d6842bf18d
user_namespaces.7: srcfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
627e4074b4
user_namespaces.7: Fix description of inheritance of capabilities across nested namespaces
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Based on input from Eric Biederman
Calling cap_capable asks: Does the current process have
capability X in userns U.
I see three ways you can have that capability.
1) The current process can be in user namespace U and directly
have capability X.
2) The current process can be in the parent of namespace U and
its euid can be the euid that created user namespace U.
3) You can have be have the capability X in a user namespace
that is an ancestor of U.
Coming from the direction of your manpage text.
With respect to capabilities, the following rules apply to
nested user namespaces.
1. If a process has a capability in a user namespace has that
capability in all descendant user namespaces as well.
2. The user that creates a user namespace while in the parent
namespace has all capabilities in the created namespace
and in all descendent user namespaces.
So having said that part of my problem with your original
text is that it actually switches directions. One one rule
it is looking into the descendent user namespaces, and in the
other rule it is looking at ancestor user namespaces.
So perhaps the text should read:
With respect to capabilities, the following rules are used to
answer the question does a process P have a capability C in a
user namespace U.
1. P has the capability C if P is in user namespace U and
capability C is in process P's capability set.
2. P has the capability C if P is in the parent of user
namespace U and the euid of P is the euid that created user
namespace U.
3. P has the capability C if P has the capability C in some
user namespace V that is an ancestor of U.
Which probably gets a little extra mathematical, but it is
precise.
Reported-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
7ae693d017
user_namespaces.7: wfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
03611be8d7
user_namespaces.7: Add some references to other pages
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
6c3db75479
pid_namespaces.7: readlink(2) on /proc/self gives the caller's PID in the pidns of /proc
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
6e377abf9c
pid_namespaces.7: Parent process relationships mirror parent PID namespace relationships
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
7a9ab60197
pid_namespaces.7: srcfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
546fb4eefe
pid_namespaces.7: Rewrite discussion of nested PID namespaces
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
4085d4cde3
pid_namespaces.7: srcfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:16:00 -07:00
963e117faf
pid_namespaces.7: Minor wording fix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
84030779d2
pid_namespaces.7: Reorganize and add some subheadings
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
7e0e902b55
clone.2, getpid.2, credentials.7: Replace reference to namespaces(7) with pid_namespaces(7)
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
024d6a8449
namespaces.7: Remove PID namespaces material shifted to pid_namespaces(7)
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
a79bacf5f1
pid_namespaces.7: New page splitting PID namespace material out of namespaces(7)
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
f58fb24f16
clone.2, seteuid.2, setgid.2, setresuid.2, setreuid.2, setuid.2, unshare.2, capabilities.7, credentials.7: Change reference to namespaces(7) to user_namespaces(7)
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
62a5214c57
user_namespaces.7: Reorganize and add some subheadings
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
67d1131fd9
namespaces.7: Remove userns material shifted to user_namespaces(7)
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The user namespaces section was getting long and unwieldy.
Split it into its own page, so that it can be better
structured with subtitles, etc.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
046de6a7d7
user_namespaces.7: New page splitting user namespace material out of namespaces(7)
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
9552196ecb
namespaces.7: ffix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
e67b117c39
namespaces.7: Document association between userns and other namespace types
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
16fe718f99
setns.2: wfix
2014-09-13 20:15:59 -07:00
e57c3979fe
setns.2: wfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
ec66fbfff5
setns.2: Reorganize text on user namespaces
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And add reference to user_namespaces(7).
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
5c8d010b84
setns.2, unshare.2: Add reference to pid_namespaces(7)
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
5c67baab4f
setns.2: tfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
7fc8e5ece2
setns.2: wfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
edc3c3b4c0
setns.2: Attempt to rejoin current user namespace gives EINVAL
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
365d292a3c
clone.2, unshare.2, namespaces.7: clone() and unshare() fail (EPERM) if caller's UID/GID are not mapped
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
1d5adb6f9e
namespaces.7: Userns creation associates eff. GID of creator with the userns
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
5eb7f09d7c
namespaces.7: Move text on capabilities in user namespaces
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
7f76dc3079
namespaces.7: tfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
cda377d2bc
namespaces.7: Clarify use of 'single line' case when writing userns map files
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
e2eb61370e
namespaces.7: Note rules regarding capabilities and nested namespaces
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
9a80f81d04
namespaces.7: Clarify explanation of nested user namespaces
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
6be09bd882
namespaces.7: srcfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
fd4eb520d6
namespaces.7: srcfix: Added FIXME
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
aa49742066
namespaces.7: Mapping files are empty when a user namespace is first created
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
b87dd2afb0
namespaces.7: User namespace ID mappings can be defined via any member process's map
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
b2e73e0ce8
namespaces.7: Clarify max # of bytes that can be written to a user namespace map
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
3fe8d14797
namespaces.7: Describe semantics of set-user/group-ID programs in a user namespace
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:59 -07:00
e420879421
namespaces.7: Rewrite EPERM rules for writing to user namespace map file
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
1879c18c63
namespaces.7: spfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
d70ee6ff45
namespaces.7: wfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
6155c4554f
namespaces.7: wfix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
4d2d9a106f
namespaces.7: Add further EINVAL cases for writes to userspace map files
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
0076479cdd
seteuid.2, setgid.2, setresuid.2, setreuid.2, setuid.2: EINVAL can occur if UID/GID is not valid in caller's user namespace
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Also add namespaces(7) under SEE ALSO.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
8e5924c0a9
namespaces.7: Clarify a detail in permissions for writing to user namespace map files
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
cfc50babe7
namespaces.7: Violating rules for writing to user namespace map file yields EPERM
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
ed0ce71a31
namespaces.7: ffix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
76f89cbea4
namespaces.7: ffix
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Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
2014-09-13 20:15:58 -07:00
Michael Kerrisk