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Android 9、11往vendor.img增加文件#xff0c;烧写到设备后发现增加的可执行文件没有执行权限。经过漫长查找#xff0c;终于找到了问题的根源#xff0c;谨以此篇献给哪些脚踏实地的人们。
根本原因
system/core/libcutils/fs_config.cpp文件#xff0c;fs_confi…问题
Android 9、11往vendor.img增加文件烧写到设备后发现增加的可执行文件没有执行权限。经过漫长查找终于找到了问题的根源谨以此篇献给哪些脚踏实地的人们。
根本原因
system/core/libcutils/fs_config.cpp文件fs_config函数根据android_dirs、android_files中的配置修改文件的uid、gui、mode(权限)。除了/vendor/bin/、/vendor/xbin/目录下的文件的有执行权限/vendor目录下的其他文件都没有执行权限。
vendor.img是如何生成的
build/core/Makefile
INSTALLED_VENDORIMAGE_TARGET
3314 # We just build this directly to the install location.
3315 INSTALLED_VENDORIMAGE_TARGET : $(BUILT_VENDORIMAGE_TARGET)
3316 $(INSTALLED_VENDORIMAGE_TARGET): \
3317 $(INTERNAL_USERIMAGES_DEPS) \
3318 $(INTERNAL_VENDORIMAGE_FILES) \
3319 $(INSTALLED_FILES_FILE_VENDOR) \
3320 $(RECOVERY_FROM_BOOT_PATCH)
3321 $(build-vendorimage-target)
build-vendorimage-target
BUILT_VENDORIMAGE_TARGET
3294 vendorimage_intermediates : \
3295 $(call intermediates-dir-for,PACKAGING,vendor)
3296 BUILT_VENDORIMAGE_TARGET : $(PRODUCT_OUT)/vendor.img
3297 define build-vendorimage-target
3298 # $(hide) /usr/bin/python build/tools/rcmerge.py $(subst full_,,$(TARGET_PRODUCT)) vnd
3299 $(call pretty,Target vendor fs image: $(INSTALLED_VENDORIMAGE_TARGET))
3300 mkdir -p $(TARGET_OUT_VENDOR)
3301 rm -rf $(TARGET_OUT_VENDOR)/avm
3302 mkdir -p $(TARGET_OUT_VENDOR)/avm
3303 $(call create-vendor-odm-symlink)
3304 mkdir -p $(vendorimage_intermediates) rm -rf $(vendorimage_intermediates)/vendor_image_info.txt
3305 $(hide) cp -rf $(TOP)/vendor/autochips/proprietary/frameworks/base/avm/file/* $(TARGET_OUT_VENDOR)/avm
3306 $(call generate-image-prop-dictionary, $(vendorimage_intermediates)/vendor_image_info.txt,vendor,skip_fscktrue)
3307 PATH$(INTERNAL_USERIMAGES_BINARY_PATHS):$$PATH \
3308 $(BUILD_IMAGE) \
3309 $(TARGET_OUT_VENDOR) $(vendorimage_intermediates)/vendor_image_info.txt \
3310 $(INSTALLED_VENDORIMAGE_TARGET) $(TARGET_OUT)
3311 $(call assert-max-image-size,$(INSTALLED_VENDORIMAGE_TARGET) $(RECOVERY_FROM_BOOT_PATCH),$(BOARD_VENDORIMAGE_PARTITION_SIZE))
3312 endef
build_image
build/core/config.mk
635 BUILD_IMAGE : $(HOST_OUT_EXECUTABLES)/build_image$(HOST_EXECUTABLE_SUFFIX)
out/host/linux-x86/bin/build_image
Builds output_image from the given input_directory, properties_file,
and writes the image to target_output_directory.Usage: build_image input_directory properties_file output_image \target_output_directorybuild_image.py
build/tools/releasetools/build_image.py
BuildImageMkfs
231 def BuildImageMkfs(in_dir, prop_dict, out_file, target_out, fs_config):
232 Builds a pure image for the files under in_dir and writes it to out_file.
233
234 Args:
235 in_dir: Path to input directory.
