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* Don't pass inode to ->d_hash() and ->d_compare()Linus Torvalds2013-06-29
| | | | | | | | | | | | Instances either don't look at it at all (the majority of cases) or only want it to find the superblock (which can be had as dentry->d_sb). A few cases that want more are actually safe with dentry->d_inode - the only precaution needed is the check that it hadn't been replaced with NULL by rmdir() or by overwriting rename(), which case should be simply treated as cache miss. Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* proc_fill_cache(): clean up, get rid of pointless find_inode_number() useAl Viro2013-06-29
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* proc_fill_cache(): just make instantiate_t return intAl Viro2013-06-29
| | | | | | all instances always return ERR_PTR(-E...) or NULL, anyway Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* proc_pid_readdir(): stop wanking with proc_fill_cache() for /proc/selfAl Viro2013-06-29
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* proc_fill_cache(): kill pointless checkAl Viro2013-06-29
| | | | | | we'd just checked that child->d_inode is non-NULL, for fuck sake! Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [readdir] convert procfsAl Viro2013-06-29
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* kmsg: honor dmesg_restrict sysctl on /dev/kmsgKees Cook2013-06-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The dmesg_restrict sysctl currently covers the syslog method for access dmesg, however /dev/kmsg isn't covered by the same protections. Most people haven't noticed because util-linux dmesg(1) defaults to using the syslog method for access in older versions. With util-linux dmesg(1) defaults to reading directly from /dev/kmsg. To fix /dev/kmsg, let's compare the existing interfaces and what they allow: - /proc/kmsg allows: - open (SYSLOG_ACTION_OPEN) if CAP_SYSLOG since it uses a destructive single-reader interface (SYSLOG_ACTION_READ). - everything, after an open. - syslog syscall allows: - anything, if CAP_SYSLOG. - SYSLOG_ACTION_READ_ALL and SYSLOG_ACTION_SIZE_BUFFER, if dmesg_restrict==0. - nothing else (EPERM). The use-cases were: - dmesg(1) needs to do non-destructive SYSLOG_ACTION_READ_ALLs. - sysklog(1) needs to open /proc/kmsg, drop privs, and still issue the destructive SYSLOG_ACTION_READs. AIUI, dmesg(1) is moving to /dev/kmsg, and systemd-journald doesn't clear the ring buffer. Based on the comments in devkmsg_llseek, it sounds like actions besides reading aren't going to be supported by /dev/kmsg (i.e. SYSLOG_ACTION_CLEAR), so we have a strict subset of the non-destructive syslog syscall actions. To this end, move the check as Josh had done, but also rename the constants to reflect their new uses (SYSLOG_FROM_CALL becomes SYSLOG_FROM_READER, and SYSLOG_FROM_FILE becomes SYSLOG_FROM_PROC). SYSLOG_FROM_READER allows non-destructive actions, and SYSLOG_FROM_PROC allows destructive actions after a capabilities-constrained SYSLOG_ACTION_OPEN check. - /dev/kmsg allows: - open if CAP_SYSLOG or dmesg_restrict==0 - reading/polling, after open Addresses https://bugzilla.redhat.com/show_bug.cgi?id=903192 [akpm@linux-foundation.org: use pr_warn_once()] Signed-off-by: Kees Cook <keescook@chromium.org> Reported-by: Christian Kujau <lists@nerdbynature.de> Tested-by: Josh Boyer <jwboyer@redhat.com> Cc: Kay Sievers <kay@vrfy.org> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* posix-timers: Show clock ID in proc filePavel Tikhomirov2013-05-28
