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PackVmlinuzI386 detects relocatable kernel (cannot handle yet)

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John Reiser
2007-11-20 12:01:50 -08:00
parent 000309b47f
commit b36a42cd0a
1 changed files with 12 additions and 6 deletions
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src/p_vmlinz.cpp
+12 -6
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@@ -133,14 +133,20 @@ int PackVmlinuzI386::decompressKernel()
fi->seek(0, SEEK_SET); fi->seek(0, SEEK_SET);
fi->readx(obuf, file_size); fi->readx(obuf, file_size);
// Find "ljmp $__BOOT_CS,$__PHYSICAL_START" if any.
// See startup_32: in linux/arch/i386/boot/compressed/head.S // See startup_32: in linux/arch/i386/boot/compressed/head.S
char const *p = (char const *)&obuf[setup_size]; char const *p = (char const *)&obuf[setup_size];
for (int j= 0; j < 0x200; ++j, ++p) for (int j= 0; j < 0x200; ++j, ++p) {
if (0==memcmp("\xEA\x00\x00", p, 3) && 0==(0xf & p[3]) && 0==p[4]) { if (0==memcmp("\xE8\x00\x00\x00\x00\x5D", p, 6)) {
/* whole megabyte < 16MB */ /* "call 1f; 1f: pop %ebp" determines actual execution address; */
physical_start = get_le32(1+ p); /* linux-2.6.21 (spring 2007) and later; upx stub needs work. */
break; throwCantPack("Relocatable kernel is not yet supported");
}
// Find "ljmp $__BOOT_CS,$__PHYSICAL_START" if any.
if (0==memcmp("\xEA\x00\x00", p, 3) && 0==(0xf & p[3]) && 0==p[4]) {
/* whole megabyte < 16MB */
physical_start = get_le32(1+ p);
break;
}
} }
checkAlreadyPacked(obuf + setup_size, UPX_MIN(file_size - setup_size, (off_t)1024)); checkAlreadyPacked(obuf + setup_size, UPX_MIN(file_size - setup_size, (off_t)1024));