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First pass at 2.6.36-rc1

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Kyle McMartin 2010-08-17 16:06:35 -04:00
commit da80d72ece
26 changed files with 262 additions and 14138 deletions
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@ -1,348 +1,5 @@
From c2f1645ae87d5b7fc5e5973c3a93a4ae1684a76b Mon Sep 17 00:00:00 2001
From: Kyle McMartin <kyle@dreadnought.i.jkkm.org>
Date: Tue, 22 Jun 2010 11:31:13 +0100
Subject: Merge remote branch 'utrace/utrace-ptrace' into rawhide
% git log --oneline --no-merges 7e27d6e..a91f6b7
f979955 utrace-ptrace: fix compiling ptrace_regset under CONFIG_UTRACE
b5f196b utrace-ptrace: copy PTRACE_GETREGSET code to utrace-ptrace
d83135e utrace: fix utrace_maybe_reap() vs find_matching_engine() race
9a2c607 utrace: move CONFIG_UTRACE after AUDITSYSCALL in init/Kconfig
62f4621 utrace: s/rmb/mb/ in tracehook_notify_resume()
65f5e9d utrace: fix utrace_maybe_reap logic
ed1f9c2 utrace: fix syntax nit for !CONFIG_UTRACE
71e3f39 ptrace: add utrace comment
e7afc73 utrace: use WARN with text
a8ced33 utrace: cosmetic restructure
4330b80 utrace: remove some inline keywords
d4be40a utrace: remove report_clone special priority for utrace_attach_task on child
8c56566 ptrace: updates for utrace API changes
1900135 utrace: streamline callback API
97662d3 utrace: more cosmetic trivia
fd414cd utrace: more cosmetic cleanup
f30f068 utrace: cosmetic trivia
cfebda7 utrace: fix the comments about rmb() in task_utrace_struct()
875858a utrace: improve the comment in tracehook_notify_resume()
76b49a5 utrace: fix the ->cloning check in utrace_attach_delay()
e0755bb utrace: kill mb() in tracehook_report_death()
9fdc988 fix __must_check warnings
3e02499 kill suppress_sigtrap()
f872e69 utrace: don't set ->ops = utrace_detached_ops lockless
938482e utrace: fix doc typo
7fae049 utrace: avoid BUG_ON when engine leaves bogus si_signo
71b7a85 utrace: trivial, move CONFIG_UTRACE into "General setup"
9c8dbe0 utrace: reset report action for UTRACE_SYSCALL_RESUMED iteration
4c7514e join PTRACE_EVENT_SYSCALL_XXX states
a8f782e export __ptrace_detach() and do_notify_parent_cldstop()
c3473e1 ptrace_signal: check PT_PTRACED before reporting a signal
b396f5e tracehooks: check PT_PTRACED before reporting the single-step
45667dd tracehooks: kill some PT_PTRACED checks
e8a2f23 ptrace: cleanup ptrace_init_task()->ptrace_link() path
611dab8 kill CONFIG_UTRACE_PTRACE
8d3833e rm kernel/ptrace-common.h
494deb7 export __ptrace_detach(), add "ifndef CONFIG_UTRACE" into ptrace.c
05cb325 (upstream) reorder the code in kernel/ptrace.c
eb10f13 restore the old kernel/ptrace.c
ddcc525 utrace_resume: Avoid finish_resume_report() for UTRACE_RESUME
47852f9 mv kernel/ptrace.c kernel/ptrace-utrace.c
de5a46e utrace: fix UTRACE_SYSCALL_RESUMED nits
3bd4be9 stepping, accommodate to utrace-cleanup changes
679be9e Revert "utrace: synthesize SIGTRAP for single-stepping at syscall-exit"
23ab966 utrace: barrier nits
d3800b8 utrace: tracehook_init_task
64daf14 utrace: task_utrace_struct() barrier
f19442c utrace: synthesize SIGTRAP for single-stepping at syscall-exit
2583b32 utrace: nit for utrace-ptrace
a88b467 ptrace: x86: change syscall_trace_leave() to rely on tracehook when stepping
e01acf4 ptrace: x86: implement user_single_step_siginfo()
462a57b ptrace: change tracehook_report_syscall_exit() to handle stepping
172590d ptrace: powerpc: implement user_single_step_siginfo()
d63b43d ptrace: introduce user_single_step_siginfo() helper
c575558 utrace: barriers for initializing struct utrace
89df3c7 utrace: utrace_attach_task() forgets to return when ->utrace == NULL
4d17e95 utrace: finish_report() must never set ->resume = UTRACE_STOP
212f67e utrace: utrace_get_signal() must check ->pending_attach
eff6ca8 change ptrace_report_signal() to use user_single_step_siginfo()
cba1272 don't send the unnecessary SIGTRAP after SYSCALL_EXIT
8aa71a6 revert "turn PTRACE_EVENT_SIGTRAP into PTRACE_EVENT_SIGNAL"
90c8237 utrace-ptrace: minimally handle UTRACE_SYSCALL_RESUMED
a7e9198 utrace: clean up resume-action handling
962eb2f utrace: update after merge
e2ced71 re-introduce utrace_finish_stop() to fix the race with SIGKILL
603e19c turn PTRACE_EVENT_SIGTRAP into PTRACE_EVENT_SIGNAL
