user/sven/linux.git/kernel/utsname.c, branch v3.4.83

kernel: Map most files to use export.h instead of module.h

2011-10-31T13:20:12Z

The changed files were only including linux/module.h for the EXPORT_SYMBOL infrastructure, and nothing else. Revector them onto the isolated export header for faster compile times. Nothing to see here but a whole lot of instances of: -#include +#include This commit is only changing the kernel dir; next targets will probably be mm, fs, the arch dirs, etc. Signed-off-by: Paul Gortmaker

ns proc: Add support for the uts namespace

2011-05-10T21:35:35Z

Acked-by: Daniel Lezcano Signed-off-by: Eric W. Biederman

userns: allow sethostname in a container

2011-03-24T02:47:03Z

Changelog: Feb 23: let clone_uts_ns() handle setting uts->user_ns To do so we need to pass in the task_struct who'll get the utsname, so we can get its user_ns. Feb 23: As per Oleg's coment, just pass in tsk, instead of two of its members. Signed-off-by: Serge E. Hallyn Acked-by: "Eric W. Biederman" Acked-by: Daniel Lezcano Acked-by: David Howells Cc: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

userns: add a user_namespace as creator/owner of uts_namespace

2011-03-24T02:46:59Z

The expected course of development for user namespaces targeted capabilities is laid out at https://wiki.ubuntu.com/UserNamespace. Goals: - Make it safe for an unprivileged user to unshare namespaces. They will be privileged with respect to the new namespace, but this should only include resources which the unprivileged user already owns. - Provide separate limits and accounting for userids in different namespaces. Status: Currently (as of 2.6.38) you can clone with the CLONE_NEWUSER flag to get a new user namespace if you have the CAP_SYS_ADMIN, CAP_SETUID, and CAP_SETGID capabilities. What this gets you is a whole new set of userids, meaning that user 500 will have a different 'struct user' in your namespace than in other namespaces. So any accounting information stored in struct user will be unique to your namespace. However, throughout the kernel there are checks which - simply check for a capability. Since root in a child namespace has all capabilities, this means that a child namespace is not constrained. - simply compare uid1 == uid2. Since these are the integer uids, uid 500 in namespace 1 will be said to be equal to uid 500 in namespace 2. As a result, the lxc implementation at lxc.sf.net does not use user namespaces. This is actually helpful because it leaves us free to develop user namespaces in such a way that, for some time, user namespaces may be unuseful. Bugs aside, this patchset is supposed to not at all affect systems which are not actively using user namespaces, and only restrict what tasks in child user namespace can do. They begin to limit privilege to a user namespace, so that root in a container cannot kill or ptrace tasks in the parent user namespace, and can only get world access rights to files. Since all files currently belong to the initila user namespace, that means that child user namespaces can only get world access rights to *all* files. While this temporarily makes user namespaces bad for system containers, it starts to get useful for some sandboxing. I've run the 'runltplite.sh' with and without this patchset and found no difference. This patch: copy_process() handles CLONE_NEWUSER before the rest of the namespaces. So in the case of clone(CLONE_NEWUSER|CLONE_NEWUTS) the new uts namespace will have the new user namespace as its owner. That is what we want, since we want root in that new userns to be able to have privilege over it. Changelog: Feb 15: don't set uts_ns->user_ns if we didn't create a new uts_ns. Feb 23: Move extern init_user_ns declaration from init/version.c to utsname.h. Signed-off-by: Serge E. Hallyn Acked-by: "Eric W. Biederman" Acked-by: Daniel Lezcano Acked-by: David Howells Cc: James Morris Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

utsns: extract creeate_uts_ns()

2009-06-18T20:03:55Z

create_uts_ns() will be used by C/R to create fresh uts_ns. Signed-off-by: Alexey Dobriyan Acked-by: Serge Hallyn Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

removed unused #include 's

2008-08-23T19:14:12Z

This patch lets the files using linux/version.h match the files that #include it. Signed-off-by: Adrian Bunk Signed-off-by: Linus Torvalds

kernel: explicitly include required header files under kernel/

2008-04-29T15:06:04Z

Following an experimental deletion of the unnecessary directive #include from the header file , these files under kernel/ were exposed as needing to include one of or , so explicit includes were added where necessary. Signed-off-by: Robert P. J. Day Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Fix UTS corruption during clone(CLONE_NEWUTS)

2007-09-19T18:24:17Z

struct utsname is copied from master one without any exclusion. Here is sample output from one proggie doing sethostname("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"); sethostname("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"); and another clone(,, CLONE_NEWUTS, ...) uname() hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaabbbbb' hostname = 'bbbaaaaaaaaaaaaaaaaaaaaaaaaaaa' hostname = 'aaaaaaaabbbbbbbbbbbbbbbbbbbbbb' hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaabbbb' hostname = 'aaaaaaaaaaaaaaaaaaaaaaaaaaaabb' hostname = 'aaabbbbbbbbbbbbbbbbbbbbbbbbbbb' hostname = 'bbbbbbbbbbbbbbbbaaaaaaaaaaaaaa' Hostname is sometimes corrupted. Yes, even _the_ simplest namespace activity had bug in it. :-( Signed-off-by: Alexey Dobriyan Acked-by: Serge Hallyn Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

namespace: ensure clone_flags are always stored in an unsigned long

2007-07-16T16:05:48Z

While working on unshare support for the network namespace I noticed we were putting clone flags in an int. Which is weird because the syscall uses unsigned long and we at least need an unsigned to properly hold all of the unshare flags. So to make the code consistent, this patch updates the code to use unsigned long instead of int for the clone flags in those places where we get it wrong today. Signed-off-by: Eric W. Biederman Acked-by: Cedric Le Goater Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

fix create_new_namespaces() return value

2007-07-16T16:05:47Z

dup_mnt_ns() and clone_uts_ns() return NULL on failure. This is wrong, create_new_namespaces() uses ERR_PTR() to catch an error. This means that the subsequent create_new_namespaces() will hit BUG_ON() in copy_mnt_ns() or copy_utsname(). Modify create_new_namespaces() to also use the errors returned by the copy_*_ns routines and not to systematically return ENOMEM. [oleg@tv-sign.ru: better changelog] Signed-off-by: Cedric Le Goater Cc: Serge E. Hallyn Cc: Badari Pulavarty Cc: Pavel Emelianov Cc: Herbert Poetzl Cc: Eric W. Biederman Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds