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path: root/sys/kern/kern_sig.c
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2014-11-16Rework the __thrsigdivert (aka sigwait()) handling: instead of interferingPhilip Guenther
in ptsignal(), which broke ptrace() in various circumstances, act more like sigsuspend() by updating the signal mask and picking off waited for signals when one occurs. Don't always restart when an unwaited-for-but-handled signal occurs, as that screws with both timeout calculation and cancellation. main problem noted by jmatthew@ ok tedu@
2014-08-10Write the core file of a non-suid process into the current directoryAlexander Bluhm
even if sysctl kern.nosuidcoredump has been set to 2 or 3. This allows a regular user to debug his programs again. OK guenther@ deraadt@
2014-07-13Introduce PS_NOBROADCASTKILL a process flag that excludes processes fromClaudio Jeker
receiving broadcast signals (kill -1). The flag can be set via a new sysctl KERN_PROC_NOBROADCASTKILL. This will be used by iscsid to survive the mass killing by init(8) when terminating multi-user operations. With and OK guenther@
2014-07-13KERNEL_ASSERT_LOCKED(9): Assertion for kernel lock (Rev. 3)Masao Uebayashi
This adds a new assertion macro, KERNEL_ASSERT_LOCKED(), to assert that kernel_lock is held. In the long process of removing kernel_lock, there will be a lot (hundreds or thousands) of use of this; virtually almost all functions in !MP-safe subsystems should have this assertion. Thus this assertion should have a short, good name. Not only that "KERNEL_ASSERT_LOCKED" is consistent with other KERNEL_* and SCHED_ASSERT_LOCKED() macros. Input from dlg@ guenther@ kettenis@. OK dlg@ guenther@
2014-07-12Refactor out dosigsuspend() functionMatthew Dempsky
Discussed with guenther and kettenis
2014-07-11It's init as a process that's special, not init's original thread.Philip Guenther
Remember initprocess instead of initproc. ok matthew@ blambert@
2014-07-08decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.hTheo de Raadt
don't need to be married. ok guenther miod beck jsing kettenis
2014-07-04Track whether a process is a zombie or not yet fully built via flagsPhilip Guenther
PS_{ZOMBIE,EMBRYO} on the process instead of peeking into the process's thread data. This eliminates the need for the thread-level SDEAD state. Change kvm_getprocs() (both the sysctl() and kvm backends) to report the "most active" scheduler state for the process's threads. tweaks kettenis@ feedback and ok matthew@
2014-06-21If the kernel generates a deadly trap signal (SEGV, BUS, etc) forPhilip Guenther
an untraced process but finds it blocking or ignoring it, just kill the process instead of looping. It's undefined behavor in POSIX but quite annoying when encountered in practice. improvements from kettenis@ ok matthew@
2014-05-04Add PS_SYSTEM, the process-level mirror of the thread-level P_SYSTEM,Philip Guenther
and FORK_SYSTEM as a flag to set them. This eliminates needing to peek into other processes threads in various places. Inspired by NetBSD ok miod@ matthew@
2014-05-04When kern.nosuidcoredump=3, act like =2 but try to dump cores intoTheo de Raadt
the /var/crash/programname/ directory, as root. For instance, # mkdir /var/crash/bgpd/ # chmod 700 /var/crash/bgpd/ # If you skip this step, you are a moron # sysctl kern.nosuidcoredump=3 # bgpd # pkill -ABRT bgpd # ls /var/crash/bgpd/ 14764.core 23207.core 6423.core Of course, in real life the idea is that you don't kill the daemon but it crashes and you collect parallel cores. Careful you don't fill your /var. Further tuneables are being considered. Sorry to be picking on bgpd for this example. I've watched the "too difficult to debug privsep code" angst for far too long. ok guenther
2014-04-18Have each thread keeps its own (counted!) reference to the process's ucredsPhilip Guenther
to avoid possible use-after-free references when swapping ids in threaded processes. "Do I have the right creds?" checks are always made with the threads creds. Inspired by FreeBSD and NetBSD "right time" deraadt@
2014-03-30Eliminates struct pcred by moving the real and saved ugids intoPhilip Guenther
struct ucred; struct process then directly links to the ucred Based on a discussion at c2k10 or so before noting that FreeBSD and NetBSD did this too. ok matthew@
