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* [PATCH] add process_session() helper routine: deprecate old fieldCedric Le Goater2006-12-08
| | | | | | | | | | | | Add an anonymous union and ((deprecated)) to catch direct usage of the session field. [akpm@osdl.org: fix various missed conversions] [jdike@addtoit.com: fix UML bug] Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: change uses of f_{dentry, vfsmnt} to use f_pathJosef "Jeff" Sipek2006-12-08
| | | | | | | | | Change all the uses of f_{dentry,vfsmnt} to f_path.{dentry,mnt} in the proc filesystem code. Signed-off-by: Josef "Jeff" Sipek <jsipek@cs.sunysb.edu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] do_task_stat(): don't take tty_mutexOleg Nesterov2006-12-08
| | | | | | | | | | ->signal->tty is protected by ->siglock, no need to take the global tty_mutex. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Fix linux banner utsname informationHerbert Poetzl2006-12-08
| | | | | | | | | | | | utsname information is shown in the linux banner, which also is used for /proc/version (which can have different utsname values inside a uts namespaces). this patch makes the varying data arguments and changes the string to a format string, using those arguments. Signed-off-by: Herbert Poetzl <herbert@13thfloor.at> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] make fs/proc/base.c:proc_pid_instantiate() staticAdrian Bunk2006-12-07
| | | | | | | Signed-off-by: Adrian Bunk <bunk@stusta.de> Acked-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] elf: fix kcore note size calculationMagnus Damm2006-12-07
| | | | | | | | | | | | | | - Define "CORE" string as CORE_STR in single common place. - Include terminating zero in CORE_STR length calculation for elf_buflen. - Use roundup(,4) to include alignment in elf_buflen calculation. [akpm@osdl.org: simplification suggested by Roland] Signed-off-by: Magnus Damm <magnus@valinux.co.jp> Cc: Daniel Jacobowitz <drow@false.org> Cc: Roland McGrath <roland@redhat.com> Cc: Jakub Jelinek <jakub@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] remove the syslog interface when printk is disabledMike Galbraith2006-12-07
| | | | | | | | | | | Attempts to read() from the non-existent dmesg buffer will return zero and userspace tends to get stuck in a busyloop. So just remove /dev/kmsg altogether if CONFIG_PRINTK=n. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] slab: remove kmem_cache_tChristoph Lameter2006-12-07
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Replace all uses of kmem_cache_t with struct kmem_cache. The patch was generated using the following script: #!/bin/sh # # Replace one string by another in all the kernel sources. # set -e for file in `find * -name "*.c" -o -name "*.h"|xargs grep -l $1`; do quilt add $file sed -e "1,\$s/$1/$2/g" $file >/tmp/$$ mv /tmp/$$ $file quilt refresh done The script was run like this sh replace kmem_cache_t "struct kmem_cache" Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] slab: remove SLAB_KERNELChristoph Lameter2006-12-07
| | | | | | | | SLAB_KERNEL is an alias of GFP_KERNEL. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Allow user processes to raise their oom_adj valueGuillem Jover2006-12-07
| | | | | | | | | | | | | | | | | | Currently a user process cannot rise its own oom_adj value (i.e. unprotecting itself from the OOM killer). As this value is stored in the task structure it gets inherited and the unprivileged childs will be unable to rise it. The EPERM will be handled by the generic proc fs layer, as only processes with the proper caps or the owner of the process will be able to write to the file. So we allow only the processes with CAP_SYS_RESOURCE to lower the value, otherwise it will get an EACCES which seems more appropriate than EPERM. Signed-off-by: Guillem Jover <guillem.jover@nokia.com> Acked-by: Andrea Arcangeli <andrea@novell.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] severing fs.h, radix-tree.h -> sched.hAl Viro2006-12-04
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* [PATCH] mounstats NULL pointer dereferenceVasily Tarasov2006-11-25
