[kernel/f16] Update utrace patch
Josh Boyer
jwboyer at fedoraproject.org
Mon Aug 8 18:01:49 UTC 2011
commit c307f0b0e766acd54b7c9e031f9b613d85640371
Author: Josh Boyer <jwboyer at redhat.com>
Date: Mon Aug 8 14:01:20 2011 -0400
Update utrace patch
kernel.spec | 5 +-
utrace.patch | 1169 ++++++++++++++++++++++++++++++++++++---------------------
2 files changed, 742 insertions(+), 432 deletions(-)
---
diff --git a/kernel.spec b/kernel.spec
index 79be57b..843f9f5 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -51,7 +51,7 @@ Summary: The Linux kernel
# For non-released -rc kernels, this will be prepended with "0.", so
# for example a 3 here will become 0.3
#
-%global baserelease 2
+%global baserelease 3
%global fedora_build %{baserelease}
# base_sublevel is the kernel version we're starting with and patching
@@ -1899,6 +1899,9 @@ fi
# and build.
%changelog
+* Mon Aug 08 2011 Josh Boyer <jwboyer at redhat.com>
+- Bring in utrace fixes davej applied to f15. (rhbz 728379)
+
* Fri Aug 05 2011 Josh Boyer <jwboyer at redhat.com>
- Adjust Makefile munging for new 3.x numbering scheme
diff --git a/utrace.patch b/utrace.patch
index 55d0b3c..f5515e3 100644
--- a/utrace.patch
+++ b/utrace.patch
@@ -1,41 +1,42 @@
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From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
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-Subject: [PATCH 01/19] utrace core
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+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 01/22] utrace core
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@@ -4156,8 +4157,7 @@ index 0000000..f332d65
--
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-Subject: [PATCH 02/19] utrace: remove jobctl bits
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- change utrace_get_signal() to check GROUP_STOP_PENDING instead of
signal->group_stop_count. With the recent changes group_stop_count
@@ -4257,8 +4258,7 @@ index f332d65..6e7fafb 100644
--
1.5.5.1
-
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-Subject: [PATCH 03/19] ptrace: take ->siglock around s/TRACED/RUNNING/
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+Subject: [PATCH 03/22] ptrace: take ->siglock around s/TRACED/RUNNING/
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change ptrace_resume() and ptrace_stop() to take ->siglock around changing
task->state from TRACED to RUNNING.
@@ -4358,8 +4359,7 @@ index ff76786..2138cee 100644
--
1.5.5.1
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From: Oleg Nesterov <oleg at redhat.com>
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Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
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-Subject: [PATCH 04/19] introduce wake_up_quiescent()
-Message-ID: <20110701002107.GA25790 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 04/22] introduce wake_up_quiescent()
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No functional changes. Add the new helper, wake_up_quiescent(task, state),
which simply returns wake_up_state(task, state). Change all callers which
@@ -4496,8 +4497,7 @@ index 6e7fafb..d7c547c 100644
--
1.5.5.1
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:31 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:28 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 05/19] introduce ptrace_signal_wake_up()
-Message-ID: <20110701002111.GA25797 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 05/22] introduce ptrace_signal_wake_up()
+Message-ID: <20110807191528.GA14386 at redhat.com>
MIME-Version: 1.0
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+In-Reply-To: <20110807191434.GA13184 at redhat.com>
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+Content-Length: 1974
+Lines: 67
Add the new helper, ptrace_signal_wake_up(), change ptrace.c to use
it instead of signal_wake_up().
@@ -4609,8 +4610,7 @@ index 26ae214..0b2aba5 100644
--
1.5.5.1
-
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:34 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:31 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 06/19] wait_task_inactive: treat task->state and
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 06/22] wait_task_inactive: treat task->state and
match_state as bitmasks
-Message-ID: <20110701002114.GA25804 at redhat.com>
+Message-ID: <20110807191531.GA14393 at redhat.com>
MIME-Version: 1.0
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+In-Reply-To: <20110807191434.GA13184 at redhat.com>
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+Content-Length: 1557
+Lines: 38
Change wait_task_inactive() to check "state & match_state" instead of
"state == match_state". This should not make any difference, but this
@@ -4694,8 +4695,7 @@ index 3f2e502..ade7997 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:15 2011
Return-Path: oleg at redhat.com
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
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@@ -4704,40 +4704,41 @@ X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD,
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:36 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:34 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 07/19] introduce TASK_UTRACED state
-Message-ID: <20110701002117.GA25807 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 07/22] introduce TASK_UTRACED state
+Message-ID: <20110807191534.GA14396 at redhat.com>
MIME-Version: 1.0
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+In-Reply-To: <20110807191434.GA13184 at redhat.com>
User-Agent: Mutt/1.5.18 (2008-05-17)
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+X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23
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+Content-Length: 2912
+Lines: 83
Introduce TASK_UTRACED state, will be used by utrace instead of TASK_TRACED.
