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* posix-timers: Remove unused variableThomas Gleixner2013-04-18
| | | | | | | | Remove the unused variable *node introduced by commit 5ed67f05 (posix timers: Allocate timer id per process) Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Pavel Emelyanov <xemul@parallels.com>
* posix timers: Allocate timer id per process (v2)Pavel Emelyanov2013-04-17
| | | | | | | | | | | | | | | | | | | | | | Currently kernel generates IDs for posix timers in a global manner -- there's a kernel-wide IDR tree from which IDs are created. This makes it impossible to recreate a timer with a desired ID (in particular this is done by the CRIU checkpoint-restore project) -- since these IDs are global it may happen, that at the time we recreate a timer, the ID we want for it is already busy by some other timer. In order to address this, replace the IDR tree with a global hash table for timers and makes timer IDs unique per signal_struct (to which timers are linked anyway). With this, two timers belonging to different processes may have equal IDs and we can recreate either of them with the ID we want. 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/513D9FF5.9010004@parallels.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* hrtimer: Add hrtimer support for CLOCK_TAIJohn Stultz2013-03-22
| | | | | | Add hrtimer support for CLOCK_TAI, as well as posix timer interfaces. Signed-off-by: John Stultz <john.stultz@linaro.org>
* timekeeping: Add CLOCK_TAI clockidJohn Stultz2013-03-22
| | | | | | | | | This add a CLOCK_TAI clockid and the needed accessors. CC: Thomas Gleixner <tglx@linutronix.de> CC: Eric Dumazet <eric.dumazet@gmail.com> CC: Richard Cochran <richardcochran@gmail.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
* posix-timers: convert to idr_alloc()Tejun Heo2013-02-27
| | | | | | | | | Convert to the much saner new idr interface. Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* posix-timer: Don't call idr_find() with out-of-range IDTejun Heo2013-02-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | When idr_find() was fed a negative ID, it used to look up the ID ignoring the sign bit before recent ("idr: remove MAX_IDR_MASK and move left MAX_IDR_* into idr.c") patch. Now a negative ID triggers a WARN_ON_ONCE(). __lock_timer() feeds timer_id from userland directly to idr_find() without sanitizing it which can trigger the above malfunctions. Add a range check on @timer_id before invoking idr_find() in __lock_timer(). While timer_t is defined as int by all archs at the moment, Andrew worries that it may be defined as a larger type later on. Make the test cover larger integers too so that it at least is guaranteed to not return the wrong timer. Note that WARN_ON_ONCE() in idr_find() on id < 0 is transitional precaution while moving away from ignoring MSB. Once it's gone we can remove the guard as long as timer_t isn't larger than int. Signed-off-by: Tejun Heo <tj@kernel.org>nnn Reported-by: Sasha Levin <sasha.levin@oracle.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/20130220232412.GL3570@htj.dyndns.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timers: Fix clock_adjtime to always return timex data on successMiroslav Lichvar2013-01-15
| | | | | | | | | | The clock_adj call returns the clock state on success, which may be a non-zero value (e.g. TIME_INS), but the modified timex data is copied back to the user only when zero value (TIME_OK) was returned. Fix the condition to copy the data also with positive return values. Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
* kernel: Map most files to use export.h instead of module.hPaul Gortmaker2011-10-31
| | | | | | | | | | | | | | | | 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 <linux/module.h> +#include <linux/export.h> This commit is only changing the kernel dir; next targets will probably be mm, fs, the arch dirs, etc. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* posix-timers: RCU conversionEric Dumazet2011-05-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Ben Nagy reported a scalability problem with KVM/QEMU that hit very hard a single spinlock (idr_lock) in posix-timers code, on its 48 core machine. Even on a 16 cpu machine (2x4x2), a single test can show 98% of cpu time used in ticket_spin_lock, from lock_timer Ref: http://www.spinics.net/lists/kvm/msg51526.html Switching to RCU is quite easy, IDR being already RCU ready. idr_lock should be locked only for an insert/delete, not a lookup. Benchmark on a 2x4x2 machine, 16 processes calling timer_gettime(). Before : real 1m18.669s user 0m1.346s sys 1m17.180s After : real 0m3.296s user 0m1.366s sys 0m1.926s Reported-by: Ben Nagy <ben@iagu.net> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Tested-by: Ben Nagy <ben@iagu.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Avi Kivity <avi@redhat.com> Cc: John Stultz <johnstul@us.ibm.com> Cc: Richard Cochran <richard.cochran@omicron.at> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* hrtimers: Avoid touching inactive timer basesThomas Gleixner2011-05-23
| | | | | | | | Instead of iterating over all possible timer bases avoid it by marking the active bases in the cpu base. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Peter Zijlstra <peterz@infradead.org>
* Fix common misspellingsLucas De Marchi2011-03-31
