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-rw-r--r--roots.cpp39
1 files changed, 28 insertions, 11 deletions
diff --git a/roots.cpp b/roots.cpp
index 0360bde16..46e5c1bc3 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -28,6 +28,7 @@
#include <android-base/logging.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
+#include <android-base/unique_fd.h>
#include <cryptfs.h>
#include <ext4_utils/wipe.h>
#include <fs_mgr.h>
@@ -165,6 +166,23 @@ static int exec_cmd(const char* path, char* const argv[]) {
return WEXITSTATUS(status);
}
+static ssize_t get_file_size(int fd, uint64_t reserve_len) {
+ struct stat buf;
+ int ret = fstat(fd, &buf);
+ if (ret) return 0;
+
+ ssize_t computed_size;
+ if (S_ISREG(buf.st_mode)) {
+ computed_size = buf.st_size - reserve_len;
+ } else if (S_ISBLK(buf.st_mode)) {
+ computed_size = get_block_device_size(fd) - reserve_len;
+ } else {
+ computed_size = 0;
+ }
+
+ return computed_size;
+}
+
int format_volume(const char* volume, const char* directory) {
Volume* v = volume_for_path(volume);
if (v == NULL) {
@@ -204,7 +222,16 @@ int format_volume(const char* volume, const char* directory) {
if (v->length != 0) {
length = v->length;
} else if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0) {
- length = -CRYPT_FOOTER_OFFSET;
+ android::base::unique_fd fd(open(v->blk_device, O_RDONLY));
+ if (fd < 0) {
+ PLOG(ERROR) << "get_file_size: failed to open " << v->blk_device;
+ return -1;
+ }
+ length = get_file_size(fd.get(), CRYPT_FOOTER_OFFSET);
+ if (length <= 0) {
+ LOG(ERROR) << "get_file_size: invalid size " << length << " for " << v->blk_device;
+ return -1;
+ }
}
int result;
if (strcmp(v->fs_type, "ext4") == 0) {
@@ -262,16 +289,6 @@ int format_volume(const char* volume, const char* directory) {
result = exec_cmd(e2fsdroid_argv[0], const_cast<char**>(e2fsdroid_argv));
}
} else { /* Has to be f2fs because we checked earlier. */
- if (v->key_loc != NULL && strcmp(v->key_loc, "footer") == 0 && length < 0) {
- LOG(ERROR) << "format_volume: crypt footer + negative length (" << length
- << ") not supported on " << v->fs_type;
- return -1;
- }
- if (length < 0) {
- LOG(ERROR) << "format_volume: negative length (" << length
- << ") not supported on " << v->fs_type;
- return -1;
- }
char *num_sectors = nullptr;
if (length >= 512 && asprintf(&num_sectors, "%zd", length / 512) <= 0) {
LOG(ERROR) << "format_volume: failed to create " << v->fs_type