ff87f65 introduce suppress_sigtrap() to prevent unwanted send_sigtrap()
6505e3c move ptrace_resume()->send_sigtrap() logic into ptrace_report_signal()
5261baa prepare ptrace_report_signal() to synthesize SIGTRAP
ef9534b ptrace_request: turn ptrace_resume() into default case
f50c776 s/context/ctx/
228b2e3 ptrace_notify_stop: kill the temporary WARN_ON()
93e866a ptrace_request(PTRACE_KILL) should not(?) return -ESRCH
26fefca utrace: sticky resume action
28b2774b utrace: remove ->stopped field
9e0f357 utrace_set_events: nit clean up
6d0bad3 nits
48bab07 (utrace) utrace_get_signal: don't dequeue_signal() if ->group_stop_count
d4ef551 (upstream) signals: check ->group_stop_count after tracehook_get_signal()
6292daa ptrace_detach_task: don't use valid_signal()
c5a6a82 cosmetic, renames
e422a3f cosmetic, relocate some code in ptrace.c
b96e4db (upstream) introduce kernel/ptrace.h
7665564 (upstream) tracehook_signal_handler: check PT_PTRACED
7d708ca tracehooks: revert utrace-ptrace changes
4104e29 (upstream) ptrace_init_task: cleanup the usage of ptrace_link()
d04ccb7 revert all utrace-ptrace changes in ptrace.h
80786ce revert utrace-ptrace changes in kernel/signal.c
0b02f9e introduce PT_UTRACED to replace PT_PTRACED inside ptrace.c
030ce35 tracehooks: remove some PT_PTRACED checks
4b7b15a revert the clone() related changes in tracehook.h
769030e hack ptrace_check_attach() to make it almost correct
7aa5c3a cosmetic, fold do_ptrace_resume() into ptrace_resume()
d27ebc1 cosmetic, introduce ptrace_resume_action()
35fbca4 turn context->sysemu into PTRACE_O_SYSEMU
38a8c1f PTRACE_SYSEMU_SINGLESTEP support
4367836 PTRACE_SYSEMU support
16819db ptrace_report_clone: minor cleanups + comments
ac1afd8 ptrace_resume: rewrite request processing
6b0d4f6 do_ptrace_resume: always use ptrace_wake_up()
fa92ce3 do_ptrace_resume: consolidate multiple switch stmts
135d780 uglify the code again to report VFORK_DONE after VFORK
4e3f362 fix PTRACE_SYSCALL after PTRACE_EVENT_VFORK_DONE stop
3f95189 ptrace_report_clone: uglify even more to handle TRACEVFORKDONE without TRACEVFORK
66ca8b6 ptrace_report_clone: uglify CLONE_PTRACE/CLONE_UNTRACED behaviour to match upstream
fc82b2c pretend PTRACE_O_TRACEVFORKDONE doesn't exist
28aa15a utrace_set_events: never return -EINPROGRESS unless clearing some event bits
a7f4350 utrace_stop: do ptrace_notify_stop() unconditionally
cb78492 ptrace_report_exit: fix WARN_ON() condition
bb941c3 do_ptrace_notify_stop: document the usage of tracee->exit_code
383ba85 ptrace_wake_up: don't clear tracee->exit_code + update comments
3d5c221 ptrace_wake_up: add "bool force_wakeup" argument for implicit detach
be6862e ptrace_wake_up: clear context->stop_code
bfb40c8 detach: use ptrace_wake_up() instead of utrace_control()
7de148a shift context re-initialization from detach to reuse
464def3 cleanup/optimize reuse/attch in ptrace_attach_task()
50f56b9 ptrace_attach_task: rely on utrace_barrier(), don't check ->ops
03376fd use set_stop_code() in ptrace_report_signal(UTRACE_SIGNAL_HANDLER)
85f8b3a detach should reset the context of self-detaching engine
a27233a attach: try to re-use the self-detaching engine
8667615 ptrace_notify_stop: fix engine leak
3d5d053 ptrace_detach_task: don't use engine ptr before IS_ERR(engine)
01875c7 fold detach_signal() into ptrace_detach_task()
464c2b7 don't detach the engine with the parting signal
97b345c implement the basic detach-with-signal logic
a158247 rework access to context->siginfo
20ea83b introduce set_stop_code() helper
eb222ed cosmetic, misc renames
f83b2ca move "event << 8" into syscall_code()
4c99287 kill context->ev_name
df7c8f2 encode internal stop events in ->ev_code too
3f48297 introduce get_stop_code(context) helper
313bad1 introduce syscall_code(context) helper
47b5e2c don't clear context->ev_code for debugging
4e09fe3 convert ptrace_setsiginfo() to use ptrace_rw_siginfo()
53187be convert ptrace_getsiginfo() to use ptrace_rw_siginfo()
e7ac055 introduce ptrace_rw_siginfo() helper
c625793 move "resume signal" logic into the tracee's context
0768d89 UTRACE_SIGNAL_HANDLER should never see ->siginfo != NULL
e90cb71 don't use task_struct->ptrace_message
842684f do_ptrace_notify_stop: fix the race with SIGKILL
d0ed18d do_ptrace_notify_stop: backport the "sync wakeup" logic