| | | | | | | | | | | | | Expand information about posix-timers in /proc/<pid>/timers by adding info about clock, with which the timer was created. I.e. in the forth line of timer info after "notify:" line go "ClockID: <clock_id>". Signed-off-by: Pavel Tikhomirov <snorcht@gmail.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Matthew Helsley <matt.helsley@gmail.com> Cc: Pavel Emelyanov <xemul@parallels.com> Link: http://lkml.kernel.org/r/1368742323-46949-2-git-send-email-snorcht@gmail.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* Merge branch 'slab/for-linus' of ↵Linus Torvalds2013-05-07
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux Pull slab changes from Pekka Enberg: "The bulk of the changes are more slab unification from Christoph. There's also few fixes from Aaron, Glauber, and Joonsoo thrown into the mix." * 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux: (24 commits) mm, slab_common: Fix bootstrap creation of kmalloc caches slab: Return NULL for oversized allocations mm: slab: Verify the nodeid passed to ____cache_alloc_node slub: tid must be retrieved from the percpu area of the current processor slub: Do not dereference NULL pointer in node_match slub: add 'likely' macro to inc_slabs_node() slub: correct to calculate num of acquired objects in get_partial_node() slub: correctly bootstrap boot caches mm/sl[au]b: correct allocation type check in kmalloc_slab() slab: Fixup CONFIG_PAGE_ALLOC/DEBUG_SLAB_LEAK sections slab: Handle ARCH_DMA_MINALIGN correctly slab: Common definition for kmem_cache_node slab: Rename list3/l3 to node slab: Common Kmalloc cache determination stat: Use size_t for sizes instead of unsigned slab: Common function to create the kmalloc array slab: Common definition for the array of kmalloc caches slab: Common constants for kmalloc boundaries slab: Rename nodelists to node slab: Common name for the per node structures ...
| * Merge branch 'slab/next' into slab/for-linusPekka Enberg2013-05-07
| |\
| | * stat: Use size_t for sizes instead of unsignedChristoph Lameter2013-02-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | On some platforms (such as IA64) the large page size may results in slab allocations to be allowed of numbers that do not fit in 32 bit. Acked-by: Glauber Costa <glommer@parallels.com> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
* | | proc_devtree: Replace include linux/module.h with linux/export.hSyam Sidhardhan2013-05-04
| | | | | | | | | | | | | | | | | | | | | | | | Since it uses only THIS_MODULE macro, include <linux/export.h> is the right to go here. Signed-off-by: Syam Sidhardhan <s.syam@samsung.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | | Merge branch 'for-linus' of ↵Linus Torvalds2013-05-01
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull VFS updates from Al Viro, Misc cleanups all over the place, mainly wrt /proc interfaces (switch create_proc_entry to proc_create(), get rid of the deprecated create_proc_read_entry() in favor of using proc_create_data() and seq_file etc). 7kloc removed. * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (204 commits) don't bother with deferred freeing of fdtables proc: Move non-public stuff from linux/proc_fs.h to fs/proc/internal.h proc: Make the PROC_I() and PDE() macros internal to procfs proc: Supply a function to remove a proc entry by PDE take cgroup_open() and cpuset_open() to fs/proc/base.c ppc: Clean up scanlog ppc: Clean up rtas_flash driver somewhat hostap: proc: Use remove_proc_subtree() drm: proc: Use remove_proc_subtree() drm: proc: Use minor->index to label things, not PDE->name drm: Constify drm_proc_list[] zoran: Don't print proc_dir_entry data in debug reiserfs: Don't access the proc_dir_entry in r_open(), r_start() r_show() proc: Supply an accessor for getting the data from a PDE's parent airo: Use remove_proc_subtree() rtl8192u: Don't need to save device proc dir PDE rtl8187se: Use a dir under /proc/net/r8180/ proc: Add proc_mkdir_data() proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h} proc: Move PDE_NET() to fs/proc/proc_net.c ...
