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Remove references to pdwait4(2) and CAP_PDWAIT from rights(4)

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@cem removed references to pdwait4(2) (a nonexistent syscall) in
r320058.

This change removes references to pdwait4(2) and `CAP_PDWAIT` in
rights(4) to not mislead the user into thinking that pdwait4(2)/`CAP_PDWAIT` is
actually implemented in the stock FreeBSD kernel.

The goal of this functionality was to simplify monitoring/manipulating
processes started with `pdfork`, et al, and avoid races with waiting on pids.
The syscall was never completed though--just discussed on the capsicum mailing
list back in 2015:
https://lists.cam.ac.uk/pipermail/cl-capsicum-discuss/2015-May/msg00012.html
. That being said, there are members of the project (@rwatson, etc) who
have longterm goals to implement this syscall to better secure pdfork(2)
calls.

PR:		235871
Reviewed by:	emaste
Discussed with:	rwatson
Approved by:	emaste (mentor)
MFC after:	1 week
Differential Revision: https://reviews.freebsd.org/D18950
This commit is contained in:
Enji Cooper 2019-02-28 18:12:14 +00:00
parent 8ebb14b1c6
commit 1ece6232d2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=344662
2 changed files with 7 additions and 5 deletions
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5
share/man/man4/rights.4
View File

@ -32,7 +32,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd April 30, 2018
.Dd February 28, 2019
.Dt RIGHTS 4
.Os
.Sh NAME
@ -467,9 +467,6 @@ Permit
.It Dv CAP_PDKILL
Permit
.Xr pdkill 2 .
.It Dv CAP_PDWAIT
Permit
.Xr pdwait4 2 .
.It Dv CAP_PEELOFF
Permit
.Xr sctp_peeloff 2 .

7
sys/sys/capsicum.h
View File

@ -246,7 +246,12 @@
/* Process management via process descriptors. */
/* Allows for pdgetpid(2). */
#define CAP_PDGETPID CAPRIGHT(1, 0x0000000000000200ULL)
/* Allows for pdwait4(2). */
/*
* Allows for pdwait4(2).
*
* XXX: this constant was imported unused, but is targeted to be implemented
* in the future (bug 235871).
*/
#define CAP_PDWAIT CAPRIGHT(1, 0x0000000000000400ULL)
/* Allows for pdkill(2). */
#define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL)