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b556db17b0
linux/fs
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Masatake YAMATO b556db17b0 eventfd: present id to userspace via fdinfo 
Finding endpoints of an IPC channel is one of essential task to
understand how a user program works.  Procfs and netlink socket provide
enough hints to find endpoints for IPC channels like pipes, unix
sockets, and pseudo terminals.  However, there is no simple way to find
endpoints for an eventfd file from userland.  An inode number doesn't
hint.  Unlike pipe, all eventfd files share the same inode object.

To provide the way to find endpoints of an eventfd file, this patch adds
"eventfd-id" field to /proc/PID/fdinfo of eventfd as identifier.
Integers managed by an IDA are used as ids.

A tool like lsof can utilize the information to print endpoints.

Link: http://lkml.kernel.org/r/20190327181823.20222-1-yamato@redhat.com
Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-05-14 19:52:51 -07:00
..
9p 9p: switch to ->free_inode() 2019-05-01 22:43:23 -04:00
adfs Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
affs Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
afs AFS Development 2019-05-07 20:51:58 -07:00
autofs autofs: fix use-after-free in lockless ->d_manage() 2019-04-09 19:18:19 -04:00
befs befs: switch to ->free_inode() 2019-05-01 22:43:23 -04:00
bfs bfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
btrfs for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
cachefiles
ceph Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
cifs cifs: update module internal version number 2019-05-07 23:24:56 -05:00
coda coda: switch to ->free_inode() 2019-05-01 22:43:26 -04:00
configfs fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
cramfs
crypto Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
debugfs Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:03:32 -07:00
devpts fs/devpts: always delete dcache dentry-s in dput() 2019-01-24 13:38:30 -05:00
dlm genetlink: optionally validate strictly/dumps 2019-04-27 17:07:22 -04:00
ecryptfs Merge branch 'work.icache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 10:57:05 -07:00
efivarfs
efs efs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
exportfs
ext2 \n 2019-05-13 14:59:55 -07:00
ext4 Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
f2fs f2fs-for-5.2-rc1 2019-05-14 08:55:43 -07:00
fat fs/fat/file.c: issue flush after the writeback of FAT 2019-05-14 19:52:50 -07:00
freevxfs freevxfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
fscache
fuse fuse update for 5.2 2019-05-14 08:59:14 -07:00
gfs2 gfs2: Fix error path kobject memory leak 2019-05-13 15:43:01 -07:00
hfs hfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
hfsplus hfsplus: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
hostfs This pull request contains the following changes for UML: 2019-05-12 17:52:13 -04:00
hpfs hpfs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
hugetlbfs hugetlbfs: always use address space in inode for resv_map pointer 2019-05-14 09:47:50 -07:00
isofs isofs: switch to ->free_inode() 2019-05-01 22:43:24 -04:00
jbd2 jbd2: check superblock mapped prior to committing 2019-04-06 18:57:40 -04:00
jffs2 Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
jfs Several minor jfs fixes 2019-05-07 11:37:27 -07:00
kernfs Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:03:32 -07:00
lockd lockd: Store the lockd client credential in struct nlm_host 2019-04-26 17:51:23 -04:00
minix minix: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
nfs NFS client updates for Linux 5.2 2019-05-09 14:33:15 -07:00
nfs_common
nfsd NFS client updates for Linux 5.2 2019-05-09 14:33:15 -07:00
nilfs2 nilfs2: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
nls
notify \n 2019-05-13 15:08:16 -07:00
ntfs ntfs: switch to ->free_inode() 2019-05-01 22:43:26 -04:00
ocfs2 ocfs2: fix ocfs2 read inode data panic in ocfs2_iget 2019-05-14 09:47:44 -07:00
omfs
openpromfs openpromfs: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
orangefs mm/gup: change GUP fast to use flags rather than a write 'bool' 2019-05-14 09:47:46 -07:00
overlayfs overlayfs update for 5.2 2019-05-14 09:02:14 -07:00
proc kernel/latencytop.c: rename clear_all_latency_tracing to clear_tsk_latency_tracing 2019-05-14 19:52:49 -07:00
pstore treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively 2019-04-09 14:19:06 +02:00
qnx4 qnx4: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
qnx6 qnx6: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
quota quota: check time limit when back out space/inode change 2019-04-30 18:05:55 +02:00
ramfs
reiserfs reiserfs: add comment to explain endianness issue in xattr_hash 2019-05-14 19:52:50 -07:00
romfs romfs: convert to ->free_inode() 2019-05-01 22:43:25 -04:00
squashfs squashfs: switch to ->free_inode() 2019-05-01 22:43:25 -04:00
sysfs Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-03-16 10:31:02 -07:00
sysv Merge branch 'work.dcache' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:03:32 -07:00
tracefs
ubifs This pull request contains the following changes for UBI/UBIFS 2019-05-12 18:16:31 -04:00