@@ -4823,8 +4824,7 @@ index b87de83..7a0008c 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:17 2011
Return-Path: oleg at redhat.com
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:39 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:37 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 08/19] utrace: use TASK_UTRACED instead of TASK_TRACED
-Message-ID: <20110701002120.GA25814 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 08/22] utrace: use TASK_UTRACED instead of TASK_TRACED
+Message-ID: <20110807191537.GA14403 at redhat.com>
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+In-Reply-To: <20110807191434.GA13184 at redhat.com>
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+X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25
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+Content-Length: 4315
+Lines: 129
Change utrace.c to use TASK_UTRACED instead of TASK_TRACED.
@@ -4998,8 +4999,7 @@ index d7c547c..be98607 100644
--
1.5.5.1
-
-From davej Thu Jun 30 20:27:12 2011
+From davej Sun Aug 7 15:19:19 2011
Return-Path: oleg at redhat.com
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@@ -5008,41 +5008,42 @@ X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD,
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:41 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:39 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 09/19] tracehooks: kill tracehook_finish_jctl(), add
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 09/22] tracehooks: kill tracehook_finish_jctl(), add
tracehook_finish_stop()
-Message-ID: <20110701002124.GA25817 at redhat.com>
+Message-ID: <20110807191539.GA14406 at redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
+In-Reply-To: <20110807191434.GA13184 at redhat.com>
User-Agent: Mutt/1.5.18 (2008-05-17)
-X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12
+X-Scanned-By: MIMEDefang 2.68 on 10.5.11.25
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-Content-Length: 2782
-Lines: 86
+Content-Length: 2781
+Lines: 85
tracehook_finish_jctl() is needed to avoid the races with SIGKILL
which wakes up UTRACED task, and thus it should be called every time
@@ -5130,8 +5131,7 @@ index be98607..daa96b9 100644
--
1.5.5.1
-
-From davej Thu Jun 30 20:27:13 2011
+From davej Sun Aug 7 15:19:18 2011
Return-Path: oleg at redhat.com
X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
gelk.kernelslacker.org
@@ -5140,40 +5140,41 @@ X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD,
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+Date: Sun, 7 Aug 2011 21:15:42 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 10/19] teach wake_up_quiescent() to do "selective" wake_up
-Message-ID: <20110701002127.GA25824 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 10/22] teach wake_up_quiescent() to do "selective" wake_up
+Message-ID: <20110807191542.GA14409 at redhat.com>
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+Content-Length: 1334
+Lines: 45
Both utrace and ptrace can want the same thread to be quiescent, in this
case its state is TASK_TRACED | TASK_UTRACED. And this also means that
@@ -5221,8 +5222,7 @@ index a7979ad..57552e6 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:20 2011
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@@ -5231,41 +5231,42 @@ X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD,
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:47 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:45 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 11/19] ptrace_stop: do not assume the task is running after
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 11/22] ptrace_stop: do not assume the task is running after
wake_up_quiescent()
-Message-ID: <20110701002130.GA25827 at redhat.com>
+Message-ID: <20110807191545.GA14416 at redhat.com>
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+Content-Length: 961
+Lines: 30
If ptrace_stop() sets TASK_TRACED and then detects we should not stop,
it can race with utrace_do_stop() which can see TASK_TRACED and add
@@ -5298,8 +5299,7 @@ index 57552e6..89e691d 100644
--
1.5.5.1
-
-From davej Thu Jun 30 20:27:17 2011
+From davej Sun Aug 7 15:19:21 2011
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:49 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:47 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 12/19] get_signal_to_deliver: restructure utrace/ptrace
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 12/22] get_signal_to_deliver: restructure utrace/ptrace
signal reporting
-Message-ID: <20110701002134.GA25834 at redhat.com>
+Message-ID: <20110807191547.GA14419 at redhat.com>
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+In-Reply-To: <20110807191434.GA13184 at redhat.com>
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+Content-Length: 2011
+Lines: 72
get_signal_to_deliver() assumes that either tracehook_get_signal() does
nothing (without CONFIG_UTRACE), or it also reports the signal to ptrace
@@ -5417,8 +5418,7 @@ index 89e691d..d0e0c67 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:22 2011
Return-Path: oleg at redhat.com
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:52 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:50 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 13/19] introduce ptrace_set_syscall_trace()
-Message-ID: <20110701002137.GA25837 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 13/22] introduce ptrace_set_syscall_trace()
+Message-ID: <20110807191550.GA14426 at redhat.com>
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+Content-Length: 1580
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No functional changes. Add the new helper, ptrace_set_syscall_trace(),
which should be used to set/clear TIF_SYSCALL_TRACE in ptrace code.
@@ -5514,8 +5515,7 @@ index 0b2aba5..b6fd922 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:23 2011
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:15:54 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:15:52 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 14/19] introduce PT_SYSCALL_TRACE flag
-Message-ID: <20110701002140.GA25844 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 14/22] introduce PT_SYSCALL_TRACE flag
+Message-ID: <20110807191552.GA14429 at redhat.com>
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Currently tracehooks assume that if the ptraced task has
TIF_SYSCALL_TRACE set, the tracee should report the syscall.
@@ -5632,8 +5633,7 @@ index b6fd922..0825a01 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:24 2011
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+Date: Sun, 7 Aug 2011 21:15:55 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 15/19] utrace: don't clear TIF_SYSCALL_TRACE if it is
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 15/22] utrace: don't clear TIF_SYSCALL_TRACE if it is
needed by ptrace
-Message-ID: <20110701002144.GA25847 at redhat.com>
+Message-ID: <20110807191555.GA14436 at redhat.com>
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TIF_SYSCALL_TRACE should be cleared only if both ptrace and utrace do
not want it, change utrace_reset() to check PT_SYSCALL_TRACE before
@@ -5702,8 +5703,7 @@ index daa96b9..a824ac3 100644
--
1.5.5.1
-
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+From davej Sun Aug 7 15:19:25 2011
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+Date: Sun, 7 Aug 2011 21:15:58 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
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-Subject: [PATCH 16/19] introduce task_utrace_lock/task_utrace_unlock
-Message-ID: <20110701002147.GA25854 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 16/22] introduce task_utrace_lock/task_utrace_unlock
+Message-ID: <20110807191558.GA14440 at redhat.com>
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- Add task_utrace_lock(task). It simply takes task->utrace->lock if
this task was ever utraced. Otherwise it takes task_lock(), this
@@ -5828,8 +5829,7 @@ index a824ac3..508c13c 100644
--
1.5.5.1
-
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+Date: Sun, 7 Aug 2011 21:16:00 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 17/19] teach ptrace_set_syscall_trace() to play well with
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 17/22] teach ptrace_set_syscall_trace() to play well with
utrace
-Message-ID: <20110701002150.GA25861 at redhat.com>
+Message-ID: <20110807191600.GA14443 at redhat.com>
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+Content-Length: 1512
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1. ptrace_set_syscall_trace(true)->set_tsk_thread_flag(TIF_SYSCALL_TRACE)
can race with utrace_control()->utrace_reset() path which can miss
@@ -5923,8 +5924,7 @@ index 0825a01..209ea2d 100644
--
1.5.5.1
-
-From davej Thu Jun 30 20:27:24 2011
+From davej Sun Aug 7 15:19:27 2011
Return-Path: oleg at redhat.com
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@@ -5933,40 +5933,41 @@ X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD,
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:16:05 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:16:03 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 18/19] introduce PT_SINGLE_STEP and PT_SINGLE_BLOCK
-Message-ID: <20110701002154.GA25864 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 18/22] introduce PT_SINGLE_STEP and PT_SINGLE_BLOCK
+Message-ID: <20110807191603.GA14450 at redhat.com>
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+Content-Length: 3724
+Lines: 107
Add the new internal ptrace flags, PT_SINGLE_STEP and PT_SINGLE_BLOCK.
