Andrey Vagin
84c751bd4a
ptrace: add ability to retrieve signals without removing from a queue (v4) ...
This patch adds a new ptrace request PTRACE_PEEKSIGINFO.
This request is used to retrieve information about pending signals
starting with the specified sequence number. Siginfo_t structures are
copied from the child into the buffer starting at "data".
The argument "addr" is a pointer to struct ptrace_peeksiginfo_args.
struct ptrace_peeksiginfo_args {
u64 off; /* from which siginfo to start */
u32 flags;
s32 nr; /* how may siginfos to take */
};
"nr" has type "s32", because ptrace() returns "long", which has 32 bits on
i386 and a negative values is used for errors.
Currently here is only one flag PTRACE_PEEKSIGINFO_SHARED for dumping
signals from process-wide queue. If this flag is not set, signals are
read from a per-thread queue.
The request PTRACE_PEEKSIGINFO returns a number of dumped signals. If a
signal with the specified sequence number doesn't exist, ptrace returns
zero. The request returns an error, if no signal has been dumped.
Errors:
EINVAL - one or more specified flags are not supported or nr is negative
EFAULT - buf or addr is outside your accessible address space.
A result siginfo contains a kernel part of si_code which usually striped,
but it's required for queuing the same siginfo back during restore of
pending signals.
This functionality is required for checkpointing pending signals. Pedro
Alves suggested using it in "gdb" to peek at pending signals. gdb already
uses PTRACE_GETSIGINFO to get the siginfo for the signal which was already
dequeued. This functionality allows gdb to look at the pending signals
which were not reported yet.
The prototype of this code was developed by Oleg Nesterov.
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Cc: Roland McGrath <roland@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages@gmail.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pedro Alves <palves@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-04-30 17:04:05 -07:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-04-30 08:15:40 -07:00
KGDB/KDB fixes and cleanups
2013-03-02 08:31:39 -08:00
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-04-30 07:41:01 -07:00
kernel/gcov: remove depends on CONFIG_EXPERIMENTAL
2013-01-11 11:39:33 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
Driver core patches for 3.9-rc1
2013-02-21 12:05:51 -08:00
workqueue: include workqueue info when printing debug dump of a worker task
2013-04-30 17:04:02 -07:00
clockevents: Set dummy handler on CPU_DEAD shutdown
2013-04-25 13:57:04 +02:00
Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-04-30 07:41:01 -07:00
kernel/hz.bc: ignore.
2013-04-22 07:09:06 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
async: rename and redefine async_func_ptr
2013-03-12 13:59:14 -07:00
audit: don't check if kauditd is valid every time
2013-04-29 15:54:26 -07:00
audit: remove unnecessary #if CONFIG_AUDIT
2013-04-29 15:54:26 -07:00
kernel/audit_tree.c: tree will leak memory when failure occurs in audit_trim_trees()
2013-04-29 15:54:26 -07:00
audit: catch possible NULL audit buffers
2013-01-11 14:54:55 -08:00
kernel/auditfilter.c: tree and watch will memory leak when failure occurs
2013-04-29 15:54:26 -07:00
kernel/auditsc.c: use kzalloc instead of kmalloc+memset
2013-04-29 15:54:26 -07:00
Add file_ns_capable() helper function for open-time capability checking
2013-04-14 10:06:31 -07:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-04-30 07:43:28 -07:00
cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()
2012-11-19 08:13:38 -08:00
kernel/compat.c: make do_sysinfo() static
2013-04-30 17:04:03 -07:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-02-19 18:19:48 -08:00
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-02-19 19:04:55 -08:00
Merge branch 'for-3.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2013-04-29 19:14:20 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace
2012-12-18 10:55:28 -08:00
cputime: Use accessors to read task cputime stats
2013-01-27 19:23:31 +01:00
Revert "lockdep: check that no locks held at freeze time"
2013-03-31 11:38:33 -07:00
extable: Flip the sorting message
2013-04-15 13:25:16 +02:00
Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-04-30 07:43:28 -07:00
freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()
2012-10-26 14:27:49 -07:00
futex: fix kernel-doc notation and spello
2013-03-12 20:42:10 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal
2013-02-23 18:50:11 -08:00
Merge branch 'linus' into timers/core
2013-04-24 20:33:54 +02:00
Merge branch 'nohz/printk-v8' into irq/core
2013-02-05 00:48:46 +01:00
kcmp: include linux/ptrace.h
2012-12-20 17:40:19 -08:00
kexec, vmalloc: export additional vmalloc layer information
2013-04-29 15:54:34 -07:00
Merge branch 'master' into for-3.9-async
2013-01-23 09:31:01 -08:00
kprobes: Fix a double lock bug of kprobe_mutex
2013-04-18 08:58:38 -07:00
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2012-12-11 18:10:49 -08:00
kthread: implement probe_kthread_data()
2013-04-30 17:04:02 -07:00
lockdep: Consolidate bug messages into a single print_lockdep_off() function
2013-04-26 08:37:22 +02:00
lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()
2012-10-24 12:39:09 +02:00
idle: Provide a generic entry point for the idle code
2013-04-08 17:39:23 +02:00
MODSIGN: Avoid using .incbin in C source
2012-12-14 13:06:44 +10:30
keys: use keyring_alloc() to create module signing keyring
2012-12-20 17:40:21 -08:00
MODSIGN: Move the magic string to the end of a module and eliminate the search
2012-10-19 17:30:40 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
MODSIGN: Don't use enum-type bitfields in module signature info block
2012-12-05 11:27:24 +10:30
mutex: Back out architecture specific check for negative mutex count
2013-04-19 09:33:36 +02:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
padata: use __this_cpu_read per-cpu helper
2012-12-06 17:16:23 +08:00
dump_stack: implement arch-specific hardware description in task dumps
2013-04-30 17:04:02 -07:00
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
pid: Handle the exit of a multi-threaded init.
