upx_fd_android.c
modified: stub/src/upxfd_android.c
This commit is contained in:
John Reiser
parent
58d9b00a0a
commit
33b9c68677
@ -145,150 +145,6 @@ extern int fstatat(int dirfd, const char *restrict pathname,
|
||||
#define ENOSPC 28 /* no space left on device */
|
||||
#define ENOSYS 38 /* no such system call */
|
||||
|
||||
#if ANDROID_FRIEND //{
|
||||
|
||||
extern void *memset(void *dst, int val, size_t n);
|
||||
extern int stat(char const *path, struct stat *statbuf);
|
||||
extern int mkdir(char const *path, unsigned mode);
|
||||
|
||||
__attribute__((__noinline__))
|
||||
static int dir_check(char const *path, int fatal)
|
||||
{
|
||||
struct stat sb;
|
||||
memset(&sb,0xff, sizeof(sb)); // DEBUG aid
|
||||
int rv = stat(path, &sb);
|
||||
if (0 <= rv) {
|
||||
if (S_IFDIR == (sb.st_mode & S_IFMT)) {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
if (-ENOENT == rv) {
|
||||
rv = mkdir(path, S_IRWXU);
|
||||
}
|
||||
if (rv < 0 && fatal) {
|
||||
my_bkpt(path, rv); // required path not available
|
||||
}
|
||||
return rv;
|
||||
}
|
||||
|
||||
//#define S_IRWXU 00700 /* rwx------ User Read-Write-eXecute */
|
||||
extern void *alloca(unsigned size);
|
||||
//#include <string.h> // we use "typedef unsigned size_t;"
|
||||
//#include <sys/utsname.h>
|
||||
|
||||
extern unsigned getpid(void);
|
||||
extern void *mempcpy(void *dst, void const *src, unsigned len);
|
||||
|
||||
// Upper half of ASCII (chars 0100-0177) are all legal in a Linux filename.
|
||||
// So the shortest code is " return 0100 + (077 & x); "
|
||||
// But the 5 chars which follow 'Z' ("[\\]^_") or 'z' ("{|}~\x7F")
|
||||
// look ugly, so substitute digits.
|
||||
__attribute__((__noinline__))
|
||||
static unsigned sixbit(unsigned x)
|
||||
{
|
||||
unsigned y = 037 & x; // "upper case"
|
||||
x &= 077;
|
||||
if (033 <= y) { // last 5 chars in each 32 are ugly
|
||||
if (040 & x) // "lower case"
|
||||
x += '4' - 'z'; // "56789" follows 'z';
|
||||
else
|
||||
x += '/' - 'Z'; // "01234" follows 'Z';
|
||||
}
|
||||
x += 0100; // upper half ASCII: "@ABC"...
|
||||
return x;
|
||||
}
|
||||
|
||||
#define PATH_MAX 4096 /* linux/include/uapi/linux/limits.h */
|
||||
|
||||
// Where to put temp file when memfd_create() fails on early 32-bit Android
|
||||
__attribute__((__noinline__))
|
||||
static int create_upxfn_path(char *name, char *buf)
|
||||
{
|
||||
// Construct path "/data/data/$APP_NAME/cache/upxAAA".
|
||||
// Note 'mempcpy' [with 'p' in the middle!] returns the end-of-string.
|
||||
char *p = mempcpy(&name[0], addr_string("/data/data/"), 11); // '/' sentinel at end
|
||||
p[0] = '\0'; dir_check(name, 1);
|
||||
|
||||
// Append the name of the app
|
||||
char const *q = addr_string("/proc/self/cmdline");
|
||||
int fd = open(q, O_RDONLY, 0);
|
||||
int rlen = read(fd, p= buf, -1+ PATH_MAX);
|
||||
close(fd);
|
||||
if (rlen < 0) {
|
||||
my_bkpt(q);
|
||||
}
|
||||
p[rlen] = '\0'; // insurance sentinel
|
||||
// Kernel-parsed arguments are separated by '\0'.
|
||||
while (*p) ++p; // advance to end of argv[0]
|
||||
|
||||
{
|
||||
char *app_end = p;
|
||||
// Sentinel '/' at name[10] provides safety for backing up.
