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Linus Torvalds db3d841ac9 fs/pidfs: make 'lsof' happy with our inode changes 
pidfs started using much saner inodes in commit b28ddcc32d ("pidfs:
convert to path_from_stashed() helper"), but that exposed the fact that
lsof had some knowledge of just how odd our old anon_inode usage was.

For example, legacy anon_inodes hadn't even initialized the inode type
in the inode mode, so everything had a type of zero.

So sane tools like 'stat' would report these files as "weird file", but
'lsof' instead used that (together with the name of the link in proc) to
notice that it's an anonymous inode, and used it to detect pidfd files.

Let's keep our internal new sane inode model, but mask the file type
bits at 'stat()' time in the getattr() function we already have, and by
making the dentry name match what lsof expects too.

This keeps our internal models sane, but should make user space see the
same old odd behavior.

Reported-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/all/a15b1050-4b52-4740-a122-a4d055c17f11@kernel.org/
Link: https://github.com/lsof-org/lsof/issues/317
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Seth Forshee <sforshee@kernel.org>
Cc: Tycho Andersen <tycho@tycho.pizza>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2024-05-21 08:08:00 -07:00
arch asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
block Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation soc: devicetree updates for v6.10, part 2 2024-05-20 15:11:53 -07:00
drivers asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
fs fs/pidfs: make 'lsof' happy with our inode changes 2024-05-21 08:08:00 -07:00
include asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
init Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
io_uring The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel VFIO updates for v6.10-rc1 2024-05-20 14:56:50 -07:00
lib Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
net dma-mapping updates for Linux 6.10 2024-05-20 10:23:39 -07:00
rust The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
samples Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
scripts Coccinelle commits for 6.10 2024-05-20 16:00:04 -07:00
security The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
sound The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
tools asm-generic cleanups for 6.10 2024-05-20 15:18:34 -07:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt The usual shower of singleton fixes and minor series all over MM, 2024-05-19 09:21:03 -07:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig Add .editorconfig file for basic formatting 2023-12-28 16:22:47 +09:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap Another not-too-busy cycle for documentation, including: 2024-05-13 10:51:53 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Drop Gustavo Pimentel as PCI DWC Maintainer 2024-03-27 13:41:02 -05:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS VFIO updates for v6.10-rc1 2024-05-20 14:56:50 -07:00
Makefile Kbuild updates for v6.10 2024-05-18 12:39:20 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.