08f4a21 fix the stepping over syscall
a55d174 implement the stacked SYSCALL_EXIT event
ba73824 ptrace_resume: don't ignore "data" argument
fbd4368 kill context->ev_array[]
3c6f822 Revert "ptrace_resume_signal() should use context->siginfo under ->siglock"
ee31432 Revert "UTRACE_SIGNAL_HANDLER should never see ->siginfo != NULL"
a4e5af1 Revert "introduce context_siginfo() helper"
9bc939a revert merge w/s change
6752625 introduce context_siginfo() helper
d43a453 UTRACE_SIGNAL_HANDLER should never see ->siginfo != NULL
e4e48df ptrace_resume_signal() should use context->siginfo under ->siglock
4492770 implement UTRACE_SIGNAL_HANDLER stepping
5f926a5 implement PTRACE_SINGLESTEP/PTRACE_SINGLEBLOCK
8b70ae1 ptrace_request: use ptrace_lookup_engine()
abd580d change ptrace_resume() to have the single "return"
85878ae introduce ptrace_lookup_engine()
74904f1 mv task_struct->last_siginfo ptrace_context->siginfo
2b17f4a pretens ptrace_detach(sig) works
075db41 ptrace_report_quiesce() can't trust fatal_signal_pending()
d583c87 remove the now unneeded code
69a6c83 break ptrace_report_signal()
d6a31ee do_ptrace_notify_stop: kill "->ev_message != 0" check
e194687 convert ptrace_report_exit()
8bf8304 PTRACE_EVENT_VFORK_DONE: set ev_options = PTRACE_O_TRACEVFORKDONE
b8f5e2a make sure PTRACE_SYSCALL reports SYSCALL_EXIT
258b27d make sure PTRACE_CONT "disables" SYSCALL_EXIT report
d26b659 introduce ptrace_event->ev_options
03a0fe3 convert ptrace_report_exec()
bea6139 convert ptrace_report_syscall_entry()
17dd96d cleanup/simplify stop/resume mess
97fc962 utrace: comments
c661ddb utrace: move struct utrace back where it belongs
95dcdee implement stacked stop events
8608da6 ptrace_report_syscall_exit: do not WARN() if killed
95a6b6b ptrace_report_clone: rework the stop/resume logic
25dd723 remove the current PTRACE_EVENT_VFORK_DONE logic
7d8900a ptrace_wake_up: fix the "compatibility bug" logic
9a50d27 ptrace_report_syscall_exit: return UTRACE_STOP, not UTRACE_RESUME
c07370d simplify utrace_add_engine() vs utrace_reap() protection
0f4d918 utrace_add_engine: cleanup
a24e891 fix utrace_reset() vs release_task() theoretical race
dfc0917 change attach/release to avoid unnecessary utrace_reap()
cbed668 utrace_attach_task: do no check ->exit_state
9d114a6 utrace_wakeup: do not check target->state
9368f18 utrace_wakeup: lock ->siglock directly
e9b58e9 convert ptrace_report_syscall_exit() to use ptrace_context
1d47e4d introduce context->resume_stopped()
c34d813 introduce context->stopped_code
b7edb5e introduce ptrace_notify_stop()
93b2e7e utrace_release_task: cosmetic
ac6e19c utrace_reap: loop lockless, do not clear ->ops and ->flags early
7852d10 utrace: slow_path -> pending_attach
c827b15 utrace_add_engine() should set ->utrace_flags |= REAP
2e12892 utrace_reap: fix missing callback
04852f3 utrace: do not force report on attach
37b68f7 kill ptrace_setoptions() and ptrace_update_utrace()
f1b39f3 use context->options instead of "->ptrace & PT_"
d05bf8e ptrace_set_options: use PTRACE_O_ instead of PT_
167b56a "disable" tracehook_prepare_clone()
5e526f3 introduce ptrace_set_options()
4a50ac1 introduce ptrace_context->options
0457aa8 introduce the empty struct ptrace_context
a2bca6f utrace_reset: do not use "unsafe mode"
eac91f4 utrace_control: don't mark_engine_detached() before engine_wants_stop()
c2916fb utrace_control: fix utrace_reset(safe) usage when ->exit_state != 0
c36a311 utrace_reset fix
8d2fc04 utrace: remove unused inline
64a8ca3 utrace_reset cleanup
d1a14ce utrace: change UTRACE_STOP bookkeeping
96fe3cc Revert "utrace_stop: fix UTRACE_DETACH race"
ceaae71 utrace: check QUIESCE before reporting UTRACE_SIGNAL_REPORT/HANDLER
fc30d20 utrace_do_stop: move "if (exit_state)" logic to the caller
9b655f7 utrace_do_stop: don't set ->stopped when ->exit_state
9ed6a39 utrace_set_events: never return -EINPROGRESS on a zombie
592d977 utrace_do_stop: cleanup the usage of ->siglock
7f51e58 utrace: fix utrace->signal_handler "leakage"
be5e266 utrace: utrace_finish_vfork: check ->vfork_stop lockless
c3580f1 utrace-ptrace: fix conditions in ptrace_do_detach
00932db utrace_stop: fix UTRACE_DETACH race
b032859 utrace: move utrace_stop down
a62ed15 utrace: consolidate utrace_reset callers
c8315d3 ptrace_do_detach: Fiddle code to avoid warnings.
