am 17077a28: Merge "Use the correct debuggerd given the tid." (f253fd07) · Commits · e / os / android_system_core

include/cutils/debugger.h

+16 −3

Original line number	Diff line number	Diff line
		@@ -23,10 +23,13 @@
		extern "C" {
		#endif

		#if __LP64__
		#define DEBUGGER_SOCKET_NAME "android:debuggerd64"
		#define DEBUGGER32_SOCKET_NAME "android:debuggerd"
		#define DEBUGGER64_SOCKET_NAME "android:debuggerd64"

		#if defined(__LP64__)
		#define DEBUGGER_SOCKET_NAME DEBUGGER64_SOCKET_NAME
		#else
		#define DEBUGGER_SOCKET_NAME "android:debuggerd"
		#define DEBUGGER_SOCKET_NAME DEBUGGER32_SOCKET_NAME
		#endif

		typedef enum {
		@@ -45,6 +48,16 @@ typedef struct {
		int32_t original_si_code;
		} debugger_msg_t;

		#if defined(__LP64__)
		// For a 64 bit process to contact the 32 bit debuggerd.
		typedef struct {
		debugger_action_t action;
		pid_t tid;
		uint32_t abort_msg_address;
		int32_t original_si_code;
		} debugger32_msg_t;
		#endif

		/* Dumps a process backtrace, registers, and stack to a tombstone file (requires root).
		* Stores the tombstone path in the provided buffer.
		* Returns 0 on success, -1 on error.

libcutils/debugger.c

+119 −57

Original line number	Diff line number	Diff line
		@@ -14,6 +14,9 @@
		* limitations under the License.
		*/

		#include <stdbool.h>
		#include <fcntl.h>
		#include <stdio.h>
		#include <stdlib.h>
		#include <string.h>
		#include <unistd.h>
		@@ -21,70 +24,129 @@
		#include <cutils/debugger.h>
		#include <cutils/sockets.h>

		int dump_tombstone(pid_t tid, char* pathbuf, size_t pathlen) {
		int s = socket_local_client(DEBUGGER_SOCKET_NAME,
		ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
		if (s < 0) {
		return -1;
		#if defined(__LP64__)
		#include <elf.h>

		static bool is32bit(pid_t tid) {
		char* exeline;
		if (asprintf(&exeline, "/proc/%d/exe", tid) == -1) {
		return false;
		}
		int fd = open(exeline, O_RDONLY \| O_CLOEXEC);
		free(exeline);
		if (fd == -1) {
		return false;
		}

		debugger_msg_t msg;
		memset(&msg, 0, sizeof(msg));
		msg.tid = tid;
		msg.action = DEBUGGER_ACTION_DUMP_TOMBSTONE;
		char ehdr[EI_NIDENT];
		ssize_t bytes = read(fd, &ehdr, sizeof(ehdr));
		close(fd);
		if (bytes != (ssize_t) sizeof(ehdr) \|\| memcmp(ELFMAG, ehdr, SELFMAG) != 0) {
		return false;
		}
		if (ehdr[EI_CLASS] == ELFCLASS32) {
		return true;
		}
		return false;
		}
		#endif

		static int send_request(int sock_fd, void* msg_ptr, size_t msg_len) {
		int result = 0;
		if (TEMP_FAILURE_RETRY(write(s, &msg, sizeof(msg))) != sizeof(msg)) {
		if (TEMP_FAILURE_RETRY(write(sock_fd, msg_ptr, msg_len)) != (ssize_t) msg_len) {
		result = -1;
		} else {
		char ack;
		if (TEMP_FAILURE_RETRY(read(s, &ack, 1)) != 1) {
		result = -1;
		} else {
		if (pathbuf && pathlen) {
		ssize_t n = TEMP_FAILURE_RETRY(read(s, pathbuf, pathlen - 1));
		if (n <= 0) {
		if (TEMP_FAILURE_RETRY(read(sock_fd, &ack, 1)) != 1) {
		result = -1;
		} else {
		pathbuf[n] = '\0';
		}
		}
		return result;
		}

		static int make_dump_request(debugger_action_t action, pid_t tid) {
		const char* socket_name;
		debugger_msg_t msg;
		size_t msg_len;
		void* msg_ptr;

