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linux_x64_syscall_bpcond.py
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linux_x64_syscall_bpcond.py
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import idaapi
nn = idaapi.netnode("$ kernel")
sc = cpu.rax
cpu.rax = 0
#rather than building a big dict of handlers, this is
#a binary search based on system call #
if sc < 177:
if sc < 89:
if sc < 45:
if sc < 23:
if sc < 12:
if sc < 6:
if sc < 3:
if sc == 0: #read
pass
elif sc == 1: #write
pass
else: #2, open
msg("open(\"%s\", 0x%x, 0x%x)\n" % (idaapi.get_strlit_contents(cpu.rdi, -1, STRTYPE_C), cpu.rsi, cpu.rdx))
cpu.rax = 3
elif sc > 3:
if sc == 4: #stat
pass
else: #5, fstat
idaapi.patch_dword(cpu.rsi, 0x4000)
idaapi.patch_qword(cpu.rsi + 0x20, 0x1000)
else: #3, close
pass
elif sc > 6:
if sc < 9:
pass
elif sc > 9:
if sc == 10:
pass # 10, mprotect
else: # 11, munmap
msg("munmap(0x%x, 0x%x)\n" % (cpu.rdi, cpu.rsi))
rv = idaapi.idc_value_t()
idaapi.eval_idc_expr(rv, BADADDR, "sk3wl_munmap(0x%x, 0x%x)" % (cpu.rdi, cpu.rsi))
mmt = nn.altval(11) #KERNEL_MMAP_TOP
if mmt == cpu.rdi:
nn.altset(11, mmt + cpu.rsi) #KERNEL_MMAP_TOP
else: #mmap
msg("mmap(0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x)\n" % (cpu.rdi, cpu.rsi, cpu.rdx, cpu.r10, cpu.r8, cpu.r9))
mmt = nn.altval(11) #KERNEL_MMAP_TOP
cpu.rax = mmt - cpu.rsi
mmt = nn.altset(11, cpu.rax) #KERNEL_MMAP_TOP
rv = idaapi.idc_value_t()
idaapi.eval_idc_expr(rv, BADADDR, "sk3wl_mmap(0x%x, 0x%x, 7)" % (cpu.rax, cpu.rsi))
else: #lstat
pass
elif sc > 12:
if sc < 17:
pass
elif sc > 17:
if sc < 20:
if sc == 18: #pwrite64
pass
else: #19 readv
pass
elif sc > 20:
if sc == 21: #access
cpu.eax = -2 #ENOENT
pass
else: #22 pipe
pass
else: #writev
pass
else: #pread64
pass
else: #brk
cb = nn.altval(0) #KERNEL_BRK
if cpu.rdi == 0 or cpu.rdi == cb:
cpu.rax = cb
elif cpu.rdi < cb: #shrinking
rv = idaapi.idc_value_t()
nb = cpu.rdi & ~0xfff
idaapi.eval_idc_expr(rv, BADADDR, "sk3wl_munmap(0x%x, 0x%x)" % (nb, cb - nb))
nn.altset(0, nb) #KERNEL_BRK
cpu.rax = nb
else: #growing
rv = idaapi.idc_value_t()
nb = (cpu.rdi + 0xfff) & ~0xfff
idaapi.eval_idc_expr(rv, BADADDR, "sk3wl_mmap(0x%x, 0x%x, 7)" % (cb, nb - cb))
nn.altset(0, nb) #KERNEL_BRK
cpu.rax = nb
elif sc > 23:
if sc < 34:
pass
elif sc > 34:
if sc < 40:
if sc < 37:
pass
elif sc > 37:
if sc == 38: #setitimer
pass
else: #getpid
cpu.rax = nn.altval(1) #KERNEL_PID
else: # alarm
pass
elif sc > 40:
pass
else: # sendfile
pass
else: # pause
pass
else: #select
pass
elif sc > 45:
if sc < 67:
if sc < 56:
pass
elif sc > 56:
if sc < 61:
if sc < 58:
pass #fork, returning 0
elif sc > 58:
if sc == 59: #execve
msg("execve(\"%s\", ...)\n" % idc.get_strlit_contents(cpu.rdi, -1, STRTYPE_C))
cpu.rax = -2 # ENOENT seems reasonable since we can't do this anyway
return 1 #actually break
else: #60 exit
warning("process exited")
return 1 #actually break
else: #vfork
pass
elif sc > 61:
if sc < 64:
if sc == 62: #kill