236 prop_dict: A property dict that contains info like partition size. Values
237 will be updated with computed values.
238 out_file: The output image file.
239 target_out: Path to the TARGET_OUT directory as in Makefile. It actually
240 points to the /system directory under PRODUCT_OUT. fs_config (the one
241 under system/core/libcutils) reads device specific FS config files from
242 there.
243 fs_config: The fs_config file that drives the prototype
244
245 Raises:
246 BuildImageError: On build image failures.
247 build_command
mkuserimg_mke2fs -s out/target/product/ac8257_64bit/vendor out/target/product/ac8257_64bit/vendor.img ext4 vendor 825540608 -j 0 -D out/target/product/ac8257_64bit/system -L vendor -M 0 --inode_size 256 out/target/product/ac8257_64bit/obj/ETC/file_contexts.bin_intermediates/file_contexts.bin
mkuserimg_mke2fs.py
system/extras/ext4_utils/mkuserimg_mke2fs.py
mke2fs
Usage: mke2fs [-c|-l filename] [-b block-size] [-C cluster-size][-i bytes-per-inode] [-I inode-size] [-J journal-options][-G flex-group-size] [-N number-of-inodes] [-d root-directory][-m reserved-blocks-percentage] [-o creator-os][-g blocks-per-group] [-L volume-label] [-M last-mounted-directory][-O feature[,...]] [-r fs-revision] [-E extended-option[,...]][-t fs-type] [-T usage-type ] [-U UUID] [-e errors_behavior][-z undo_file][-jnqvDFSV] device [blocks-count]
MKE2FS_CONFIGout/soong/.temp/tmpGyRCz5mke2fs -O ^has_journal -L vendor -I 256 -M /vendor -m 0 -E android_sparse -t ext4 -b 4096 out/target/product/ac8257_64bit/vendor.img 201548
e2fsdroid
e2fsdroid -p out/target/product/ac8257_64bit/system -S out/target/product/ac8257_64bit/obj/ETC/file_contexts.bin_intermediates/file_contexts.bin -f out/target/product/ac8257_64bit/vendor -a /vendor out/target/product/ac8257_64bit/vendor.img
file_contexts
obj/ETC/file_contexts.bin_intermediates
system/sepolicy/private/file_contexts
device/autochips/sepolicy/basic/plat_private/file_contexts
device/autochips/sepolicy/bsp/plat_private/file_contexts
SetUpInDirAndFsConfig
e2fsdroid源在何处
external/e2fsprogs/contrib/android/e2fsdroid.c
Usage
e2fsdroid [-B block_list] [-D basefs_out] [-T timestamp][-C fs_config] [-S file_contexts] [-p product_out][-a mountpoint] [-d basefs_in] [-f src_dir] [-e] [-s] image
android_configure_fs
326 errcode_t android_configure_fs(ext2_filsys fs, char *src_dir, char *target_out,
327 char *mountpoint,
328 struct selinux_opt *seopts EXT2FS_ATTR((unused)),
329 unsigned int nopt EXT2FS_ATTR((unused)),
330 char *fs_config_file, time_t fixed_time,
331 const struct ugid_map* uid_map,
332 const struct ugid_map* gid_map)
333 {359 /* Load the FS config */
360 if (fs_config_file) {
361 retval load_canned_fs_config(fs_config_file);
362 if (retval 0) {
363 com_err(__func__, retval,
364 _(while loading fs_config \%s\),
365 fs_config_file);
366 return retval;
367 }
368 fs_config_func canned_fs_config;