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | OpenVZ developers team has encountered the following problem in 2.6.19-rc6 kernel. After some seconds of running script while [[ 1 ]] do find /proc -name mountstats | xargs cat done this Oops appears: BUG: unable to handle kernel NULL pointer dereference at virtual address 00000010 printing eip: c01a6b70 *pde = 00000000 Oops: 0000 [#1] SMP Modules linked in: xt_length ipt_ttl xt_tcpmss ipt_TCPMSS iptable_mangle iptable_filter xt_multiport xt_limit ipt_tos ipt_REJECT ip_tables x_tables parport_pc lp parport sunrpc af_packet thermal processor fan button battery asus_acpi ac ohci_hcd ehci_hcd usbcore i2c_nforce2 i2c_core tg3 floppy pata_amd ide_cd cdrom sata_nv libata CPU: 1 EIP: 0060:[<c01a6b70>] Not tainted VLI EFLAGS: 00010246 (2.6.19-rc6 #2) EIP is at mountstats_open+0x70/0xf0 eax: 00000000 ebx: e6247030 ecx: e62470f8 edx: 00000000 esi: 00000000 edi: c01a6b00 ebp: c33b83c0 esp: f4105eb4 ds: 007b es: 007b ss: 0068 Process cat (pid: 6044, ti=f4105000 task=f4104a70 task.ti=f4105000) Stack: c33b83c0 c04ee940 f46a4a80 c33b83c0 e4df31b4 c01a6b00 f4105000 c0169231 e4df31b4 c33b83c0 c33b83c0 f4105f20 00000003 f4105000 c0169445 f2503cf0 f7f8c4c0 00008000 c33b83c0 00000000 00008000 c0169350 f4105f20 00008000 Call Trace: [<c01a6b00>] mountstats_open+0x0/0xf0 [<c0169231>] __dentry_open+0x181/0x250 [<c0169445>] nameidata_to_filp+0x35/0x50 [<c0169350>] do_filp_open+0x50/0x60 [<c01873d6>] seq_read+0xc6/0x300 [<c0169511>] get_unused_fd+0x31/0xc0 [<c01696d3>] do_sys_open+0x63/0x110 [<c01697a7>] sys_open+0x27/0x30 [<c01030bd>] sysenter_past_esp+0x56/0x79 ======================= Code: 45 74 8b 54 24 20 89 44 24 08 8b 42 f0 31 d2 e8 47 cb f8 ff 85 c0 89 c3 74 51 8d 80 a0 04 00 00 e8 46 06 2c 00 8b 83 48 04 00 00 <8b> 78 10 85 ff 74 03 f0 ff 07 b0 01 86 83 a0 04 00 00 f0 ff 4b EIP: [<c01a6b70>] mountstats_open+0x70/0xf0 SS:ESP 0068:f4105eb4 The problem is that task->nsproxy can be equal NULL for some time during task exit. This patch fixes the BUG. Signed-off-by: Vasily Tarasov <vtaras@openvz.org> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: "Serge E. Hallyn" <serue@us.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] OOM killer meets userspace headersAlexey Dobriyan2006-10-20
| | | | | | | | | | | | | | | | | | | Despite mm.h is not being exported header, it does contain one thing which is part of userspace ABI -- value disabling OOM killer for given process. So, a) create and export include/linux/oom.h b) move OOM_DISABLE define there. c) turn bounding values of /proc/$PID/oom_adj into defines and export them too. Note: mass __KERNEL__ removal will be done later. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] PROC_NUMBUF is wrongAndrew Morton2006-10-17
| | | | | | | | | | Actually, the decimal representation of a 32-bit signed number can take 12 bytes, including the \0. And then some code adds a \n as well, so let's give it 13 bytes. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* IRQ: Maintain regs pointer globally rather than passing to IRQ handlersDavid Howells2006-10-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
* [PATCH] introduce get_task_pid() to fix unsafe get_pid()Oleg Nesterov2006-10-02
| | | | | | | | | | | | | | proc_pid_make_inode: ei->pid = get_pid(task_pid(task)); I think this is not safe. get_pid() can be preempted after checking "pid != NULL". Then the task exits, does detach_pid(), and RCU frees the pid. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: comment what proc_fill_cache doesEric W. Biederman2006-10-02
| | | | | | | Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: remove the useless SMP-safe comments from /procEric W. Biederman2006-10-02
| | | | | | | Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: remove trailing blank entry from pid_entry arraysEric W. Biederman2006-10-02
| | | | | | | | | | It was pointed out that since I am taking ARRAY_SIZE anyway the trailing empty entry is silly and just wastes space. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: properly compute TGID_OFFSETEric W. Biederman2006-10-02
| | | | | | | | | | The value doesn't change but this ensures I will have the proper value when other files are added to proc_base_stuff. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: drop tasklist lock in task_state()Oleg Nesterov2006-10-02
| | | | | | | | | | | | | | | | | | | task_state() needs tasklist_lock to protect ->parent/->real_parent. However task->parent points to nowhere only when the actions below happen in order 1) release_task(task) 2) release_task(task->parent) 3) a grace period passed But 3) implies that the memory ops from 1) should be finished, so pid_alive() can't be true in such a case. Otherwise, we don't care if ->parent/->real_parent changes under us. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: convert do_task_stat() to use lock_task_sighand()Oleg Nesterov2006-10-02
