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am 8597c2b3: Merge "Split the shared group data from the shared passwd data."

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* commit '8597c2b3f2ac3df9abe30378cdd3ecd559d995e7':
  Split the shared group data from the shared passwd data.
This commit is contained in:
Elliott Hughes 2014-12-18 23:15:40 +00:00 committed by Android Git Automerger
commit 7d4d229785
2 changed files with 50 additions and 37 deletions
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70
libc/bionic/stubs.cpp
View file

@ -42,18 +42,44 @@
#include "private/libc_logging.h"
#include "private/ThreadLocalBuffer.h"
GLOBAL_INIT_THREAD_LOCAL_BUFFER(stubs);
// POSIX seems to envisage an implementation where the <pwd.h> functions are
// implemented by brute-force searching with getpwent(3), and the <grp.h>
// functions are implemented similarly with getgrent(3). This means that it's
// okay for all the <grp.h> functions to share state, and all the <passwd.h>
// functions to share state, but <grp.h> functions can't clobber <passwd.h>
// functions' state and vice versa.
struct stubs_state_t {
passwd passwd_;
GLOBAL_INIT_THREAD_LOCAL_BUFFER(group);
struct group_state_t {
group group_;
char* group_members_[2];
char app_name_buffer_[32];
char group_name_buffer_[32];
};
static group_state_t* __group_state() {
LOCAL_INIT_THREAD_LOCAL_BUFFER(group_state_t*, group, sizeof(group_state_t));
if (group_tls_buffer != NULL) {
memset(group_tls_buffer, 0, sizeof(group_state_t));
group_tls_buffer->group_.gr_mem = group_tls_buffer->group_members_;
}
return group_tls_buffer;
}
GLOBAL_INIT_THREAD_LOCAL_BUFFER(passwd);
struct passwd_state_t {
passwd passwd_;
char app_name_buffer_[32];
char dir_buffer_[32];
char sh_buffer_[32];
};
static passwd_state_t* __passwd_state() {
LOCAL_INIT_THREAD_LOCAL_BUFFER(passwd_state_t*, passwd, sizeof(passwd_state_t));
return passwd_tls_buffer;
}
static int do_getpw_r(int by_name, const char* name, uid_t uid,
passwd* dst, char* buf, size_t byte_count,
passwd** result) {
@ -91,7 +117,7 @@ static int do_getpw_r(int by_name, const char* name, uid_t uid,
// pw_passwd and pw_gecos are non-POSIX and unused (always NULL) in bionic.
dst->pw_passwd = NULL;
#ifdef __LP64__
#if defined(__LP64__)
dst->pw_gecos = NULL;
#endif
@ -113,17 +139,7 @@ int getpwuid_r(uid_t uid, passwd* pwd,
return do_getpw_r(0, NULL, uid, pwd, buf, byte_count, result);
}
static stubs_state_t* __stubs_state() {
LOCAL_INIT_THREAD_LOCAL_BUFFER(stubs_state_t*, stubs, sizeof(stubs_state_t));
if (stubs_tls_buffer != NULL) {
memset(stubs_tls_buffer, 0, sizeof(stubs_state_t));
stubs_tls_buffer->group_.gr_mem = stubs_tls_buffer->group_members_;
}
return stubs_tls_buffer;
}
static passwd* android_iinfo_to_passwd(stubs_state_t* state,
static passwd* android_iinfo_to_passwd(passwd_state_t* state,
const android_id_info* iinfo) {
snprintf(state->dir_buffer_, sizeof(state->dir_buffer_), "/");
snprintf(state->sh_buffer_, sizeof(state->sh_buffer_), "/system/bin/sh");
@ -145,7 +161,7 @@ static group* android_iinfo_to_group(group* gr,
return gr;
}
static passwd* android_id_to_passwd(stubs_state_t* state, unsigned id) {
static passwd* android_id_to_passwd(passwd_state_t* state, unsigned id) {
for (size_t n = 0; n < android_id_count; ++n) {
if (android_ids[n].aid == id) {
return android_iinfo_to_passwd(state, android_ids + n);