369 } else if (mountpoint)
370 fs_config_func fs_config;
371
372 return __android_configure_fs(fs, src_dir, target_out, mountpoint,
373 fs_config_func, sehnd, fixed_time,
374 uid_map, gid_map);
375 }fs_config
system/core/libcutils/fs_config.cpp文件fs_config函数根据android_dirs、android_files中的配置修改文件的uid、gui、mode(权限)。除了/vendor/bin/、/vendor/xbin/目录下的文件的有执行权限/vendor目录下的其他文件都没有执行权限。
366 for (pc dir ? android_dirs : android_files; pc-prefix; pc) {
367 if (fs_config_cmp(dir, pc-prefix, strlen(pc-prefix), path, plen)) {
368 break;
369 }
370 }
371 *uid pc-uid;
372 *gid pc-gid;
373 *mode (*mode (~07777)) | pc-mode;
374 *capabilities pc-capabilities;
375 }android_dirs 59 static const struct fs_path_config android_dirs[] {60 // clang-format off61 { 00770, AID_SYSTEM, AID_CACHE, 0, cache },62 { 00555, AID_ROOT, AID_ROOT, 0, config },63 { 00771, AID_SYSTEM, AID_SYSTEM, 0, data/app },64 { 00771, AID_SYSTEM, AID_SYSTEM, 0, data/app-private },65 { 00771, AID_SYSTEM, AID_SYSTEM, 0, data/app-ephemeral },66 { 00771, AID_ROOT, AID_ROOT, 0, data/dalvik-cache },67 { 00771, AID_SYSTEM, AID_SYSTEM, 0, data/data },68 { 00771, AID_SHELL, AID_SHELL, 0, data/local/tmp },69 { 00771, AID_SHELL, AID_SHELL, 0, data/local },70 { 00770, AID_DHCP, AID_DHCP, 0, data/misc/dhcp },71 { 00771, AID_SHARED_RELRO, AID_SHARED_RELRO, 0, data/misc/shared_relro },72 { 01771, AID_SYSTEM, AID_MISC, 0, data/misc },73 { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, data/media/Music },74 { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, data/media },75 { 00750, AID_ROOT, AID_SHELL, 0, data/nativetest },76 { 00750, AID_ROOT, AID_SHELL, 0, data/nativetest64 },77 { 00750, AID_ROOT, AID_SHELL, 0, data/benchmarktest },78 { 00750, AID_ROOT, AID_SHELL, 0, data/benchmarktest64 },79 { 00775, AID_ROOT, AID_ROOT, 0, data/preloads },80 { 00771, AID_SYSTEM, AID_SYSTEM, 0, data },81 { 00755, AID_ROOT, AID_SYSTEM, 0, mnt },82 { 00751, AID_ROOT, AID_SHELL, 0, product/bin },83 { 00777, AID_ROOT, AID_ROOT, 0, sdcard },84 { 00751, AID_ROOT, AID_SDCARD_R, 0, storage },85 { 00751, AID_ROOT, AID_SHELL, 0, system/bin },86 { 00755, AID_ROOT, AID_ROOT, 0, system/etc/ppp },87 { 00755, AID_ROOT, AID_SHELL, 0, system/vendor },88 { 00751, AID_ROOT, AID_SHELL, 0, system/xbin },89 { 00751, AID_ROOT, AID_SHELL, 0, system/apex/*/bin },90 { 00751, AID_ROOT, AID_SHELL, 0, system_ext/bin },91 { 00751, AID_ROOT, AID_SHELL, 0, system_ext/apex/*/bin },92 { 00751, AID_ROOT, AID_SHELL, 0, vendor/bin },93 { 00755, AID_ROOT, AID_SHELL, 0, vendor },94 { 00755, AID_ROOT, AID_ROOT, 0, 0 },95 // clang-format on96 };
android_files
139 static const struct fs_path_config android_files[] {
140 // clang-format off
141 { 00644, AID_SYSTEM, AID_SYSTEM, 0, data/app/* },
142 { 00644, AID_SYSTEM, AID_SYSTEM, 0, data/app-ephemeral/* },
143 { 00644, AID_SYSTEM, AID_SYSTEM, 0, data/app-private/* },
144 { 00644, AID_APP, AID_APP, 0, data/data/* },