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* timers: Export CLOCK_BOOTTIME via the posix timers interfaceJohn Stultz2011-02-21
| | | | | | | | | | This patch exports CLOCK_BOOTTIME through the posix timers interface CC: Jamie Lokier <jamie@shareable.org> CC: Thomas Gleixner <tglx@linutronix.de> CC: Alexander Shishkin <virtuoso@slind.org> CC: Arve Hjønnevåg <arve@android.com> Signed-off-by: John Stultz <john.stultz@linaro.org>
* posix clocks: Introduce dynamic clocksRichard Cochran2011-02-02
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for adding and removing posix clocks. The clock lifetime cycle is patterned after usb devices. Each clock is represented by a standard character device. In addition, the driver may optionally implement custom character device operations. The posix clock and timer system calls listed below now work with dynamic posix clocks, as well as the traditional static clocks. The following system calls are affected: - clock_adjtime (brand new syscall) - clock_gettime - clock_getres - clock_settime - timer_create - timer_delete - timer_gettime - timer_settime [ tglx: Adapted to the posix-timer cleanup. Moved clock_posix_dynamic to posix-clock.c and made all referenced functions static ] Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134420.164172635@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timers: Cleanup namespaceThomas Gleixner2011-02-02
| | | | | | | | | | | | Rename register_posix_clock() to posix_timers_register_clock(). That's what the function really does. As a side effect this cleans up the posix_clock namespace for the upcoming dynamic posix_clock infrastructure. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Richard Cochran <richard.cochran@omicron.at> Cc: John Stultz <johnstul@us.ibm.com> LKML-Reference: <alpine.LFD.2.00.1102021222240.31804@localhost6.localdomain6>
* posix-timers: Add support for fd based clocksRichard Cochran2011-02-02
| | | | | | | | | | | Extend the negative clockids which are currently used by posix cpu timers to encode the PID with a file descriptor based type which encodes the fd in the upper bits. Originally-from: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134420.062860200@linutronix.de>
* posix-timers: Introduce a syscall for clock tuning.Richard Cochran2011-02-02
| | | | | | | | | | | | | | | | A new syscall is introduced that allows tuning of a POSIX clock. The new call, clock_adjtime, takes two parameters, the clock ID and a pointer to a struct timex. Any ADJTIMEX(2) operation may be requested via this system call, but various POSIX clocks may or may not support tuning. [ tglx: Adapted to the posix-timer cleanup series. Avoid copy_to_user in the error case ] Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134419.869804645@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timer: Update commentRichard Cochran2011-02-02
| | | | | | | | | | Pick the cleanup to the comment in posix-timers.c from Richards all in one conversion patch. Originally-from: Richard Cochran <richardcochran@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134419.487708516@linutronix.de>
* posix-timers: Remove CLOCK_DISPATCH leftoversThomas Gleixner2011-02-02
| | | | | | | | | | | All users gone. Remove the cruft. Huge thanks to Richard Cochran who tackled that maze first. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134419.294620613@linutronix.de>
* posix-timers: Convert timer_delete() to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | Set the common function for CLOCK_MONOTONIC and CLOCK_REALTIME kclocks and use the new decoding function. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134419.198999420@linutronix.de>
* posix-timers: Convert timer_gettime() to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | Set the common function for CLOCK_MONOTONIC and CLOCK_REALTIME kclocks and use the new decoding function. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134419.101243181@linutronix.de>
* posix-timers: Convert timer_settime() to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | Set the common function for CLOCK_MONOTONIC and CLOCK_REALTIME kclocks and use the new decoding function. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134419.001863714@linutronix.de>
* posix-timers: Convert timer_create() to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | Setup timer_create for CLOCK_MONOTONIC and CLOCK_REALTIME kclocks and remove the no_timer_create() implementation. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.903604289@linutronix.de>
* posix-timers: Remove useless res field from k_clockThomas Gleixner2011-02-02
| | | | | | | | | | The res member of kclock is only used by mmtimer.c, but even there it contains redundant information. Remove the field and fixup mmtimer. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.808714587@linutronix.de>
* posix-timers: Convert clock_getres() to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | Use the new kclock decoding. Fixup the fallout in mmtimer.c Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.709802797@linutronix.de>
* posix-timers: Make clock_getres and clock_get mandatoryThomas Gleixner2011-02-02
