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-rw-r--r--applypatch/applypatch.c311
1 files changed, 203 insertions, 108 deletions
diff --git a/applypatch/applypatch.c b/applypatch/applypatch.c
index 5debaace0..1ce7b5dab 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, &copy_file) < 0) {
+ if (LoadFileContents(CACHE_TEMP_SOURCE, &copy_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;
@@ -660,11 +752,13 @@ 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;
}
@@ -703,7 +797,8 @@ 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) {
@@ -779,8 +874,8 @@ 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;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-17 06:11:26 +0100