145 { 00644, AID_MEDIA_RW, AID_MEDIA_RW, 0, data/media/* },
146 { 00640, AID_ROOT, AID_SHELL, 0, data/nativetest/tests.txt },
147 { 00640, AID_ROOT, AID_SHELL, 0, data/nativetest64/tests.txt },
148 { 00750, AID_ROOT, AID_SHELL, 0, data/nativetest/* },
149 { 00750, AID_ROOT, AID_SHELL, 0, data/nativetest64/* },
150 { 00750, AID_ROOT, AID_SHELL, 0, data/benchmarktest/* },
151 { 00750, AID_ROOT, AID_SHELL, 0, data/benchmarktest64/* },
152 { 00600, AID_ROOT, AID_ROOT, 0, default.prop }, // legacy
153 { 00600, AID_ROOT, AID_ROOT, 0, system/etc/prop.default },
154 { 00600, AID_ROOT, AID_ROOT, 0, odm/build.prop }, // legacy; only for P release
155 { 00600, AID_ROOT, AID_ROOT, 0, odm/default.prop }, // legacy; only for P release
156 { 00600, AID_ROOT, AID_ROOT, 0, odm/etc/build.prop },
157 { 00444, AID_ROOT, AID_ROOT, 0, odm_conf_dir 1 },
158 { 00444, AID_ROOT, AID_ROOT, 0, odm_conf_file 1 },
159 { 00444, AID_ROOT, AID_ROOT, 0, oem_conf_dir 1 },
160 { 00444, AID_ROOT, AID_ROOT, 0, oem_conf_file 1 },
161 { 00600, AID_ROOT, AID_ROOT, 0, product/build.prop },
162 { 00444, AID_ROOT, AID_ROOT, 0, product_conf_dir 1 },
163 { 00444, AID_ROOT, AID_ROOT, 0, product_conf_file 1 },
164 { 00600, AID_ROOT, AID_ROOT, 0, system_ext/build.prop },
165 { 00444, AID_ROOT, AID_ROOT, 0, system_ext_conf_dir 1 },
166 { 00444, AID_ROOT, AID_ROOT, 0, system_ext_conf_file 1 },
167 { 00755, AID_ROOT, AID_SHELL, 0, system/bin/crash_dump32 },
168 { 00755, AID_ROOT, AID_SHELL, 0, system/bin/crash_dump64 },
169 { 00755, AID_ROOT, AID_SHELL, 0, system/bin/debuggerd },
170 { 00550, AID_LOGD, AID_LOGD, 0, system/bin/logd },
171 { 00700, AID_ROOT, AID_ROOT, 0, system/bin/secilc },
172 { 00750, AID_ROOT, AID_ROOT, 0, system/bin/uncrypt },
173 { 00600, AID_ROOT, AID_ROOT, 0, system/build.prop },
174 { 00444, AID_ROOT, AID_ROOT, 0, sys_conf_dir 1 },
175 { 00444, AID_ROOT, AID_ROOT, 0, sys_conf_file 1 },
176 { 00440, AID_ROOT, AID_SHELL, 0, system/etc/init.goldfish.rc },
177 { 00550, AID_ROOT, AID_SHELL, 0, system/etc/init.goldfish.sh },
178 { 00550, AID_ROOT, AID_SHELL, 0, system/etc/init.ril },
179 { 00555, AID_ROOT, AID_ROOT, 0, system/etc/ppp/* },
180 { 00555, AID_ROOT, AID_ROOT, 0, system/etc/rc.* },
181 { 00750, AID_ROOT, AID_ROOT, 0, vendor/bin/install-recovery.sh },
182 { 00600, AID_ROOT, AID_ROOT, 0, vendor/build.prop },
183 { 00600, AID_ROOT, AID_ROOT, 0, vendor/default.prop },
184 { 00440, AID_ROOT, AID_ROOT, 0, vendor/etc/recovery.img },
185 { 00444, AID_ROOT, AID_ROOT, 0, ven_conf_dir 1 },
186 { 00444, AID_ROOT, AID_ROOT, 0, ven_conf_file 1 },
187
188 // the following two files are INTENTIONALLY set-uid, but they
189 // are NOT included on user builds.
190 { 06755, AID_ROOT, AID_ROOT, 0, system/xbin/procmem },
191 { 04750, AID_ROOT, AID_SHELL, 0, system/xbin/su },
192
193 // the following files have enhanced capabilities and ARE included
194 // in user builds.
