Граф коммитов

44 Коммитов

Автор SHA1 Сообщение Дата
Jonathon Reinhart 31c4d2f160 net: Ensure net namespace isolation of sysctls
This adds an ensure_safe_net_sysctl() check during register_net_sysctl()
to validate that sysctl table entries for a non-init_net netns are
sufficiently isolated. To be netns-safe, an entry must adhere to at
least (and usually exactly) one of these rules:

1. It is marked read-only inside the netns.
2. Its data pointer does not point to kernel/module global data.

An entry which fails both of these checks is indicative of a bug,
whereby a child netns can affect global net sysctl values.

If such an entry is found, this code will issue a warning to the kernel
log, and force the entry to be read-only to prevent a leak.

To test, simply create a new netns:

    $ sudo ip netns add dummy

As it sits now, this patch will WARN for two sysctls which will be
addressed in a subsequent patch:
- /proc/sys/net/netfilter/nf_conntrack_max
- /proc/sys/net/netfilter/nf_conntrack_expect_max

Signed-off-by: Jonathon Reinhart <Jonathon.Reinhart@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2021-04-12 13:27:11 -07:00
Thomas Gleixner 457c899653 treewide: Add SPDX license identifier for missed files
Add SPDX license identifiers to all files which:

 - Have no license information of any form

 - Have EXPORT_.*_SYMBOL_GPL inside which was used in the
   initial scan/conversion to ignore the file

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21 10:50:45 +02:00
Eric W. Biederman b54807fa52 sysctl: Remove dead register_sysctl_root
The function no longer does anything.  The is only a single caller of
register_sysctl_root when semantically there should be two.  Remove
this function so that if someone decides this functionality is needed
again it will be obvious all of the callers of setup_sysctl_set need
to be audited and modified appropriately.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2017-04-16 23:42:49 -05:00
Linus Torvalds 14986a34e1 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
Pull namespace updates from Eric Biederman:
 "This set of changes is a number of smaller things that have been
  overlooked in other development cycles focused on more fundamental
  change. The devpts changes are small things that were a distraction
  until we managed to kill off DEVPTS_MULTPLE_INSTANCES. There is an
  trivial regression fix to autofs for the unprivileged mount changes
  that went in last cycle. A pair of ioctls has been added by Andrey
  Vagin making it is possible to discover the relationships between
  namespaces when referring to them through file descriptors.

  The big user visible change is starting to add simple resource limits
  to catch programs that misbehave. With namespaces in general and user
  namespaces in particular allowing users to use more kinds of
  resources, it has become important to have something to limit errant
  programs. Because the purpose of these limits is to catch errant
  programs the code needs to be inexpensive to use as it always on, and
  the default limits need to be high enough that well behaved programs
  on well behaved systems don't encounter them.

  To this end, after some review I have implemented per user per user
  namespace limits, and use them to limit the number of namespaces. The
  limits being per user mean that one user can not exhause the limits of
  another user. The limits being per user namespace allow contexts where
  the limit is 0 and security conscious folks can remove from their
  threat anlysis the code used to manage namespaces (as they have
  historically done as it root only). At the same time the limits being
  per user namespace allow other parts of the system to use namespaces.

  Namespaces are increasingly being used in application sand boxing
  scenarios so an all or nothing disable for the entire system for the
  security conscious folks makes increasing use of these sandboxes
  impossible.

  There is also added a limit on the maximum number of mounts present in
  a single mount namespace. It is nontrivial to guess what a reasonable
  system wide limit on the number of mount structure in the kernel would
  be, especially as it various based on how a system is using
  containers. A limit on the number of mounts in a mount namespace
  however is much easier to understand and set. In most cases in
  practice only about 1000 mounts are used. Given that some autofs
  scenarious have the potential to be 30,000 to 50,000 mounts I have set
  the default limit for the number of mounts at 100,000 which is well
  above every known set of users but low enough that the mount hash
  tables don't degrade unreaonsably.

