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decode: Verify 3DNow! opcode validity

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This commit is contained in:
Alexis Engelke
2021-01-10 18:53:32 +01:00
parent 80df5ff47c
commit 9d7b584121
2 changed files with 24 additions and 0 deletions
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10
decode.c
View File

@@ -560,6 +560,16 @@ prefix_end:
}
}
if (UNLIKELY(instr->type == FDI_3DNOW))
{
unsigned opc3dn = instr->imm;
if (opc3dn & 0x40)
return FD_ERR_UD;
uint64_t msk = opc3dn & 0x80 ? 0x88d144d144d14400 : 0x30003000;
if (!(msk >> (opc3dn & 0x3f) & 1))
return FD_ERR_UD;
}
if (UNLIKELY(prefix_lock)) {
if (!DESC_LOCK(desc) || instr->operands[0].type != FD_OT_MEM)
return FD_ERR_UD;

14
tests/test_decode.c
View File

@@ -509,6 +509,20 @@ main(int argc, char** argv)
TEST32("\xd9\x20", "fldenv [eax]");
TEST64("\xd9\x20", "fldenv [rax]");
// 3DNow!
TEST("\x0f\x0f\xc0\x00", "UD");
TEST("\x0f\x0f\xc0\x0c", "3dnow mm0, mm0, 0xc"); // PI2FW
TEST("\x0f\x0f\xc0\x0d", "3dnow mm0, mm0, 0xd"); // PI2FD
TEST("\x0f\x0f\xc0\x0e", "UD");
TEST("\x0f\x0f\xc0\x1c", "3dnow mm0, mm0, 0x1c"); // PF2IW
TEST("\x0f\x0f\xc0\x1d", "3dnow mm0, mm0, 0x1d"); // PF2ID
TEST("\x0f\x0f\xc0\x42", "UD");
TEST("\x0f\x0f\xc0\x80", "UD");
TEST("\x0f\x0f\xc0\x8a", "3dnow mm0, mm0, 0x8a"); // PFNACC
TEST("\x0f\x0f\xc0\xa0", "3dnow mm0, mm0, 0xa0"); // PFCMPGT
TEST("\x0f\x0f\xc0\xb6", "3dnow mm0, mm0, 0xb6"); // PFRCPIT2
TEST("\x0f\x0f\xc0\xbf", "3dnow mm0, mm0, 0xbf"); // PAVGUSB
puts(failed ? "Some tests FAILED" : "All tests PASSED");
return failed ? EXIT_FAILURE : EXIT_SUCCESS;
}