e3635f1 utrace-ptrace: use WARN_ON(), suppress __must_check warning
8ba59d7 ptrace_attach_task: kill ->ptrace != 0 check
a18378e exit_ptrace: use ptrace_do_detach()
371c69c ptrace_detach: do ptrace_unlink() first
096f3ed ptrace_detach: kill the unconditional wakeup
d999521 ptrace_report_clone: rework auto-attaching
8cefebf move ->ptrace == 0 checks to ptrace_attach_task()
471d6f4 utrace_engine_ops: add release hook
78ca7e7 utrace_control: return -EINVAL for missing UTRACE_EVENT(QUIESCE)
fcb8fa0 change ptrace_traceme() to use the new helpers, kill prepare/finish attach
e82feff rework prepare_ptrace_attach/finish_ptrace_attach
3bea38f do not use engine->data
57cedd0 ptrace_detach_task: always do UTRACE_DETACH
2093f3a shift ptrace_utrace_exit() from tracehook_report_exit() to exit_ptrace()
33fb930 ptrace_resume()->send_sig() can crash
a7b05fd ptrace_check_attach: check child->parent
5ed4eff remove (almost all) !CONFIG_UTRACE_PTRACE code
fb9379c change utrace_stop() to return void
5bbbb41 kill utrace_report->killed
0b57f74 finish_utrace_stop: use __fatal_signal_pending(), dont take ->siglock
113a07e utrace: rework finish_report flag logic
8ad60bb utrace_stop: preserve report/interrupt requests across stop/resume
af3eb44 get_utrace_lock: do not check EXIT_DEAD
d87e8c4 finish_utrace_stop: check ->stopped lockless
3e0a686 utrace_report_jctl/utrace_get_signal: do not play with ->stopped
7d97118 utrace_do_stop: s/STOPPED/TRACED/ to protect against SIGCONT
ad2497a use tracehook_finish_jctl() to clear ->stopped
f99db9f utrace_report_jctl: do not play with the group-stop state
fd89498 introduce tracehook_finish_jctl() helper
ff6be89 do_signal_stop: do not call tracehook_notify_jctl() in TASK_STOPPED state
66e0705 utrace_stop: don't forget about SIGNAL_STOP_STOPPED
2edad7d utrace_wakeup: take ->group_stop_count into account
d4bcb57 utrace_reap: clear engine->flags when finishing detach
cf890ad utrace: fix utrace->reporting left set for no callback
cbe5188 More than one user has hit the -EEXIST problem when using utrace_attach_task and UTRACE_ATTACH_EXCLUSIVE without UTRACE_ATTACH_MATCH_DATA|_OPS. Document that a bit more.
52db080 UTRACE_SYSCALL_RESUMED repeat callback
5e67e22 utrace docbook: s/first/last/ braino
4bd78f8 utrace: reverse engine callback order for report_syscall_entry
1757088 utrace: WARN instead of BUG on misuse of UTRACE_*STEP without arch_has_*_step() check
5d4e97b utrace: restore tracehook_report_death comment misplaced in merges
cb49dcd utrace_report_syscall_entry: remove unnecessary recalc_sigpending() check
c0909b5 utrace_resume: fix potential TIF_SIGPENDING race
f0a1c64 utrace: use \t separator in /proc/pid/status
13a5838 utrace: init_task syntax nit
715d2a1 utrace: cosmetic
42de707 utrace_report_jctl: do splice_attaching
622013d utrace_resume: remove racy BUG_ON
282d685 whitespace fix
bec92f8 signals: tracehook_notify_jctl change
a7181aa utrace: simplify death report condition
4d8a6fd utrace: barrier between TIF_NOTIFY_RESUME check and utrace_flags/utrace->report checks
ae3096f utrace-ptrace: remove unsafe_exec and tracer_task hooks
325fecc utrace: get rid of tracer_task and unsafe_exec hooks
0084fc2 utrace: ensure UTRACE_REPORT callback return leads to callback after utrace_stop
5bdc6f1 utrace: cosmetic: DEAD_FLAGS_MASK macro
5c5bdbe utrace: cosmetic: _UTRACE_DEATH_EVENTS macro
f067223 utrace: make sure utrace_flags is nonzero before set_notify_resume at attach
e2d293e utrace: drop racy unlocked check in utrace_do_stop
68f3899 utrace: fix ->report_jctl @notify argument
c743327 utrace: avoid unnecessary list_for_each_safe
acd516b utrace_stop: trivial, kill the unnecessary assignment
81ed517 utrace_add_engine: add missing 'else' after 'if (utrace->reap)'
215a076 utrace: tracehook.h comment
a584c66 utrace: fix utrace_attach_delay() creator test
827ec3b utrace: comment ->reporting implementation
07732b4 utrace-ptrace: handle -ERESTARTNOINTR from utrace_attach_task
2233b06 utrace: finish utrace_reap conversion after indirect->direct struct utrace
dd30e86 utrace: fix utrace_attach_delay() to loop, remove struct utrace.cloning field
be4f357 get_utrace_lock: kill the bogus engine->kref.refcount check
c367207 utrace: clear struct in utrace_init_task
94f168c utrace: define UTRACE_API_VERSION
742f120 utrace: place struct utrace directly in task_struct
cb25a58 utrace: comment fixes
2b834a5 utrace-ptrace: struct utrace_attached_engine -> struct utrace_engine
6b8306a utrace: struct utrace_attached_engine -> struct utrace_engine
9fe3bac utrace-ptrace: Kconfig doc update
5bb0052 utrace: cosmetic changes
556a7e7 utrace-ptrace: fix resuming with blocked signal
3a9f4c8 utrace: order utrace_control() after callback return value processing
269150d Cosmetic reorganization to further simplify utrace pointer vs embedded-struct.