  These limits are a start. I expect this estabilishes a pattern that
  other limits for resources that namespaces use will follow. There has
  been interest in making inotify event limits per user per user
  namespace as well as interest expressed in making details about what
  is going on in the kernel more visible"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (28 commits)
  autofs:  Fix automounts by using current_real_cred()->uid
  mnt: Add a per mount namespace limit on the number of mounts
  netns: move {inc,dec}_net_namespaces into #ifdef
  nsfs: Simplify __ns_get_path
  tools/testing: add a test to check nsfs ioctl-s
  nsfs: add ioctl to get a parent namespace
  nsfs: add ioctl to get an owning user namespace for ns file descriptor
  kernel: add a helper to get an owning user namespace for a namespace
  devpts: Change the owner of /dev/pts/ptmx to the mounter of /dev/pts
  devpts: Remove sync_filesystems
  devpts: Make devpts_kill_sb safe if fsi is NULL
  devpts: Simplify devpts_mount by using mount_nodev
  devpts: Move the creation of /dev/pts/ptmx into fill_super
  devpts: Move parse_mount_options into fill_super
  userns: When the per user per user namespace limit is reached return ENOSPC
  userns; Document per user per user namespace limits.
  mntns: Add a limit on the number of mount namespaces.
  netns: Add a limit on the number of net namespaces
  cgroupns: Add a limit on the number of cgroup namespaces
  ipcns: Add a  limit on the number of ipc namespaces
  ...
2016-10-06 09:52:23 -07:00
Tyler Hicks d6169b0206 net: Use ns_capable_noaudit() when determining net sysctl permissions
The capability check should not be audited since it is only being used
to determine the inode permissions. A failed check does not indicate a
violation of security policy but, when an LSM is enabled, a denial audit
message was being generated.

The denial audit message caused confusion for some application authors
because root-running Go applications always triggered the denial. To
prevent this confusion, the capability check in net_ctl_permissions() is
switched to the noaudit variant.

BugLink: https://launchpad.net/bugs/1465724

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
[dtor: reapplied after e79c6a4fc9 ("net: make net namespace sysctls
belong to container's owner") accidentally reverted the change.]
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-01 03:24:28 -04:00
Dmitry Torokhov e79c6a4fc9 net: make net namespace sysctls belong to container's owner
If net namespace is attached to a user namespace let's make container's
root owner of sysctls affecting said network namespace instead of global
root.

This also allows us to clean up net_ctl_permissions() because we do not
need to fudge permissions anymore for the container's owner since it now
owns the objects in question.

Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-08-14 21:08:58 -07:00
Eric W. Biederman 13bcc6a285 sysctl: Stop implicitly passing current into sysctl_table_root.lookup
Passing nsproxy into sysctl_table_root.lookup was a premature
optimization in attempt to avoid depending on current.  The
directory /proc/self/sys has not appeared and if and when
it does this code will need to be reviewed closely and reworked
anyway.  So remove the premature optimization.

Acked-by: Kees Cook <keescook@chromium.org>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2016-08-08 09:17:16 -05:00
Tyler Hicks d6e0d30644 net: Use ns_capable_noaudit() when determining net sysctl permissions
The capability check should not be audited since it is only being used
to determine the inode permissions. A failed check does not indicate a
violation of security policy but, when an LSM is enabled, a denial audit
message was being generated.

The denial audit message caused confusion for some application authors
because root-running Go applications always triggered the denial. To
prevent this confusion, the capability check in net_ctl_permissions() is
switched to the noaudit variant.

BugLink: https://launchpad.net/bugs/1465724

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
2016-06-06 20:16:22 +10:00
Li RongQing ce9d9b8e5c net: sysctl: fix a kmemleak warning
the returned buffer of register_sysctl() is stored into net_header
variable, but net_header is not used after, and compiler maybe
optimise the variable out, and lead kmemleak reported the below warning

	comm "swapper/0", pid 1, jiffies 4294937448 (age 267.270s)
	hex dump (first 32 bytes):
	90 38 8b 01 c0 ff ff ff 00 00 00 00 01 00 00 00 .8..............
	01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
	backtrace:
	[<ffffffc00020f134>] create_object+0x10c/0x2a0
	[<ffffffc00070ff44>] kmemleak_alloc+0x54/0xa0
	[<ffffffc0001fe378>] __kmalloc+0x1f8/0x4f8
	[<ffffffc00028e984>] __register_sysctl_table+0x64/0x5a0
	[<ffffffc00028eef0>] register_sysctl+0x30/0x40
	[<ffffffc00099c304>] net_sysctl_init+0x20/0x58
	[<ffffffc000994dd8>] sock_init+0x10/0xb0
	[<ffffffc0000842e0>] do_one_initcall+0x90/0x1b8
	[<ffffffc000966bac>] kernel_init_freeable+0x218/0x2f0
	[<ffffffc00070ed6c>] kernel_init+0x1c/0xe8
	[<ffffffc000083bfc>] ret_from_fork+0xc/0x50
	[<ffffffffffffffff>] 0xffffffffffffffff <<end check kmemleak>>