| * | | proc: Move non-public stuff from linux/proc_fs.h to fs/proc/internal.hDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move non-public declarations and definitions from linux/proc_fs.h to fs/proc/internal.h. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Make the PROC_I() and PDE() macros internal to procfsDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make the PROC_I() and PDE() macros internal to procfs. This means making PDE_DATA() out of line. This could be made more optimal by storing PDE()->data into inode->i_private. Also provide a __PDE_DATA() that is inline and internal to procfs. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Supply a function to remove a proc entry by PDEDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Supply a function (proc_remove()) to remove a proc entry (and any subtree rooted there) by proc_dir_entry pointer rather than by name and (optionally) root dir entry pointer. This allows us to eliminate all remaining pde->name accesses outside of procfs. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Grant Likely <grant.likely@linaro.or> cc: linux-acpi@vger.kernel.org cc: openipmi-developer@lists.sourceforge.net cc: devicetree-discuss@lists.ozlabs.org cc: linux-pci@vger.kernel.org cc: netdev@vger.kernel.org cc: netfilter-devel@vger.kernel.org cc: alsa-devel@alsa-project.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | take cgroup_open() and cpuset_open() to fs/proc/base.cAl Viro2013-05-01
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Supply an accessor for getting the data from a PDE's parentDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Supply an accessor function for getting the private data from the parent proc_dir_entry struct of the proc_dir_entry struct associated with an inode. ReiserFS, for instance, stores the super_block pointer in the proc directory it makes for that super_block, and a pointer to the respective seq_file show function in each of the proc files in that directory. This allows a reduction in the number of file_operations structs, open functions and seq_operations structs required. The problem otherwise is that each show function requires two pieces of data but only has storage for one per PDE (and this has no release function). Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> cc: Jerry Chuang <jerry-chuang@realtek.com> cc: Maxim Mikityanskiy <maxtram95@gmail.com> cc: YAMANE Toshiaki <yamanetoshi@gmail.com> cc: linux-wireless@vger.kernel.org cc: linux-scsi@vger.kernel.org cc: devel@driverdev.osuosl.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Add proc_mkdir_data()David Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add proc_mkdir_data() to allow procfs directories to be created that are annotated at the time of creation with private data rather than doing this post-creation. This means no access is then required to the proc_dir_entry struct to set this. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> cc: Neela Syam Kolli <megaraidlinux@lsi.com> cc: Jerry Chuang <jerry-chuang@realtek.com> cc: linux-scsi@vger.kernel.org cc: devel@driverdev.osuosl.org cc: linux-wireless@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Move some bits from linux/proc_fs.h to linux/{of.h,signal.h,tty.h}David Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Move some bits from linux/proc_fs.h to linux/of.h, signal.h and tty.h. Also move proc_tty_init() and proc_device_tree_init() to fs/proc/internal.h as they're internal to procfs. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Grant Likely <grant.likely@secretlab.ca> cc: devicetree-discuss@lists.ozlabs.org cc: linux-arch@vger.kernel.org cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> cc: Jri Slaby <jslaby@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Move PDE_NET() to fs/proc/proc_net.cDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Move PDE_NET() to fs/proc/proc_net.c as that's where the only user is. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Split the namespace stuff out into linux/proc_ns.hDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Split the proc namespace stuff out into linux/proc_ns.h. Signed-off-by: David Howells <dhowells@redhat.com> cc: netdev@vger.kernel.org cc: Serge E. Hallyn <serge.hallyn@ubuntu.com> cc: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Move proc_fd() to fs/proc/fd.hDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Move proc_fd() to fs/proc/fd.h. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Uninline pid_delete_dentry()David Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Uninline pid_delete_dentry() as it's only used by three function pointers. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Supply PDE attribute setting accessor functionsDavid Howells2013-05-01