		#if defined(__LP64__)
		debugger32_msg_t msg32;
		if (is32bit(tid)) {
		msg_len = sizeof(debugger32_msg_t);
		memset(&msg32, 0, msg_len);
		msg32.tid = tid;
		msg32.action = action;
		msg_ptr = &msg32;

		socket_name = DEBUGGER32_SOCKET_NAME;
		} else
		#endif
		{
		msg_len = sizeof(debugger_msg_t);
		memset(&msg, 0, msg_len);
		msg.tid = tid;
		msg.action = action;
		msg_ptr = &msg;

		socket_name = DEBUGGER_SOCKET_NAME;
		}
		TEMP_FAILURE_RETRY(close(s));
		return result;

		int sock_fd = socket_local_client(socket_name, ANDROID_SOCKET_NAMESPACE_ABSTRACT,
		SOCK_STREAM \| SOCK_CLOEXEC);
		if (sock_fd < 0) {
		return -1;
		}

		int dump_backtrace_to_file(pid_t tid, int fd) {
		int s = socket_local_client(DEBUGGER_SOCKET_NAME,
		ANDROID_SOCKET_NAMESPACE_ABSTRACT, SOCK_STREAM);
		if (s < 0) {
		if (send_request(sock_fd, msg_ptr, msg_len) < 0) {
		TEMP_FAILURE_RETRY(close(sock_fd));
		return -1;
		}

		debugger_msg_t msg;
		memset(&msg, 0, sizeof(msg));
		msg.tid = tid;
		msg.action = DEBUGGER_ACTION_DUMP_BACKTRACE;
		return sock_fd;
		}

		int dump_backtrace_to_file(pid_t tid, int fd) {
		int sock_fd = make_dump_request(DEBUGGER_ACTION_DUMP_BACKTRACE, tid);
		if (sock_fd < 0) {
		return -1;
		}

		/* Write the data read from the socket to the fd. */
		int result = 0;
		if (TEMP_FAILURE_RETRY(write(s, &msg, sizeof(msg))) != sizeof(msg)) {
		result = -1;
		} else {
		char ack;
		if (TEMP_FAILURE_RETRY(read(s, &ack, 1)) != 1) {
		result = -1;
		} else {
		char buffer[4096];
		char buffer[1024];
		ssize_t n;
		while ((n = TEMP_FAILURE_RETRY(read(s, buffer, sizeof(buffer)))) > 0) {
		while ((n = TEMP_FAILURE_RETRY(read(sock_fd, buffer, sizeof(buffer)))) > 0) {
		if (TEMP_FAILURE_RETRY(write(fd, buffer, n)) != n) {
		result = -1;
		break;
		}
		}
		TEMP_FAILURE_RETRY(close(sock_fd));
		return result;
		}

		int dump_tombstone(pid_t tid, char* pathbuf, size_t pathlen) {
		int sock_fd = make_dump_request(DEBUGGER_ACTION_DUMP_TOMBSTONE, tid);
		if (sock_fd < 0) {
		return -1;
		}

		/* Read the tombstone file name. */
		char buffer[100]; /* This is larger than the largest tombstone path. */
		int result = 0;
		ssize_t n = TEMP_FAILURE_RETRY(read(sock_fd, buffer, sizeof(buffer) - 1));
		if (n <= 0) {
		result = -1;
		} else {
		if (pathbuf && pathlen) {
		if (n >= (ssize_t) pathlen) {
		n = pathlen - 1;
		}
		buffer[n] = '\0';
		memcpy(pathbuf, buffer, n + 1);
		}
		}
		TEMP_FAILURE_RETRY(close(s));
		TEMP_FAILURE_RETRY(close(sock_fd));
		return result;
		}