x64dbg
/
zydis
mirror of https://github.com/x64dbg/zydis
1
0
Fork 0
Code Releases Activity

Fixed check for invalid gather registers in non 64-bit mode

This commit is contained in:
flobernd 2018-03-13 13:24:20 +01:00
parent 16e6d0f02b
commit 16c60185a6
No known key found for this signature in database
GPG Key ID: 9C3AE0ED4A969F10
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
src/Decoder.c
View File

@ -4279,16 +4279,20 @@ static ZydisStatus ZydisCheckErrorConditions(ZydisDecoderContext* context,
ZYDIS_UNREACHABLE;
}
// Check gather/scatter registers
// Check gather registers
if (isGather)
{
ZYDIS_ASSERT(hasVSIB);
ZYDIS_ASSERT(instruction->raw.modrm.mod != 3);
ZYDIS_ASSERT(instruction->raw.modrm.rm == 4);
const ZydisU8 dest = instruction->raw.modrm.reg | (context->cache.R << 3) |
(context->cache.R2 << 4);
const ZydisU8 index = instruction->raw.sib.index | (context->cache.X << 3) |
(context->cache.V2 << 4);
ZydisU8 dest = instruction->raw.modrm.reg;
ZydisU8 index = instruction->raw.sib.index;
if (context->decoder->machineMode == ZYDIS_MACHINE_MODE_LONG_64)
{
dest = dest | (context->cache.R << 3) | (context->cache.R2 << 4);
index = index | (context->cache.X << 3) | (context->cache.V2 << 4);
}
ZydisU8 mask = 0xFF;
switch (instruction->encoding)