udf \n 2019-05-13 14:59:55 -07:00
ufs Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
unicode unicode: refactor the rule for regenerating utf8data.h 2019-04-28 13:45:36 -04:00
xfs for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
aio.c aio: use kmem_cache_free() instead of kfree() 2019-04-04 20:13:59 -04:00
anon_inodes.c
attr.c
bad_inode.c
binfmt_aout.c a.out: remove core dumping support 2019-03-05 10:00:35 -08:00
binfmt_elf_fdpic.c
binfmt_elf.c binfmt_elf: move brk out of mmap when doing direct loader exec 2019-05-14 19:52:50 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c exec: load_script: Do not exec truncated interpreter path 2019-02-18 16:49:36 -08:00
block_dev.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:50:27 -07:00
buffer.c iomap: Fix use-after-free error in page_done callback 2019-05-01 07:47:37 -07:00
char_dev.c chardev: update comment based on the code 2019-04-02 17:49:58 +02:00
compat_binfmt_elf.c
compat_ioctl.c
compat.c
coredump.c
d_path.c
dax.c mm: page_mkclean vs MADV_DONTNEED race 2019-05-14 09:47:48 -07:00
dcache.c Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
dcookies.c
direct-io.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
drop_caches.c fs/drop_caches.c: avoid softlockups in drop_pagecache_sb() 2019-02-01 15:46:24 -08:00
eventfd.c eventfd: present id to userspace via fdinfo 2019-05-14 19:52:51 -07:00
eventpoll.c epoll: use rwlock in order to reduce ep_poll_callback() contention 2019-03-07 18:32:01 -08:00
exec.c fs/exec.c: move ->recursion_depth out of critical sections 2019-05-14 19:52:50 -07:00
fcntl.c fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
fhandle.c
file_table.c vfs: syscall: Add open_tree(2) to reference or clone a mount 2019-03-20 18:49:06 -04:00
file.c io_uring-2019-03-06 2019-03-08 14:48:40 -08:00
filesystems.c vfs: Implement a filesystem superblock creation/configuration context 2019-02-28 03:29:26 -05:00
fs_context.c vfs: syscall: Add fsconfig() for configuring and managing a context 2019-03-20 18:49:06 -04:00
fs_parser.c fs: fs_parser: fix printk format warning 2019-03-29 10:01:38 -07:00
fs_pin.c
fs_struct.c
fs_types.c fs: common implementation of file type 2019-01-21 17:48:13 +01:00
fs-writeback.c writeback: synchronize sync(2) against cgroup writeback membership switches 2019-01-22 14:39:38 -07:00
fsopen.c vfs: syscall: Add fspick() to select a superblock for reconfiguration 2019-03-20 18:49:06 -04:00
inode.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:50:27 -07:00
internal.h Merge branch 'work.mount-syscalls' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:17:51 -07:00
io_uring.c mm/gup: replace get_user_pages_longterm() with FOLL_LONGTERM 2019-05-14 09:47:45 -07:00
ioctl.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
iomap.c for-5.2/block-20190507 2019-05-07 18:14:36 -07:00
Kconfig unicode: introduce UTF-8 character database 2019-04-25 13:38:44 -04:00
Kconfig.binfmt
libfs.c Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-05-07 20:50:27 -07:00
locks.c Wimplicit-fallthrough patches for 5.2-rc1 2019-05-07 12:48:10 -07:00
Makefile Add as a feature case-insensitive directories (the casefold feature) 2019-05-07 21:12:44 -07:00
mbcache.c
mount.h saner handling of temporary namespaces 2019-01-30 17:44:07 -05:00
mpage.c block: remove the i argument to bio_for_each_segment_all 2019-04-30 09:26:13 -06:00
namei.c Clean up fscrypt's dcache revalidation support, and other 2019-05-07 21:28:04 -07:00
namespace.c do_move_mount(): fix an unsafe use of is_anon_ns() 2019-05-09 02:32:50 -04:00
no-block.c
nsfs.c nsfs: unobfuscate 2019-04-09 19:20:57 -04:00
open.c vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files 2019-05-06 17:46:52 +03:00
pipe.c Merge branch 'page-refs' (page ref overflow) 2019-04-14 15:09:40 -07:00
pnode.c separate copying and locking mount tree on cross-userns copies 2019-01-30 17:14:50 -05:00
pnode.h separate copying and locking mount tree on cross-userns copies 2019-01-30 17:14:50 -05:00
posix_acl.c
proc_namespace.c
read_write.c vfs: pass ppos=NULL to .read()/.write() of FMODE_STREAM files 2019-05-06 17:46:52 +03:00
readdir.c Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
select.c y2038: syscalls: rename y2038 compat syscalls 2019-02-07 00:13:27 +01:00
seq_file.c fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
signalfd.c fs: mark expected switch fall-throughs 2019-04-08 18:21:02 -05:00
splice.c There tracing fixes: 2019-04-26 11:09:55 -07:00
stack.c block: remove CONFIG_LBDAF 2019-04-06 10:48:35 -06:00
stat.c fs: move generic stat response attr handling to vfs_getattr_nosec 2019-02-01 01:55:45 -05:00
statfs.c vfs: add vfs_get_fsid() helper 2019-02-07 16:38:35 +01:00
super.c [fix] get rid of checking for absent device name in vfs_get_tree() 2019-04-28 21:34:21 -04:00
sync.c fs/sync.c: sync_file_range(2) may use WB_SYNC_ALL writeback 2019-05-14 09:47:50 -07:00
timerfd.c y2038: syscalls: rename y2038 compat syscalls 2019-02-07 00:13:27 +01:00
userfaultfd.c userfaultfd/sysctl: add vm.unprivileged_userfaultfd 2019-05-14 09:47:45 -07:00
utimes.c y2038: syscalls: rename y2038 compat syscalls 2019-02-07 00:13:27 +01:00
xattr.c