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-rw-r--r--libtar/Android.mk4
-rw-r--r--libtar/android_utils.c123
-rw-r--r--libtar/android_utils.h22
-rw-r--r--libtar/append.c27
-rw-r--r--libtar/block.c120
-rw-r--r--libtar/extract.c29
-rw-r--r--libtar/libtar.h4
7 files changed, 320 insertions, 9 deletions
diff --git a/libtar/Android.mk b/libtar/Android.mk
index c8905d93f..90a5006c5 100644
--- a/libtar/Android.mk
+++ b/libtar/Android.mk
@@ -5,7 +5,7 @@ include $(CLEAR_VARS)
LOCAL_MODULE := libtar
LOCAL_MODULE_TAGS := eng optional
-LOCAL_SRC_FILES := append.c block.c decode.c encode.c extract.c handle.c output.c util.c wrapper.c basename.c strmode.c libtar_hash.c libtar_list.c dirname.c
+LOCAL_SRC_FILES := append.c block.c decode.c encode.c extract.c handle.c output.c util.c wrapper.c basename.c strmode.c libtar_hash.c libtar_list.c dirname.c android_utils.c
LOCAL_C_INCLUDES += $(LOCAL_PATH) \
external/zlib
LOCAL_SHARED_LIBRARIES += libz libc
@@ -26,7 +26,7 @@ include $(CLEAR_VARS)
LOCAL_MODULE := libtar_static
LOCAL_MODULE_TAGS := eng optional
-LOCAL_SRC_FILES := append.c block.c decode.c encode.c extract.c handle.c output.c util.c wrapper.c basename.c strmode.c libtar_hash.c libtar_list.c dirname.c
+LOCAL_SRC_FILES := append.c block.c decode.c encode.c extract.c handle.c output.c util.c wrapper.c basename.c strmode.c libtar_hash.c libtar_list.c dirname.c android_utils.c
LOCAL_C_INCLUDES += $(LOCAL_PATH) \
external/zlib
LOCAL_STATIC_LIBRARIES += libz libc
diff --git a/libtar/android_utils.c b/libtar/android_utils.c
new file mode 100644
index 000000000..4aa3425b7
--- /dev/null
+++ b/libtar/android_utils.c
@@ -0,0 +1,123 @@
+/*
+** Copyright 2008, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+** http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <sys/types.h>
+#include <sys/xattr.h>
+#include <string.h>
+#include <linux/limits.h>
+#include <errno.h>
+
+#include "libtar.h"
+#include "android_utils.h"
+
+/* This code may come in handy later if we ever need to extend to storing more user.inode_* xattrs
+#define USER_INODE_SEPARATOR "\0"
+#define ANDROID_USER_INODE_XATTR_PREFIX "user.inode_"
+#define ANDROID_USER_INODE_XATTR_PREFIX_LEN strlen(ANDROID_USER_INODE_XATTR_PREFIX)
+
+char* scan_xattrs_for_user_inode (const char *realname, size_t *return_size)
+{
+ ssize_t size;
+ char xattr_list[PATH_MAX];
+ size = listxattr(realname, xattr_list, sizeof(xattr_list));
+ if (size < 0) {
+ return NULL;
+ }
+ char xattr[T_BLOCKSIZE];
+ char *xattr_ptr;
+ int first = 1;
+ *return_size = 0;
+ for (int i = 0; i < size; i++) {
+ if (xattr_list[i]) {
+ xattr_ptr = xattr_list + i;
+ if (strncmp(xattr_ptr, ANDROID_USER_INODE_XATTR_PREFIX, ANDROID_USER_INODE_XATTR_PREFIX_LEN) == 0) {
+ // found a user.inode xattr
+ if (first) {
+ first = 0;
+ strcpy(xattr, xattr_ptr);
+ *return_size = strlen(xattr_ptr);
+ } else {
+ char *ptr = xattr + *return_size;
+ snprintf(ptr, T_BLOCKSIZE - *return_size, "%s", xattr_ptr);
+ *return_size += strlen(xattr_ptr) + 1; // + 1 for null separator
+ if (*return_size >= T_BLOCKSIZE) {
+ *return_size = 0;
+ return NULL;
+ }
+ }
+ }
+ i += strlen(xattr_ptr);
+ }
+ }
+ if (first)
+ return NULL;
+ return strdup(xattr);
+}*/
+
+/*
+ * get_path_inode and write_path_inode were taken from frameworks/native/cmds/installd/utils.cpp
+ */
+
+static int get_path_inode(const char* path, ino_t *inode) {
+ struct stat buf;
+ memset(&buf, 0, sizeof(buf));
+ if (stat(path, &buf) != 0) {
+ printf("failed to stat %s\n", path);
+ return -1;
+ }
+ *inode = buf.st_ino;
+ return 0;
+}
+
+/**
+ * Write the inode of a specific child file into the given xattr on the
+ * parent directory. This allows you to find the child later, even if its
+ * name is encrypted.