| | | | | | | | | | | | | | | | | | | | | | | Drop tasklist_lock. ->siglock protects almost all interesting data (including sub-threads traversal) except: ->signal->tty protected by tty_mutex ->real_parent the task can't be unhashed while we are holding ->siglock, so ->real_parent can change from under us but we can safely dereference it under rcu_read_lock() ->pgrp/->session we can get inconsistent numbers if the task does sys_setsid/daemonize at the same time. I hope this is acceptable. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: convert task_sig() to use lock_task_sighand()Oleg Nesterov2006-10-02
| | | | | | | | | lock_task_sighand() can take ->siglock without holding tasklist_lock. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: Use pid_task instead of open coding itEric W. Biederman2006-10-02
| | | | | | Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: Merge proc_tid_attr and proc_tgid_attrEric W. Biederman2006-10-02
| | | | | | | | | | The implementation is exactly the same and there is currently nothing to distinguish proc_tid_attr, and proc_tgid_attr. So it is pointless to have two separate implementations. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: Remove the hard coded inode numbersEric W. Biederman2006-10-02
| | | | | | | | | | | | | | | | | | | | | The hard coded inode numbers in proc currently limit its maintainability, its flexibility, and what can be done with the rest of system. /proc limits pid-max to 32768 on 32 bit systems it limits fd-max to 32768 on all systems, and placing the pid in the inode number really gets in the way of implementing subdirectories of per process information. Ever since people started adding to the middle of the file type enumeration we haven't been maintaing the historical inode numbers, all we have really succeeded in doing is keeping the pid in the proc inode number. The pid is already available in the directory name so no information is lost removing it from the inode number. So if something in user space cares if we remove the inode number from the /proc inode it is almost certainly broken. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: Factor out an instantiate method from every lookup methodEric W. Biederman2006-10-02
| | | | | | | | | | | | To remove the hard coded proc inode numbers it is necessary to be able to create the proc inodes during readdir. The instantiate methods are the subset of lookup that is needed to accomplish that. This first step just splits the lookup methods into 2 functions. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: Make the generation of the self symlink table drivenEric W. Biederman2006-10-02
| | | | | | | | | | | | | | | | | | | | | | This patch generalizes the concept of files in /proc that are related to processes but live in the root directory of /proc Ideally this would reuse infrastructure from the rest of the process specific parts of proc but unfortunately security_task_to_inode must not be called on files that are not strictly per process. security_task_to_inode really needs to be reexamined as the security label can change in important places that we are not currently catching, but I'm not certain that simplifies this problem. By at least matching the structure of the rest of proc we get more idiom reuse and it becomes easier to spot problems in the way things are put together. Later things like /proc/mounts are likely to be moved into proc_base as well. If union mounts are ever supported we may be able to make /proc a union mount, and properly split it into 2 filesystems. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] namespaces: incorporate fs namespace into nsproxySerge E. Hallyn2006-10-02
| | | | | | | | | | | | | | | This moves the mount namespace into the nsproxy. The mount namespace count now refers to the number of nsproxies point to it, rather than the number of tasks. As a result, the unshare_namespace() function in kernel/fork.c no longer checks whether it is being shared. Signed-off-by: Serge Hallyn <serue@us.ibm.com> Cc: Kirill Korotaev <dev@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Andrey Savochkin <saw@sw.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] Define struct pspaceSukadev Bhattiprolu2006-10-02
| | | | | | | | | | | | | | | | | | | Define a per-container pid space object. And create one instance of this object, init_pspace, to define the entire pid space. Subsequent patches will provide/use interfaces to create/destroy pid spaces. Its a subset/rework of Eric Biederman's patch http://lkml.org/lkml/2006/2/6/285 . Signed-off-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@us.ibm.com> Cc: Dave Hansen <haveblue@us.ibm.com> Cc: Serge Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: Kirill Korotaev <dev@sw.ru> Cc: Andrey Savochkin <saw@sw.ru> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: give the root directory a taskEric W. Biederman2006-10-02
