Richard W.M. Jones
3e42979e65
procfs: expose umask in /proc/<PID>/status ...
It's not possible to read the process umask without also modifying it,
which is what umask(2) does. A library cannot read umask safely,
especially if the main program might be multithreaded.
Add a new status line ("Umask") in /proc/<PID>/status. It contains the
file mode creation mask (umask) in octal. It is only shown for tasks
which have task->fs.
This patch is adapted from one originally written by Pierre Carrier.
The use case is that we have endless trouble with people setting weird
umask() values (usually on the grounds of "security"), and then
everything breaking. I'm on the hook to fix these. We'd like to add
debugging to our program so we can dump out the umask in debug reports.
Previous versions of the patch used a syscall so you could only read
your own umask. That's all I need. However there was quite a lot of
push-back from those, so this new version exports it in /proc.
See:
https://lkml.org/lkml/2016/4/13/704 [umask2]
https://lkml.org/lkml/2016/4/13/487 [getumask]
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Acked-by: Konstantin Khlebnikov <koct9i@gmail.com>
Acked-by: Jerome Marchand <jmarchan@redhat.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Pierre Carrier <pierre@spotify.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-05-20 17:58:30 -07:00
FS-Cache: Count the number of initialised operations
2015-04-02 14:28:53 +01:00
Documentation: fix common spelling mistakes
2016-04-28 07:51:59 -06:00
configfs: switch ->default groups to a linked list
2016-03-06 16:11:24 +01:00
Various bugfixes, a RDMA update from Chuck Lever, and support for a new
2016-03-24 19:50:32 -07:00
Documentation: fix common spelling mistakes
2016-04-28 07:51:59 -06:00
Documentation: update .gitignore files
2014-09-26 11:02:59 +02:00
dax: replace XIP documentation with DAX documentation
2015-02-16 17:56:03 -08:00
9p: update documentation
2014-01-24 10:55:21 -06:00
adfs: add hexadecimal filetype suffix option
2011-03-22 17:44:17 -07:00
affs: add mount option to avoid filename truncates
2014-04-07 16:36:08 -07:00
doc: fix double words
2014-03-21 13:16:58 +01:00
autofs: the documentation I wanted to read
2014-10-14 02:18:17 +02:00
Documentation: remove outdated information from automount-support.txt
2015-05-15 01:10:38 -04:00
Documentation: befs.txt: no maintainer, orphaned
2011-08-13 18:34:03 -07:00
Documentation: btrfs: remove usage specific information
2016-03-11 17:02:09 +01:00
ceph: enable/disable dentry complete flags via mount option
2012-01-12 11:00:40 -08:00
mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage
2016-04-04 10:41:08 -07:00
dax: add huge page fault support
2015-09-08 15:35:28 -07:00
debugfs: Pass bool pointer to debugfs_create_bool()
2015-10-04 11:36:07 +01:00
TTY, devpts: document pty count limiting
2016-03-07 16:11:14 -08:00
vfs: take i_mutex on renamed file
2013-11-09 00:16:40 -05:00
ocfs2: update web page + git tree in documentation
2015-02-28 09:57:50 -08:00
Documentation/fs/: split txt and source files
2010-03-12 15:52:35 -08:00
efi: Make efivarfs entries immutable by default
2016-02-10 16:25:52 +00:00
exofs: Add option to mount by osdname
2011-03-15 15:02:51 +02:00
fs: Remove ext3 filesystem driver
2015-07-23 20:59:40 +02:00
fs: Remove ext3 filesystem driver
2015-07-23 20:59:40 +02:00
ext4: add DAX functionality
2015-02-16 17:56:04 -08:00
f2fs: introduce new option for controlling data flush
2015-12-16 09:25:48 -08:00
fsioctl.c: make generic_block_fiemap() signal-tolerant
2015-02-10 14:30:30 -08:00
Wrap accesses to the fd_sets in struct fdtable
2012-02-19 10:30:52 -08:00
gfs2: Remove gl_spin define
2015-10-29 12:57:48 -05:00
Documentation: Fix multiple typo in Documentation
2012-03-07 16:08:24 +01:00
GFS2: Update main gfs2 doc
2012-05-10 11:45:31 +01:00
Documentation: HFS is orphaned
2011-11-04 12:01:48 -07:00
Documentation: update URL to hfsplus Technote 1150
2014-02-20 14:48:51 +01:00
inotify: update documentation to reflect code changes
2015-02-10 14:30:28 -08:00
doc: fix misspellings with 'codespell' tool
2013-05-28 12:02:12 +02:00
direct-io: eliminate the offset argument to ->direct_IO
2016-05-01 19:58:39 -04:00
doc: fix broken references
2011-09-27 18:08:04 +02:00
configfs: remove old API
2015-10-13 22:17:57 -07:00
locks: add warning about mandatory locking races
2007-10-09 18:32:45 -04:00
nilfs2: update project's web site in nilfs2.txt
2014-04-03 16:21:26 -07:00
NTFS: Remove changelog from Documentation/filesystems/ntfs.txt.
2014-10-16 12:43:57 +01:00
ocfs2: add feature document for online file check
2016-03-22 15:36:02 -07:00
ocfs2: update web page + git tree in documentation
2015-02-28 09:57:50 -08:00
Orangefs: update orangefs.txt
2016-02-26 14:39:08 -05:00
Remove email address from Documentation/filesystems/overlayfs.txt
2015-11-11 10:04:53 -07:00
Documentation: add new description of path-name lookup.
2015-11-02 18:18:25 -07:00
Documentation: add new description of path-name lookup.
2015-11-02 18:18:25 -07:00
lookup_open(): lock the parent shared unless O_CREAT is given
2016-05-02 19:51:17 -04:00
procfs: expose umask in /proc/<PID>/status
2016-05-20 17:58:30 -07:00
Documentation: fix common spelling mistakes
2016-04-28 07:51:59 -06:00
quota: Update documentation
2015-05-18 11:23:07 +02:00
initmpfs: use initramfs if rootfstype= or root= specified
2013-09-11 15:59:38 -07:00
doc: Fix typo in doucmentations
2013-07-25 12:34:15 +02:00
Documentation/filesystems/romfs.txt: fixing link to genromfs
2011-02-17 22:04:46 +01:00
Documentation: update seq_file
2014-12-29 15:40:18 -07:00
doc: fix grammar
2016-03-09 15:33:06 -07:00
Squashfs: Add LZ4 compression configuration option
2014-11-27 18:48:44 +00:00
sysfs-tagging.txt: fix pre-kernfs references
2015-09-13 14:38:51 -06:00
sysfs.txt: mention that store method buffers are null-terminated
2015-09-13 14:38:51 -06:00
mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage
2016-04-04 10:41:08 -07:00
UBIFS: switch self-check knobs to debugfs
2011-07-04 10:54:28 +03:00
fat: add config option to set UTF-8 mount option by default
2016-03-22 15:36:02 -07:00
direct-io: eliminate the offset argument to ->direct_IO
2016-05-01 19:58:39 -04:00
Fix common misspellings
2011-03-31 11:26:23 -03:00
xfs: add metadata CRC documentation
2013-04-27 13:27:43 -05:00
xfs: fix kernel version in docs
2015-06-01 07:15:38 +10:00
3e42979e65