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[122.61.176.117]) by smtp.gmail.com with ESMTPSA id v7sm15026156pfu.39.2021.08.07.19.54.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 07 Aug 2021 19:54:19 -0700 (PDT) Cc: mtk.manpages@gmail.com, Kir Kolyshkin , linux-man@vger.kernel.org Subject: Re: [PATCH 14/32] capabilities.7, user_namespaces.7: describe CAP_SETFCAP To: Alejandro Colomar References: <20210728202008.3158-1-alx.manpages@gmail.com> <20210728202008.3158-15-alx.manpages@gmail.com> From: "Michael Kerrisk (man-pages)" Message-ID: Date: Sun, 8 Aug 2021 04:54:14 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20210728202008.3158-15-alx.manpages@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 Hello Kir, Alex, On 7/28/21 10:19 PM, Alejandro Colomar wrote: > From: Kir Kolyshkin > > Signed-off-by: Kir Kolyshkin > Signed-off-by: Alejandro Colomar > --- > man7/capabilities.7 | 6 ++++++ > man7/user_namespaces.7 | 6 ++++++ > 2 files changed, 12 insertions(+) > > diff --git a/man7/capabilities.7 b/man7/capabilities.7 > index 9f8f0087f..2f9c9a61e 100644 > --- a/man7/capabilities.7 > +++ b/man7/capabilities.7 > @@ -349,6 +349,12 @@ write a group ID mapping in a user namespace (see > .TP > .BR CAP_SETFCAP " (since Linux 2.6.24)" > Set arbitrary capabilities on a file. > +.IP > +.\" commit db2e718a47984b9d71ed890eb2ea36ecf150de18 Thank you for including the commit; that's always really helpful! > +Since Linux 5.12, this capability is > +also needed to map uid 0 (as in > +.BR unshare\ -Ur , > +.RB see unshare (1). > .TP > .B CAP_SETPCAP > If file capabilities are supported (i.e., since Linux 2.6.24): > diff --git a/man7/user_namespaces.7 b/man7/user_namespaces.7 > index 518e7a3bb..3378b6057 100644 > --- a/man7/user_namespaces.7 > +++ b/man7/user_namespaces.7 > @@ -577,6 +577,12 @@ or be in the parent user namespace of the process > The mapped user IDs (group IDs) must in turn have a mapping > in the parent user namespace. > .IP 4. > +.\" commit db2e718a47984b9d71ed890eb2ea36ecf150de18 > +If a writing process is root (i.e. UID 0) trying to map host user ID 0, > +it must have > +.B CAP_SETFCAP > +capability (since Linux 5.12). > +.IP 5. > One of the following two cases applies: > .RS > .IP * 3 Thanks for the patch. I've applied. Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/