Before fix, the objdump result on ARM64:
0000000000000000 <net_sysctl_init>:
   0:   a9be7bfd        stp     x29, x30, [sp,#-32]!
   4:   90000001        adrp    x1, 0 <net_sysctl_init>
   8:   90000000        adrp    x0, 0 <net_sysctl_init>
   c:   910003fd        mov     x29, sp
  10:   91000021        add     x1, x1, #0x0
  14:   91000000        add     x0, x0, #0x0
  18:   a90153f3        stp     x19, x20, [sp,#16]
  1c:   12800174        mov     w20, #0xfffffff4                // #-12
  20:   94000000        bl      0 <register_sysctl>
  24:   b4000120        cbz     x0, 48 <net_sysctl_init+0x48>
  28:   90000013        adrp    x19, 0 <net_sysctl_init>
  2c:   91000273        add     x19, x19, #0x0
  30:   9101a260        add     x0, x19, #0x68
  34:   94000000        bl      0 <register_pernet_subsys>
  38:   2a0003f4        mov     w20, w0
  3c:   35000060        cbnz    w0, 48 <net_sysctl_init+0x48>
  40:   aa1303e0        mov     x0, x19
  44:   94000000        bl      0 <register_sysctl_root>
  48:   2a1403e0        mov     w0, w20
  4c:   a94153f3        ldp     x19, x20, [sp,#16]
  50:   a8c27bfd        ldp     x29, x30, [sp],#32
  54:   d65f03c0        ret
After:
0000000000000000 <net_sysctl_init>:
   0:   a9bd7bfd        stp     x29, x30, [sp,#-48]!
   4:   90000000        adrp    x0, 0 <net_sysctl_init>
   8:   910003fd        mov     x29, sp
   c:   a90153f3        stp     x19, x20, [sp,#16]
  10:   90000013        adrp    x19, 0 <net_sysctl_init>
  14:   91000000        add     x0, x0, #0x0
  18:   91000273        add     x19, x19, #0x0
  1c:   f90013f5        str     x21, [sp,#32]
  20:   aa1303e1        mov     x1, x19
  24:   12800175        mov     w21, #0xfffffff4                // #-12
  28:   94000000        bl      0 <register_sysctl>
  2c:   f9002260        str     x0, [x19,#64]
  30:   b40001a0        cbz     x0, 64 <net_sysctl_init+0x64>
  34:   90000014        adrp    x20, 0 <net_sysctl_init>
  38:   91000294        add     x20, x20, #0x0
  3c:   9101a280        add     x0, x20, #0x68
  40:   94000000        bl      0 <register_pernet_subsys>
  44:   2a0003f5        mov     w21, w0
  48:   35000080        cbnz    w0, 58 <net_sysctl_init+0x58>
  4c:   aa1403e0        mov     x0, x20
  50:   94000000        bl      0 <register_sysctl_root>
  54:   14000004        b       64 <net_sysctl_init+0x64>
  58:   f9402260        ldr     x0, [x19,#64]
  5c:   94000000        bl      0 <unregister_sysctl_table>
  60:   f900227f        str     xzr, [x19,#64]
  64:   2a1503e0        mov     w0, w21
  68:   f94013f5        ldr     x21, [sp,#32]
  6c:   a94153f3        ldp     x19, x20, [sp,#16]
  70:   a8c37bfd        ldp     x29, x30, [sp],#48
  74:   d65f03c0        ret

Add the possible error handle to free the net_header to remove the
kmemleak warning

Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-10-23 06:22:08 -07:00
Eric W. Biederman 2433c8f094 net: Update the sysctl permissions handler to test effective uid/gid
Modify the code to use current_euid(), and in_egroup_p, as in done
in fs/proc/proc_sysctl.c:test_perm()

Cc: stable@vger.kernel.org
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-10-06 13:50:14 -07:00
Zhao Hongjiang 86937c05cb user_ns: get rid of duplicate code in net_ctl_permissions
Get rid of duplicate code in net_ctl_permissions and fix the comment.

Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-18 20:32:45 -05:00
Eric W. Biederman cff109768b net: Update the per network namespace sysctls to be available to the network namespace owner
- Allow anyone with CAP_NET_ADMIN rights in the user namespace of the
  the netowrk namespace to change sysctls.
- Allow anyone the uid of the user namespace root the same
  permissions over the network namespace sysctls as the global root.
- Allow anyone with gid of the user namespace root group the same
  permissions over the network namespace sysctl as the global root group.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-18 20:32:45 -05:00
Eric W. Biederman 73f7ef4359 sysctl: Pass useful parameters to sysctl permissions
- Current is implicitly avaiable so passing current->nsproxy isn't useful.
- The ctl_table_header is needed to find how the sysctl table is connected
  to the rest of sysctl.
- ctl_table_root is avaiable in the ctl_table_header so no need to it.

With these changes it becomes possible to write a version of
net_sysctl_permission that takes into account the network namespace of
the sysctl table, an important feature in extending the user namespace.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-18 20:30:55 -05:00
Paul Gortmaker 211ed86510 net: delete all instances of special processing for token ring
We are going to delete the Token ring support.  This removes any
special processing in the core networking for token ring, (aside
from net/tr.c itself), leaving the drivers and remaining tokenring
support present but inert.

The mass removal of the drivers and net/tr.c will be in a separate
commit, so that the history of these files that we still care
about won't have the giant deletion tied into their history.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2012-05-15 20:14:35 -04:00
Eric W. Biederman 5f568e5afe net: Remove register_net_sysctl_table
All of the users have been converted to use registera_net_sysctl so we
no longer need register_net_sysctl.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-20 21:22:30 -04:00
Eric W. Biederman 4344475797 net: Kill register_sysctl_rotable
register_sysctl_rotable never caught on as an interesting way to
register sysctls.  My take on the situation is that what we want are
sysctls that we can only see in the initial network namespace.  What we
have implemented with register_sysctl_rotable are sysctls that we can
see in all of the network namespaces and can only change in the initial
network namespace.

That is a very silly way to go.  Just register the network sysctls
in the initial network namespace and we don't have any weird special
cases to deal with.

The sysctls affected are:
/proc/sys/net/ipv4/ipfrag_secret_interval
/proc/sys/net/ipv4/ipfrag_max_dist
/proc/sys/net/ipv6/ip6frag_secret_interval
/proc/sys/net/ipv6/mld_max_msf

I really don't expect anyone will miss them if they can't read them in a
child user namespace.

CC: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-20 21:21:17 -04:00
Eric W. Biederman 2ca794e5e8 net sysctl: Initialize the network sysctls sooner to avoid problems.
If the netfilter code is modified to use register_net_sysctl_table the
kernel fails to boot because the per net sysctl infrasturce is not setup
soon enough.  So to avoid races call net_sysctl_init from sock_init().

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-20 21:21:16 -04:00
Eric W. Biederman bc8a36942a net sysctl: Register an empty /proc/sys/net
Implementation limitations of the sysctl core won't let /proc/sys/net
reside in a network namespace.  /proc/sys/net at least must be registered
as a normal sysctl.  So register /proc/sys/net early as an empty directory
to guarantee we don't violate this constraint and hit bugs in the sysctl
implementation.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-20 21:21:16 -04:00
Eric W. Biederman ab41a2ca50 net: Implement register_net_sysctl.
Right now all of the networking sysctl registrations are running in a
compatibiity mode.  The natvie sysctl registration api takes a cstring
for a path and a simple ctl_table.  Implement register_net_sysctl so
that we can register network sysctls without needing to use
compatiblity code in the sysctl core.

Switching from a ctl_path to a cstring results in less boiler plate
and denser code that is a little easier to read.

I would simply have changed the arguments to register_net_sysctl_table
instead of keeping two functions in parallel but gcc will allow a
ctl_path pointer to be passed to a char * pointer with only issuing a
warning resulting in completely incorrect code can be built.  Since I
have to change the function name I am taking advantage of the situation
to let both register_net_sysctl and register_net_sysctl_table live for a
short time in parallel which makes clean conversion patches a bit easier
to read and write.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-04-20 21:21:15 -04:00
Eric W. Biederman 60a47a2e82 sysctl: Modify __register_sysctl_paths to take a set instead of a root and an nsproxy
An nsproxy argument here has always been awkard and now the nsproxy argument
is completely unnecessary so remove it, replacing it with the set we want
the registered tables to show up in.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-01-24 16:40:30 -08:00
Eric W. Biederman 9eb47c26f0 sysctl: Add a root pointer to ctl_table_set
Add a ctl_table_root pointer to ctl_table set so it is easy to
go from a ctl_table_set to a ctl_table_root.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-01-24 16:40:29 -08:00
Eric W. Biederman bd295b56cf sysctl: Remove the unnecessary sysctl_set parent concept.
In sysctl_net register the two networking roots in the proper order.