ea30176 Use task_utrace_struct() helper in utrace_interrupt_pending().
ed2098a Use task_utrace_struct() helper
97d5cde cosmetic code reorganization
4e8a7ca Remove UTRACE_DEBUG hacks
25fb674 utrace: exclude PTRACE_TRACEME
f286be7 utrace-ptrace: remove utrace_engine_put stub
e0c36bd Disable mutual exclusion if CONFIG_UTRACE_PTRACE
c93d704 utrace/ptrace mutual exclusion
594f22c cond_resched() before race-restart in utrace_attach_task
0da72f3 Clean up utrace_attach_task code.
fd3d457 utrace: ptrace cooperation
f357a74 utrace core
---
Documentation/DocBook/Makefile | 2 +-
Documentation/DocBook/utrace.tmpl | 590 +++++++++
fs/proc/array.c | 3 +
include/linux/ptrace.h | 3 +-
include/linux/sched.h | 6 +
include/linux/tracehook.h | 97 ++-
include/linux/utrace.h | 692 +++++++++++
init/Kconfig | 9 +
kernel/Makefile | 2 +
kernel/fork.c | 3 +
kernel/ptrace-utrace.c | 1127 +++++++++++++++++
kernel/ptrace.c | 620 +++++-----
kernel/signal.c | 4 +-
kernel/utrace.c | 2452 +++++++++++++++++++++++++++++++++++++
14 files changed, 5291 insertions(+), 319 deletions(-)
create mode 100644 Documentation/DocBook/utrace.tmpl
create mode 100644 include/linux/utrace.h
create mode 100644 kernel/ptrace-utrace.c
create mode 100644 kernel/utrace.c
diff --git a/Documentation/DocBook/Makefile b/Documentation/DocBook/Makefile
index c7e5dc7..e63f889 100644
index 34929f2..884c36b 100644
--- a/Documentation/DocBook/Makefile
+++ b/Documentation/DocBook/Makefile
@@ -14,7 +14,7 @@ DOCBOOKS := z8530book.xml mcabook.xml device-drivers.xml \
@ -356,10 +13,10 @@ index c7e5dc7..e63f889 100644
# The build process is as follows (targets):
diff --git a/Documentation/DocBook/utrace.tmpl b/Documentation/DocBook/utrace.tmpl
new file mode 100644
index 0000000..e149f49
index 0000000..0c40add
--- /dev/null
+++ b/Documentation/DocBook/utrace.tmpl
@@ -0,0 +1,590 @@
@@ -0,0 +1,589 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
+"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd" []>
@ -719,13 +376,12 @@ index 0000000..e149f49
+ after a successful call, no event callbacks not requested in the new
+ flags will be made. It fails with <constant>-EALREADY</constant> if
+ you try to clear <constant>UTRACE_EVENT(DEATH)</constant> when the
+ <function>report_death</function> callback may already have begun, if
+ you try to clear <constant>UTRACE_EVENT(REAP)</constant> when the
+ <function>report_reap</function> callback may already have begun, or if
+ <function>report_death</function> callback may already have begun, or if
+ you try to newly set <constant>UTRACE_EVENT(DEATH)</constant> or
+ <constant>UTRACE_EVENT(QUIESCE)</constant> when the target is already
+ dead or dying. Like <function>utrace_control</function>, it returns
+ <constant>-ESRCH</constant> when the thread has already been detached
+ <constant>-ESRCH</constant> when the <function>report_reap</function>
+ callback may already have begun, or the thread has already been detached
+ (including forcible detach on reaping). This lets the tracing engine
+ know for sure which event callbacks it will or won't see after
+ <function>utrace_set_events</function> has returned. By checking for
@ -951,7 +607,7 @@ index 0000000..e149f49
+
+</book>
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 9b58d38..c7c7881 100644
index fff6572..a67bd83 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -81,6 +81,7 @@
@ -991,10 +647,10 @@ index 4272521..235c1b0 100644
extern void ptrace_disable(struct task_struct *);
extern int ptrace_check_attach(struct task_struct *task, int kill);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index f118809..d3fef7a 100644
index ce160d6..66a1ec8 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1348,6 +1348,11 @@ struct task_struct {
@@ -1339,6 +1339,11 @@ struct task_struct {
#endif
seccomp_t seccomp;
@ -1006,7 +662,7 @@ index f118809..d3fef7a 100644
/* Thread group tracking */
u32 parent_exec_id;
u32 self_exec_id;
@@ -2033,6 +2038,7 @@ extern int kill_pgrp(struct pid *pid, int sig, int priv);
@@ -2030,6 +2035,7 @@ extern int kill_pgrp(struct pid *pid, int sig, int priv);