|
||||
while ('/' != *p) --p; // find last component of argv[0]
|
||||
q = p;
|
||||
p = mempcpy(&name[10], p, app_end - p);
|
||||
p[0] = '\0';
|
||||
if (-EACCES == dir_check(name, 0)) {
|
||||
p = mempcpy(&name[11], addr_string("com.termux/files"), 16);
|
||||
p = mempcpy(p, q, app_end - q);
|
||||
p[0] = '\0';
|
||||
dir_check(name, 1);
|
||||
}
|
||||
}
|
||||
|
||||
p = mempcpy(p, addr_string("/cache"), 6);
|
||||
p[0] = '\0'; dir_check(name, 1);
|
||||
p = mempcpy(p, addr_string("/upx"), 4);
|
||||
pid_t pid = getpid();
|
||||
p[0] = sixbit(pid >> 0*6);
|
||||
p[1] = sixbit(pid >> 1*6);
|
||||
p[2] = sixbit(pid >> 2*6);
|
||||
p[3]='\0';
|
||||
return 0; // success
|
||||
}
|
||||
|
||||
// memfd_create() gets ENOSYS on early Android. There are 32-bit x86 Android
|
||||
// such as Zenfone 2 (discontinued 2018?), x86 Chromebooks (2019 and later),
|
||||
// FydeOS, Windows subsystem for Android. But the main use is for developing,
|
||||
// to make Android emulator running on x86_64 (Linux or Windows) run faster
|
||||
// by emulating x86 instead of ARM.
|
||||
//
|
||||
// Try /data/data/$APP_NAME/cache/upxAAA
|
||||
// where APP_NAME is discovered as basename(argv[0])
|
||||
// and argv[0] is guessed from /proc/self/cmdline.
|
||||
// Also 32-bit Android has inconsistent __NR_ftruncate,
|
||||
// so use direct write()
|
||||
//
|
||||
struct utsname {
|
||||
char sysname[65];
|
||||
char nodename[65];
|
||||
char release[65];
|
||||
char version[65];
|
||||
char machine[65];
|
||||
char domainname[65];
|
||||
|
||||
};
|
||||
extern int uname(struct utsname *);
|
||||
extern char * get_upxfn_path(void);
|
||||
|
||||
// To work around bug in "i386-linux-gcc-3.4.6 -m32 -march=i386" .
|
||||
// gcc optimized out this code:
|
||||
// uname((struct utsname *)buf);
|
||||
// int const is_android = ( (('r'<<3*8)|('d'<<2*8)|('n'<<1*8)|('a'<<0*8))
|
||||
// == (0x20202020 | *(int *)buf) );
|
||||
// Specialized: does NOT consider early termination of either string, etc.
|
||||
__attribute__((__noinline__))
|
||||
static int strncmplc(char const *s1, char const *s2, unsigned n)
|
||||
{
|
||||
while (n--) {
|
||||
int rv = (0x20 | *s1++) - (0x20 | *s2++);
|
||||
if (rv) return rv;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif //} ANDROID_FRIEND
|
||||
|
||||
// ANDROID_TEST: Set to 1 for testing Android implmentation using Linux on
|
||||
// Raspberry Pi (arm32, perhaps running on actual arm64); else set to 0.
|
||||
#define ANDROID_TEST 0
|
||||
@ -298,11 +154,36 @@ static int strncmplc(char const *s1, char const *s2, unsigned n)
|
||||
#define O_DIRECTORY 0200000 /* 0x010000 */
|
||||
#define O_TMPFILE 020000000 /* 0x400000 */
|
||||
|
||||
#define PATH_MAX 4096 /* linux/include/uapi/linux/limits.h */
|
||||
|
||||
extern int memfd_create(char const *name, unsigned flags);
|
||||
extern int ftruncate(int fd, size_t length);
|
||||
extern ssize_t write(int fd, void const *buf, size_t length);
|
||||
|
||||
unsigned long upx_mmap_and_fd( // returns (mapped_addr | (1+ fd))
|
||||
// upx_mmap_and_fd_android() must be first in the .o when compiled,
|
||||
// so prototype 'static' functions but put their definitions later.
