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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: OTBezwRsW+zcx1dPqKhfKxNKZkBOaOrw/xqYBrMHrXexKmBwXPcyHbvok3PaUZRH0/7wnJJKomA1/oadmc4iXIHq1gzsFb5fax4kTHnwBDQ= X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR10MB4276 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-07-08_15,2024-07-08_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 suspectscore=0 malwarescore=0 bulkscore=0 mlxscore=0 spamscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2406180000 definitions=main-2407090052 X-Proofpoint-GUID: 39aSoIHoyvy68BdxZ2NSiJLHkVTm4dhC X-Proofpoint-ORIG-GUID: 39aSoIHoyvy68BdxZ2NSiJLHkVTm4dhC On 7/8/24 18:48, Borislav Petkov wrote: > On Mon, Jul 08, 2024 at 11:49:24AM -0000, tip-bot2 for Alexandre Chartre wrote: >> 4c 8b 24 25 e0 ff ff mov 0xffffffffffffffe0,%r12 > > Right, this is missing a "ff" which is the 4th byte of a disp32. > > I.e., ModRM=0, SIB=5 simply means that what follows is a disp32 field: > > REX: 0x4c { 4 [w]: 1 [r]: 1 [x]: 0 [b]: 0 } > Opcode: 0x8b > ModRM: 0x24 [mod:0b][.R:1b,reg:1100b][.B:0b,r/m:100b] > register-indirect mode, offset 0 > SIB: 0x25 [.B:0b,base:101b][.X:0b,idx:100b][scale: 0] > > MOV Gv,Ev; MOV reg{16,32,64} reg/mem{16,32,64} > 0: 4c 8b 24 25 e0 ff ff mov 0xffffffffffffffe0,%r12 > 7: ff Ah! Right. I regularly got tricked when the opcode is output on two lines :-( Sorry. alex.