@@ -6076,8 +6077,7 @@ index 209ea2d..44908d0 100644
--
1.5.5.1
-
-From davej Thu Jun 30 20:27:26 2011
+From davej Sun Aug 7 15:19:29 2011
Return-Path: oleg at redhat.com
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@@ -6086,58 +6086,92 @@ X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,T_RP_MATCHES_RCVD,
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- oleg at redhat.com; Fri, 1 Jul 2011 02:21:59 +0200 (CEST)
-Date: Fri, 1 Jul 2011 02:21:57 +0200
+ oleg at redhat.com; Sun, 7 Aug 2011 21:16:08 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:16:06 +0200
From: Oleg Nesterov <oleg at redhat.com>
To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
-Cc: kernel at lists.fedoraproject.org, utrace-devel at redhat.com
-Subject: [PATCH 19/19] utrace: consult PT_SINGLE_STEP/PT_SINGLE_BLOCK
- before user_disable_single_step()
-Message-ID: <20110701002157.GA25871 at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 19/22] utrace: finish_resume_report: don't do
+ user_xxx_step() if ptrace_wants_step()
+Message-ID: <20110807191606.GA14453 at redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
+In-Reply-To: <20110807191434.GA13184 at redhat.com>
User-Agent: Mutt/1.5.18 (2008-05-17)
-X-Scanned-By: MIMEDefang 2.67 on 10.5.11.11
+X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22
Status: RO
-Content-Length: 1150
-Lines: 41
-
-- do not do user_enable_block_step() if PT_SINGLE_STEP is set, in this
- case ptrace has already called user_enable_single_step()
+Content-Length: 2740
+Lines: 83
-- do not do user_disable_single_step() if PT_*_STEP is set, ptrace needs
- the stepping
+finish_resume_report() should not enable/disable the stepping if
+ptrace_wants_step() == T. If ptrace wants block_step while utrace
+wants single_step we could "promote" the stepping, but I do not
+think this really makes sense.
-Unless the tracee is killed this can't race with ptrace, this is called
-by the tracee itself.
+Unless the tracee is killed this can't race with ptrace, this is
+called by the tracee itself. If it is killed we do not care.
Signed-off-by: Oleg Nesterov <oleg at redhat.com>
---
- kernel/utrace.c | 6 ++++--
- 1 files changed, 4 insertions(+), 2 deletions(-)
+ include/linux/tracehook.h | 8 ++++----
+ kernel/utrace.c | 9 ++++++---
+ 2 files changed, 10 insertions(+), 7 deletions(-)
+diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
+index 06edb52..5612d2d 100644
+--- a/include/linux/tracehook.h
++++ b/include/linux/tracehook.h
+@@ -121,8 +121,8 @@ static inline __must_check int tracehook_report_syscall_entry(
+ return 0;
+ }
+
+-#define ptrace_wants_step() \
+- (current->ptrace & (PT_SINGLE_STEP | PT_SINGLE_BLOCK))
++#define ptrace_wants_step(task) \
++ ((task)->ptrace & (PT_SINGLE_STEP | PT_SINGLE_BLOCK))
+
+ /**
+ * tracehook_report_syscall_exit - task has just finished a system call
+@@ -146,7 +146,7 @@ static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step)
+ if (task_utrace_flags(current) & UTRACE_EVENT(SYSCALL_EXIT))
+ utrace_report_syscall_exit(regs);
+
+- if (step && ptrace_wants_step()) {
++ if (step && ptrace_wants_step(current)) {
+ siginfo_t info;
+ user_single_step_siginfo(current, regs, &info);
+ force_sig_info(SIGTRAP, &info, current);
+@@ -439,7 +439,7 @@ static inline void tracehook_signal_handler(int sig, siginfo_t *info,
+ {
+ if (task_utrace_flags(current))
+ utrace_signal_handler(current, stepping);
+- if (stepping && ptrace_wants_step())
++ if (stepping && ptrace_wants_step(current))
+ ptrace_notify(SIGTRAP);
+ }
+
diff --git a/kernel/utrace.c b/kernel/utrace.c
-index 508c13c..d6607cb 100644
+index 508c13c..fbabb81 100644
--- a/kernel/utrace.c
+++ b/kernel/utrace.c
@@ -1828,7 +1828,8 @@ static void finish_resume_report(struct task_struct *task,
@@ -6145,17 +6179,27 @@ index 508c13c..d6607cb 100644
case UTRACE_BLOCKSTEP:
if (likely(arch_has_block_step())) {
- user_enable_block_step(task);
-+ if (!(current->ptrace & PT_SINGLE_STEP))
