https://github.com/torvalds/linux
Revision 738a7832d21e3d911fcddab98ce260b79010b461 authored by Christian Brauner on 18 April 2019, 10:18:39 UTC, committed by Linus Torvalds on 18 April 2019, 15:35:18 UTC
As stated in the original commit for pidfd_send_signal() we don't allow to signal processes through O_PATH file descriptors since it is semantically equivalent to a write on the pidfd. We already correctly error out right now and return EBADF if an O_PATH fd is passed. This is because we use file->f_op to detect whether a pidfd is passed and O_PATH fds have their file->f_op set to empty_fops in do_dentry_open() and thus fail the test. Thus, there is no regression. It's just semantically correct to use fdget() and return an error right from there instead of taking a reference and returning an error later. Signed-off-by: Christian Brauner <christian@brauner.io> Acked-by: Oleg Nesterov <oleg@redhat.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Kees Cook <keescook@chromium.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jann Horn <jann@thejh.net> Cc: David Howells <dhowells@redhat.com> Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com> Cc: Andy Lutomirsky <luto@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Aleksa Sarai <cyphar@cyphar.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: 738a7832d21e3d911fcddab98ce260b79010b461 authored by Christian Brauner on 18 April 2019, 10:18:39 UTC
signal: use fdget() since we don't allow O_PATH
signal: use fdget() since we don't allow O_PATH
Tip revision: 738a783
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Kconfig | -rw-r--r-- | 3.7 KB |
Makefile | -rw-r--r-- | 5.3 KB |
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