extern int kill_pid(struct pid *pid, int sig, int priv);
extern int kill_proc_info(int, struct siginfo *, pid_t);
extern int do_notify_parent(struct task_struct *, int);
@ -1975,12 +1631,12 @@ index 0000000..f251efe
+
+#endif /* linux/utrace.h */
diff --git a/init/Kconfig b/init/Kconfig
index 5cff9a9..c0b7f81 100644
index 2de5b1c..a283086 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -328,6 +328,15 @@ config AUDIT_TREE
@@ -332,6 +332,15 @@ config AUDIT_TREE
depends on AUDITSYSCALL
select INOTIFY
select FSNOTIFY
+config UTRACE
+ bool "Infrastructure for tracing and debugging user processes"
@ -1995,7 +1651,7 @@ index 5cff9a9..c0b7f81 100644
choice
diff --git a/kernel/Makefile b/kernel/Makefile
index 057472f..dfdc01c 100644
index 0b72d1a..b09c9a5 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -70,6 +70,8 @@ obj-$(CONFIG_IKCONFIG) += configs.o
@ -2004,11 +1660,11 @@ index 057472f..dfdc01c 100644
obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
+obj-$(CONFIG_UTRACE) += utrace.o
+obj-$(CONFIG_UTRACE) += ptrace-utrace.o
obj-$(CONFIG_AUDIT) += audit.o auditfilter.o audit_watch.o
obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
obj-$(CONFIG_GCOV_KERNEL) += gcov/
obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
diff --git a/kernel/fork.c b/kernel/fork.c
index b6cce14..ac4a6ec 100644
index 98b4508..3ceff6f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -161,6 +161,7 @@ void free_task(struct task_struct *tsk)
@ -2019,7 +1675,7 @@ index b6cce14..ac4a6ec 100644
free_task_struct(tsk);
}
EXPORT_SYMBOL(free_task);
@@ -1007,6 +1008,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
@@ -1008,6 +1009,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
if (!p)
goto fork_out;
@ -2030,10 +1686,10 @@ index b6cce14..ac4a6ec 100644
rt_mutex_init_task(p);
diff --git a/kernel/ptrace-utrace.c b/kernel/ptrace-utrace.c
new file mode 100644
index 0000000..86234ee
index 0000000..1a8ba5e
--- /dev/null
+++ b/kernel/ptrace-utrace.c
@@ -0,0 +1,1127 @@
@@ -0,0 +1,1125 @@
+/*
+ * linux/kernel/ptrace.c
+ *
@ -2086,8 +1742,6 @@ index 0000000..86234ee
+ child->ptrace = 0;
+ child->parent = child->real_parent;
+ list_del_init(&child->ptrace_entry);
+
+ arch_ptrace_untrace(child);
+}
+
+struct ptrace_context {
@ -3162,7 +2816,7 @@ index 0000000..86234ee
+}
+#endif /* CONFIG_COMPAT */
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 74a3d69..c77f9bf 100644
index f34d798..daed9e8 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -23,7 +23,317 @@
@ -3417,7 +3071,7 @@ index 74a3d69..c77f9bf 100644
+ out:
+ return ret;
+}
+
+int generic_ptrace_peekdata(struct task_struct *tsk, long addr, long data)
+{
+ unsigned long tmp;
@ -3478,7 +3132,7 @@ index 74a3d69..c77f9bf 100644
+ return ret;
+}
+#endif /* CONFIG_COMPAT */
+
+#ifndef CONFIG_UTRACE
/*
* ptrace a task: make the debugger its new parent and
@ -3537,10 +3191,47 @@ index 74a3d69..c77f9bf 100644
int ptrace_attach(struct task_struct *task)
{
int retval;
@@ -242,57 +505,6 @@ int ptrace_traceme(void)
return ret;
}
@@ -205,92 +468,41 @@ int ptrace_attach(struct task_struct *task)
send_sig_info(SIGSTOP, SEND_SIG_FORCED, task);
retval = 0;
-unlock_tasklist:
- write_unlock_irq(&tasklist_lock);
-unlock_creds:
- mutex_unlock(&task->cred_guard_mutex);
-out:
- return retval;
-}
-
-/**
- * ptrace_traceme -- helper for PTRACE_TRACEME
- *
- * Performs checks and sets PT_PTRACED.
- * Should be used by all ptrace implementations for PTRACE_TRACEME.
- */
-int ptrace_traceme(void)
-{
- int ret = -EPERM;
-
- write_lock_irq(&tasklist_lock);
- /* Are we already being traced? */
- if (!current->ptrace) {
- ret = security_ptrace_traceme(current->parent);
- /*
- * Check PF_EXITING to ensure ->real_parent has not passed
- * exit_ptrace(). Otherwise we don't report the error but
- * pretend ->real_parent untraces us right after return.
- */
- if (!ret && !(current->real_parent->flags & PF_EXITING)) {
- current->ptrace = PT_PTRACED;
- __ptrace_link(current, current->real_parent);
- }
- }
- write_unlock_irq(&tasklist_lock);
-
- return ret;
-}
-
-/*
- * Called with irqs disabled, returns true if childs should reap themselves.