pass
else: #uname
for i, ch in enumerate("Linux"):
idaapi.patch_byte(cpu.rdi + i, ord(ch))
for i, ch in enumerate("ubuntu"):
idaapi.patch_byte(cpu.rdi + i + 0x41, ord(ch))
for i, ch in enumerate("4.4.0-119-generic"):
idaapi.patch_byte(cpu.rdi + i + 0x82, ord(ch))
for i, ch in enumerate("#143-Ubuntu SMP Mon Apr 2 16:08:24 UTC 2018"):
idaapi.patch_byte(cpu.rdi + i + 0xc3, ord(ch))
for i, ch in enumerate("x86_64"):
idaapi.patch_byte(cpu.rdi + i + 0x104, ord(ch))
elif sc > 64:
if sc == 65: #semop
pass
else: #semctl
pass
else: #semget
pass
else: #wait4
pass
else: #clone
cpu.rax = -1 #make clone attempts fail
elif sc > 67:
if sc < 78:
pass
elif sc > 78:
if sc < 83:
if sc < 80: #getcwd
default_cwd = "/home/user\x00"
if cpu.rsi < len(default_cwd):
cpu.rax = -34 #ERANGE
else:
cpu.rax = cpu.rdi
for i, ch in enumerate(default_cwd):
idaapi.patch_byte(cpu.rdi + i, ord(ch))
elif sc > 80:
if sc == 81: #fchdir
pass
else: #rename
pass
else: #chdir
pass
elif sc > 83:
pass
else: #mkdir
pass
else: #getdents
pass
else: #shmdt
pass
else: #recvfrom
pass
elif sc > 89:
if sc < 133:
if sc < 111:
if sc < 100:
if sc < 94:
pass
elif sc > 94:
if sc < 97:
pass
elif sc > 97:
pass
else: #getrlimit
if cpu.rdi == 3: #RLIMIT_STACK
idaapi.patch_qword(cpu.rsi, 0x100000)
idaapi.patch_qword(cpu.rsi + 8, 0x100000)
#implement others
else: #lchown
pass
elif sc > 100:
if sc < 105:
if sc < 103:
if sc == 101: #ptrace
pass
else: #getuid
cpu.rax = nn.altval(3) #KERNEL_UID
elif sc > 103: #getgid
cpu.rax = nn.altval(5) #KERNEL_GID
else: #syslog
pass
elif sc > 105:
if sc < 108:
if sc == 106: #setgid
pass
else: #geteuid
cpu.rax = nn.altval(4) #KERNEL_EUID
elif sc > 108:
if sc == 109: #getpgid
pass
else: #110, getppid
cpu.rax = nn.altval(2) #KERNEL_PPID
else: #getegid
cpu.rax = nn.altval(6) #KERNEL_EGID
else: #setuid
#nn.altset(3, cpu.rax) #KERNEL_UID
pass
else: #times
pass
elif sc > 111:
pass
else: #getpgrp
pass
elif sc > 133:
pass
else: #mknod
pass
else: #readlink
msg("readlink: %s\n" % idc.get_strlit_contents(cpu.rdi, -1, STRTYPE_C))
for i, ch in enumerate("/home/user/crack_me"):
cpu.rax = i
if i > cpu.rdx:
break
idaapi.patch_byte(cpu.rsi + i, ord(ch))
elif sc > 177:
if sc < 251:
if sc < 214:
pass
elif sc > 214:
if sc < 232:
if sc < 223:
if sc < 218:
pass
elif sc > 218:
pass
else: #set_tid_address
nn.altset(8, cpu.rdi) #KERNEL_TID_ADDRESS
cpu.rax = nn.altval(7) #KERNEL_TID
elif sc > 223:
pass
else: #timer_settime
pass
elif sc > 232:
pass
else: #epoll_wait
pass
else: #epoll_ctl_old
pass
elif sc > 251:
if sc < 288:
if sc < 269:
pass
elif sc > 269:
if sc < 278:
if sc < 273:
pass
elif sc > 273:
pass
else: #set_robust_list
nn.altset(9, cpu.rsi) # KERNEL_ROBUST_LIST
nn.altset(10, cpu.rdx) # KERNEL_ROBUST_LIST_SIZE
elif sc > 278:
pass
else: #vmsplice
pass
else: #faccessat
pass
elif sc > 288:
pass
else: #accept4
pass
else: #ioprio_set
pass
else: #get_kernel_syms
pass
msg("syscall %d returning 0x%x\n" % (sc, cpu.rax))
return 0