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Supply accessor functions to set attributes in proc_dir_entry structs. The following are supplied: proc_set_size() and proc_set_user(). Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> cc: linuxppc-dev@lists.ozlabs.org cc: linux-media@vger.kernel.org cc: netdev@vger.kernel.org cc: linux-wireless@vger.kernel.org cc: linux-pci@vger.kernel.org cc: netfilter-devel@vger.kernel.org cc: alsa-devel@alsa-project.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Split kcore bits from linux/procfs.h into linux/kcore.hDavid Howells2013-04-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Split kcore bits from linux/procfs.h into linux/kcore.h. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Acked-by: Ralf Baechle <ralf@linux-mips.org> cc: linux-mips@linux-mips.org cc: sparclinux@vger.kernel.org cc: x86@kernel.org cc: linux-mm@kvack.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | Include missing linux/magic.h inclusionsDavid Howells2013-04-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Include missing linux/magic.h inclusions where the source file is currently expecting to get magic numbers through linux/proc_fs.h. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-efi@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | Include missing linux/slab.h inclusionsDavid Howells2013-04-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Include missing linux/slab.h inclusions where the source file is currently expecting to get kmalloc() and co. through linux/proc_fs.h. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> cc: linux-s390@vger.kernel.org cc: sparclinux@vger.kernel.org cc: linux-efi@vger.kernel.org cc: linux-mtd@lists.infradead.org cc: devel@driverdev.osuosl.org cc: x86@kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | proc: Delete create_proc_read_entry()David Howells2013-04-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Delete create_proc_read_entry() as it no longer has any users. Also delete read_proc_t, write_proc_t, the read_proc member of the proc_dir_entry struct and the support functions that use them. This saves a pointer for every PDE allocated. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | try a saner locking for pde_opener...Al Viro2013-04-09
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | deal with races between remove_proc_entry() and proc_reg_release()Al Viro2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | * serialize the call of ->release() on per-pdeo mutex * don't remove pdeo from per-pde list until we are through with it Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | procfs: preparations for remove_proc_entry() race fixesAl Viro2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * leave ->proc_fops alone; make ->pde_users negative instead * trim pde_opener * move relevant code in fs/proc/inode.c Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | procfs: Clean up huge if-statement in __proc_file_read()David Howells2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Switch huge if-statement in __proc_file_read() around. This then puts the single line loop break immediately after the if-statement and allows us to de-indent the huge comment and make it take fewer lines. The code following the if-statement then follows naturally from the call to dp->read_proc(). Signed-off-by: David Howells <dhowells@redhat.com>
| * | | proc: Kill create_proc_entry()David Howells2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Kill create_proc_entry() in favour of create_proc_read_entry(), proc_create() and proc_create_data(). Signed-off-by: David Howells <dhowells@redhat.com>
| * | | procfs: new helper - PDE_DATA(inode)Al Viro2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The only part of proc_dir_entry the code outside of fs/proc really cares about is PDE(inode)->data. Provide a helper for that; static inline for now, eventually will be moved to fs/proc, along with the knowledge of struct proc_dir_entry layout. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | procfs: kill ->write_proc()Al Viro2013-04-09
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | procfs: don't allow to use proc_create, create_proc_entry, etc. for directoriesAl Viro2013-04-09
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | procfs: switch /proc/self away from proc_dir_entryAl Viro2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Just have it pinned in dcache all along and let procfs ->kill_sb() drop it before kill_anon_super(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| * | | mode_t, whack-a-mole at 11...Al Viro2013-04-09
| | | | | | | | | | | | | | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | | | fs, proc: truncate /proc/pid/comm writes to first TASK_COMM_LEN bytesDavid Rientjes2013-04-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently, a write to a procfs file will return the number of bytes successfully written. If the actual string is longer than this, the remainder of the string will not be be written and userspace will complete the operation by issuing additional write()s. Hence $ echo -n "abcdefghijklmnopqrs" > /proc/self/comm results in $ cat /proc/$$/comm pqrs since the final four bytes were written with a second write() since TASK_COMM_LEN == 16. This is obviously an undesired result and not equivalent to prctl(PR_SET_NAME). The implementation should not need to know the definition of TASK_COMM_LEN. This patch truncates the string to the first TASK_COMM_LEN bytes and returns the bytes written as the length of the string written so the second write() is suppressed. $ cat /proc/$$/comm abcdefghijklmno Signed-off-by: David Rientjes <rientjes@google.com> Acked-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | Merge branch 'timers-core-for-linus' of ↵Linus Torvalds2013-04-30