+ */
+int write_path_inode(const char* parent, const char* name, const char* inode_xattr) {
+ ino_t inode = 0;
+ uint64_t inode_raw = 0;
+ char path[PATH_MAX];
+ snprintf(path, PATH_MAX, "%s/%s", parent, name);
+
+ if (mkdirhier(path) == -1) {
+ printf("failed to mkdirhier for %s\n", path);
+ return -1;
+ }
+
+ if (get_path_inode(path, &inode) != 0) {
+ return -1;
+ }
+
+ // Check to see if already set correctly
+ if (getxattr(parent, inode_xattr, &inode_raw, sizeof(inode_raw)) == sizeof(inode_raw)) {
+ if (inode_raw == inode) {
+ // Already set correctly; skip writing
+ return 0;
+ }
+ }
+
+ inode_raw = inode;
+ printf("setting %s on %s pointing to %s\n", inode_xattr, parent, path);
+ if (setxattr(parent, inode_xattr, &inode_raw, sizeof(inode_raw), 0) != 0 && errno != EOPNOTSUPP) {
+ printf("Failed to write xattr %s at %s (%s)\n", inode_xattr, parent, strerror(errno));
+ return -1;
+ }
+ return 0;
+}
diff --git a/libtar/android_utils.h b/libtar/android_utils.h
new file mode 100644
index 000000000..72cb9285b
--- /dev/null
+++ b/libtar/android_utils.h
@@ -0,0 +1,22 @@
+/*
+** Copyright 2008, The Android Open Source Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+** http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+
+#ifndef LIBTAR_ANDROID_UTILS_H
+#define LIBTAR_ANDROID_UTILS_H
+
+int write_path_inode(const char* parent, const char* name, const char* inode_xattr);
+
+#endif
diff --git a/libtar/append.c b/libtar/append.c
index d8ba3cad5..8896764f2 100644
--- a/libtar/append.c
+++ b/libtar/append.c
@@ -40,6 +40,7 @@
#ifdef HAVE_EXT4_CRYPT
# include "ext4crypt_tar.h"
#endif
+#include "android_utils.h"
struct tar_dev
{
@@ -172,6 +173,32 @@ tar_append_file(TAR *t, const char *realname, const char *savename)
}
}
+ /* get android user.default xattr */
+ if (TH_ISDIR(t) && t->options & TAR_STORE_ANDROID_USER_XATTR)
+ {
+ if (getxattr(realname, "user.default", NULL, 0) >= 0)
+ {
+ t->th_buf.has_user_default = 1;
+#if 1 //def DEBUG
+ printf("storing xattr user.default\n");
+#endif
+ }
+ if (getxattr(realname, "user.inode_cache", NULL, 0) >= 0)
+ {
+ t->th_buf.has_user_cache = 1;
+#if 1 //def DEBUG
+ printf("storing xattr user.inode_cache\n");
+#endif
+ }
+ if (getxattr(realname, "user.inode_code_cache", NULL, 0) >= 0)
+ {
+ t->th_buf.has_user_code_cache = 1;
+#if 1 //def DEBUG
+ printf("storing xattr user.inode_code_cache\n");
+#endif
+ }
+ }
+
/* check if it's a hardlink */
#ifdef DEBUG
puts("tar_append_file(): checking inode cache for hardlink...");
diff --git a/libtar/block.c b/libtar/block.c
index 1b3ba8242..a94ba445d 100644
--- a/libtar/block.c
+++ b/libtar/block.c
@@ -23,15 +23,27 @@
// Used to identify selinux_context in extended ('x')
// metadata. From RedHat implementation.
#define SELINUX_TAG "RHT.security.selinux="
-#define SELINUX_TAG_LEN 21
+#define SELINUX_TAG_LEN strlen(SELINUX_TAG)
// Used to identify e4crypt_policy in extended ('x')
#define E4CRYPT_TAG "TWRP.security.e4crypt="
-#define E4CRYPT_TAG_LEN 22
+#define E4CRYPT_TAG_LEN strlen(E4CRYPT_TAG)
// Used to identify Posix capabilities in extended ('x')
#define CAPABILITIES_TAG "SCHILY.xattr.security.capability="
-#define CAPABILITIES_TAG_LEN 33
+#define CAPABILITIES_TAG_LEN strlen(CAPABILITIES_TAG)
+
+// Used to identify Android user.default xattr in extended ('x')
+#define ANDROID_USER_DEFAULT_TAG "ANDROID.user.default"
+#define ANDROID_USER_DEFAULT_TAG_LEN strlen(ANDROID_USER_DEFAULT_TAG)
+
+// Used to identify Android user.inode_cache xattr in extended ('x')
+#define ANDROID_USER_CACHE_TAG "ANDROID.user.inode_cache"
+#define ANDROID_USER_CACHE_TAG_LEN strlen(ANDROID_USER_CACHE_TAG)
+
+// Used to identify Android user.inode_code_cache xattr in extended ('x')
+#define ANDROID_USER_CODE_CACHE_TAG "ANDROID.user.inode_code_cache"
+#define ANDROID_USER_CODE_CACHE_TAG_LEN strlen(ANDROID_USER_CODE_CACHE_TAG)
/* read a header block */
/* FIXME: the return value of this function should match the return value
@@ -135,6 +147,9 @@ th_read(TAR *t)
memset(&t->th_buf.cap_data, 0, sizeof(struct vfs_cap_data));
t->th_buf.has_cap_data = 0;
}
+ t->th_buf.has_user_default = 0;
+ t->th_buf.has_user_cache = 0;
+ t->th_buf.has_user_code_cache = 0;
memset(&(t->th_buf), 0, sizeof(struct tar_header));
@@ -276,7 +291,7 @@ th_read(TAR *t)
int len = strlen(buf);
// posix capabilities
char *start = strstr(buf, CAPABILITIES_TAG);
- if(start && start+CAPABILITIES_TAG_LEN < buf+len)
+ if (start && start+CAPABILITIES_TAG_LEN < buf+len)
{
start += CAPABILITIES_TAG_LEN;
memcpy(&t->th_buf.cap_data, start, sizeof(struct vfs_cap_data));
@@ -287,7 +302,7 @@ th_read(TAR *t)
} // end posix capabilities
// selinux contexts
start = strstr(buf, SELINUX_TAG);
- if(start && start+SELINUX_TAG_LEN < buf+len)
+ if (start && start+SELINUX_TAG_LEN < buf+len)
{
start += SELINUX_TAG_LEN;
char *end = strchr(start, '\n');
@@ -299,9 +314,36 @@ th_read(TAR *t)
#endif
}
} // end selinux contexts
+ // android user.default xattr
+ start = strstr(buf, ANDROID_USER_DEFAULT_TAG);
+ if (start)
+ {
+ t->th_buf.has_user_default = 1;
+#ifdef DEBUG
+ printf(" th_read(): android user.default xattr detected\n");
+#endif
+ } // end android user.default xattr
+ // android user.inode_cache xattr
+ start = strstr(buf, ANDROID_USER_CACHE_TAG);
+ if (start)
+ {
+ t->th_buf.has_user_cache = 1;
+#ifdef DEBUG
+ printf(" th_read(): android user.inode_cache xattr detected\n");
+#endif
+ } // end android user.inode_cache xattr
+ // android user.inode_code_cache xattr
+ start = strstr(buf, ANDROID_USER_CODE_CACHE_TAG);
+ if (start)
+ {
+ t->th_buf.has_user_code_cache = 1;
+#ifdef DEBUG
+ printf(" th_read(): android user.inode_code_cache xattr detected\n");
+#endif
+ } // end android user.inode_code_cache xattr
#ifdef HAVE_EXT4_CRYPT
start = strstr(buf, E4CRYPT_TAG);
- if(start && start+E4CRYPT_TAG_LEN < buf+len)
+ if (start && start+E4CRYPT_TAG_LEN < buf+len)
{
start += E4CRYPT_TAG_LEN;
char *end = strchr(start, '\n');
@@ -569,6 +611,72 @@ th_write(TAR *t)
*nlptr = '\n';
ptr += sz;
}
+ if (t->options & TAR_STORE_ANDROID_USER_XATTR)
+ {
+ if (t->th_buf.has_user_default) {
+#ifdef DEBUG
+ printf("th_write(): has android user.default xattr\n");
+#endif
+ sz = ANDROID_USER_DEFAULT_TAG_LEN + 3 + 1;
+
+ if (total_sz + sz >= T_BLOCKSIZE)
+ {