|
||||
#if ANDROID_FRIEND //{
|
||||
static int strncmplc(char const *s1, char const *s2, unsigned n);
|
||||
static int create_upxfn_path(char *name, char *buf);
|
||||
static unsigned sixbit(unsigned x);
|
||||
static int dir_check(char const *path, int fatal);
|
||||
#endif //}
|
||||
|
||||
struct utsname {
|
||||
char sysname[65];
|
||||
char nodename[65];
|
||||
char release[65];
|
||||
char version[65];
|
||||
char machine[65];
|
||||
char domainname[65];
|
||||
};
|
||||
extern void *memset(void *dst, int val, size_t n);
|
||||
extern int stat(char const *path, struct stat *statbuf);
|
||||
extern int mkdir(char const *path, unsigned mode);
|
||||
extern int uname(struct utsname *);
|
||||
extern char * get_upxfn_path(void);
|
||||
|
||||
unsigned long upx_mmap_and_fd_android( // returns (mapped_addr | (1+ fd))
|
||||
void *ptr // desired address
|
||||
, unsigned datlen // mapped length
|
||||
, char *pathname // 0 ==> get_upxfn_path()
|
||||
@ -374,7 +255,7 @@ unsigned long upx_mmap_and_fd( // returns (mapped_addr | (1+ fd))
|
||||
#endif //}
|
||||
|
||||
// Set the file length
|
||||
unsigned const frag = frag_mask & (unsigned)ptr;
|
||||
unsigned const frag = frag_mask & (unsigned)(long)ptr;
|
||||
ptr -= frag; // page-aligned
|
||||
datlen += frag;
|
||||
if (datlen) {
|
||||
@ -410,6 +291,132 @@ unsigned long upx_mmap_and_fd( // returns (mapped_addr | (1+ fd))
|
||||
return addr | (1+ fd);
|
||||
}
|
||||
|
||||
#if ANDROID_FRIEND //{
|
||||
|
||||
__attribute__((__noinline__))
|
||||
static int dir_check(char const *path, int fatal)
|
||||
{
|
||||
struct stat sb;
|
||||
memset(&sb,0xff, sizeof(sb)); // DEBUG aid
|
||||
int rv = stat(path, &sb);
|
||||
if (0 <= rv) {
|
||||
if (S_IFDIR == (sb.st_mode & S_IFMT)) {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
if (-ENOENT == rv) {
|
||||
rv = mkdir(path, S_IRWXU);
|
||||
}
|
||||
if (rv < 0 && fatal) {
|
||||
my_bkpt(path, rv); // required path not available
|
||||
}
|
||||
return rv;
|
||||
}
|
||||
|
||||
//#define S_IRWXU 00700 /* rwx------ User Read-Write-eXecute */
|
||||
extern void *alloca(unsigned size);
|
||||
//#include <string.h> // we use "typedef unsigned size_t;"
|
||||
//#include <sys/utsname.h>
|
||||
|
||||
extern unsigned getpid(void);
|
||||
extern void *mempcpy(void *dst, void const *src, unsigned len);
|
||||
|
||||
// Upper half of ASCII (chars 0100-0177) are all legal in a Linux filename.
|
||||
// So the shortest code is " return 0100 + (077 & x); "
|
||||
// But the 5 chars which follow 'Z' ("[\\]^_") or 'z' ("{|}~\x7F")
|
||||
// look ugly, so substitute digits.
|
||||
__attribute__((__noinline__))
|
||||
static unsigned sixbit(unsigned x)
|
||||
{
|
||||
unsigned y = 037 & x; // "upper case"
|
||||
x &= 077;
|
||||
if (033 <= y) { // last 5 chars in each 32 are ugly
|
||||
if (040 & x) // "lower case"
|
||||
x += '4' - 'z'; // "56789" follows 'z';
|
||||
else
|
||||
x += '/' - 'Z'; // "01234" follows 'Z';
|
||||
}
|
||||
x += 0100; // upper half ASCII: "@ABC"...