@ -154,7 +170,7 @@ static passwd* android_id_to_passwd(stubs_state_t* state, unsigned id) {
return NULL;
}
static passwd* android_name_to_passwd(stubs_state_t* state, const char* name) {
static passwd* android_name_to_passwd(passwd_state_t* state, const char* name) {
for (size_t n = 0; n < android_id_count; ++n) {
if (!strcmp(android_ids[n].name, name)) {
return android_iinfo_to_passwd(state, android_ids + n);
@ -297,9 +313,7 @@ static void print_app_name_from_gid(const gid_t gid, char* buffer, const int buf
// AID_ISOLATED_START to AID_USER-1 -> u0_i1234
// AID_USER+ -> u1_radio, u1_a1234, u2_i1234, etc.
// returns a passwd structure (sets errno to ENOENT on failure).
static passwd* app_id_to_passwd(uid_t uid, stubs_state_t* state) {
passwd* pw = &state->passwd_;
static passwd* app_id_to_passwd(uid_t uid, passwd_state_t* state) {
if (uid < AID_APP) {
errno = ENOENT;
return NULL;
@ -316,18 +330,18 @@ static passwd* app_id_to_passwd(uid_t uid, stubs_state_t* state) {
snprintf(state->sh_buffer_, sizeof(state->sh_buffer_), "/system/bin/sh");
passwd* pw = &state->passwd_;
pw->pw_name = state->app_name_buffer_;
pw->pw_dir = state->dir_buffer_;
pw->pw_shell = state->sh_buffer_;
pw->pw_uid = uid;
pw->pw_gid = uid;
return pw;
}
// Translate a gid into the corresponding app_<gid>
// group structure (sets errno to ENOENT on failure).
static group* app_id_to_group(gid_t gid, stubs_state_t* state) {
static group* app_id_to_group(gid_t gid, group_state_t* state) {
if (gid < AID_APP) {
errno = ENOENT;
return NULL;
@ -339,13 +353,11 @@ static group* app_id_to_group(gid_t gid, stubs_state_t* state) {
gr->gr_name = state->group_name_buffer_;
gr->gr_gid = gid;
gr->gr_mem[0] = gr->gr_name;
return gr;
}
passwd* getpwuid(uid_t uid) { // NOLINT: implementing bad function.
stubs_state_t* state = __stubs_state();
passwd_state_t* state = __passwd_state();
if (state == NULL) {
return NULL;
}
@ -358,7 +370,7 @@ passwd* getpwuid(uid_t uid) { // NOLINT: implementing bad function.
}
passwd* getpwnam(const char* login) { // NOLINT: implementing bad function.
stubs_state_t* state = __stubs_state();
passwd_state_t* state = __passwd_state();
if (state == NULL) {
return NULL;
}
@ -386,7 +398,7 @@ char* getlogin() { // NOLINT: implementing bad function.
}
group* getgrgid(gid_t gid) { // NOLINT: implementing bad function.
stubs_state_t* state = __stubs_state();
group_state_t* state = __group_state();
if (state == NULL) {
return NULL;
}
@ -399,7 +411,7 @@ group* getgrgid(gid_t gid) { // NOLINT: implementing bad function.
}
group* getgrnam(const char* name) { // NOLINT: implementing bad function.
stubs_state_t* state = __stubs_state();
group_state_t* state = __group_state();
if (state == NULL) {
return NULL;
}

5
libc/private/bionic_tls.h
View file

@ -85,7 +85,8 @@ enum {
* ttyname libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
* strerror libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
* strsignal libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
* stubs libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
* passwd libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
* group libc (GLOBAL_INIT_THREAD_LOCAL_BUFFER)
* _res_key libc
* je_thread_allocated_tsd jemalloc
* je_arenas_tsd jemalloc
@ -95,7 +96,7 @@ enum {
*
*/
#define LIBC_TLS_RESERVED_SLOTS 11
#define LIBC_TLS_RESERVED_SLOTS 12
#if defined(USE_JEMALLOC)
/* jemalloc uses 5 keys for itself. */