diff options
Diffstat (limited to 'applypatch')
| -rw-r--r-- | applypatch/Android.mk | 4 | ||||
| -rw-r--r-- | applypatch/applypatch.c | 311 | ||||
| -rw-r--r-- | applypatch/applypatch.h | 9 | ||||
| -rw-r--r-- | applypatch/main.c | 2 |
4 files changed, 212 insertions, 114 deletions
diff --git a/applypatch/Android.mk b/applypatch/Android.mk index e91e4bf88..eff1d77b3 100644 --- a/applypatch/Android.mk +++ b/applypatch/Android.mk @@ -31,7 +31,7 @@ include $(CLEAR_VARS) LOCAL_SRC_FILES := main.c LOCAL_MODULE := applypatch LOCAL_C_INCLUDES += bootable/recovery -LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz +LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz libminelf LOCAL_SHARED_LIBRARIES += libz libcutils libstdc++ libc include $(BUILD_EXECUTABLE) @@ -43,7 +43,7 @@ LOCAL_MODULE := applypatch_static LOCAL_FORCE_STATIC_EXECUTABLE := true LOCAL_MODULE_TAGS := eng LOCAL_C_INCLUDES += bootable/recovery -LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz +LOCAL_STATIC_LIBRARIES += libapplypatch libmtdutils libmincrypt libbz libminelf LOCAL_STATIC_LIBRARIES += libz libcutils libstdc++ libc include $(BUILD_EXECUTABLE) diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c index b85b91592..106091386 100644 --- a/applypatch/applypatch.c +++ b/applypatch/applypatch.c @@ -31,21 +31,27 @@ #include "edify/expr.h" int SaveFileContents(const char* filename, FileContents file); -int LoadMTDContents(const char* filename, FileContents* file); +static int LoadPartitionContents(const char* filename, FileContents* file); int ParseSha1(const char* str, uint8_t* digest); -ssize_t FileSink(unsigned char* data, ssize_t len, void* token); +static ssize_t FileSink(unsigned char* data, ssize_t len, void* token); static int mtd_partitions_scanned = 0; -// Read a file into memory; store it and its associated metadata in -// *file. Return 0 on success. -int LoadFileContents(const char* filename, FileContents* file) { +// Read a file into memory; optionally (retouch_flag == RETOUCH_DO_MASK) mask +// the retouched entries back to their original value (such that SHA-1 checks +// don't fail due to randomization); store the file contents and associated +// metadata in *file. +// +// Return 0 on success. +int LoadFileContents(const char* filename, FileContents* file, + int retouch_flag) { file->data = NULL; - // A special 'filename' beginning with "MTD:" means to load the - // contents of an MTD partition. - if (strncmp(filename, "MTD:", 4) == 0) { - return LoadMTDContents(filename, file); + // A special 'filename' beginning with "MTD:" or "EMMC:" means to + // load the contents of a partition. + if (strncmp(filename, "MTD:", 4) == 0 || + strncmp(filename, "EMMC:", 5) == 0) { + return LoadPartitionContents(filename, file); } if (stat(filename, &file->st) != 0) { @@ -74,6 +80,20 @@ int LoadFileContents(const char* filename, FileContents* file) { } fclose(f); + // apply_patch[_check] functions are blind to randomization. Randomization + // is taken care of in [Undo]RetouchBinariesFn. If there is a mismatch + // within a file, this means the file is assumed "corrupt" for simplicity. + if (retouch_flag) { + int32_t desired_offset = 0; + if (retouch_mask_data(file->data, file->size, + &desired_offset, NULL) != RETOUCH_DATA_MATCHED) { + printf("error trying to mask retouch entries\n"); + free(file->data); + file->data = NULL; + return -1; + } + } + SHA(file->data, file->size, file->sha1); return 0; } @@ -98,26 +118,35 @@ void FreeFileContents(FileContents* file) { free(file); } -// Load the contents of an MTD partition into the provided +// Load the contents of an MTD or EMMC partition into the provided // FileContents. filename should be a string of the form -// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:...". -// The