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Some minor changes

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This commit is contained in:
topjohnwu 2019-12-05 16:29:45 -05:00
parent 474d65207e
commit 8cc5f096a2
3 changed files with 29 additions and 54 deletions
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40
native/jni/init/early_mount.cpp
View File

@ -20,13 +20,17 @@ struct devinfo {
static vector<devinfo> dev_list; static vector<devinfo> dev_list;
static char partname[32];
static char fstype[32];
static char block_dev[64];
static void parse_device(devinfo *dev, const char *uevent) { static void parse_device(devinfo *dev, const char *uevent) {
dev->partname[0] = '\0'; dev->partname[0] = '\0';
parse_prop_file(uevent, [=](string_view key, string_view value) -> bool { parse_prop_file(uevent, [=](string_view key, string_view value) -> bool {
if (key == "MAJOR") if (key == "MAJOR")
dev->major = atoi(value.data()); dev->major = parse_int(value.data());
else if (key == "MINOR") else if (key == "MINOR")
dev->minor = atoi(value.data()); dev->minor = parse_int(value.data());
else if (key == "DEVNAME") else if (key == "DEVNAME")
strcpy(dev->devname, value.data()); strcpy(dev->devname, value.data());
else if (key == "PARTNAME") else if (key == "PARTNAME")
@ -53,7 +57,7 @@ static void collect_devices() {
closedir(dir); closedir(dir);
} }
static dev_t setup_block(const char *partname, char *block_dev = nullptr) { static dev_t setup_block(char *block_dev = nullptr) {
if (dev_list.empty()) if (dev_list.empty())
collect_devices(); collect_devices();
for (;;) { for (;;) {
@ -84,15 +88,7 @@ static bool is_lnk(const char *name) {
return S_ISLNK(st.st_mode); return S_ISLNK(st.st_mode);
} }
void BaseInit::cleanup() { static bool read_dt_fstab(cmdline *cmd, const char *name) {
// Unmount in reverse order
for (auto &p : reversed(mount_list)) {
LOGD("Unmount [%s]\n", p.data());
umount(p.data());
}
}
bool MagiskInit::read_dt_fstab(const char *name, char *partname, char *fstype) {
char path[128]; char path[128];
int fd; int fd;
sprintf(path, "%s/fstab/%s/dev", cmd->dt_dir, name); sprintf(path, "%s/fstab/%s/dev", cmd->dt_dir, name);
@ -112,18 +108,14 @@ bool MagiskInit::read_dt_fstab(const char *name, char *partname, char *fstype) {
return false; return false;
} }
static char partname[32];
static char fstype[32];
static char block_dev[64];
#define link_root(name) \ #define link_root(name) \
if (is_lnk("/system_root" name)) \ if (is_lnk("/system_root" name)) \
cp_afc("/system_root" name, name) cp_afc("/system_root" name, name)
#define mount_root(name) \ #define mount_root(name) \
if (!is_lnk("/" #name) && read_dt_fstab(#name, partname, fstype)) { \ if (!is_lnk("/" #name) && read_dt_fstab(cmd, #name)) { \
LOGD("Early mount " #name "\n"); \ LOGD("Early mount " #name "\n"); \
setup_block(partname, block_dev); \ setup_block(block_dev); \
xmkdir("/" #name, 0755); \ xmkdir("/" #name, 0755); \
xmount(block_dev, "/" #name, fstype, MS_RDONLY, nullptr); \ xmount(block_dev, "/" #name, fstype, MS_RDONLY, nullptr); \
mount_list.emplace_back("/" #name); \ mount_list.emplace_back("/" #name); \
@ -151,7 +143,7 @@ void SARCompatInit::early_mount() {
LOGD("Early mount system_root\n"); LOGD("Early mount system_root\n");
sprintf(partname, "system%s", cmd->slot); sprintf(partname, "system%s", cmd->slot);
setup_block(partname, block_dev); setup_block(block_dev);
xmkdir("/system_root", 0755); xmkdir("/system_root", 0755);
if (xmount(block_dev, "/system_root", "ext4", MS_RDONLY, nullptr)) if (xmount(block_dev, "/system_root", "ext4", MS_RDONLY, nullptr))
xmount(block_dev, "/system_root", "erofs", MS_RDONLY, nullptr); xmount(block_dev, "/system_root", "erofs", MS_RDONLY, nullptr);
@ -213,7 +205,7 @@ void SARInit::early_mount() {
LOGD("Early mount system_root\n"); LOGD("Early mount system_root\n");
sprintf(partname, "system%s", cmd->slot); sprintf(partname, "system%s", cmd->slot);
system_dev = setup_block(partname); system_dev = setup_block();
xmkdir("/system_root", 0755); xmkdir("/system_root", 0755);
if (xmount("/dev/root", "/system_root", "ext4", MS_RDONLY, nullptr)) if (xmount("/dev/root", "/system_root", "ext4", MS_RDONLY, nullptr))
xmount("/dev/root", "/system_root", "erofs", MS_RDONLY, nullptr); xmount("/dev/root", "/system_root", "erofs", MS_RDONLY, nullptr);
@ -245,3 +237,11 @@ void SecondStageInit::early_mount() {
switch_root("/system_root"); switch_root("/system_root");
} }
void BaseInit::cleanup() {
// Unmount in reverse order
for (auto &p : reversed(mount_list)) {
LOGD("Unmount [%s]\n", p.data());
umount(p.data());
}
}

