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| author | Mike Frysinger <vapier@gentoo.org> | 2019-09-19 01:43:42 -0400 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2019-09-19 08:37:45 +0200 |
| commit | 5dd76c44497dd43506f79995a8c7f84a105864e4 (patch) | |
| tree | cdf892fb2cee6f1b80e061239268aecbdd430acd | |
| parent | 9914d8bdb832a31992b0c10a0e26980808fd0462 (diff) | |
| download | man-pages-5dd76c44497dd43506f79995a8c7f84a105864e4.tar.gz | |
setns.2: Fix CLONE_NEWNS restriction info
Threads are allowed to switch mount namespaces if the filesystem
details aren't being shared. That's the purpose of the check in
the kernel quoted by the comment:
if (fs->users != 1)
return -EINVAL;
It's been this way since the code was originally merged in v3.8.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man2/setns.2 | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/man2/setns.2 b/man2/setns.2 index 18e8020232..5985c099b4 100644 --- a/man2/setns.2 +++ b/man2/setns.2 @@ -131,8 +131,12 @@ capabilities in its own user namespace and .BR CAP_SYS_ADMIN in the user namespace that owns the target mount namespace. .IP -A process may not be reassociated with a new mount namespace if it is -multithreaded. +A process can't join a new mount namespace if it is sharing +filesystem-related attributes +(the attributes whose sharing is controlled by the +.BR clone (2) +.B CLONE_FS +flag) with another process. .\" Above check is in fs/namespace.c:mntns_install() [3.8 source] .IP See |