1 #include <sys/linux-syscalls.h> 2 3 #ifndef __NR_vfork 4 #define __NR_vfork 190 5 #endif 6 7 8 .text 9 .type vfork, @function 10 .globl vfork 11 .align 4 12 13 /* Get rid of the stack modifications (popl/ret) after vfork() success. 14 * vfork is VERY sneaky. One has to be very careful about what can be done 15 * between a successful vfork and a a subsequent execve() 16 */ 17 18 vfork: 19 /* grab the return address */ 20 popl %ecx 21 movl $__NR_vfork, %eax 22 int $0x80 23 cmpl $-129, %eax 24 jb 1f 25 negl %eax 26 pushl %eax 27 call __set_errno 28 orl $-1, %eax 29 1: 30 jmp *%ecx 31
