8d6ca194ee
Fix two races in debuggerd's PTRACE_ATTACH logic:
1. The target thread in a crash dump request could exit between the
/proc/<pid>/task/<tid> check and the PTRACE_ATTACH.
2. Sibling threads could exit between listing /proc/<pid>/task and the
PTRACE_ATTACH.
Backport of NYC change I4dfe1ea30e2c211d2389321bd66e3684dd757591
Bug: http://b/29555636
Change-Id: I93f6423e6de38e2bc6c75d8d33052da4cd2daa8a
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* system/debuggerd/utility.h
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**
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** Copyright 2008, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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#ifndef _DEBUGGERD_UTILITY_H
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#define _DEBUGGERD_UTILITY_H
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#include <stddef.h>
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#include <stdbool.h>
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typedef struct {
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/* tombstone file descriptor */
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int tfd;
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/* Activity Manager socket file descriptor */
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int amfd;
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/* if true, does not log anything to the Android logcat or Activity Manager */
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bool quiet;
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} log_t;
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/* Log information onto the tombstone. scopeFlags is a bitmask of the flags defined
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* here. */
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void _LOG(log_t* log, int scopeFlags, const char *fmt, ...)
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__attribute__ ((format(printf, 3, 4)));
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/* The message pertains specifically to the faulting thread / process */
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#define SCOPE_AT_FAULT (1 << 0)
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/* The message contains sensitive information such as RAM contents */
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#define SCOPE_SENSITIVE (1 << 1)
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#define IS_AT_FAULT(x) (((x) & SCOPE_AT_FAULT) != 0)
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#define IS_SENSITIVE(x) (((x) & SCOPE_SENSITIVE) != 0)
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/* Further helpful macros */
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#define LOG(fmt...) _LOG(NULL, SCOPE_AT_FAULT, fmt)
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/* Set to 1 for normal debug traces */
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#if 0
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#define XLOG(fmt...) _LOG(NULL, SCOPE_AT_FAULT, fmt)
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#else
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#define XLOG(fmt...) do {} while(0)
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#endif
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/* Set to 1 for chatty debug traces. Includes all resolved dynamic symbols */
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#if 0
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#define XLOG2(fmt...) _LOG(NULL, SCOPE_AT_FAULT, fmt)
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#else
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#define XLOG2(fmt...) do {} while(0)
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#endif
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int wait_for_signal(pid_t tid, int* total_sleep_time_usec);
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void wait_for_stop(pid_t tid, int* total_sleep_time_usec);
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bool pid_contains_tid(pid_t pid, pid_t tid);
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// Attach to a thread, and verify that it's still a member of the given process
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bool ptrace_attach_thread(pid_t pid, pid_t tid);
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#endif // _DEBUGGERD_UTILITY_H
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