++ if (!ptrace_wants_step(task))
+ user_enable_block_step(task);
break;
}
-@@ -1856,7 +1857,8 @@ static void finish_resume_report(struct task_struct *task,
+@@ -1841,7 +1842,8 @@ static void finish_resume_report(struct task_struct *task,
+
+ case UTRACE_SINGLESTEP:
+ if (likely(arch_has_single_step())) {
+- user_enable_single_step(task);
++ if (!ptrace_wants_step(task))
++ user_enable_single_step(task);
+ } else {
+ /*
+ * This means some callback is to blame for failing
+@@ -1856,7 +1858,8 @@ static void finish_resume_report(struct task_struct *task,
case UTRACE_REPORT:
case UTRACE_RESUME:
default:
- user_disable_single_step(task);
-+ if (!(current->ptrace & (PT_SINGLE_STEP | PT_SINGLE_BLOCK)))
++ if (!ptrace_wants_step(task))
+ user_disable_single_step(task);
break;
}
@@ -6163,4 +6207,267 @@ index 508c13c..d6607cb 100644
--
1.5.5.1
+From davej Sun Aug 7 15:19:30 2011
+Return-Path: oleg at redhat.com
+X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:16:10 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:16:08 +0200
+From: Oleg Nesterov <oleg at redhat.com>
+To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
+ Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
+ Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 20/22] ptrace: shift user_*_step() from ptrace_resume() to
+ ptrace_stop()
+Message-ID: <20110807191608.GA14460 at redhat.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline
+In-Reply-To: <20110807191434.GA13184 at redhat.com>
+User-Agent: Mutt/1.5.18 (2008-05-17)
+X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12
+Status: RO
+Content-Length: 2384
+Lines: 70
+
+1. ptrace_resume() plays with the stopped task which can be also
+ task_is_utraced(). In this case user_enable_xxx_step() can race
+ with utrace_reset()->user_disable_single_step().
+
+ We could change utrace_reset() to check ptrace_wants_step() and
+ add the task_utrace_lock + unlock barrier after ptrace_resume()
+ sets PT_SINGLE_STEP.
+
+ But it is better to reassign enable/desable from the tracer to
+ the tracee, it can check its PT_SINGLE_ bits after wakeup. This
+ also makes sense because enable_step(task) can be faster if
+ task == current.
+
+2. ptrace can do user_disable_single_step() while utrace needs the
+ stepping.
+
+ Set TIF_NOTIFY_RESUME after user_disable_single_step() to ensure
+ the tracee can't return to the user-space without utrace_resume().
+ Any correct engine which wants the stepping should reassert it.
+
+Signed-off-by: Oleg Nesterov <oleg at redhat.com>
+---
+ kernel/ptrace.c | 4 ----
+ kernel/signal.c | 12 ++++++++++++
+ 2 files changed, 12 insertions(+), 4 deletions(-)
+
+diff --git a/kernel/ptrace.c b/kernel/ptrace.c
+index 44908d0..d37b30d 100644
+--- a/kernel/ptrace.c
++++ b/kernel/ptrace.c
+@@ -580,14 +580,10 @@ static int ptrace_resume(struct task_struct *child, long request,
+ if (unlikely(!arch_has_block_step()))
+ return -EIO;
+ child->ptrace |= PT_SINGLE_BLOCK;
+- user_enable_block_step(child);
+ } else if (is_singlestep(request) || is_sysemu_singlestep(request)) {
+ if (unlikely(!arch_has_single_step()))
+ return -EIO;
+ child->ptrace |= PT_SINGLE_STEP;
+- user_enable_single_step(child);
+- } else {
+- user_disable_single_step(child);
+ }
+
+ child->exit_code = data;
+diff --git a/kernel/signal.c b/kernel/signal.c
+index d0e0c67..bc40bd7 100644
+--- a/kernel/signal.c
++++ b/kernel/signal.c
+@@ -1840,6 +1840,18 @@ static void ptrace_stop(int exit_code, int why, int clear_code, siginfo_t *info)
+ }
+
+ tracehook_finish_stop();
++
++ if (current->ptrace & PT_SINGLE_BLOCK)
++ user_enable_block_step(current);
++ else if (current->ptrace & PT_SINGLE_STEP)
++ user_enable_single_step(current);
++ else {
++ user_disable_single_step(current);
++ /* if utrace needs the stepping it should reassert */
++ if (task_utrace_flags(current))
++ set_thread_flag(TIF_NOTIFY_RESUME);
++ }
++
+ /*
+ * While in TASK_TRACED, we were considered "frozen enough".