| | | | | | | | | | | | Richard said: "I would think that we can require k_clocks to provide the read function. This could be checked and enforced in register_posix_clock()." Add checks for clock_getres and clock_get in the register function. Suggested-by: Richard Cochran <richardcochran@gmail.com> Cc: John Stultz <johnstul@us.ibm.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timers: Convert clock_gettime() to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | Use the new kclock decoding mechanism and rename the misnomed common_clock_get() to posix_clock_realtime_get(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.611097203@linutronix.de>
* posix-timers: Convert clock_settime to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | | Use the new kclock decoding function in clock_settime and cleanup all kclocks which use the default functions. Rename the misnomed common_clock_set() to posix_clock_realtime_set(). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.518851246@linutronix.de>
* posix-timers: Cleanup restart_block usageThomas Gleixner2011-02-02
| | | | | | | | | | posix timers still use the legacy arg0-arg3 members of restart_block. Use restart_block.nanosleep instead Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.232288779@linutronix.de>
* posix-timers: Convert clock_nanosleep_restart to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | Use the new kclock decoding function in clock_nanosleep_restart. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.131263211@linutronix.de>
* posix-timers: Convert clock_nanosleep to clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | Use the new kclock decoding function in clock_nanosleep and cleanup all kclocks which use the default functions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134418.034175556@linutronix.de>
* posix-timers: Introduce clockid_to_kclock()Thomas Gleixner2011-02-02
| | | | | | | | | | | | | | New function to find the kclock for a given clockid. Returns a pointer to clock_posix_cpu if clockid < 0. If clockid >= MAXCLOCK or if the clock_getres pointer is not set it returns NULL. For valid clocks it returns a pointer to the matching posix_clock. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <johnstul@us.ibm.com> Acked-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134417.938447839@linutronix.de>
* posix-timers: Cleanup struct initializersThomas Gleixner2011-02-02
| | | | | | | | | Cosmetic. No functional change Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134417.745627057@linutronix.de>
* posix-timers: Define nanosleep not supported error separateThomas Gleixner2011-02-02
| | | | | | | | | | Define the conditional nanosleep not supported error value outside of do_posix_clock_nonanosleep(). Preparatory patch for further cleanups. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: John Stultz <johnstul@us.ibm.com> Tested-by: Richard Cochran <richard.cochran@omicron.at> LKML-Reference: <20110201134417.643486574@linutronix.de>
* time: Correct the *settime* parametersRichard Cochran2011-02-02
| | | | | | | | | | | | Both settimeofday() and clock_settime() promise with a 'const' attribute not to alter the arguments passed in. This patch adds the missing 'const' attribute into the various kernel functions implementing these calls. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134417.545698637@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timers: Annotate lock_timer()Namhyung Kim2010-10-21
| | | | | | | | | | | lock_timer() conditionally grabs it_lock in case of returning non-NULL but unlock_timer() releases it unconditionally. This leads sparse to complain about the lock context imbalance. Rename and wrap lock_timer using __cond_lock() macro to make sparse happy. Signed-off-by: Namhyung Kim <namhyung@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix_timer: Move copy_to_user(created_timer_id) down in timer_create()Andrey Vagin2010-07-23
| | | | | | | | | | | | | | | According to Oleg Nesterov: We can move copy_to_user(created_timer_id) down after "if (timer_event_spec)" block too. (but before CLOCK_DISPATCH(), of course). Signed-off-by: Andrey Vagin <avagin@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Stanislaw Gruszka <sgruszka@redhat.com> Cc: Andrey Vagin <avagin@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix_timer: Fix error path in timer_createAndrey Vagin2010-05-27
| | | | | | | | | | | | | | | | | | Move CLOCK_DISPATCH(which_clock, timer_create, (new_timer)) after all posible EFAULT erros. *_timer_create may allocate/get resources. (for example posix_cpu_timer_create does get_task_struct) [ tglx: fold the remove crappy comment patch into this ] Signed-off-by: Andrey Vagin <avagin@openvz.org> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: <stable@kernel.org> Reviewed-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timers.c: Don't export local functionsH Hartley Sweeten2010-02-05
| | | | | | Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* time: Introduce CLOCK_REALTIME_COARSEjohn stultz2009-08-21
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | After talking with some application writers who want very fast, but not fine-grained timestamps, I decided to try to implement new clock_ids to clock_gettime(): CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE which returns the time at the last tick. This is very fast as we don't have to access any hardware (which can be very painful if you're using something like the acpi_pm clocksource), and we can even use the vdso clock_gettime() method to avoid the syscall. The only trade off is you only get low-res tick grained time resolution. This isn't a new idea, I know Ingo has a patch in the -rt tree that made the vsyscall gettimeofday() return coarse grained time when the vsyscall64 sysctrl was set to 2. However this affects all applications on a system. With this method, applications can choose the proper speed/granularity trade-off for themselves. Signed-off-by: John Stultz <johnstul@us.ibm.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: nikolag@ca.ibm.com Cc: Darren Hart <dvhltc@us.ibm.com> Cc: arjan@infradead.org Cc: jonathan@jonmasters.org LKML-Reference: <1250734414.6897.5.camel@localhost.localdomain> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* posix-timers: Fix oops in clock_nanosleep() with CLOCK_MONOTONIC_RAWHiroshi Shimamoto2009-08-04
