Magic-Mirror/radare2
1
0
Fork 0
mirror of https://github.com/radareorg/radare2.git synced 2024-12-01 00:51:19 +00:00
Code Issues Actions 6 Packages Projects Releases Wiki Activity

Handle 'int 0x20' as eob on x86-16 (assume DOS) ##analysis

Browse Source
This commit is contained in:
pancake 2023-05-03 19:58:53 +02:00 committed by pancake
parent ba3a6c3ca1
commit da2a3ed2d2
2 changed files with 42 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
libr/anal/p/anal_x86_cs.c
View File

@ -3317,6 +3317,12 @@ static void anop(RAnal *a, RAnalOp *op, ut64 addr, const ut8 *buf, int len, csh
case X86_INS_INT:
op->type = R_ANAL_OP_TYPE_SWI;
op->val = (int)INSOP(0).imm;
if (a->config->bits == 16 && op->val == 0x20) {
// TODO: Ccheck for >-config->os == "DOS"
// "int 0x20" -> terminate program on DOS
op->eob = true; // looks like eob is ignored if optype is not trap :?
op->type = R_ANAL_OP_TYPE_TRAP;
}
break;
case X86_INS_SYSCALL:
case X86_INS_SYSENTER:

37
test/db/anal/x86_16
View File

@ -261,4 +261,39 @@ EXPECT=<<EOF
EOF
RUN
NAME=int 0x20
FILE=bins/mz/INSTALL.EXE
CMDS=<<EOF
af
pdf
EOF
EXPECT=<<EOF
;-- section.seg_000:
;-- mz.dos_header:
/ 50: entry0 ();
| 0000:0000 b8800b mov ax, 0xb80 ; [00] -rwx section size 16818 named seg_000
| 0000:0003 ba1c04 mov dx, 0x41c
| 0000:0006 050000 add ax, 0 ; RELOC 16
| 0000:0009 3b060200 cmp ax, word [2] ; [0x2:2]=0xba0b
| ,=< 0000:000d 731a jae 0x29
| | 0000:000f 2d2000 sub ax, 0x20
| | 0000:0012 fa cli
| | 0000:0013 8ed0 mov ss, ax
| | 0000:0015 fb sti
| | 0000:0016 2d1900 sub ax, 0x19
| | ; DATA XREF from entry0 @ 0x16(r)
| | 0000:0019 8ec0 mov es, ax
| | 0000:001b 50 push ax
| | 0000:001c b9c700 mov cx, 0xc7
| | 0000:001f 33ff xor di, di
| | 0000:0021 57 push di
| | 0000:0022 be4401 mov si, 0x144
| | 0000:0025 fc cld
| | 0000:0026 f3a5 rep movsw word es:[di], word [si]
| | 0000:0028 cb retf
| `-> 0000:0029 b409 mov ah, 9
| 0000:002b ba3201 mov dx, 0x132
| 0000:002e cd21 int 0x21
\ 0000:0030 cd20 int 0x20
EOF
RUN