In register_sysctl walk the sysctl sets in the reverse order of the
sysctl roots.

Remove parent from ctl_table_set and setup_sysctl_set as it is no
longer needed.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-01-24 16:37:55 -08:00
Eric W. Biederman 97324cd804 sysctl: Implement retire_sysctl_set
This adds a small helper retire_sysctl_set to remove the intimate knowledge about
the how a sysctl_set is implemented from net/sysct_net.c

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-01-24 16:37:55 -08:00
Eric W. Biederman de4e83bd6b sysctl: Register the base sysctl table like any other sysctl table.
Simplify the code by treating the base sysctl table like any other
sysctl table and register it with register_sysctl_table.

To ensure this table is registered early enough to avoid problems
call sysctl_init from proc_sys_init.

Rename sysctl_net.c:sysctl_init() to net_sysctl_init() to avoid
name conflicts now that kernel/sysctl.c:sysctl_init() is no longer
static.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2012-01-24 16:37:54 -08:00
Paul Gortmaker bc3b2d7fb9 net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules
These files are non modular, but need to export symbols using
the macros now living in export.h -- call out the include so
that things won't break when we remove the implicit presence
of module.h from everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:30:30 -04:00
Joe Perches 3fa21e07e6 net: Remove unnecessary returns from void function()s
This patch removes from net/ (but not any netfilter files)
all the unnecessary return; statements that precede the
last closing brace of void functions.

It does not remove the returns that are immediately
preceded by a label as gcc doesn't like that.

Done via:
$ grep -rP --include=*.[ch] -l "return;\n}" net/ | \
  xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }'

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17 23:23:14 -07:00
Alexey Dobriyan 2c8c1e7297 net: spread __net_init, __net_exit
__net_init/__net_exit are apparently not going away, so use them
to full extent.

In some cases __net_init was removed, because it was called from
__net_exit code.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-01-17 19:16:02 -08:00
Cyrill Gorcunov 81a1d3c31e net: sysctl_net - use net_eq to compare nets
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Daniel Lezcano <daniel.lezcano@free.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
2009-03-16 16:23:30 +01:00
Al Viro eeb61f719c missing bits of net-namespace / sysctl
Piss-poor sysctl registration API strikes again, film at 11...

What we really need is _pathname_ required to be present in already
registered table, so that kernel could warn about bad order.  That's the
next target for sysctl stuff (and generally saner and more explicit
order of initialization of ipv[46] internals wouldn't hurt either).

For the time being, here are full fixups required by ..._rotable()
stuff; we make per-net sysctl sets descendents of "ro" one and make sure
that sufficient skeleton is there before we start registering per-net
sysctls.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-27 09:45:34 -07:00
Al Viro 734550921e [PATCH] beginning of sysctl cleanup - ctl_table_set
New object: set of sysctls [currently - root and per-net-ns].
Contains: pointer to parent set, list of tables and "should I see this set?"
method (->is_seen(set)).
Current lists of tables are subsumed by that; net-ns contains such a beast.
->lookup() for ctl_table_root returns pointer to ctl_table_set instead of
that to ->list of that ctl_table_set.

[folded compile fixes by rdd for configs without sysctl]

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2008-07-26 20:53:08 -04:00
Stephen Hemminger 4ecb90090c sysctl: allow override of /proc/sys/net with CAP_NET_ADMIN
Extend the permission check for networking sysctl's to allow modification
when current process has CAP_NET_ADMIN capability and is not root.  This
version uses the until now unused permissions hook to override the mode
value for /proc/sys/net if accessed by a user with capabilities.