2013-03-26 03:41:23 -07:00
Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-02-19 19:05:45 -08:00
posix-timers: Remove unused variable
2013-04-18 12:51:19 +02:00
workqueue: include workqueue info when printing debug dump of a worker task
2013-04-30 17:04:02 -07:00
profiling: Remove unused timer hook
2013-01-24 15:37:26 +01:00
ptrace: add ability to retrieve signals without removing from a queue (v4)
2013-04-30 17:04:05 -07:00
kernel/range.c: subtract_range: fix the broken phrase issued by printk
2013-04-30 17:04:01 -07:00
rcu: Provide RCU CPU stall warnings for tiny RCU
2013-01-28 22:06:21 -08:00
Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD
2013-01-28 22:25:21 -08:00
Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD
2013-01-28 22:25:21 -08:00
rcu: Provide RCU CPU stall warnings for tiny RCU
2013-01-28 22:06:21 -08:00
rcu: Allow rcutorture to be built at low optimization levels
2013-02-04 12:18:20 -08:00
Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2013-04-30 07:39:01 -07:00
Merge branches 'doc.2013.03.12a', 'fixes.2013.03.13a' and 'idlenocb.2013.03.26b' into HEAD
2013-03-26 08:07:38 -07:00
Merge branches 'doc.2013.03.12a', 'fixes.2013.03.13a' and 'idlenocb.2013.03.26b' into HEAD
2013-03-26 08:07:38 -07:00
rcu: Make RCU_FAST_NO_HZ take advantage of numbered callbacks
2013-03-26 08:04:51 -07:00
new helper: file_inode(file)
2013-02-22 23:31:31 -05:00
res_counter: return amount of charges after res_counter_uncharge()
2012-12-18 15:02:12 -08:00
mem hotunplug: fix kfree() of bootmem memory
2013-04-29 15:54:40 -07:00
sched/rt: Move rt specific bits into new header file
2013-02-07 20:51:08 +01:00
locking/rtmutex/tester: Set correct permissions on sysfs files
2013-04-10 14:48:37 +02:00
sched/rt: Move rt specific bits into new header file
2013-02-07 20:51:08 +01:00
lockdep, rwsem: provide down_write_nest_lock()
2013-01-11 14:54:55 -08:00
seccomp: Make syscall skipping and nr changes more consistent
2012-10-02 21:14:29 +10:00
arc, print-fatal-signals: reduce duplicated information
2013-04-30 17:04:02 -07:00
kernel/smp.c: cleanups
2013-04-30 17:04:03 -07:00
kthread: Prevent unpark race which puts threads on the wrong cpu
2013-04-12 14:18:43 +02:00
kernel/smp.c: remove 'priv' of call_single_data
2013-04-30 17:04:03 -07:00
srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()
2013-02-07 15:19:36 -08:00
stop_machine: Mark per cpu stopper enabled early
2013-02-26 22:25:17 +01:00
kernel/timer.c: move some non timer related syscalls to kernel/sys.c
2013-04-30 17:04:03 -07:00
module: add syscall to load module from fd
2012-12-14 13:05:22 +10:30
mm: replace hardcoded 3% with admin_reserve_pages knob
2013-04-29 15:54:36 -07:00
sysctl: fix null checking in bin_dn_node_address()
2013-02-27 19:10:21 -08:00
taskstats: cgroupstats_user_cmd() may leak on error
2012-10-06 03:05:31 +09:00
kernel/: rename random32() to prandom_u32()
2013-04-29 18:28:42 -07:00
timekeeping: Use inject_offset in warp_clock
2013-03-15 16:50:20 -07:00
kernel: Replace timeconst.pl with a bc script
2013-02-16 23:17:25 +01:00
kernel/timer.c: move some non timer related syscalls to kernel/sys.c
2013-04-30 17:04:03 -07:00
Tracing updates for Linux 3.10
2013-04-29 13:55:38 -07:00
cputime: Use accessors to read task cputime stats
2013-01-27 19:23:31 +01:00
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
userns: Restrict when proc and sysfs can be mounted
2013-03-27 07:50:08 -07:00
userns: Changing any namespace id mappings should require privileges
2013-04-14 18:11:32 -07:00
kernel/utsname.c: fix wrong comment about clone_uts_ns()
2013-02-27 19:10:22 -08:00
kernel/utsname_sysctl.c: put get/get_uts() into CONFIG_PROC_SYSCTL code block
2013-02-27 19:10:22 -08:00
propagate name change to comments in kernel source
2012-12-06 10:39:54 +01:00
watchdog: Add comments to explain the watchdog_disabled variable
2013-03-14 08:24:05 +01:00
workqueue: include workqueue info when printing debug dump of a worker task
2013-04-30 17:04:02 -07:00
workqueue: include workqueue info when printing debug dump of a worker task
2013-04-30 17:04:02 -07:00
84c751bd4a