Thread (17 messages) flat view 17 messages, 6 authors, 2017-08-11

Re: [RFC 1/1] destroy_creds.2: new page documenting destroy_creds()

From: Andy Lutomirski <hidden>
Date: 2017-08-09 16:08:58
Also in: linux-fsdevel, linux-nfs

On Mon, Aug 7, 2017 at 2:23 PM, Olga Kornievskaia [off-list ref] wrote:
quoted hunk ↗ jump to hunk
destroy_creds() is a new system call for destroying file system
credentials. This is usefulf for file systems that manage its
own security contexts that were bootstrapped via some user land
credentials (such as Kerberos).

Signed-off-by: Olga Kornievskaia <redacted>
---
 man2/destroy_creds.2 | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 man2/destroy_creds.2
diff --git a/man2/destroy_creds.2 b/man2/destroy_creds.2
new file mode 100644
index 0000000..7b41c9d
--- /dev/null
+++ b/man2/destroy_creds.2
@@ -0,0 +1,130 @@
+.\"This manpage is Copyright (C) 2015 Olga Kornievskaia <kolga-ZwjVKphTwtPQT0dZR+AlfA@public.gmane.org>
+.\"
+.\" %%%LICENSE_START(VERBATIM)
+.\" Permission is granted to make and distribute verbatim copies of this
+.\" manual provided the copyright notice and this permission notice are
+.\" preserved on all copies.
+.\"
+.\" Permission is granted to copy and distribute modified versions of
+.\" this manual under the conditions for verbatim copying, provided that
+.\" the entire resulting derived work is distributed under the terms of
+.\" a permission notice identical to this one.
+.\"
+.\" Since the Linux kernel and libraries are constantly changing, this
+.\" manual page may be incorrect or out-of-date.  The author(s) assume
+.\" no responsibility for errors or omissions, or for damages resulting
+.\" from the use of the information contained herein.  The author(s) may
+.\" not have taken the same level of care in the production of this
+.\" manual, which is licensed free of charge, as they might when working
+.\" professionally.
+.\"
+.\" Formatted or processed versions of this manual, if unaccompanied by
+.\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
+.\"
+.TH COPY 2 2017-08-07 "Linux" "Linux Programmer's Manual"
+.SH NAME
+destroy_creds \- destroy current user's file system credentials for a mount point
+.SH SYNOPSIS
+.nf
+.B #include <sys/syscall.h>
+.B #include <unistd.h>
+
+.BI "int destroy_creds(int " fd ");
+.fi
+.SH DESCRIPTION
+The
+.BR destroy ()
+system call performs destruction of file system credentials for the current
+user. It identifies the file system by the supplied file descriptor in
+.I fd
+that represents a mount point.
Does this mean that whatever credentials are used for the current
*fsuid* are destroyed?  Are there actually per-uid credentials in the
first place?

What privileges, if any, are needed to call this?

What if fd points to a bind mount?
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