|\ \ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull core timer updates from Ingo Molnar: "The main changes in this cycle's merge are: - Implement shadow timekeeper to shorten in kernel reader side blocking, by Thomas Gleixner. - Posix timers enhancements by Pavel Emelyanov: - allocate timer ID per process, so that exact timer ID allocations can be re-created be checkpoint/restore code. - debuggability and tooling (/proc/PID/timers, etc.) improvements. - suspend/resume enhancements by Feng Tang: on certain new Intel Atom processors (Penwell and Cloverview), there is a feature that the TSC won't stop in S3 state, so the TSC value won't be reset to 0 after resume. This can be taken advantage of by the generic via the CLOCK_SOURCE_SUSPEND_NONSTOP flag: instead of using the RTC to recover/approximate sleep time, the main (and precise) clocksource can be used. - Fix /proc/timer_list for 4096 CPUs by Nathan Zimmer: on so many CPUs the file goes beyond 4MB of size and thus the current simplistic seqfile approach fails. Convert /proc/timer_list to a proper seq_file with its own iterator. - Cleanups and refactorings of the core timekeeping code by John Stultz. - International Atomic Clock time is managed by the NTP code internally currently but not exposed externally. Separate the TAI code out and add CLOCK_TAI support and TAI support to the hrtimer and posix-timer code, by John Stultz. - Add deep idle support enhacement to the broadcast clockevents core timer code, by Daniel Lezcano: add an opt-in CLOCK_EVT_FEAT_DYNIRQ clockevents feature (which will be utilized by future clockevents driver updates), which allows the use of IRQ affinities to avoid spurious wakeups of idle CPUs - the right CPU with an expiring timer will be woken. - Add new ARM bcm281xx clocksource driver, by Christian Daudt - ... various other fixes and cleanups" * 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (52 commits) clockevents: Set dummy handler on CPU_DEAD shutdown timekeeping: Update tk->cycle_last in resume posix-timers: Remove unused variable clockevents: Switch into oneshot mode even if broadcast registered late timer_list: Convert timer list to be a proper seq_file timer_list: Split timer_list_show_tickdevices posix-timers: Show sigevent info in proc file posix-timers: Introduce /proc/PID/timers file posix timers: Allocate timer id per process (v2) timekeeping: Make sure to notify hrtimers when TAI offset changes hrtimer: Fix ktime_add_ns() overflow on 32bit architectures hrtimer: Add expiry time overflow check in hrtimer_interrupt timekeeping: Shorten seq_count region timekeeping: Implement a shadow timekeeper timekeeping: Delay update of clock->cycle_last timekeeping: Store cycle_last value in timekeeper struct as well ntp: Remove ntp_lock, using the timekeeping locks to protect ntp state timekeeping: Simplify tai updating from do_adjtimex timekeeping: Hold timekeepering locks in do_adjtimex and hardpps timekeeping: Move ADJ_SETOFFSET to top level do_adjtimex() ...
| * \ \ \ Merge branch 'linus' into timers/coreThomas Gleixner2013-04-24
| |\ \ \ \ | | | |/ / | | |/| | | | | | | | | | | | | | | | | Reason: Get upstream fixes before adding conflicting code. Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | | | posix-timers: Show sigevent info in proc filePavel Emelyanov2013-04-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previous patch added proc file to list posix timers created by task. Expand the information provided in this file by adding info about notification method, with which timers were created. I.e. after the "ID:" line there go 1. "signal:" line, that shows signal number and sigval bits; 2. "notify:" line, that shows the timer notification method. Thus the timer entry would looke like this: ID: 123 signal: 14/0000000000b005d0 notify: signal/pid.732 This information is enough to understand how timer_create() was called for each particular timer. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Matthew Helsley <matt.helsley@gmail.com> Link: http://lkml.kernel.org/r/513DA024.80404@parallels.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * | | | posix-timers: Introduce /proc/PID/timers filePavel Emelyanov2013-04-17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Currently kernel doesn't provide any API for getting info about what posix timers are configured by processes. It's implied, that a process which configured some timers, knows what it did. However, for external tools it's impossible to get this information. In particular, this is critical for checkpoint-restore project to have this info. Introduce a per-pid proc file with information about posix timers. Since these timers are shared between threads, this file is present on tgid level only, no such thing in tid subdirs. The file format is expected to be the "/proc/<pid>/smaps"-like, i.e. each timer will occupy seveal lines to allow for future extending. Each new timer entry starts with the ID: <number> line which is added by this patch. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Matthew Helsley <matt.helsley@gmail.com> Link: http://lkml.kernel.org/r/513DA00D.6070009@parallels.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | | | | fs/proc/kcore.c: use register_hotmemory_notifier()Andrew Morton2013-04-29
