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exeflat: copy original CONFIG block to the depacker header

This commit is contained in:
C. Masloch 2022-05-21 14:50:41 +02:00 committed by Kenneth J Davis
parent 6d23a787fb
commit f51c8a5304
1 changed files with 25 additions and 0 deletions
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25
utils/exeflat.c
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@ -54,6 +54,11 @@ large portions copied from task.c
#define BUFSIZE 32768u
#define KERNEL_START 0x16 /* the kernel code really starts here at 60:16 */
#define KERNEL_CONFIG_LENGTH (32 - 2 - 4)
/* 32 entrypoint structure,
2 entrypoint short jump,
4 near jump / ss:sp storage */
char kernel_config[KERNEL_CONFIG_LENGTH];
typedef struct {
UWORD off, seg;
@ -199,6 +204,14 @@ static int exeflat(const char *srcfile, const char *dstfile,
printf("\nProcessed %d relocations, %d not shown\n",
header->exRelocItems, silentdone);
if (UPX)
{
struct x {
char y[(KERNEL_CONFIG_LENGTH + 2) <= BUFSIZE ? 1 : -1];
};
memcpy(kernel_config, &buffers[0][2], KERNEL_CONFIG_LENGTH);
}
realentry = KERNEL_START;
if (buffers[0][0] == 0xeb /* jmp short */)
{
@ -289,6 +302,18 @@ static void write_header(FILE *dest, size_t size)
0xe9, 0, 0 /* 100: jmp 103 */
};
if (0 == memcmp(kernel_config, "CONFIG", 6)) {
unsigned long length = kernel_config[6] + kernel_config[7] * 256UL + 8;
if (length <= KERNEL_CONFIG_LENGTH) {
memcpy(&JumpBehindCode[2], kernel_config, length);
printf("Copied %lu bytes of kernel config block to header\n", length);
} else {
printf("Error: Found %lu bytes of kernel config block, too long!\n", length);
}
} else {
printf("Error: Found no kernel config block!\n");
}
struct x {
char y[sizeof(JumpBehindCode) == 0x20 ? 1 : -1];
};