Found while working with Quagga.  It is impossible to turn forwarding
on/off through the command interface because Quagga uses secure coding
practice of dropping privledges during initialization and only raising via
capabilities when necessary.  Since the dameon has reset real/effective
uid after initialization, all attempts to access /proc/sys/net variables
will fail.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Chris Wright <chrisw@sous-sol.org>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrew Morgan <morgan@kernel.org>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-07-25 10:53:45 -07:00
Adrian Bunk 0b04082995 net: remove CVS keywords
This patch removes CVS keywords that weren't updated for a long time
from comments.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-06-11 21:00:38 -07:00
Pavel Emelyanov d62c612ef8 netns: Introduce sysctl root for read-only net sysctls.
This one stores all ctl-heads in one list and restricts the
permissions not give write access to non-init net namespaces.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-19 13:45:33 -07:00
Harvey Harrison ab59859de1 net: fix returning void-valued expression warnings
drivers/net/8390.c:37:2: warning: returning void-valued expression
drivers/net/bnx2.c:1635:3: warning: returning void-valued expression
drivers/net/xen-netfront.c:1806:2: warning: returning void-valued expression
net/ipv4/tcp_hybla.c:105:3: warning: returning void-valued expression
net/ipv4/tcp_vegas.c:171:3: warning: returning void-valued expression
net/ipv4/tcp_veno.c:123:3: warning: returning void-valued expression
net/sysctl_net.c:85:2: warning: returning void-valued expression

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-05-01 02:47:38 -07:00
Pavel Emelyanov 08913681e4 [NET]: Remove the empty net_table
I have removed all the entries from this table (core_table,
ipv4_table and tr_table), so now we can safely drop it.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:56:29 -08:00
Pavel Emelyanov 36f0bebd98 [TR]: Use ctl paths to register net/token-ring/ table
The same thing for token-ring - use ctl paths and get
rid of external references on the tr_table.

Unfortunately, I couldn't split this patch into cleanup and
use-the-paths parts.

As a lame excuse I can say, that the cleanup is just moving
the tr_table from one file to another - closet to a single
variable, that this ctl table tunes. Since the source  file
becomes empty after the move, I remove it.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:56:28 -08:00
Pavel Emelyanov 3e37c3f997 [IPV4]: Use ctl paths to register net/ipv4/ table
This is the same as I did for the net/core/ table in the
second patch in his series: use the paths and isolate the
whole table in the .c file.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:56:27 -08:00
Pavel Emelyanov 33eb9cfc70 [NET]: Isolate the net/core/ sysctl table
Using ctl paths we can put all the stuff, related to net/core/
sysctl table, into one file and remove all the references on it.

As a good side effect this hides the "core_table" name from
the global scope :)

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:56:26 -08:00
Eric W. Biederman 95bdfccb2b [NET]: Implement the per network namespace sysctl infrastructure
The user interface is: register_net_sysctl_table and
unregister_net_sysctl_table.  Very much like the current
interface except there is a network namespace parameter.

With this any sysctl registered with register_net_sysctl_table
will only show up to tasks in the same network namespace.

All other sysctls continue to be globally visible.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Daniel Lezcano <dlezcano@fr.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-01-28 14:55:18 -08:00
Jörn Engel 6ab3d5624e Remove obsolete #include <linux/config.h>
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30 19:25:36 +02:00
Jes Sorensen 6569a351da [NET]: Eliminate unused /proc/sys/net/ethernet
The /proc/sys/net/ethernet directory has been sitting empty for more than
10 years!  Time to eliminate it!

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-05 15:34:11 -07:00
Russell King 496a22b08f [NET]: Fix "sysctl_net.c:36: error: 'core_table' undeclared here"
During the build for ARM machine type "fortunet", this error occurred:

  CC      net/sysctl_net.o
net/sysctl_net.c:36: error: 'core_table' undeclared here (not in a function)

It appears that the following configuration settings cause this error
due to a missing include:
CONFIG_SYSCTL=y
CONFIG_NET=y
# CONFIG_INET is not set

core_table appears to be declared in net/sock.h.  if CONFIG_INET were
defined, net/sock.h would have been included via:
  sysctl_net.c -> net/ip.h -> linux/ip.h -> net/sock.h

so include it directly.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-10-03 14:16:34 -07:00
Arnaldo Carvalho de Melo 20380731bc [NET]: Fix sparse warnings
Of this type, mostly:

CHECK   net/ipv6/netfilter.c
net/ipv6/netfilter.c:96:12: warning: symbol 'ipv6_netfilter_init' was not declared. Should it be static?
net/ipv6/netfilter.c:101:6: warning: symbol 'ipv6_netfilter_fini' was not declared. Should it be static?

Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 16:01:32 -07:00
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00