tequilaOS/platform_system_core
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
platform_system_core/include/log/logger.h
Mark Salyzyn 305374cf0f logger: validate hdr_size field in logger entry 
- check hdr_size to make sure it is in the expected range
  from sizeof entry_v1 to entry (entry_v4).
- alter msg() method to report NULL on invalid hdr_size
- alter all users of msg() method.

Bug: 30947841
Change-Id: I9bc1740d7aa9f37df5be966c18de1fb9de63d5dd
2016-08-23 14:51:50 -07:00

226 lines
7.5 KiB
C
Raw Blame History

/*
**
** Copyright 2007-2014, The Android Open Source Project
**
** This file is dual licensed. It may be redistributed and/or modified
** under the terms of the Apache 2.0 License OR version 2 of the GNU
** General Public License.
*/
#ifndef _LIBS_LOG_LOGGER_H
#define _LIBS_LOG_LOGGER_H
#include <stdint.h>
#ifdef __linux__
#include <time.h> /* clockid_t definition */
#endif
#include <log/log.h>
#include <log/log_read.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* The userspace structure for version 1 of the logger_entry ABI.
* This structure is returned to userspace by the kernel logger
* driver unless an upgrade to a newer ABI version is requested.
*/
struct logger_entry {
uint16_t len; /* length of the payload */
uint16_t __pad; /* no matter what, we get 2 bytes of padding */
int32_t pid; /* generating process's pid */
int32_t tid; /* generating process's tid */
int32_t sec; /* seconds since Epoch */
int32_t nsec; /* nanoseconds */
char msg[0]; /* the entry's payload */
} __attribute__((__packed__));
/*
* The userspace structure for version 2 of the logger_entry ABI.
* This structure is returned to userspace if ioctl(LOGGER_SET_VERSION)
* is called with version==2; or used with the user space log daemon.
*/
struct logger_entry_v2 {
uint16_t len; /* length of the payload */
uint16_t hdr_size; /* sizeof(struct logger_entry_v2) */
int32_t pid; /* generating process's pid */
int32_t tid; /* generating process's tid */
int32_t sec; /* seconds since Epoch */
int32_t nsec; /* nanoseconds */
uint32_t euid; /* effective UID of logger */
char msg[0]; /* the entry's payload */
} __attribute__((__packed__));
struct logger_entry_v3 {
uint16_t len; /* length of the payload */
uint16_t hdr_size; /* sizeof(struct logger_entry_v3) */
int32_t pid; /* generating process's pid */
int32_t tid; /* generating process's tid */
int32_t sec; /* seconds since Epoch */
int32_t nsec; /* nanoseconds */
uint32_t lid; /* log id of the payload */
char msg[0]; /* the entry's payload */
} __attribute__((__packed__));
struct logger_entry_v4 {
uint16_t len; /* length of the payload */
uint16_t hdr_size; /* sizeof(struct logger_entry_v4) */
int32_t pid; /* generating process's pid */
uint32_t tid; /* generating process's tid */
uint32_t sec; /* seconds since Epoch */
uint32_t nsec; /* nanoseconds */
uint32_t lid; /* log id of the payload, bottom 4 bits currently */
uint32_t uid; /* generating process's uid */
char msg[0]; /* the entry's payload */
} __attribute__((__packed__));
/*
* The maximum size of the log entry payload that can be
* written to the logger. An attempt to write more than
* this amount will result in a truncated log entry.
*/
#define LOGGER_ENTRY_MAX_PAYLOAD 4068
/*
* The maximum size of a log entry which can be read from the
* kernel logger driver. An attempt to read less than this amount
* may result in read() returning EINVAL.
*/
#define LOGGER_ENTRY_MAX_LEN (5*1024)
#define NS_PER_SEC 1000000000ULL