+ * Now that we woke up, it's crucial if we're supposed to be
+--
+1.5.5.1
+
+From davej Sun Aug 7 15:19:31 2011
+Return-Path: oleg at redhat.com
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+Received: from zmta03.collab.prod.int.phx2.redhat.com (LHLO
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:16:13 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:16:11 +0200
+From: Oleg Nesterov <oleg at redhat.com>
+To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
+ Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
+ Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 21/22] ptrace_disable: no need to disable stepping
+Message-ID: <20110807191611.GA14463 at redhat.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline
+In-Reply-To: <20110807191434.GA13184 at redhat.com>
+User-Agent: Mutt/1.5.18 (2008-05-17)
+X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12
+Status: RO
+Content-Length: 944
+Lines: 28
+
+ptrace_disable() is called when the tracee is quiescent and we
+are going to untrace. This means we are going to clear ->ptrace
+and wake up the tracee. Now that ptrace_stop() checks PT_ bits
+and does user_disable_single_step() we can remove this code from
+ptrace_disable(), it is unneeded and not utrace-friendly.
+
+TODO: change !x86 code.
+
+Signed-off-by: Oleg Nesterov <oleg at redhat.com>
+---
+ arch/x86/kernel/ptrace.c | 2 --
+ 1 files changed, 0 insertions(+), 2 deletions(-)
+
+diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
+index 7ab475f..f1cdc7d 100644
+--- a/arch/x86/kernel/ptrace.c
++++ b/arch/x86/kernel/ptrace.c
+@@ -807,8 +807,6 @@ static int ioperm_get(struct task_struct *target,
+ */
+ void ptrace_disable(struct task_struct *child)
+ {
+- child->ptrace &= ~(PT_SINGLE_STEP | PT_SINGLE_BLOCK);
+- user_disable_single_step(child);
+ #ifdef TIF_SYSCALL_EMU
+ clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
+ #endif
+--
+1.5.5.1
+
+From davej Sun Aug 7 15:19:32 2011
+Return-Path: oleg at redhat.com
+X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on
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+ oleg at redhat.com; Sun, 7 Aug 2011 21:16:15 +0200 (CEST)
+Date: Sun, 7 Aug 2011 21:16:13 +0200
+From: Oleg Nesterov <oleg at redhat.com>
+To: "Frank Ch. Eigler" <fche at redhat.com>, Kyle McMartin <kmcmartin at redhat.com>,
+ Dave Jones <davej at redhat.com>, Josh Stone <jistone at redhat.com>,
+ Matthew Garrett <mjg at redhat.com>, David Smith <dsmith at redhat.com>
+Cc: kernel at lists.fedoraproject.org
+Subject: [PATCH 22/22] ptrace_report_syscall: check TIF_SYSCALL_EMU
+Message-ID: <20110807191613.GA14470 at redhat.com>
+MIME-Version: 1.0
+Content-Type: text/plain; charset=us-ascii
+Content-Disposition: inline
+In-Reply-To: <20110807191434.GA13184 at redhat.com>
+User-Agent: Mutt/1.5.18 (2008-05-17)
+X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23
+Status: RO
+Content-Length: 862
+Lines: 27
+
+4d16a64 "introduce PT_SYSCALL_TRACE flag" breaks PTRACE_SYSEMU
+which doesn't set PT_SYSCALL_TRACE.
+
+Change ptrace_report_syscall() to check TIF_SYSCALL_EMU as well.
+This can't conflict with utrace, this flag can only be set by
+ptrace.
+
+Signed-off-by: Oleg Nesterov <oleg at redhat.com>
+---
+ include/linux/tracehook.h | 2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/include/linux/tracehook.h b/include/linux/tracehook.h
+index 5612d2d..ac833de 100644
+--- a/include/linux/tracehook.h
++++ b/include/linux/tracehook.h
+@@ -76,7 +76,7 @@ static inline void ptrace_report_syscall(struct pt_regs *regs)
+ {
+ int ptrace = task_ptrace(current);
+
+- if (!(ptrace & PT_SYSCALL_TRACE))
++ if (!(ptrace & PT_SYSCALL_TRACE) && !test_thread_flag(TIF_SYSCALL_EMU))
+ return;
+
+ ptrace_notify(SIGTRAP | ((ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
+--
+1.5.5.1
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