| | | | | | | | | | | | | | Helper functions in base.c like proc_pident_readdir and proc_pident_lookup assume the directories have an associated task, and cannot currently be used on the /proc root directory because it does not have such a task. This small changes allows for base.c to be simplified and later when multiple pid spaces are introduced it makes getting the needed context information trivial. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: modify proc_pident_lookup to be completely table drivenEric W. Biederman2006-10-02
| | | | | | | | | | | Currently proc_pident_lookup gets the names and types from a table and then has a huge switch statement to get the inode and file operations it needs. That is silly and is becoming increasingly hard to maintain so I just put all of the information in the table. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: reorder the functions in base.cEric W. Biederman2006-10-02
| | | | | | | | | | | | | | | | | | | | | | | | There were enough changes in my last round of cleaning up proc I had to break up the patch series into smaller chunks, and my last chunk never got resent. This patchset gives proc dynamic inode numbers (the static inode numbers were a pain to maintain and prevent all kinds of things), and removes the horrible switch statements that had to be kept in sync with everything else. Being fully table driver takes us 90% of the way of being able to register new process specific attributes in proc. This patch: Group the functions by what they implement instead of by type of operation. As it existed base.c was quickly approaching the point where it could not be followed. No functionality or code changes asside from adding/removing forward declartions are implemented in this patch. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] proc: readdir race fix (take 3)Eric W. Biederman2006-10-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The problem: An opendir, readdir, closedir sequence can fail to report process ids that are continually in use throughout the sequence of system calls. For this race to trigger the process that proc_pid_readdir stops at must exit before readdir is called again. This can cause ps to fail to report processes, and it is in violation of posix guarantees and normal application expectations with respect to readdir. Currently there is no way to work around this problem in user space short of providing a gargantuan buffer to user space so the directory read all happens in on system call. This patch implements the normal directory semantics for proc, that guarantee that a directory entry that is neither created nor destroyed while reading the directory entry will be returned. For directory that are either created or destroyed during the readdir you may or may not see them. Furthermore you may seek to a directory offset you have previously seen. These are the guarantee that ext[23] provides and that posix requires, and more importantly that user space expects. Plus it is a simple semantic to implement reliable service. It is just a matter of calling readdir a second time if you are wondering if something new has show up. These better semantics are implemented by scanning through the pids in numerical order and by making the file offset a pid plus a fixed offset. The pid scan happens on the pid bitmap, which when you look at it is remarkably efficient for a brute force algorithm. Given that a typical cache line is 64 bytes and thus covers space for 64*8 == 200 pids. There are only 40 cache lines for the entire 32K pid space. A typical system will have 100 pids or more so this is actually fewer cache lines we have to look at to scan a linked list, and the worst case of having to scan the entire pid bitmap is pretty reasonable. If we need something more efficient we can go to a more efficient data structure for indexing the pids, but for now what we have should be sufficient. In addition this takes no additional locks and is actually less code than what we are doing now. Also another very subtle bug in this area has been fixed. It is possible to catch a task in the middle of de_thread where a thread is assuming the thread of it's thread group leader. This patch carefully handles that case so if we hit it we don't fail to return the pid, that is undergoing