2014-03-26Simply cansignal(), passing it processes instead of procs andPhilip Guenther
dropping the pcred argument. Fix handling of kill(-1, sig) from a thread other than the original thread. ok deraadt@
2014-03-26Move p_emul and p_sigcode from proc to process.Philip Guenther
Tweak the handling of ktrace EMUL when changing ktracing: only generate one per process (not one per thread) and pass the correct proc pointer down to the VFS layer. Permit generating of NAMI and CSW records inside ktrace(2) itself. ok deraadt@ millert@
2014-03-24The kernel isn't involved in times(3); <sys/times.h> should never bePhilip Guenther
included there
2014-03-22Move p_sigacts from struct proc to struct process.Philip Guenther
testing help mpi@
2014-02-09Fix the lock order reversal problem in the code that stops tracedMark Kettenis
multi-threaded processes when they receive a signal: 1. Make the parent of the process (the tracer) wait for all threads to be stopped (in wait4(2)) instead of the thread that received the signal. This prevents us from calling tsleep(9) recursively. 2. Assume that we already hold the kernel lock if the P_SINTR flag is set (just like we already assumed we were holding the scheduler lock) and don't try to grab it again. This should fix the panic that many people reported when debugging multi-threaded programs with gdb(1). ok & lots of help from guenther@
2014-01-21bzero -> memsetTed Unangst
2014-01-20Threads can't be zombies, only processes, so change zombproc to zombprocess,Philip Guenther
make it a list of processes, and change P_NOZOMBIE and P_STOPPED from thread flags to process flags. Add allprocess list for the code that just wants to see processes. ok tedu@
2013-10-08Fix delivery of SIGPROF and SIGVTALRM to threaded processes by havingPhilip Guenther
hardclock() set a flag on the running thread and force AST processing, and then have the thread signal itself from userret(). idea and flag names from FreeBSD ok jsing@
2013-10-08If a thread sends a signal to its own process, then have that threadPhilip Guenther
take the signal by preference if it's eligible (unblocked or sigwaiting). ok jsing@
2013-10-06Tweak commentPhilip Guenther
2013-06-01some small style changes that are distracting me from seeing a real bugTed Unangst
2013-04-29Extend P_SIGSUSPEND handling in userret() to properly restore theMatthew Dempsky
sigmask even if there are no pending signals under the temporary sigmask. Refactor existing select() and poll() system calls to introduce the pselect() and ppoll() system calls. Add rthread wrappers for pselect() and ppoll(). While there, update cancellation point comments to reflect recent fdatasync() addition. Minor bumps for libc and librthread due to new symbols. ok guenther, millert, deraadt, jmc
2013-04-06i missed a file, crap. found by deraadtTed Unangst
2013-03-28do not include machine/cpu.h from a .c file; it is the responsibility ofTheo de Raadt
.h files to pull it in, if needed ok tedu
2013-02-08Insufficient levels of hops in the local brew led to Theo and I muckingPhilip Guenther
up the VFS calls in the error paths in coredump() Pointed out by armani@, ok beck@
2013-01-15Allow SIGKILL to terminate coredumping processes. Semantics decidedTheo de Raadt
with kettenis guenther and beck. ok guenther
2013-01-15Slice & dice coredump write requests into MAXPHYS blocks, andTheo de Raadt
yield between operations. Re-grab the vnode every operation, so that multiple coredumps can be saved at the same time. ok guenther beck etc
2012-12-02Determine whether we're currently on the alternative signal stackPhilip Guenthe
dynamically, by comparing the stack pointer against the altstack base and size, so that you get the correct answer if you longjmp out of the signal handler, as tested by regress/sys/kern/stackjmp/. Also, fix alt stack handling on vax, where it was completely broken. Testing and corrections by miod@, krw@, tobiasu@, pirofti@
2012-10-17If a thread calls __threxit() or _exit() immediately after anotherPhilip Guenthe
thread coredumps, the former thread needs to be released by the later single_thread_set(SINGLE_EXIT) call, even though its P_WEXIT flag is set. ok kettenis@
2012-07-11exit1(EXIT_THREAD) needs to call single_thread_check() so that itPhilip Guenthe
