From: Topi Miettinen <toiwoton@gmail.com>
To: linux-man@vger.kernel.org, alx.manpages@gmail.com,
mtk.manpages@gmail.com
Cc: selinux@vger.kernel.org, Topi Miettinen <toiwoton@gmail.com>
Subject: [patch] mount.2: document SELinux use of MS_NOSUID mount flag
Date: Sat, 12 Jun 2021 11:51:09 +0300 [thread overview]
Message-ID: <20210612085109.20363-1-toiwoton@gmail.com> (raw)
Using mount flag `MS_NOSUID` also affects SELinux domain transitions but
this has not been documented well.
Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
---
man2/mount.2 | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/man2/mount.2 b/man2/mount.2
index d8521880b..d7d5b2ad4 100644
--- a/man2/mount.2
+++ b/man2/mount.2
@@ -220,7 +220,9 @@ Do not allow programs to be executed from this filesystem.
.TP
.B MS_NOSUID
Do not honor set-user-ID and set-group-ID bits or file capabilities
-when executing programs from this filesystem.
+when executing programs from this filesystem. In addition, SELinux domain
+transitions require permission nosuid_transition, which in turn needs
+also policy capability nnp_nosuid_transition.
.\" (This is a security feature to prevent users executing set-user-ID and
.\" set-group-ID programs from removable disk devices.)
.TP
--
2.30.2
next reply other threads:[~2021-06-12 8:52 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-12 8:51 Topi Miettinen [this message]
2021-06-20 3:54 ` [patch] mount.2: document SELinux use of MS_NOSUID mount flag Michael Kerrisk (man-pages)
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