the de_thread dance. Thanks to KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> for providing the first fix, pointing this out and working on it. [oleg@tv-sign.ru: fix it] Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Jean Delvare <jdelvare@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] BLOCK: Make it possible to disable the block layer [try #6]David Howells2006-09-30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make it possible to disable the block layer. Not all embedded devices require it, some can make do with just JFFS2, NFS, ramfs, etc - none of which require the block layer to be present. This patch does the following: (*) Introduces CONFIG_BLOCK to disable the block layer, buffering and blockdev support. (*) Adds dependencies on CONFIG_BLOCK to any configuration item that controls an item that uses the block layer. This includes: (*) Block I/O tracing. (*) Disk partition code. (*) All filesystems that are block based, eg: Ext3, ReiserFS, ISOFS. (*) The SCSI layer. As far as I can tell, even SCSI chardevs use the block layer to do scheduling. Some drivers that use SCSI facilities - such as USB storage - end up disabled indirectly from this. (*) Various block-based device drivers, such as IDE and the old CDROM drivers. (*) MTD blockdev handling and FTL. (*) JFFS - which uses set_bdev_super(), something it could avoid doing by taking a leaf out of JFFS2's book. (*) Makes most of the contents of linux/blkdev.h, linux/buffer_head.h and linux/elevator.h contingent on CONFIG_BLOCK being set. sector_div() is, however, still used in places, and so is still available. (*) Also made contingent are the contents of linux/mpage.h, linux/genhd.h and parts of linux/fs.h. (*) Makes a number of files in fs/ contingent on CONFIG_BLOCK. (*) Makes mm/bounce.c (bounce buffering) contingent on CONFIG_BLOCK. (*) set_page_dirty() doesn't call __set_page_dirty_buffers() if CONFIG_BLOCK is not enabled. (*) fs/no-block.c is created to hold out-of-line stubs and things that are required when CONFIG_BLOCK is not set: (*) Default blockdev file operations (to give error ENODEV on opening). (*) Makes some /proc changes: (*) /proc/devices does not list any blockdevs. (*) /proc/diskstats and /proc/partitions are contingent on CONFIG_BLOCK. (*) Makes some compat ioctl handling contingent on CONFIG_BLOCK. (*) If CONFIG_BLOCK is not defined, makes sys_quotactl() return -ENODEV if given command other than Q_SYNC or if a special device is specified. (*) In init/do_mounts.c, no reference is made to the blockdev routines if CONFIG_BLOCK is not defined. This does not prohibit NFS roots or JFFS2. (*) The bdflush, ioprio_set and ioprio_get syscalls can now be absent (return error ENOSYS by way of cond_syscall if so). (*) The seclvl_bd_claim() and seclvl_bd_release() security calls do nothing if CONFIG_BLOCK is not set, since they can't then happen. Signed-Off-By: David Howells <dhowells@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* [PATCH] Kcore elf note namesz field fixVivek Goyal2006-09-29
| | | | | | | | | | | | | | | o As per ELF specifications, it looks like that elf note "namesz" field contains the length of "name" including the size of null character. And currently we are filling "namesz" without taking into the consideration the null character size. o Kexec-tools performs this check deligently hence I ran into the issue while trying to open /proc/kcore in kexec-tools for some info. Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] fix mem_write() return valueFrederik Deweerdt2006-09-29
| | | | | | | | | | | | At the beginning of the routine, "copied" is set to 0, but it is no good because in lines 805 and 812 it is set to other values. Finally, the routine returns as if it copied 12 (=ENOMEM) bytes less than it actually did. Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com> Acked-by: Eric Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] tty: stop the tty vanishing under procfs accessAlan Cox2006-09-29
| | | | | | Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] NOMMU: move the fallback arch_vma_name() to a sensible placeDavid Howells2006-09-27
| | | | | | | | | | | | | Move the fallback arch_vma_name() to a sensible place (kernel/signal.c). Currently it's in fs/proc/task_mmu.c, a file that is dependent on both CONFIG_PROC_FS and CONFIG_MMU being enabled, but it's used from kernel/signal.c from where it is called unconditionally. [akpm@osdl.org: build fix] Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] NOMMU: Implement /proc/pid/maps for NOMMUDavid Howells2006-09-27
