Re: [PATCH 09/15] clone.2: ERRORS: Add EACCESS with CLONE_INTO_CGROUP + clone3
From: Alejandro Colomar (man-pages) <hidden>
Date: 2021-09-10 22:53:21
Hi Michael, On 9/11/21 12:47 AM, Alejandro Colomar wrote:
[Andrew]: I noticed that clone3 can send the EACCES errno after I wrote a program that used clone3 with the CLONE_INTO_CGROUP flag. To me, it's important to know what kind of failure occurred if the clone3() fails, so I was glad that a unique errno is set for this case, but it wasn't documented on the clone man page. [Christian]: In essence, any error that could occur during regular fs-based migration at write-time can also occur during CLONE_INTO_CGROUP. The clone3() manpage just has the inverse of that above statement: "Note that all of the usual restrictions (described in cgroups(7)) on placing a process into a version 2 cgroup apply." Reported-by: Andrew Wock <redacted> Acked-by: Christian Brauner <redacted> Signed-off-by: Alejandro Colomar <redacted>
I forgot to fix the author of the commit. It should be Andrew, as he provided the diff, eventhough I commited it. Please fix that. Thanks, Alex
quoted hunk ↗ jump to hunk
--- man2/clone.2 | 10 ++++++++++ 1 file changed, 10 insertions(+)diff --git a/man2/clone.2 b/man2/clone.2 index e381da165..90db92ad6 100644 --- a/man2/clone.2 +++ b/man2/clone.2@@ -1209,6 +1209,16 @@ in the caller's context, no child process is created, and is set to indicate the error. .SH ERRORS .TP +.BR EACCES " (" clone3 "() only)" +.B CLONE_INTO_CGROUP +was specified in +.IR cl_args.flags , +but the restrictions (described in +.BR cgroups (7)) +on placing the child process into the version 2 cgroup referred to by +.I cl_args.cgroup +are not met. +.TP .B EAGAIN Too many processes are already running; see .BR fork (2).
-- Alejandro Colomar Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/ http://www.alejandro-colomar.es/