fscache: Remove an unused static variable
2021-10-04 22:13:12 +01:00
fuse
fuse: ioctl: translate ENOSYS in outarg
2023-07-27 08:46:54 +02:00
gfs2
gfs2: Fix possible data races in gfs2_show_options()
2023-08-26 14:23:24 +02:00
hfs
hfs: fix missing hfs_bnode_get() in __hfs_bnode_create
2023-03-10 09:39:57 +01:00
hfsplus
fs: hfsplus: remove WARN_ON() from hfsplus_cat_{read,write}_inode()
2023-05-24 17:36:43 +01:00
hostfs
hostfs: support splice_write
2021-08-26 22:28:02 +02:00
hpfs
…
hugetlbfs
hugetlbfs: fix null-ptr-deref in hugetlbfs_parse_param()
2022-12-31 13:14:44 +01:00
iomap
iomap: iomap_write_failed fix
2022-06-09 10:22:55 +02:00
isofs
isofs: Fix out of bound access for corrupted isofs image
2021-11-12 15:05:50 +01:00
jbd2
jbd2: fix a race when checking checkpoint buffer busy
2023-08-30 16:18:12 +02:00
jffs2
jffs2: reduce stack usage in jffs2_build_xattr_subsystem()
2023-07-23 13:47:34 +02:00
jfs
jfs: validate max amount of blocks before allocation.
2023-09-19 12:22:43 +02:00
kernfs
kernfs: fix missing kernfs_idr_lock to remove an ID from the IDR
2023-07-23 13:47:23 +02:00
ksmbd
ksmbd: no response from compound read
2023-09-19 12:22:27 +02:00
lockd
fs: lockd: avoid possible wrong NULL parameter
2023-09-19 12:22:43 +02:00
minix
minix: fix bug when opening a file with O_DIRECT
2022-04-13 20:59:10 +02:00
netfs
netfs: fix parameter of cleanup()
2021-12-29 12:28:59 +01:00
nfs
pNFS: Fix assignment of xprtdata.cred
2023-09-19 12:22:43 +02:00
nfs_common
nfs: Fix kerneldoc warning shown up by W=1
2021-10-04 22:02:17 +01:00
nfsd
NFSD: da_addr_body field missing in some GETDEVICEINFO replies
2023-09-19 12:22:43 +02:00
nilfs2
nilfs2: fix WARNING in mark_buffer_dirty due to discarded buffer reuse
2023-09-06 21:28:40 +01:00
nls
fs/nls: make load_nls() take a const parameter
2023-09-19 12:22:27 +02:00
notify
fanotify: disallow mount/sb marks on kernel internal pseudo fs
2023-07-23 13:47:36 +02:00
ntfs
ntfs: check overflow when iterating ATTR_RECORDs
2022-11-26 09:24:52 +01:00
ntfs3
fs/ntfs3: Mark ntfs dirty when on-disk struct is corrupted
2023-08-26 14:23:25 +02:00
ocfs2
fs: ocfs2: namei: check return value of ocfs2_add_entry()
2023-09-19 12:22:34 +02:00
omfs
…
openpromfs
…
orangefs
orangefs: Fix kmemleak in orangefs_{kernel,client}_debug_init()
2022-12-31 13:14:44 +01:00
overlayfs
ovl: Always reevaluate the file signature for IMA
2023-09-19 12:22:28 +02:00
proc
procfs: block chmod on /proc/thread-self/comm
2023-09-19 12:22:52 +02:00
pstore
pstore/ram: Add check for kstrdup
2023-07-23 13:46:48 +02:00
qnx4
qnx4: work around gcc false positive warning bug
2021-09-21 08:36:48 -07:00
qnx6
…
quota
quota: fix dqput() to follow the guarantees dquot_srcu should provide
2023-09-19 12:22:35 +02:00
ramfs
shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs
2023-07-23 13:47:33 +02:00
reiserfs
reiserfs: Check the return value from __getblk()
2023-09-19 12:22:30 +02:00
romfs
…
smbfs_common
cifs: Fix crash on unload of cifs_arc4.ko
