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[122.61.176.117]) by smtp.gmail.com with ESMTPSA id y80sm4901208pfb.204.2021.06.19.20.54.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 19 Jun 2021 20:54:46 -0700 (PDT) Cc: mtk.manpages@gmail.com, selinux@vger.kernel.org Subject: Re: [patch] mount.2: document SELinux use of MS_NOSUID mount flag To: Topi Miettinen , linux-man@vger.kernel.org, alx.manpages@gmail.com References: <20210612085109.20363-1-toiwoton@gmail.com> From: "Michael Kerrisk (man-pages)" Message-ID: Date: Sun, 20 Jun 2021 15:54:42 +1200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <20210612085109.20363-1-toiwoton@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-man@vger.kernel.org Helo Topi, On 6/12/21 8:51 PM, Topi Miettinen wrote: > Using mount flag `MS_NOSUID` also affects SELinux domain transitions but > this has not been documented well. > > Signed-off-by: Topi Miettinen Thanks. Patch applied. Cheers, Michael > --- > 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 > -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/