+ if (th_write_extended(t, &buf, total_sz))
+ return -1;
+ ptr = buf;
+ total_sz = sz;
+ }
+ else
+ total_sz += sz;
+
+ snprintf(ptr, T_BLOCKSIZE, "%d "ANDROID_USER_DEFAULT_TAG, (int)sz);
+ char *nlptr = ptr + sz - 1;
+ *nlptr = '\n';
+ ptr += sz;
+ }
+ if (t->th_buf.has_user_cache) {
+#ifdef DEBUG
+ printf("th_write(): has android user.inode_cache xattr\n");
+#endif
+ sz = ANDROID_USER_CACHE_TAG_LEN + 3 + 1;
+
+ if (total_sz + sz >= T_BLOCKSIZE)
+ {
+ if (th_write_extended(t, &buf, total_sz))
+ return -1;
+ ptr = buf;
+ total_sz = sz;
+ }
+ else
+ total_sz += sz;
+
+ snprintf(ptr, T_BLOCKSIZE, "%d "ANDROID_USER_CACHE_TAG, (int)sz);
+ char *nlptr = ptr + sz - 1;
+ *nlptr = '\n';
+ ptr += sz;
+ }
+ if (t->th_buf.has_user_code_cache) {
+#ifdef DEBUG
+ printf("th_write(): has android user.inode_code_cache xattr\n");
+#endif
+ sz = ANDROID_USER_CODE_CACHE_TAG_LEN + 3 + 1;
+
+ if (total_sz + sz >= T_BLOCKSIZE)
+ {
+ if (th_write_extended(t, &buf, total_sz))
+ return -1;
+ ptr = buf;
+ total_sz = sz;
+ }
+ else
+ total_sz += sz;
+
+ snprintf(ptr, T_BLOCKSIZE, "%d "ANDROID_USER_CODE_CACHE_TAG, (int)sz);
+ char *nlptr = ptr + sz - 1;
+ *nlptr = '\n';
+ ptr += sz;
+ }
+ }
if (total_sz > 0 && th_write_extended(t, &buf, total_sz)) // write any outstanding tar extended header
return -1;
diff --git a/libtar/extract.c b/libtar/extract.c
index 87ccf245f..82ed766b2 100644
--- a/libtar/extract.c
+++ b/libtar/extract.c
@@ -37,6 +37,7 @@
#ifdef HAVE_EXT4_CRYPT
# include "ext4crypt_tar.h"
#endif
+#include "android_utils.h"
const unsigned long long progress_size = (unsigned long long)(T_BLOCKSIZE);
@@ -469,7 +470,6 @@ tar_extract_blockdev(TAR *t, const char *realname)
return 0;
}
-
/* directory */
int
tar_extract_dir(TAR *t, const char *realname)
@@ -521,6 +521,33 @@ tar_extract_dir(TAR *t, const char *realname)
}
}
+ if (t->options & TAR_STORE_ANDROID_USER_XATTR)
+ {
+ if (t->th_buf.has_user_default) {
+#if 1 //def DEBUG
+ printf("tar_extract_file(): restoring android user.default xattr to %s\n", realname);
+#endif
+ if (setxattr(realname, "user.default", NULL, 0, 0) < 0) {
+ fprintf(stderr, "tar_extract_file(): failed to restore android user.default to file %s !!!\n", realname);
+ return -1;
+ }
+ }
+ if (t->th_buf.has_user_cache) {
+#if 1 //def DEBUG
+ printf("tar_extract_file(): restoring android user.inode_cache xattr to %s\n", realname);
+#endif
+ if (write_path_inode(realname, "cache", "user.inode_cache"))
+ return -1;
+ }
+ if (t->th_buf.has_user_code_cache) {
+#if 1 //def DEBUG
+ printf("tar_extract_file(): restoring android user.inode_code_cache xattr to %s\n", realname);
+#endif
+ if (write_path_inode(realname, "code_cache", "user.inode_code_cache"))
+ return -1;
+ }
+ }
+
#ifdef HAVE_EXT4_CRYPT
if(t->th_buf.e4crypt_policy != NULL)
{
diff --git a/libtar/libtar.h b/libtar/libtar.h
index 4d921247b..2d0a3d3fc 100644
--- a/libtar/libtar.h
+++ b/libtar/libtar.h
@@ -74,6 +74,9 @@ struct tar_header
#endif
int has_cap_data;
struct vfs_cap_data cap_data;
+ int has_user_default;
+ int has_user_cache;
+ int has_user_code_cache;
};
@@ -120,6 +123,7 @@ TAR;
#define TAR_USE_NUMERIC_ID 256 /* favor numeric owner over names */
#define TAR_STORE_EXT4_POL 512 /* store ext4 crypto policy */
#define TAR_STORE_POSIX_CAP 1024 /* store posix file capabilities */
+#define TAR_STORE_ANDROID_USER_XATTR 2048 /* store android user.* xattr */
/* this is obsolete - it's here for backwards-compatibility only */
#define TAR_IGNORE_MAGIC 0
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 20:06:27 +0100