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Diffstat (limited to 'man/newgidmap.1.xml')
| -rw-r--r-- | man/newgidmap.1.xml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/man/newgidmap.1.xml b/man/newgidmap.1.xml index e4ebc69..e5b770e 100644 --- a/man/newgidmap.1.xml +++ b/man/newgidmap.1.xml @@ -116,6 +116,17 @@ <para> Note that newgidmap may be used only once for a given process. </para> + <para> + Instead of an integer process id, the first argument may be + specified as <replaceable>fd:N</replaceable>, where the integer N + is the file descriptor number for the calling process's opened + file descriptor for the directory <filename>/proc/[pid]</filename>. + In this case, <command>newgidmap</command> will use + <refentrytitle>openat</refentrytitle><manvolnum>2</manvolnum> + to open the <filename>gid_map</filename> file under that + directory, avoiding a TOCTTOU in case the process exits and + the pid is immediately reused. + </para> </refsect1> |