1
native/jni/init/init.h
View File

@ -55,7 +55,6 @@ protected:
raw_data self; raw_data self;
virtual void early_mount() = 0; virtual void early_mount() = 0;
bool read_dt_fstab(const char *name, char *partname, char *fstype);
bool patch_sepolicy(const char *file = "/sepolicy"); bool patch_sepolicy(const char *file = "/sepolicy");
public: public:
MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {}; MagiskInit(char *argv[], cmdline *cmd) : BaseInit(argv, cmd) {};

42
native/jni/utils/selinux.cpp
View File

@ -55,61 +55,37 @@ static int __setcon(const char *ctx) {
static int __getfilecon(const char *path, char **ctx) { static int __getfilecon(const char *path, char **ctx) {
char buf[1024]; char buf[1024];
int rc = syscall(__NR_getxattr, path, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1); int rc = syscall(__NR_getxattr, path, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1);
if (rc < 0) { if (rc == 0)
errno = -rc; *ctx = strdup(buf);
return -1;
}
*ctx = strdup(buf);
return rc; return rc;
} }
static int __lgetfilecon(const char *path, char **ctx) { static int __lgetfilecon(const char *path, char **ctx) {
char buf[1024]; char buf[1024];
int rc = syscall(__NR_lgetxattr, path, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1); int rc = syscall(__NR_lgetxattr, path, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1);
if (rc < 0) { if (rc == 0)
errno = -rc; *ctx = strdup(buf);
return -1;
}
*ctx = strdup(buf);
return rc; return rc;
} }
static int __fgetfilecon(int fd, char **ctx) { static int __fgetfilecon(int fd, char **ctx) {
char buf[1024]; char buf[1024];
int rc = syscall(__NR_fgetxattr, fd, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1); int rc = syscall(__NR_fgetxattr, fd, XATTR_NAME_SELINUX, buf, sizeof(buf) - 1);
if (rc < 0) { if (rc == 0)
errno = -rc; *ctx = strdup(buf);
return -1;
}
*ctx = strdup(buf);
return rc; return rc;
} }
static int __setfilecon(const char *path, const char *ctx) { static int __setfilecon(const char *path, const char *ctx) {
int rc = syscall(__NR_setxattr, path, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0); return syscall(__NR_setxattr, path, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0);
if (rc) {
errno = -rc;
return -1;
}
return 0;
} }
static int __lsetfilecon(const char *path, const char *ctx) { static int __lsetfilecon(const char *path, const char *ctx) {
int rc = syscall(__NR_lsetxattr, path, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0); return syscall(__NR_lsetxattr, path, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0);
if (rc) {
errno = -rc;
return -1;
}
return 0;
} }
static int __fsetfilecon(int fd, const char *ctx) { static int __fsetfilecon(int fd, const char *ctx) {
int rc = syscall(__NR_fsetxattr, fd, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0); return syscall(__NR_fsetxattr, fd, XATTR_NAME_SELINUX, ctx, strlen(ctx) + 1, 0);
if (rc) {
errno = -rc;
return -1;
}
return 0;
} }
// Function pointers // Function pointers