195 { 00700, AID_SYSTEM, AID_SHELL, CAP_MASK_LONG(CAP_BLOCK_SUSPEND),
196 system/bin/inputflinger },
197 { 00750, AID_ROOT, AID_SHELL, CAP_MASK_LONG(CAP_SETUID) |
198 CAP_MASK_LONG(CAP_SETGID),
199 system/bin/run-as },
200 { 00750, AID_ROOT, AID_SHELL, CAP_MASK_LONG(CAP_SETUID) |
201 CAP_MASK_LONG(CAP_SETGID),
202 system/bin/simpleperf_app_runner },
203 { 00755, AID_ROOT, AID_ROOT, 0, first_stage_ramdisk/system/bin/e2fsck },
204 { 00755, AID_ROOT, AID_ROOT, 0, first_stage_ramdisk/system/bin/tune2fs },
205 { 00755, AID_ROOT, AID_ROOT, 0, first_stage_ramdisk/system/bin/resize2fs },
206 // generic defaults
207 { 00755, AID_ROOT, AID_ROOT, 0, bin/* },
208 { 00640, AID_ROOT, AID_SHELL, 0, fstab.* },
209 { 00750, AID_ROOT, AID_SHELL, 0, init* },
210 { 00755, AID_ROOT, AID_SHELL, 0, odm/bin/* },
211 { 00755, AID_ROOT, AID_SHELL, 0, product/bin/* },
212 { 00755, AID_ROOT, AID_SHELL, 0, system/bin/* },
213 { 00755, AID_ROOT, AID_SHELL, 0, system/xbin/* },
214 { 00755, AID_ROOT, AID_SHELL, 0, system/apex/*/bin/* },
215 { 00755, AID_ROOT, AID_SHELL, 0, system_ext/bin/* },
216 { 00755, AID_ROOT, AID_SHELL, 0, system_ext/apex/*/bin/* },
217 { 00755, AID_ROOT, AID_SHELL, 0, vendor/bin/* },
218 { 00755, AID_ROOT, AID_SHELL, 0, vendor/xbin/* },
219 { 00771, AID_ROOT, AID_SYSTEM, 0, avm/* },
220 { 00644, AID_ROOT, AID_ROOT, 0, 0 },
221 // clang-format on
222 }; 如何调试
build_image.py
build/core
--- a/tools/releasetools/build_image.pyb/tools/releasetools/build_image.py-341,8 341,12 def BuildImageMkfs(in_dir, prop_dict, out_file, target_out, fs_config):raise BuildImageError(Error: unknown filesystem type: {}.format(fs_type)) if vendor prop_dict[mount_point]:print(build_command: %s % (build_command))try:mkfs_output common.RunAndCheckOutput(build_command)if vendor prop_dict[mount_point]:print(mkfs_output: %s % mkfs_output)except:try:du GetDiskUsage(in_dir)
mkuserimg_mke2fs.py
system/extras
--- a/ext4_utils/mkuserimg_mke2fs.pyb/ext4_utils/mkuserimg_mke2fs.py-223,6 223,7 def main(argv):if args.timestamp:mke2fs_env[E2FSPROGS_FAKE_TIME] args.timestamp print(mke2fs_cmd: %s, mke2fs_env: %s\n % (mke2fs_cmd, mke2fs_env))output, ret RunCommand(mke2fs_cmd, mke2fs_env)print(output)if ret ! 0:-234,6 235,7 def main(argv):if args.timestamp:e2fsdroid_env[E2FSPROGS_FAKE_TIME] args.timestamp print(e2fsdroid_cmd: %s, e2fsdroid_env: %s\n % (e2fsdroid_cmd, e2fsdroid_env))output, ret RunCommand(e2fsdroid_cmd, e2fsdroid_env)# The build script is parsing the raw output of e2fsdroid; keep the pattern# unchanged for now. fs_config.cpp
system/core
--- a/libcutils/fs_config.cppb/libcutils/fs_config.cpp-367,6 367,7 void fs_config(const char* path, int dir, const char* target_out_path, unsigned*break;}}printf(%s %s, prefix: %s %o\n, path, target_out_path, pc-prefix, pc-mode);*uid pc-uid;*gid pc-gid;*mode (*mode (~07777)) | pc-mode;