- */
@ -3563,16 +3254,30 @@ index 74a3d69..c77f9bf 100644
- * If it's a zombie, our attachedness prevented normal parent notification
- * or self-reaping. Do notification now if it would have happened earlier.
- * If it should reap itself, return true.
- *
+unlock_tasklist:
+ write_unlock_irq(&tasklist_lock);
+unlock_creds:
+ mutex_unlock(&task->cred_guard_mutex);
+out:
+ return retval;
+}
+
+/**
+ * ptrace_traceme -- helper for PTRACE_TRACEME
*
- * If it's our own child, there is no notification to do. But if our normal
- * children self-reap, then this child was prevented by ptrace and we must
- * reap it now, in that case we must also wake up sub-threads sleeping in
- * do_wait().
- */
+ * Performs checks and sets PT_PTRACED.
+ * Should be used by all ptrace implementations for PTRACE_TRACEME.
*/
-static bool __ptrace_detach(struct task_struct *tracer, struct task_struct *p)
-{
+int ptrace_traceme(void)
{
- __ptrace_unlink(p);
-
+ int ret = -EPERM;
- if (p->exit_state == EXIT_ZOMBIE) {
- if (!task_detached(p) && thread_group_empty(p)) {
- if (!same_thread_group(p->real_parent, tracer))
@ -3586,17 +3291,29 @@ index 74a3d69..c77f9bf 100644
- /* Mark it as in the process of being reaped. */
- p->exit_state = EXIT_DEAD;
- return true;
- }
- }
-
- return false;
-}
-
int ptrace_detach(struct task_struct *child, unsigned int data)
{
bool dead = false;
@@ -346,56 +558,6 @@ void exit_ptrace(struct task_struct *tracer)
+ write_lock_irq(&tasklist_lock);
+ /* Are we already being traced? */
+ if (!current->ptrace) {
+ ret = security_ptrace_traceme(current->parent);
+ /*
+ * Check PF_EXITING to ensure ->real_parent has not passed
+ * exit_ptrace(). Otherwise we don't report the error but
+ * pretend ->real_parent untraces us right after return.
+ */
+ if (!ret && !(current->real_parent->flags & PF_EXITING)) {
+ current->ptrace = PT_PTRACED;
+ __ptrace_link(current, current->real_parent);
}
}
+ write_unlock_irq(&tasklist_lock);
- return false;
+ return ret;
}
int ptrace_detach(struct task_struct *child, unsigned int data)
@@ -352,56 +564,6 @@ void exit_ptrace(struct task_struct *tracer)
write_lock_irq(&tasklist_lock);
}
-int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len)
@ -3652,7 +3369,7 @@ index 74a3d69..c77f9bf 100644
static int ptrace_setoptions(struct task_struct *child, long data)
{
child->ptrace &= ~PT_TRACE_MASK;
@@ -456,7 +618,6 @@ static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
@@ -462,7 +624,6 @@ static int ptrace_setsiginfo(struct task_struct *child, const siginfo_t *info)
return error;
}
@ -3660,7 +3377,7 @@ index 74a3d69..c77f9bf 100644
#ifdef PTRACE_SINGLESTEP
#define is_singlestep(request) ((request) == PTRACE_SINGLESTEP)
#else
@@ -510,47 +671,6 @@ static int ptrace_resume(struct task_struct *child, long request, long data)
@@ -516,47 +677,6 @@ static int ptrace_resume(struct task_struct *child, long request, long data)
return 0;
}
@ -3708,7 +3425,7 @@ index 74a3d69..c77f9bf 100644
int ptrace_request(struct task_struct *child, long request,
long addr, long data)
{
@@ -666,88 +786,7 @@ int ptrace_request(struct task_struct *child, long request,
@@ -672,88 +792,7 @@ int ptrace_request(struct task_struct *child, long request,
return ret;
}
@ -3797,7 +3514,7 @@ index 74a3d69..c77f9bf 100644
int compat_ptrace_request(struct task_struct *child, compat_long_t request,
compat_ulong_t addr, compat_ulong_t data)
{
@@ -825,42 +864,5 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
@@ -831,42 +870,5 @@ int compat_ptrace_request(struct task_struct *child, compat_long_t request,
return ret;
}
@ -3842,10 +3559,10 @@ index 74a3d69..c77f9bf 100644
#endif /* CONFIG_COMPAT */
+#endif /* CONFIG_UTRACE */
diff --git a/kernel/signal.c b/kernel/signal.c
index 906ae5a..8087f13 100644
index bded651..6d13d9f 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -1518,7 +1518,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
@@ -1521,7 +1521,7 @@ int do_notify_parent(struct task_struct *tsk, int sig)
return ret;
}
@ -3854,7 +3571,7 @@ index 906ae5a..8087f13 100644
{
struct siginfo info;
unsigned long flags;
@@ -1788,7 +1788,7 @@ static int do_signal_stop(int signr)
@@ -1791,7 +1791,7 @@ static int do_signal_stop(int signr)
static int ptrace_signal(int signr, siginfo_t *info,
struct pt_regs *regs, void *cookie)
{
@ -3865,10 +3582,10 @@ index 906ae5a..8087f13 100644
ptrace_signal_deliver(regs, cookie);
diff --git a/kernel/utrace.c b/kernel/utrace.c
new file mode 100644
index 0000000..f5a9e2c
index 0000000..4d61096
--- /dev/null
+++ b/kernel/utrace.c
@@ -0,0 +1,2452 @@
@@ -0,0 +1,2450 @@
+/*
+ * utrace infrastructure interface for debugging user processes
+ *
@ -4099,6 +3816,7 @@ index 0000000..f5a9e2c
+ */
+ list_add_tail(&engine->entry, &utrace->attaching);
+ utrace->pending_attach = 1;
+ utrace_engine_get(engine);
+ ret = 0;
+unlock:
+ spin_unlock(&utrace->lock);
@ -4172,10 +3890,10 @@ index 0000000..f5a9e2c
+ return ERR_PTR(-ENOMEM);
+
+ /*
+ * Initialize the new engine structure. It starts out with two
+ * refs: one ref to return, and one ref for being attached.