smallest size_n bytes for which that prefix of the mtd contents -// has the corresponding sha1 hash will be loaded. It is acceptable -// for a size value to be repeated with different sha1s. Will return -// 0 on success. +// "MTD:<partition_name>:<size_1>:<sha1_1>:<size_2>:<sha1_2>:..." (or +// "EMMC:<partition_device>:..."). The smallest size_n bytes for +// which that prefix of the partition contents has the corresponding +// sha1 hash will be loaded. It is acceptable for a size value to be +// repeated with different sha1s. Will return 0 on success. // // This complexity is needed because if an OTA installation is // interrupted, the partition might contain either the source or the // target data, which might be of different lengths. We need to know -// the length in order to read from MTD (there is no "end-of-file" -// marker), so the caller must specify the possible lengths and the -// hash of the data, and we'll do the load expecting to find one of -// those hashes. -int LoadMTDContents(const char* filename, FileContents* file) { +// the length in order to read from a partition (there is no +// "end-of-file" marker), so the caller must specify the possible +// lengths and the hash of the data, and we'll do the load expecting +// to find one of those hashes. +enum PartitionType { MTD, EMMC }; + +static int LoadPartitionContents(const char* filename, FileContents* file) { char* copy = strdup(filename); const char* magic = strtok(copy, ":"); - if (strcmp(magic, "MTD") != 0) { - printf("LoadMTDContents called with bad filename (%s)\n", + + enum PartitionType type; + + if (strcmp(magic, "MTD") == 0) { + type = MTD; + } else if (strcmp(magic, "EMMC") == 0) { + type = EMMC; + } else { + printf("LoadPartitionContents called with bad filename (%s)\n", filename); return -1; } @@ -131,7 +160,7 @@ int LoadMTDContents(const char* filename, FileContents* file) { } } if (colons < 3 || colons%2 == 0) { - printf("LoadMTDContents called with bad filename (%s)\n", + printf("LoadPartitionContents called with bad filename (%s)\n", filename); } @@ -144,7 +173,7 @@ int LoadMTDContents(const char* filename, FileContents* file) { const char* size_str = strtok(NULL, ":"); size[i] = strtol(size_str, NULL, 10); if (size[i] == 0) { - printf("LoadMTDContents called with bad size (%s)\n", filename); + printf("LoadPartitionContents called with bad size (%s)\n", filename); return -1; } sha1sum[i] = strtok(NULL, ":"); @@ -156,23 +185,38 @@ int LoadMTDContents(const char* filename, FileContents* file) { size_array = size; qsort(index, pairs, sizeof(int), compare_size_indices); - if (!mtd_partitions_scanned) { - mtd_scan_partitions(); - mtd_partitions_scanned = 1; - } + MtdReadContext* ctx = NULL; + FILE* dev = NULL; - const MtdPartition* mtd = mtd_find_partition_by_name(partition); - if (mtd == NULL) { - printf("mtd partition \"%s\" not found (loading %s)\n", - partition, filename); - return -1; - } + switch (type) { + case MTD: + if (!mtd_partitions_scanned) { + mtd_scan_partitions(); + mtd_partitions_scanned = 1; + } - MtdReadContext* ctx = mtd_read_partition(mtd); - if (ctx == NULL) { - printf("failed to initialize read of mtd partition \"%s\"\n", - partition); - return -1; + const MtdPartition* mtd = mtd_find_partition_by_name(partition); + if (mtd == NULL) { + printf("mtd partition \"%s\" not found (loading %s)\n", + partition, filename); + return -1; + } + + ctx = mtd_read_partition(mtd); + if (ctx == NULL) { + printf("failed to initialize read of mtd partition \"%s\"\n", + partition); + return -1; + } + break; + + case EMMC: + dev = fopen(partition, "rb"); + if (dev == NULL) { + printf("failed to open emmc partition \"%s\": %s\n", + partition, strerror(errno)); + return -1; + } } SHA_CTX sha_ctx; @@ -191,7 +235,15 @@ int LoadMTDContents(const char* filename, FileContents* file) { size_t next = size[index[i]] - file->size; size_t read = 0; if (next > 0) { - read = mtd_read_data(ctx, p, next); + switch (type) { + case MTD: + read = mtd_read_data(ctx, p, next); + break; + + case EMMC: + read = fread(p, 1, next, dev); + break; + } if (next != read) { printf("short read (%d bytes of %d) for partition \"%s\"\n", read, next, partition); @@ -220,7 +272,7 @@ int LoadMTDContents(const char* filename, FileContents* file) { if (memcmp(sha_so_far, parsed_sha, SHA_DIGEST_SIZE) == 0) { // we have a match. stop reading the partition; we'll return // the data we've read so far. - printf("mtd read matched size %d sha %s\n", + printf("partition read matched size %d sha %s\n", size[index[i]], sha1sum[index[i]]); break; } @@ -228,12 +280,21 @@ int LoadMTDContents(const char* filename, FileContents* file) { p += read; } - mtd_read_close(ctx); + switch (type) { + case MTD: + mtd_read_close(ctx); + break; + + case EMMC: + fclose(dev); + break; + } + if (i == pairs) { // Ran off the end of the list of (size,sha1) pairs without // finding a match. - printf("contents of MTD partition \"%s\" didn't match %s\n", + printf("contents of partition \"%s\" didn't match %s\n", partition, filename); free(file->data); file->data = NULL; @@ -292,61 +353,87 @@ int SaveFileContents(const char* filename, FileContents file) { return 0; } -// Write a memory buffer to target_mtd partition, a string of the form -// "MTD:<partition>[:...]". Return 0 on success. -int WriteToMTDPartition(unsigned char* data, size_t len, - const char* target_mtd) { - char* partition = strchr(target_mtd, ':'); - if (partition == NULL) { - printf("bad MTD target name \"%s\"\n", target_mtd); - return -1; - } - ++partition; - // Trim off anything after a colon, eg "MTD:boot:blah:blah:blah...". - // We want just the partition name "boot". - partition = strdup(partition); - char* end = strchr(partition, ':'); - if (end != NULL) - *end = '\0'; - - if (!mtd_partitions_scanned) { - mtd_scan_partitions(); - mtd_partitions_scanned = 1; - } +// Write a memory buffer to 'target' partition, a string of the form +// "MTD:<partition>[:...]" or "EMMC:<partition_device>:". Return 0 on +// success. +int WriteToPartition(unsigned char* data, size_t len, + const char* target) { + char* copy = strdup(target); + const char* magic = strtok(copy, ":"); - const MtdPartition* mtd = mtd_find_partition_by_name(partition); - if (mtd == NULL) { - printf("mtd partition \"%s\" not found for writing\n", partition); + enum PartitionType type; + if (strcmp(magic, "MTD") == 0) { + type = MTD; + } else if (strcmp(magic, "EMMC") == 0) { + type = EMMC; + } else { + printf("WriteToPartition called with bad target (%s)\n", target); return -1; } + const char* partition = strtok(NULL, ":"); - MtdWriteContext* ctx = mtd_write_partition(mtd); - if (ctx == NULL) { - printf("failed to init mtd partition \"%s\" for writing\n", - partition); + if (partition == NULL) { + printf("bad partition target name \"%s\"\n", target); return -1; } - size_t written = mtd_write_data(ctx, (char*)data, len); - if (written != len) { - printf("only wrote %d of %d bytes to MTD %s\n", - written, len, partition); - mtd_write_close(ctx); - return -1; - } + switch (type) { + case MTD: + if (!mtd_partitions_scanned) { + mtd_scan_partitions(); + mtd_partitions_scanned = 1; + } - if (mtd_erase_blocks(ctx, -1) < 0) { - printf("error finishing mtd write of %s\n", partition); - mtd_write_close(ctx); - return -1; - } + const MtdPartition* mtd = mtd_find_partition_by_name(partition); + if (mtd == NULL) { + printf("mtd partition \"%s\" not found for writing\n", + partition); + return -1; + } - if (mtd_write_close(ctx)) { - printf("error closing mtd write of %s\n", partition); - return -1; + MtdWriteContext* ctx = mtd_write_partition(mtd); + if (ctx == NULL) { + printf("failed to init mtd partition \"%s\" for writing\n", + partition); + return -1; + } + + size_t written = mtd_write_data(ctx, (char*)data, len); + if (written != len) { + printf("only wrote %d of %d bytes to MTD %s\n", + written, len, partition); + mtd_write_close(ctx); + return -1; + } + + if (mtd_erase_blocks(ctx, -1) < 0) { + printf("error finishing mtd write of %s\n", partition); + mtd_write_close(ctx); + return -1; + } + + if (mtd_write_close(ctx)) { + printf("error closing mtd write of %s\n", partition); + return -1; + } + break; + + case EMMC: + ; + FILE* f = fopen(partition, "wb"); + if (fwrite(data, 1, len, f) != len) { + printf("short write writing to %s (%s)\n", + partition, strerror(errno)); + return -1; + } + if (fclose(f) != 0) { + printf("error closing %s (%s)\n", partition, strerror(errno)); + return -1; + } + break; } - free(partition); + free(copy); return 0; } @@ -406,10 +493,10 @@ int applypatch_check(const char* filename, file.data = NULL; // It's okay to specify no sha1s; the check will pass if the - // LoadFileContents is successful. (Useful for reading MTD + // LoadFileContents is successful. (Useful for reading // partitions, where the filename encodes the sha1s; no need to // check them twice.) - if (LoadFileContents(filename, &file) != 0 || + if (LoadFileContents(filename, &file, RETOUCH_DO_MASK) != 0 || (num_patches > 0 && FindMatchingPatch(file.sha1, patch_sha1_str, num_patches) < 0)) { printf("file \"%s\" doesn't have any of expected " @@ -423,7 +510,7 @@ int applypatch_check(const char* filename, // exists and matches the sha1 we're looking for, the check still // passes. - if (LoadFileContents(CACHE_TEMP_SOURCE, &file) != 0) { + if (LoadFileContents(CACHE_TEMP_SOURCE, &file, RETOUCH_DO_MASK) != 0) { printf("failed to load cache file\n"); return 1; } @@ -518,8 +605,8 @@ int CacheSizeCheck(size_t bytes) { // - otherwise, or if any error is encountered, exits with non-zero // status. // -// <source_filename> may refer to an MTD partition to read the source -// data. See the comments for the LoadMTDContents() function above +// <source_filename> may refer to a partition to read the source data. +// See the comments for the LoadPartition Contents() function above // for the format of such a filename. int applypatch(const char* source_filename, @@ -549,7 +636,8 @@ int applypatch(const char* source_filename, int made_copy = 0; // We try to load the target file into the source_file object. - if (LoadFileContents(target_filename, &source_file) == 0) { + if (LoadFileContents(target_filename, &source_file, + RETOUCH_DO_MASK) == 0) { if (memcmp(source_file.sha1, target_sha1, SHA_DIGEST_SIZE) == 0) { // The early-exit case: the patch was already applied, this file // has the desired hash, nothing for us to do. @@ -565,7 +653,8 @@ int applypatch(const char* source_filename, // Need to load the source file: either we failed to load the // target file, or we did but it's different from the source file. free(source_file.data); - LoadFileContents(source_filename, &source_file); + LoadFileContents(source_filename, &source_file, + RETOUCH_DO_MASK); } if (source_file.data != NULL) { @@ -580,7 +669,8 @@ int applypatch(const char* source_filename, free(source_file.data); printf("source file is bad; trying copy\n"); - if (LoadFileContents(CACHE_TEMP_SOURCE, ©_file) < 0) { + if (LoadFileContents(CACHE_TEMP_SOURCE, ©_file, + RETOUCH_DO_MASK) < 0) { // fail. printf("failed to read copy file\n"); return 1; @@ -623,14 +713,16 @@ int applypatch(const char* source_filename, // Is there enough room in the