Re: [PATCH v3 1/2] man/man7/pid_namespaces.7: Fix requirements on namespace+process trees
From: Alejandro Colomar <alx@kernel.org>
Date: 2026-05-13 11:40:42
Hi Matthieu, [CC += linux-man@] (You forgot to CC the list.) On 2026-05-13T10:33:38+0200, Matthieu Buffet wrote:
Creating processes in non-direct-child PID namespaces has been possible since the addition of setns() support for PID namespaces in commit 57e8391d3276 (2012-11-19; "pidns: Add setns support"). The tree check in pidns_install() in kernel/pid_namespace.c has always allowed non-direct-child PID namespaces, but was written inline instead of the more readable current pidns_is_ancestor() helper (possibly explaining the confusion). Fixes: 6e377abf9 (2014-09-13; "pid_namespaces.7: Parent process relationships mirror parent PID namespace relationships") Signed-off-by: Matthieu Buffet <redacted>
Thanks! I've applied the patch. Cheers, Alex
quoted hunk
--- man/man7/pid_namespaces.7 | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)diff --git a/man/man7/pid_namespaces.7 b/man/man7/pid_namespaces.7 index 1068d5be5..b19afd505 100644 --- a/man/man7/pid_namespaces.7 +++ b/man/man7/pid_namespaces.7@@ -214,11 +214,12 @@ and cannot be changed thereafter. Among other things, this means that the parental relationship between processes -mirrors +loosely mirrors the parental relationship between PID namespaces: the parent of a process is either in the same namespace -or resides in the immediate parent PID namespace. +or resides in an ancestor PID namespace +(immediate parent or not). .P A process may call .BR unshare (2)base-commit: 9afc5a7cfa9ecd91db055abb875e3b83d086f6b5 -- 2.47.3
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