can be suspended and/or decrement pr->ps_singlecount if necessary. With that added, the call the other direction needs to use its own flag (EXIT_THREAD_NOCHECK) to avoid looping. problem diagnosed from a hang naddy@ hit; ok kettenis@
2012-06-06EVFILT_SIGNAL and EVFILT_PROC events need to track the process they'rePhilip Guenthe
attached to and not just the thread, which can go away. Problem observed by jsg@; ok jsg@ matthew@
2012-04-13First stab at making ptrace(2) usable for debugging multi-threaded programs.Mark Kettenis
It implements a full-stop model where all threads are stopped before handing over control to the debugger. Events are reported as before through wait(2); you will have to call ptrace(PT_GET_PROCESS_STATE, ...) to find out which thread hit the event. Since this changes the size of struct ptrace_state, you will have to recompile gdb. ok guenther@
2012-04-12move accounting flags to struct process; idea and ok guentherMike Belopuhov
2012-04-11Move the P_WAITED flag from struct proc to struct process.Mark Kettenis
ok guenther@
2012-03-23Make rusage totals, itimers, and profile settings per-process insteadPhilip Guenthe
of per-rthread. Handling of per-thread tick and runtime counters inspired by how FreeBSD does it. ok kettenis@
2012-03-19Add tracing and dumping of "pointer to struct" syscall arguments forPhilip Guenthe
structs timespec, timeval, sigaction, and rlimit. ok otto@ jsing@
2012-03-10Give sigwait priority over ptrace to avoid panicPhilip Guenthe
2012-03-10Add PS_EXITING to better differentiate between the process exiting andPhilip Guenthe
the main thread exiting. c.f. regress/sys/kern/main-thread-exited/
2012-02-20First steps for making ptrace work with rthreads:Philip Guenthe
- move the P_TRACED and P_INEXEC flags, and p_oppid, p_ptmask, and p_ptstat member from struct proc to struct process - sort the PT_* requests into those that take a PID vs those that can also take a TID - stub in PT_GET_THREAD_FIRST and PT_GET_THREAD_NEXT ok kettenis@
2012-01-25A signal handled by __thrsigdivert() shouldn't be marked pendingPhilip Guenthe
for the thread handling it. Otherwise (i.e., no sig divert), prefer to deliver a process-aimed signal to some thread which doesn't have the signal blocked. ok tedu@
2012-01-17Reimplement mutexes, condvars, and rwlocks to eliminate bugs,Philip Guenthe
particularly the "consume the signal you just sent" hang, and putting the wait queues in userspace. Do cancellation handling in pthread_cond_*wait(), pthread_join(), and sem_wait(). Add __ prefix to thr{sleep,wakeup,exit,sigdivert}() syscalls; add 'abort" argument to thrsleep to close cancellation race; make thr{sleep,wakeup} return errno values via *retval to avoid touching userspace errno.
2011-12-11Suspend other rthreads before dumping core or execing; make them exitPhilip Guenthe
when exec succeeds. ok jsing@
2011-11-22Move struct proc's sigaltstack struct from the zeroed area into theJoshua Elsasser
copied area, and initialize it properly in the FORK_THREAD case. This restores the behavior of a forked process inheriting its parent's signal stack. ok guenther@
2011-11-16Make userret() MI. On architectures which jammed stuff into it in theTheo de Raadt
past, pull that code out seperately. ok guenther miod
2011-11-09Change fork1() and kthread_create() to match the rest of the treePhilip Guenthe
and use curp vs p instead of p1 vs p2. Add curpr and pr variables for the respective struct processes. Make sigactsshare() return the shared sigacts intead of taking the struct proc to update. ok deraadt@
2011-09-20MD trap() passes a MD "traptype" and siginfo-style "code" up to the MITheo de Raadt
layers. Then things get terribly confusing because the various MI layers swap variable names for parameters, local variables, and structure fields numerous times. Unconfuse all this mess. Note that exec_elf.c coredump cpi_sigcode used to contain the MD traptype but will now contain the MI siginfo-style "code" value. ok miod kettenis pirofti
2011-07-11Revert art@'s moving around of the KERNEL_LOCK()/KERNEL_UNLOCK() calls,Philip Guenthe
as it causes hangs in some ports, including libsigsegv's configure script confirmed by krw@, landry@
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