|
||||
return x;
|
||||
}
|
||||
|
||||
// Where to put temp file when memfd_create() fails on early 32-bit Android
|
||||
__attribute__((__noinline__))
|
||||
static int create_upxfn_path(char *name, char *buf)
|
||||
{
|
||||
// Construct path "/data/data/$APP_NAME/cache/upxAAA".
|
||||
// Note 'mempcpy' [with 'p' in the middle!] returns the end-of-string.
|
||||
char *p = mempcpy(&name[0], addr_string("/data/data/"), 11); // '/' sentinel at end
|
||||
p[0] = '\0'; dir_check(name, 1);
|
||||
|
||||
// Append the name of the app
|
||||
char const *q = addr_string("/proc/self/cmdline");
|
||||
int fd = open(q, O_RDONLY, 0);
|
||||
int rlen = read(fd, p= buf, -1+ PATH_MAX);
|
||||
close(fd);
|
||||
if (rlen < 0) {
|
||||
my_bkpt(q);
|
||||
}
|
||||
p[rlen] = '\0'; // insurance sentinel
|
||||
// Kernel-parsed arguments are separated by '\0'.
|
||||
while (*p) ++p; // advance to end of argv[0]
|
||||
|
||||
{
|
||||
char *app_end = p;
|
||||
// Sentinel '/' at name[10] provides safety for backing up.
|
||||
while ('/' != *p) --p; // find last component of argv[0]
|
||||
q = p;
|
||||
p = mempcpy(&name[10], p, app_end - p);
|
||||
p[0] = '\0';
|
||||
if (-EACCES == dir_check(name, 0)) {
|
||||
p = mempcpy(&name[11], addr_string("com.termux/files"), 16);
|
||||
p = mempcpy(p, q, app_end - q);
|
||||
p[0] = '\0';
|
||||
dir_check(name, 1);
|
||||
}
|
||||
}
|
||||
|
||||
p = mempcpy(p, addr_string("/cache"), 6);
|
||||
p[0] = '\0'; dir_check(name, 1);
|
||||
p = mempcpy(p, addr_string("/upx"), 4);
|
||||
pid_t pid = getpid();
|
||||
p[0] = sixbit(pid >> 0*6);
|
||||
p[1] = sixbit(pid >> 1*6);
|
||||
p[2] = sixbit(pid >> 2*6);
|
||||
p[3]='\0';
|
||||
return 0; // success
|
||||
}
|
||||
|
||||
// memfd_create() gets ENOSYS on early Android. There are 32-bit x86 Android
|
||||
// such as Zenfone 2 (discontinued 2018?), x86 Chromebooks (2019 and later),
|
||||
// FydeOS, Windows subsystem for Android. But the main use is for developing,
|
||||
// to make Android emulator running on x86_64 (Linux or Windows) run faster
|
||||
// by emulating x86 instead of ARM.
|
||||
//
|
||||
// Try /data/data/$APP_NAME/cache/upxAAA
|
||||
// where APP_NAME is discovered as basename(argv[0])
|
||||
// and argv[0] is guessed from /proc/self/cmdline.
|
||||
// Also 32-bit Android has inconsistent __NR_ftruncate,
|
||||
// so use direct write()
|
||||
//
|
||||
// To work around bug in "i386-linux-gcc-3.4.6 -m32 -march=i386" .
|
||||
// gcc optimized out this code:
|
||||
// uname((struct utsname *)buf);
|
||||
// int const is_android = ( (('r'<<3*8)|('d'<<2*8)|('n'<<1*8)|('a'<<0*8))
|
||||
// == (0x20202020 | *(int *)buf) );
|
||||
// Specialized: does NOT consider early termination of either string, etc.
|
||||
__attribute__((__noinline__))
|
||||
static int strncmplc(char const *s1, char const *s2, unsigned n)
|
||||
{
|
||||
while (n--) {
|
||||
int rv = (0x20 | *s1++) - (0x20 | *s2++);
|
||||
if (rv) return rv;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif //} ANDROID_FRIEND
|
||||
|
||||
#if 0 //{ test
|
||||
char name[1000];
|
||||
|
||||
@ -437,3 +444,4 @@ void *memset(void *adst, unsigned val, unsigned len)
|
||||
return adst;
|
||||
}
|
||||
#endif //}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user