[PATCHv2 manpages] getgroups.2: Document unprivileged setgroups calls

[Josh Triplett]

Signed-off-by: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
---
v2: Document requirement for no_new_privs.

(If this doesn't end up going into 3.18, the version number in the patch will
need updating.)

 man2/getgroups.2 | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/man2/getgroups.2 b/man2/getgroups.2
index 373c204..3f3d330 100644
--- a/man2/getgroups.2
+++ b/man2/getgroups.2
@@ -81,9 +81,11 @@ to be used in a further call to
 .PP
 .BR setgroups ()
 sets the supplementary group IDs for the calling process.
-Appropriate privileges (Linux: the
+As of Linux 3.18, any process that has enabled PR_SET_NO_NEW_PRIVS may drop
+supplementary groups, but may not add new groups. Adding groups, or making any
+change at all without no_new_privs enabled, requires the
 .B CAP_SETGID
-capability) are required.
+capability.
 The
 .I size
 argument specifies the number of supplementary group IDs
-- 
2.1.3

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