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Merge "Reland "fdsan: make fatal by default.""

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Treehugger Robot 2019-08-21 07:57:28 +00:00 committed by Gerrit Code Review
commit 28cf07f93d
3 changed files with 54 additions and 26 deletions
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65
libc/bionic/fdsan.cpp
View file

@ -106,30 +106,8 @@ FdEntry* FdTableImpl<inline_fds>::at(size_t idx) {
}
void __libc_init_fdsan() {
constexpr auto default_level = ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE;
const prop_info* pi = __system_property_find(kFdsanPropertyName);
if (!pi) {
android_fdsan_set_error_level(default_level);
return;
}
__system_property_read_callback(
pi,
[](void*, const char*, const char* value, uint32_t) {
if (strcasecmp(value, "1") == 0 || strcasecmp(value, "fatal") == 0) {
android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_FATAL);
} else if (strcasecmp(value, "warn") == 0) {
android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ALWAYS);
} else if (strcasecmp(value, "warn_once") == 0) {
android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE);
} else {
if (strlen(value) != 0 && strcasecmp(value, "0") != 0) {
async_safe_format_log(ANDROID_LOG_ERROR, "libc",
"debug.fdsan set to unknown value '%s', disabling", value);
}
android_fdsan_set_error_level(default_level);
}
},
nullptr);
constexpr auto default_level = ANDROID_FDSAN_ERROR_LEVEL_FATAL;
android_fdsan_set_error_level_from_property(default_level);
}
static FdTable& GetFdTable() {
@ -355,6 +333,45 @@ android_fdsan_error_level android_fdsan_set_error_level(android_fdsan_error_leve
return atomic_exchange(&GetFdTable().error_level, new_level);
}
android_fdsan_error_level android_fdsan_set_error_level_from_property(
android_fdsan_error_level default_level) {
const prop_info* pi = __system_property_find(kFdsanPropertyName);
if (!pi) {
return android_fdsan_set_error_level(default_level);
}
struct callback_data {
android_fdsan_error_level default_value;
android_fdsan_error_level result;
};
callback_data data;
data.default_value = default_level;
__system_property_read_callback(
pi,
[](void* arg, const char*, const char* value, uint32_t) {
callback_data* data = static_cast<callback_data*>(arg);
if (strcasecmp(value, "1") == 0 || strcasecmp(value, "fatal") == 0) {
data->result = android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_FATAL);
} else if (strcasecmp(value, "warn") == 0) {
data->result = android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ALWAYS);
} else if (strcasecmp(value, "warn_once") == 0) {
data->result = android_fdsan_set_error_level(ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE);
} else {
if (strlen(value) != 0 && strcasecmp(value, "0") != 0) {
async_safe_format_log(ANDROID_LOG_ERROR, "libc",
"debug.fdsan set to unknown value '%s', disabling", value);
}
data->result = android_fdsan_set_error_level(data->default_value);
}
},
&data);
return data.result;
}
int close(int fd) {
int rc = android_fdsan_close_with_tag(fd, 0);
if (rc == -1 && errno == EINTR) {

4
libc/include/android/fdsan.h
View file

@ -197,4 +197,8 @@ enum android_fdsan_error_level android_fdsan_get_error_level() __INTRODUCED_IN(2
*/
enum android_fdsan_error_level android_fdsan_set_error_level(enum android_fdsan_error_level new_level) __INTRODUCED_IN(29) __attribute__((__weak__));
/*
* Set the error level to the global setting if available, or a default value.
*/
enum android_fdsan_error_level android_fdsan_set_error_level_from_property(enum android_fdsan_error_level default_level) __INTRODUCED_IN(30) __attribute__((__weak__));
__END_DECLS

11
linker/linker_sdk_versions.cpp
View file

@ -26,10 +26,13 @@
* SUCH DAMAGE.
*/
#include "linker.h"
#include <android/api-level.h>
#include <atomic>
#include <android/api-level.h>
#include <android/fdsan.h>
#include "linker.h"
static std::atomic<int> g_target_sdk_version(__ANDROID_API__);
void set_application_target_sdk_version(int target) {
@ -38,6 +41,10 @@ void set_application_target_sdk_version(int target) {
target = __ANDROID_API__;
}
g_target_sdk_version = target;
if (target < 30) {
android_fdsan_set_error_level_from_property(ANDROID_FDSAN_ERROR_LEVEL_WARN_ONCE);
}
}
int get_application_target_sdk_version() {