target filesystem to hold the patched // file? - if (strncmp(target_filename, "MTD:", 4) == 0) { - // If the target is an MTD partition, we're actually going to - // write the output to /tmp and then copy it to the partition. - // statfs() always returns 0 blocks free for /tmp, so instead - // we'll just assume that /tmp has enough space to hold the file. + if (strncmp(target_filename, "MTD:", 4) == 0 || + strncmp(target_filename, "EMMC:", 5) == 0) { + // If the target is a partition, we're actually going to + // write the output to /tmp and then copy it to the + // partition. statfs() always returns 0 blocks free for + // /tmp, so instead we'll just assume that /tmp has enough + // space to hold the file. - // We still write the original source to cache, in case the MTD - // write is interrupted. + // We still write the original source to cache, in case + // the partition write is interrupted. if (MakeFreeSpaceOnCache(source_file.size) < 0) { printf("not enough free space on /cache\n"); return 1; @@ -661,11 +753,13 @@ int applypatch(const char* source_filename, // copy the source file to cache, then delete it from the original // location. - if (strncmp(source_filename, "MTD:", 4) == 0) { + if (strncmp(source_filename, "MTD:", 4) == 0 || + strncmp(source_filename, "EMMC:", 5) == 0) { // It's impossible to free space on the target filesystem by - // deleting the source if the source is an MTD partition. If + // deleting the source if the source is a partition. If // we're ever in a state where we need to do this, fail. - printf("not enough free space for target but source is MTD\n"); + printf("not enough free space for target but source " + "is partition\n"); return 1; } @@ -704,7 +798,8 @@ int applypatch(const char* source_filename, void* token = NULL; output = -1; outname = NULL; - if (strncmp(target_filename, "MTD:", 4) == 0) { + if (strncmp(target_filename, "MTD:", 4) == 0 || + strncmp(target_filename, "EMMC:", 5) == 0) { // We store the decoded output in memory. msi.buffer = malloc(target_size); if (msi.buffer == NULL) { @@ -780,8 +875,8 @@ int applypatch(const char* source_filename, } if (output < 0) { - // Copy the temp file to the MTD partition. - if (WriteToMTDPartition(msi.buffer, msi.pos, target_filename) != 0) { + // Copy the temp file to the partition. + if (WriteToPartition(msi.buffer, msi.pos, target_filename) != 0) { printf("write of patched data to %s failed\n", target_filename); return 1; } diff --git a/applypatch/applypatch.h b/applypatch/applypatch.h index 10c01259a..a78c89bfe 100644 --- a/applypatch/applypatch.h +++ b/applypatch/applypatch.h @@ -19,6 +19,7 @@ #include <sys/stat.h> #include "mincrypt/sha.h" +#include "minelf/Retouch.h" #include "edify/expr.h" typedef struct _Patch { @@ -59,10 +60,12 @@ int applypatch_check(const char* filename, int num_patches, char** const patch_sha1_str); -// Read a file into memory; store it and its associated metadata in -// *file. Return 0 on success. -int LoadFileContents(const char* filename, FileContents* file); +int LoadFileContents(const char* filename, FileContents* file, + int retouch_flag); +int SaveFileContents(const char* filename, FileContents file); void FreeFileContents(FileContents* file); +int FindMatchingPatch(uint8_t* sha1, char** const patch_sha1_str, + int num_patches); // bsdiff.c void ShowBSDiffLicense(); diff --git a/applypatch/main.c b/applypatch/main.c index 3917f86ed..7025a2e2e 100644 --- a/applypatch/main.c +++ b/applypatch/main.c @@ -74,7 +74,7 @@ static int ParsePatchArgs(int argc, char** argv, (*patches)[i] = NULL; } else { FileContents fc; - if (LoadFileContents(colon, &fc) != 0) { + if (LoadFileContents(colon, &fc, RETOUCH_DONT_MASK) != 0) { goto abort; } (*patches)[i] = malloc(sizeof(Value)); |