| | | | | | | | | | | | | | Prevent calling do_nanosleep() with clockid CLOCK_MONOTONIC_RAW, it may cause oops, such as NULL pointer dereference. Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: John Stultz <johnstul@us.ibm.com> Cc: <stable@kernel.org> LKML-Reference: <4A764FF3.50607@ct.jp.nec.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* [CVE-2009-0029] System call wrappers part 05Heiko Carstens2009-01-14
| | | | Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
*-. Merge branches 'timers/clocksource', 'timers/hpet', 'timers/hrtimers', ↵Ingo Molnar2008-12-25
|\ \ | | | | | | | | | 'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/rtc' into timers/core
| | * posix-timers: check ->it_signal instead of ->it_pid to validate the timerOleg Nesterov2008-12-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: clean up, speed up ->it_pid (was ->it_process) has also a special meaning: if it is NULL, the timer is under deletion or it wasn't initialized yet. We can check ->it_signal != NULL instead, this way we can - simplify sys_timer_create() a bit - remove yet another check from lock_timer() - move put_pid(->it_pid) into release_posix_timer() which runs outside of ->it_lock Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| | * posix-timers: use "struct pid*" instead of "struct task_struct*"Oleg Nesterov2008-12-12
| |/ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Impact: restructure, clean up code k_itimer holds the ref to the ->it_process until sys_timer_delete(). This allows to pin up to RLIMIT_SIGPENDING dead task_struct's. Change the code to use "struct pid *" instead. The patch doesn't kill ->it_process, it places ->it_pid into the union. ->it_process is still used by do_cpu_nanosleep() as before. It would be trivial to change the nanosleep code as well, but since it uses it_process in a special way I think it is better to keep this field for grep. The patch bloats the kernel by 104 bytes and it also adds the new pointer, ->it_signal, to k_itimer. It is used by lock_timer() to verify that the found timer was not created by another process. It is not clear why do we use the global database (and thus the global idr_lock) for posix timers. We still need the signal_struct->posix_timers which contains all useable timers, perhaps it is better to use some form of per-process array instead. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* / Null pointer deref with hrtimer_try_to_cancel()Thomas Gleixner2008-12-20
|/ | | | | | | | | | | | | | | | | | | | | Impact: Prevent kernel crash with posix timer clockid CLOCK_MONOTONIC_RAW commit 2d42244ae71d6c7b0884b5664cf2eda30fb2ae68 (clocksource: introduce CLOCK_MONOTONIC_RAW) introduced a new clockid, which is only available to read out the raw not NTP adjusted system time. The above commit did not prevent that a posix timer can be created with that clockid. The timer_create() syscall succeeds and initializes the timer to a non existing hrtimer base. When the timer is deleted either by timer_delete() or by the exit() cleanup the kernel crashes. Prevent the creation of timers for CLOCK_MONOTONIC_RAW by setting the posix clock function to no_timer_create which returns an error code. Reported-and-tested-by: Eric Sesterhenn <snakebyte@gmx.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* Merge branch 'timers/range-hrtimers' into v28-range-hrtimers-for-linus-v2Thomas Gleixner2008-10-22
|\ | | | | | | | | | | | | | | Conflicts: kernel/time/tick-sched.c Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| * Merge commit 'linus/master' into merge-linusArjan van de Ven2008-10-17
| |\ | | | | | | | | | | | | | | | Conflicts: arch/x86/kvm/i8254.c
| * | hrtimer: convert kernel/* to the new hrtimer apisArjan van de Ven2008-09-06
| | | | | | | | | | | | | | | | | | | | | | | | In order to be able to do range hrtimers we need to use accessor functions to the "expire" member of the hrtimer struct. This patch converts kernel/* to these accessors. Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
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*---. \ \ Merge branches 'timers/clocksource', 'timers/hrtimers', 'timers/nohz', ↵Thomas Gleixner2008-10-20
|\ \ \ \ \ | | |_|/ / | |/| | / | | | |/ | | |/| 'timers/ntp', 'timers/posixtimers' and 'timers/debug' into v28-timers-for-linus
| | | * posix-timers: lock_timer: make it readableOleg Nesterov2008-09-24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cleanup. Imho makes the code much more understandable. At least this patch lessens both the source and compiled code. Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: mingo@elte.hu Cc: Roland McGrath <roland@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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