+ * Initialize the new engine structure. It starts out with one ref
+ * to return. utrace_add_engine() adds another for being attached.
+ */
+ kref_set(&engine->kref, 2);
+ kref_init(&engine->kref);
+ engine->flags = 0;
+ engine->ops = ops;
+ engine->data = data;
@ -4188,6 +3906,7 @@ index 0000000..f5a9e2c
+ engine = ERR_PTR(ret);
+ }
+
+
+ return engine;
+}
+EXPORT_SYMBOL_GPL(utrace_attach_task);
@ -4292,7 +4011,7 @@ index 0000000..f5a9e2c
+
+ utrace = task_utrace_struct(target);
+ spin_lock(&utrace->lock);
+ if (unlikely(!engine->ops) ||
+ if (unlikely(utrace->reap) || unlikely(!engine->ops) ||
+ unlikely(engine->ops == &utrace_detached_ops)) {
+ /*
+ * By the time we got the utrace lock,
@ -4358,13 +4077,12 @@ index 0000000..f5a9e2c
+ *
+ * This fails with -%EALREADY and does nothing if you try to clear
+ * %UTRACE_EVENT(%DEATH) when the @report_death callback may already have
+ * begun, if you try to clear %UTRACE_EVENT(%REAP) when the @report_reap
+ * callback may already have begun, or if you try to newly set
+ * %UTRACE_EVENT(%DEATH) or %UTRACE_EVENT(%QUIESCE) when @target is
+ * already dead or dying.
+ * begun, or if you try to newly set %UTRACE_EVENT(%DEATH) or
+ * %UTRACE_EVENT(%QUIESCE) when @target is already dead or dying.
+ *
+ * This can fail with -%ESRCH when @target has already been detached,
+ * including forcible detach on reaping.
+ * This fails with -%ESRCH if you try to clear %UTRACE_EVENT(%REAP) when
+ * the @report_reap callback may already have begun, or when @target has
+ * already been detached, including forcible detach on reaping.
+ *
+ * If @target was stopped before the call, then after a successful call,
+ * no event callbacks not requested in @events will be made; if
@ -4395,7 +4113,7 @@ index 0000000..f5a9e2c
+{
+ struct utrace *utrace;
+ unsigned long old_flags, old_utrace_flags;
+ int ret;
+ int ret = -EALREADY;
+
+ /*
+ * We just ignore the internal bit, so callers can use
@ -4410,14 +4128,12 @@ index 0000000..f5a9e2c
+ old_utrace_flags = target->utrace_flags;
+ old_flags = engine->flags & ~ENGINE_STOP;
+
+ if (target->exit_state &&
+ (((events & ~old_flags) & _UTRACE_DEATH_EVENTS) ||
+ (utrace->death &&
+ ((old_flags & ~events) & _UTRACE_DEATH_EVENTS)) ||
+ (utrace->reap && ((old_flags & ~events) & UTRACE_EVENT(REAP))))) {
+ spin_unlock(&utrace->lock);
+ return -EALREADY;
+ }
+ /*
+ * If utrace_report_death() is already progress now,
+ * it's too late to clear the death event bits.
+ */
+ if (((old_flags & ~events) & _UTRACE_DEATH_EVENTS) && utrace->death)
+ goto unlock;
+
+ /*
+ * When setting these flags, it's essential that we really
@ -4429,12 +4145,11 @@ index 0000000..f5a9e2c
+ * knows positively that utrace_report_death() will be called or
+ * that it won't.
+ */
+ if ((events & ~old_utrace_flags) & _UTRACE_DEATH_EVENTS) {
+ if ((events & ~old_flags) & _UTRACE_DEATH_EVENTS) {
+ read_lock(&tasklist_lock);
+ if (unlikely(target->exit_state)) {
+ read_unlock(&tasklist_lock);
+ spin_unlock(&utrace->lock);
+ return -EALREADY;
+ goto unlock;
+ }
+ target->utrace_flags |= events;
+ read_unlock(&tasklist_lock);
@ -4462,7 +4177,7 @@ index 0000000..f5a9e2c
+ if (utrace->reporting == engine)
+ ret = -EINPROGRESS;
+ }
+
+unlock:
+ spin_unlock(&utrace->lock);
+
+ return ret;
@ -6321,6 +6036,3 @@ index 0000000..f5a9e2c
+{
+ seq_printf(m, "Utrace:\t%lx\n", p->utrace_flags);
+}
--
1.7.0.1