| | | | | | | | | Implement /proc/pid/maps for NOMMU by reading the vm_area_list attached to current->mm->context.vmlist. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] fs: Conversions from kmalloc+memset to k(z|c)allocPanagiotis Issaris2006-09-27
| | | | | | | | | Conversions from kmalloc+memset to kzalloc. Signed-off-by: Panagiotis Issaris <takis@issaris.org> Jffs2-bit-acked-by: David Woodhouse <dwmw2@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] ZVC: Support NR_SLAB_RECLAIMABLE / NR_SLAB_UNRECLAIMABLEChristoph Lameter2006-09-26
| | | | | | | | | | | | | Remove the atomic counter for slab_reclaim_pages and replace the counter and NR_SLAB with two ZVC counter that account for unreclaimable and reclaimable slab pages: NR_SLAB_RECLAIMABLE and NR_SLAB_UNRECLAIMABLE. Change the check in vmscan.c to refer to to NR_SLAB_RECLAIMABLE. The intend seems to be to check for slab pages that could be freed. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] reduce MAX_NR_ZONES: make display of highmem counters conditional on ↵Christoph Lameter2006-09-26
| | | | | | | | | | | | | | | | | | CONFIG_HIGHMEM Do not display HIGHMEM memory sizes if CONFIG_HIGHMEM is not set. Make HIGHMEM dependent texts and make display of highmem counters optional Some texts are depending on CONFIG_HIGHMEM. Remove those strings and remove the display of highmem counter values if CONFIG_HIGHMEM is not set. [akpm@osdl.org: remove some ifdefs] Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] /proc/meminfo: don't put spaces in namesAndrew Morton2006-08-27
| | | | | | | | | | None of the other /proc/meminfo lines have a space in the identifier. This post-2.6.17 addition has the potential to break existing parsers, so use an underscore instead (like Committed_AS). Cc: Christoph Lameter <clameter@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Don't allow chmod() on the /proc/<pid>/ filesLinus Torvalds2006-07-15
| | | | | | | | | | | | | | | | This just turns off chmod() on the /proc/<pid>/ files, since there is no good reason to allow it, and had we disallowed it originally, the nasty /proc race exploit wouldn't have been possible. The other patches already fixed the problem chmod() could cause, so this is really just some final mop-up.. This particular version is based off a patch by Eugene and Marcel which had much better naming than my original equivalent one. Signed-off-by: Eugene Teo <eteo@redhat.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Mark /proc MS_NOSUID and MS_NOEXECLinus Torvalds2006-07-15
| | | | | | | Not that we really need this any more, but at the same time there's no reason not to do this. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] per-task-delay-accounting: /proc export of aggregated block I/O delaysShailabh Nagar2006-07-15
| | | | | | | | | | | | | | | | | | | | Export I/O delays seen by a task through /proc/<tgid>/stats for use in top etc. Note that delays for I/O done for swapping in pages (swapin I/O) is clubbed together with all other I/O here (this is not the case in the netlink interface where the swapin I/O is kept distinct) [akpm@osdl.org: printk warning fix] Signed-off-by: Shailabh Nagar <nagar@watson.ibm.com> Signed-off-by: Balbir Singh <balbir@in.ibm.com> Cc: Jes Sorensen <jes@sgi.com> Cc: Peter Chubb <peterc@gelato.unsw.edu.au> Cc: Erich Focht <efocht@ess.nec.de> Cc: Levent Serinol <lserinol@gmail.com> Cc: Jay Lan <jlan@engr.sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Relax /proc fix a bitLinus Torvalds2006-07-15
| | | | | | | Clearign all of i_mode was a bit draconian. We only really care about S_ISUID/ISGID, after all. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* Fix nasty /proc vulnerabilityLinus Torvalds2006-07-14
| | | | | | | | | We have a bad interaction with both the kernel and user space being able to change some of the /proc file status. This fixes the most obvious part of it, but I expect we'll also make it harder for users to modify even their "own" files in /proc. Signed-off-by: Linus Torvalds <torvalds@osdl.org>
* [PATCH] /fs/proc/: 'larger than buffer size' memory accessed by clear_user()Adam B. Jerome2006-07-12
| | | | | | | | | | | Address a potential 'larger than buffer size' memory access by clear_user(). Without this patch, this call to clear_user() can attempt to clear too many (tsz) bytes resulting in a wrong (-EFAULT) return code by read_kcore(). Signed-off-by: Adam B. Jerome <abj@novell.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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