struct log_msg {
union {
unsigned char buf[LOGGER_ENTRY_MAX_LEN + 1];
struct logger_entry_v4 entry;
struct logger_entry_v4 entry_v4;
struct logger_entry_v3 entry_v3;
struct logger_entry_v2 entry_v2;
struct logger_entry entry_v1;
} __attribute__((aligned(4)));
#ifdef __cplusplus
/* Matching log_time operators */
bool operator== (const log_msg &T) const
{
return (entry.sec == T.entry.sec) && (entry.nsec == T.entry.nsec);
}
bool operator!= (const log_msg &T) const
{
return !(*this == T);
}
bool operator< (const log_msg &T) const
{
return (entry.sec < T.entry.sec)
|| ((entry.sec == T.entry.sec)
&& (entry.nsec < T.entry.nsec));
}
bool operator>= (const log_msg &T) const
{
return !(*this < T);
}
bool operator> (const log_msg &T) const
{
return (entry.sec > T.entry.sec)
|| ((entry.sec == T.entry.sec)
&& (entry.nsec > T.entry.nsec));
}
bool operator<= (const log_msg &T) const
{
return !(*this > T);
}
uint64_t nsec() const
{
return static_cast<uint64_t>(entry.sec) * NS_PER_SEC + entry.nsec;
}
/* packet methods */
log_id_t id()
{
return (log_id_t) entry.lid;
}
char *msg()
{
unsigned short hdr_size = entry.hdr_size;
if (!hdr_size) {
hdr_size = sizeof(entry_v1);
}
if ((hdr_size < sizeof(entry_v1)) || (hdr_size > sizeof(entry))) {
return NULL;
}
return (char *) buf + hdr_size;
}
unsigned int len()
{
return (entry.hdr_size ? entry.hdr_size : sizeof(entry_v1)) + entry.len;
}
#endif
};
struct logger;
log_id_t android_logger_get_id(struct logger *logger);
int android_logger_clear(struct logger *logger);
long android_logger_get_log_size(struct logger *logger);
int android_logger_set_log_size(struct logger *logger, unsigned long size);
long android_logger_get_log_readable_size(struct logger *logger);
int android_logger_get_log_version(struct logger *logger);
struct logger_list;
ssize_t android_logger_get_statistics(struct logger_list *logger_list,
char *buf, size_t len);
ssize_t android_logger_get_prune_list(struct logger_list *logger_list,
char *buf, size_t len);
int android_logger_set_prune_list(struct logger_list *logger_list,
char *buf, size_t len);
#define ANDROID_LOG_RDONLY O_RDONLY
#define ANDROID_LOG_WRONLY O_WRONLY
#define ANDROID_LOG_RDWR O_RDWR
#define ANDROID_LOG_ACCMODE O_ACCMODE
#define ANDROID_LOG_NONBLOCK O_NONBLOCK
#define ANDROID_LOG_WRAP 0x40000000 /* Block until buffer about to wrap */
#define ANDROID_LOG_WRAP_DEFAULT_TIMEOUT 7200 /* 2 hour default */
#define ANDROID_LOG_PSTORE 0x80000000
struct logger_list *android_logger_list_alloc(int mode,
unsigned int tail,
pid_t pid);
struct logger_list *android_logger_list_alloc_time(int mode,
log_time start,
pid_t pid);
void android_logger_list_free(struct logger_list *logger_list);
/* In the purest sense, the following two are orthogonal interfaces */
int android_logger_list_read(struct logger_list *logger_list,
struct log_msg *log_msg);
/* Multiple log_id_t opens */
struct logger *android_logger_open(struct logger_list *logger_list,
log_id_t id);
#define android_logger_close android_logger_free
/* Single log_id_t open */
struct logger_list *android_logger_list_open(log_id_t id,
int mode,
unsigned int tail,
pid_t pid);
#define android_logger_list_close android_logger_list_free
#ifdef __linux__
clockid_t android_log_clockid();
#endif
/*
* log_id_t helpers
*/
log_id_t android_name_to_log_id(const char *logName);
const char *android_log_id_to_name(log_id_t log_id);
#ifdef __cplusplus
}
#endif
#endif /* _LIBS_LOG_LOGGER_H */
Reference in a new issue View git blame Copy permalink