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upx_mmap_and_fd

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modified:   stub/src/upxfd_create.c
This commit is contained in:
John Reiser 2024-10-26 09:49:26 -07:00
parent 3403b87cb7
commit 8aa3679323
1 changed files with 7 additions and 2 deletions
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9
src/stub/src/upxfd_create.c
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@ -12,6 +12,12 @@
extern void *alloca(unsigned long size);
#include "include/linux.h" // syscalls; i386 inlines via "int 0x80"
unsigned long upx_mmap_and_fd( // returns (mapped_addr | (1+ fd))
void *ptr // desired address
, unsigned datlen // mapped length
, char *pathname // 0 ==> get_upxfn_path()
)
// 1. Try memfd_create
// 2. If Android or emulator, try /data/data/$APP_NAME/cache/upxAAA
// where APP_NAME is discovered as basename($(< /proc/self/cmdline))
@ -20,14 +26,13 @@ extern void *alloca(unsigned long size);
// If not Android then ftruncate() to desired length.
// Return (mapped_addr | (1+ fd))
//
extern int upxfd_android(int len);
void *upxfd_create(void *addr, unsigned len)
{
char str_upx[] = "upx";
int fd = memfd_create(str_upx, 0);
#if defined(__arm__) || defined(__i386__) //{ workaround: android & emulators
if (fd < 0) {
extern int upxfd_android(int len);
fd = upxfd_android(len); // also emulates ftruncate(fd, len)
}
#else //}{