2021-12-14 10:57:12 +01:00
squashfs
revert "squashfs: harden sanity check in squashfs_read_xattr_id_table"
2023-02-22 12:57:07 +01:00
sysfs
…
sysv
fs/sysv: Null check to prevent null-ptr-deref bug
2023-08-11 15:13:58 +02:00
tracefs
tracefs: Only clobber mode/uid/gid on remount if asked
2022-09-20 12:39:43 +02:00
ubifs
ubifs: Fix memory leak in do_rename
2023-05-17 11:50:14 +02:00
udf
udf: Handle error when adding extent to a file
2023-09-19 12:22:30 +02:00
ufs
isystem: ship and use stdarg.h
2021-08-19 09:02:55 +09:00
unicode
…
vboxsf
vboxfs: fix broken legacy mount signature checking
2021-09-27 11:26:21 -07:00
verity
fsverity: don't drop pagecache at end of FS_IOC_ENABLE_VERITY
2023-04-05 11:24:51 +02:00
xfs
xfs: verify buffer contents when we skip log replay
2023-06-14 11:13:09 +02:00
zonefs
zonefs: Fix error message in zonefs_file_dio_append()
2023-04-05 11:25:01 +02:00
aio.c
aio: fix mremap after fork null-deref
2023-02-22 12:57:05 +01:00
anon_inodes.c
…
attr.c
nfs: use vfs setgid helper
2023-08-30 16:18:19 +02:00
bad_inode.c
vfs: add rcu argument to ->get_acl() callback
2021-08-18 22:08:24 +02:00
binfmt_aout.c
binfmt: a.out: Fix bogus semicolon
2021-09-05 10:15:05 -07:00
binfmt_elf_fdpic.c
binfmt: Fix error return code in load_elf_fdpic_binary()
2023-01-12 11:58:46 +01:00
binfmt_elf.c
fs/binfmt_elf: Fix memory leak in load_elf_binary()
2022-11-03 23:59:12 +09:00
binfmt_flat.c
binfmt_flat: do not stop relocating GOT entries prematurely on riscv
2022-06-09 10:22:26 +02:00
binfmt_misc.c
binfmt_misc: fix shift-out-of-bounds in check_special_flags
2022-12-31 13:14:39 +01:00
binfmt_script.c
…
buffer.c
mm: fs: initialize fsdata passed to write_begin/write_end interface
2022-11-26 09:24:51 +01:00
char_dev.c
chardev: fix error handling in cdev_device_add()
2022-12-31 13:14:30 +01:00
compat_binfmt_elf.c
…
coredump.c
coredump: Use the vma snapshot in fill_files_note
2022-04-08 14:24:18 +02:00
d_path.c
d_path: make 'prepend()' fill up the buffer exactly on overflow
2021-09-02 10:07:29 -07:00
dax.c
fsdax: Fix infinite loop in dax_iomap_rw()
2022-09-28 11:11:56 +02:00
dcache.c
…
direct-io.c
…
drop_caches.c
fs: drop_caches: fix skipping over shadow cache inodes
2021-09-03 09:58:10 -07:00
eventfd.c
eventfd: prevent underflow for eventfd semaphores
2023-09-19 12:22:30 +02:00
eventpoll.c
epoll: ep_autoremove_wake_function should use list_del_init_careful
2023-06-21 15:59:14 +02:00
exec.c
exec: Copy oldsighand->action under spin-lock
2022-11-03 23:59:12 +09:00
fcntl.c
Merge branch 'akpm' (patches from Andrew)
2021-09-03 10:08:28 -07:00
fhandle.c
…
file_table.c
locks: fix TOCTOU race when granting write lease
2022-10-26 12:34:58 +02:00
file.c
file: reinstate f_pos locking optimization for regular files
2023-08-11 15:13:58 +02:00
filesystems.c
fs: simplify get_filesystem_list / get_all_fs_names
2021-08-23 01:25:40 -04:00
fs_context.c
fs: avoid empty option when generating legacy mount string
2023-07-23 13:47:34 +02:00