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Saves an ifdef, no code size changes Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | | mm, vmalloc: move get_vmalloc_info() to vmalloc.cJoonsoo Kim2013-04-29
| |/ / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Now get_vmalloc_info() is in fs/proc/mmu.c. There is no reason that this code must be here and it's implementation needs vmlist_lock and it iterate a vmlist which may be internal data structure for vmalloc. It is preferable that vmlist_lock and vmlist is only used in vmalloc.c for maintainability. So move the code to vmalloc.c Signed-off-by: Joonsoo Kim <js1304@gmail.com> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Atsushi Kumagai <kumagai-atsushi@mxc.nes.nec.co.jp> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Dave Anderson <anderson@redhat.com> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Cc: Ingo Molnar <mingo@kernel.org> Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | | | kthread: Prevent unpark race which puts threads on the wrong cpuThomas Gleixner2013-04-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The smpboot threads rely on the park/unpark mechanism which binds per cpu threads on a particular core. Though the functionality is racy: CPU0 CPU1 CPU2 unpark(T) wake_up_process(T) clear(SHOULD_PARK) T runs leave parkme() due to !SHOULD_PARK bind_to(CPU2) BUG_ON(wrong CPU) We cannot let the tasks move themself to the target CPU as one of those tasks is actually the migration thread itself, which requires that it starts running on the target cpu right away. The solution to this problem is to prevent wakeups in park mode which are not from unpark(). That way we can guarantee that the association of the task to the target cpu is working correctly. Add a new task state (TASK_PARKED) which prevents other wakeups and use this state explicitly for the unpark wakeup. Peter noticed: Also, since the task state is visible to userspace and all the parked tasks are still in the PID space, its a good hint in ps and friends that these tasks aren't really there for the moment. The migration thread has another related issue. CPU0 CPU1 Bring up CPU2 create_thread(T) park(T) wait_for_completion() parkme() complete() sched_set_stop_task() schedule(TASK_PARKED) The sched_set_stop_task() call is issued while the task is on the runqueue of CPU1 and that confuses the hell out of the stop_task class on that cpu. So we need the same synchronizaion before sched_set_stop_task(). Reported-by: Dave Jones <davej@redhat.com> Reported-and-tested-by: Dave Hansen <dave@sr71.net> Reported-and-tested-by: Borislav Petkov <bp@alien8.de> Acked-by: Peter Ziljstra <peterz@infradead.org> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: dhillf@gmail.com Cc: Ingo Molnar <mingo@kernel.org> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/alpine.LFD.2.02.1304091635430.21884@ionos Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* | | | Merge branch 'for-linus' of ↵Linus Torvalds2013-04-09
|\ \ \ \ | | |/ / | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull vfs fixes from Al Viro: "A nasty bug in fs/namespace.c caught by Andrey + a couple of less serious unpleasantness - ecryptfs misc device playing hopeless games with try_module_get() and palinfo procfs support being... not quite correctly done, to be polite." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: mnt: release locks on error path in do_loopback palinfo fixes procfs: add proc_remove_subtree() ecryptfs: close rmmod race
| * | | procfs: add proc_remove_subtree()Al Viro2013-04-09
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | just what it sounds like; do that only to procfs subtrees you've created - doing that to something shared with another driver is not only antisocial, but might cause interesting races with proc_create() and its ilk. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* | | | Merge branch 'for-linus' of ↵Linus Torvalds2013-03-28
|\ \ \ \ | |/ / / |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace Pull userns fixes from Eric W Biederman: "The bulk of the changes are fixing the worst consequences of the user namespace design oversight in not considering what happens when one namespace starts off as a clone of another namespace, as happens with the mount namespace. The rest of the changes are just plain bug fixes. Many thanks to Andy Lutomirski for pointing out many of these issues." * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: userns: Restrict when proc and sysfs can be mounted ipc: Restrict mounting the mqueue filesystem vfs: Carefully propogate mounts across user namespaces vfs: Add a mount flag to lock read only bind mounts userns: Don't allow creation if the user is chrooted yama: Better permission check for ptraceme pid: Handle the exit of a multi-threaded init. scm: Require CAP_SYS_ADMIN over the current pidns to spoof pids.
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