Skip to content

Commit

Permalink
update asm version to not leak file descriptors and wait for childs
Browse files Browse the repository at this point in the history
  • Loading branch information
@Francesco149
Francesco149 committed Jun 19, 2024
1 parent 5e7522d commit 15419ce
Showing 1 changed file with 82 additions and 69 deletions.
151 changes: 82 additions & 69 deletions httpd.asm
View file
Original file line number Diff line number Diff line change
@@ -1,4 +1,6 @@
; elf header see http://muppetlabs.com/~breadbox/software/tiny/teensy.html
; - code disassembled from C executable with `objconv -fnasm httpd temp.asm`
; - tweaked by prepending _start to _001 and removing the exit call
; - tiny elf header see http://muppetlabs.com/~breadbox/software/tiny/teensy.html

BITS 64

Expand Down Expand Up @@ -40,12 +42,14 @@ _start:
xor r9, r9
pop rdi
mov rsi, rsp

?_001:
push r14
push r13
push r12
mov r12, rsi
push rbp
push rbx
mov rbx, rsi
sub rsp, 8224
cmp edi, 3
jnz ?_004
Expand All @@ -62,132 +66,142 @@ _start:
lea eax, [rax+rdx-30H]
jmp ?_002

?_003: xchg al, ah
?_003: mov edx, eax
xchg dl, dh
test ax, ax
jnz ?_007
?_004: mov rbp, qword [rbx]
?_004: mov rbx, qword [r12]
mov edx, 7
mov edi, 1
lea rsi, [rel ?_033]
call ?_027
mov rdx, rbp
mov rdx, rbx
?_005: cmp byte [rdx], 0
jz ?_006
inc rdx
jmp ?_005

?_006: sub rdx, rbp
mov rsi, rbp
?_006: sub edx, ebx
mov rsi, rbx
mov edi, 1
call ?_027
mov edx, 11
mov edi, 1
lea rsi, [rel ?_034]
call ?_027
mov edi, 1
call ?_017
call ?_018
xor edx, edx
?_007: mov word [rsp+12H], dx
xor eax, eax
?_007: xorps xmm0, xmm0
xor ecx, ecx
lea rsi, [rsp+0CH]
lea rdi, [rsp+10H]
mov edx, 4
movups oword [rsp+10H], xmm0
mov qword [rsp+14H], rax
mov dword [rsp+0CH], 1
mov dword [rsp+1CH], ecx

mov word [rsp+10H], 2
mov word [rsp+12H], ax
call ?_029
mov r13d, eax
?_008: xor edx, edx
?_008: xor ecx, ecx
xor esi, esi
or edi, 0FFFFFFFFH
mov edx, 1
call ?_017
test eax, eax
jg ?_008
xor edx, edx
xor esi, esi
mov edi, r13d
call ?_023
mov ebp, eax
mov ebx, eax
test eax, eax
js ?_008
js ?_015
xor eax, eax
call ?_018
mov r12d, eax
call ?_019
mov ebp, eax
test eax, eax
jnz ?_008
mov r14, qword [rbx+10H]
lea r13, [rsp+20H]
jne ?_015
mov r13, qword [r12+10H]
lea r12, [rsp+20H]
?_009: mov edx, 8192
mov rsi, r13
mov edi, ebp
mov rsi, r12
mov edi, ebx
call ?_028
mov ebx, eax
mov r14d, eax
test eax, eax
jle ?_010
mov edx, ebx
mov rsi, r13
mov edx, r14d
mov rsi, r12
mov edi, 1
call ?_027
movsxd rax, ebx
lea rax, [r13+rax-3H]
cmp ebx, 2
lea edx, [r14-3H]
movsxd rdx, edx
add rdx, r12
cmp r14d, 2
jg ?_011
?_010: xor esi, esi
mov rdi, r14
?_010: mov rdi, r13
xor esi, esi
call ?_026
mov ebx, eax
mov r13d, eax
test eax, eax
jns ?_012
mov edx, 39
lea rsi, [rel ?_035]
mov edi, ebp
mov edi, ebx
call ?_027
jmp ?_015
jmp ?_014

?_011: cmp byte [rax], 10
?_011: cmp byte [rdx], 10
jnz ?_009
cmp byte [rax+1H], 13
cmp byte [rdx+1H], 13
jnz ?_009
cmp byte [rax+2H], 10
cmp byte [rdx+2H], 10
jnz ?_009
jmp ?_010

?_012: mov edx, 19
lea rsi, [rel ?_036]
mov edi, ebp
mov edi, ebx
call ?_027
?_013: mov edx, 8192
mov rsi, r13
mov edi, ebx
mov rsi, r12
mov edi, r13d
call ?_028
mov edx, eax
test eax, eax
jle ?_014
mov rsi, r13
mov edi, ebp
jle ?_016
mov rsi, r12
mov edi, ebx
call ?_027
test eax, eax
jns ?_013
jmp ?_015
?_014: mov ebp, 1
jmp ?_016

?_014: mov edi, ebp
mov esi, 2
call ?_022
mov edi, ebp
?_015: mov edi, ebx
call ?_025
jmp ?_016
jmp ?_008

?_015: mov r12d, 1
?_016: add rsp, 8224
mov eax, r12d
?_016:
add rsp, 8224
mov eax, ebp
pop rbx
pop rbp
pop r12
pop r13
pop r14
call ?_017
ret

?_017:
add r9, 3
add r9, 1
?_018: add r9, 3
?_019: add r9, 4
?_020: add r9, 1
?_019: add r9, 3
?_020: add r9, 4
?_021: add r9, 1
?_022: add r9, 5
?_022: add r9, 6
?_023: add r9, 2
?_024: add r9, 38
?_025: add r9, 1
Expand All @@ -199,50 +213,49 @@ _start:
syscall
ret


?_029:
push r13
mov r13, rsi
mov esi, 1
push r12
mov r12, rsi
mov esi, 1
push rbp
mov rbp, rdi
mov edi, 2
push rbx
sub rsp, 16
mov dword [rsp+0CH], edx
mov edx, 6
call ?_024
mov r8d, dword [rsp+0CH]
test eax, eax
mov r12d, eax
mov ebx, eax
jns ?_031
?_030: mov edi, 1
call ?_017
call ?_018
jmp ?_032

?_031: mov rcx, r13
?_031: mov rcx, r12
mov edx, 2
mov esi, 1
mov edi, eax
call ?_019
call ?_020
test eax, eax
jnz ?_030
mov edx, 16
mov rsi, rbp
mov edi, r12d
call ?_021
mov edi, ebx
call ?_022
test eax, eax
jnz ?_030
mov esi, 10
mov edi, r12d
call ?_020
mov edi, ebx
call ?_021
test eax, eax
jnz ?_030
?_032: add rsp, 16
mov eax, r12d
mov eax, ebx
pop rbx
pop rbp
pop r12
pop r13
ret

?_035:
Expand Down

0 comments on commit 15419ce

Please sign in to comment.