fs_parser.c
namei: Standardize callers of filename_lookup()
2021-09-07 16:07:47 -04:00
fs_pin.c
…
fs_struct.c
…
fs_types.c
…
fs-writeback.c
writeback: fix call of incorrect macro
2023-05-17 11:50:16 +02:00
fsopen.c
…
init.c
…
inode.c
fs: Establish locking order for unrelated directories
2023-07-23 13:47:33 +02:00
internal.h
nfs: use vfs setgid helper
2023-08-30 16:18:19 +02:00
ioctl.c
fs: fix an infinite loop in iomap_fiemap
2022-05-25 09:57:26 +02:00
Kconfig
4 cifs/smb3 fixes, one for DFS reconnect, and one to begin creating common headers for server and client and the other two to rename the cifs_common directory to smbfs_common to be more consistent ie change use of the name cifs to smb which is more accurate
2021-09-12 10:10:21 -07:00
Kconfig.binfmt
…
kernel_read_file.c
vfs: check fd has read access in kernel_read_file_from_fd()
2021-10-18 20:22:03 -10:00
libfs.c
libfs: add DEFINE_SIMPLE_ATTRIBUTE_SIGNED for signed value
2022-12-31 13:14:03 +01:00
locks.c
filelocks: use mount idmapping for setlease permission check
2023-03-17 08:49:02 +01:00
Makefile
io_uring: move to separate directory
2022-12-14 11:37:31 +01:00
mbcache.c
mbcache: Avoid nesting of cache->c_list_lock under bit locks
2023-01-12 11:59:20 +01:00
mount.h
…
mpage.c
…
namei.c
fs: Fix error checking for d_hash_and_lookup()
2023-09-19 12:22:30 +02:00
namespace.c
fs: drop peer group ids under namespace lock
2023-04-13 16:48:25 +02:00
no-block.c
…
nsfs.c
…
open.c
open: make RESOLVE_CACHED correctly test for O_TMPFILE
2023-08-11 15:13:57 +02:00
pipe.c
pipe: Fix missing lock in pipe_resize_ring()
2022-06-06 08:43:37 +02:00
pnode.c
pnode: terminate at peers of source
2023-01-12 11:58:47 +01:00
pnode.h
…
posix_acl.c
fs: fix acl translation
2022-07-02 16:41:17 +02:00
proc_namespace.c
fs: add is_idmapped_mnt() helper
2022-07-02 16:41:14 +02:00
read_write.c
vfs: fix copy_file_range() averts filesystem freeze protection
2022-12-19 12:36:39 +01:00
readdir.c
…
remap_range.c
fs/remap: constrain dedupe of EOF blocks
2022-07-21 21:24:14 +02:00
select.c
select: Fix indefinitely sleeping task in poll_schedule_timeout()
2022-01-29 10:58:25 +01:00
seq_file.c
rxrpc: Fix locking issue
2022-07-12 16:35:08 +02:00
signalfd.c
signalfd: use wake_up_pollfree()
2021-12-14 10:57:15 +01:00
splice.c
Revert "fs: check FMODE_LSEEK to control internal pipe splicing"
2022-10-26 12:34:17 +02:00
stack.c
…
stat.c
stat: fix inconsistency between struct stat and struct compat_stat
2022-04-27 14:38:57 +02:00
statfs.c
statfs: enforce statfs[64] structure initialization
2023-05-24 17:36:54 +01:00
super.c
fs: Protect reconfiguration of sb read-write from racing writes
2023-08-11 15:13:58 +02:00
sync.c
vfs: make sync_filesystem return errors from ->sync_fs
2022-04-27 14:38:50 +02:00
timerfd.c
…
userfaultfd.c
userfaultfd: open userfaultfds with O_RDONLY
2022-10-26 12:34:36 +02:00
utimes.c
…
xattr.c
fs: don't audit the capability check in simple_xattr_list()
2022-12-31 13:14:01 +01:00