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exeflat: support signal byte (clc/stc) to indicate compression to kernel

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This commit is contained in:
C. Masloch 2022-05-21 14:54:06 +02:00 committed by Kenneth J Davis
parent f51c8a5304
commit ad368a4420
1 changed files with 29 additions and 3 deletions
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32
utils/exeflat.c
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@ -90,7 +90,7 @@ static void usage(void)
static int exeflat(const char *srcfile, const char *dstfile, static int exeflat(const char *srcfile, const char *dstfile,
const char *start, short *silentSegments, short silentcount, const char *start, short *silentSegments, short silentcount,
int UPX, exe_header *header) int UPX, int patchsignal, exe_header *header)
{ {
int i, j; int i, j;
size_t bufsize; size_t bufsize;
@ -99,6 +99,7 @@ static int exeflat(const char *srcfile, const char *dstfile,
ULONG size, to_xfer; ULONG size, to_xfer;
UBYTE **buffers; UBYTE **buffers;
UBYTE **curbuf; UBYTE **curbuf;
UBYTE *signal;
FILE *src, *dest; FILE *src, *dest;
short silentdone = 0; short silentdone = 0;
int compress_sys_file; int compress_sys_file;
@ -222,6 +223,31 @@ static int exeflat(const char *srcfile, const char *dstfile,
realentry = ((UWORD)(buffers[0][2]) << 8) + buffers[0][1] + 3; realentry = ((UWORD)(buffers[0][2]) << 8) + buffers[0][1] + 3;
} }
signal = &buffers[(size_t)(realentry / BUFSIZE)][(size_t)(realentry % BUFSIZE)];
if (patchsignal && UPX)
{
if (*signal == 0xF8) /* clc */
{
*signal = 0xF9; /* stc */
printf("Signal patched to indicate compression\n");
}
else if (*signal == 0xF9)
{
printf("Signal is already patched to indicate compression\n");
}
}
else if (patchsignal)
{
if (*signal == 0xF8) /* clc */
{
printf("Signal not patched as no compression used\n");
}
else if (*signal == 0xF9)
{
printf("Signal wrongly patched to indicate compression ??\n");
}
}
if ((dest = fopen(dstfile, "wb+")) == NULL) if ((dest = fopen(dstfile, "wb+")) == NULL)
{ {
printf("Destination file %s could not be created\n", dstfile); printf("Destination file %s could not be created\n", dstfile);
@ -423,7 +449,7 @@ int main(int argc, char **argv)
compress_sys_file = exeflat(argv[1], argv[2], argv[3], compress_sys_file = exeflat(argv[1], argv[2], argv[3],
silentSegments, silentcount, silentSegments, silentcount,
UPX, &header); UPX, 1, &header);
if (!UPX) if (!UPX)
exit(0); exit(0);
@ -470,7 +496,7 @@ int main(int argc, char **argv)
{ {
exeflat(tmpexe, argv[2], argv[3], exeflat(tmpexe, argv[2], argv[3],
silentSegments, silentcount, silentSegments, silentcount,
FALSE, &header); FALSE, 0, &header);
remove(tmpexe); remove(tmpexe);
} }