Re: [PATCH v2 0/2] linux-user: handle /proc/self/exe with execve() syscall

[Michael Tokarev]

27.10.2022 09:40, Laurent Vivier wrote:
..
> I tried O_CLOEXEC, but it seems the fd is closed before it is needed by execveat() to re-spawn the process, so it exits with an error (something like 
> EBADF)

It works here for me with a simple test program:

#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/syscall.h>
#define AT_EMPTY_PATH           0x1000

static char *argv[] = { "ls", NULL };
static char *envp[] = { NULL };

int main(void) {
  int fd = open("/usr/bin/ls", O_RDONLY);
  fcntl(fd, F_SETFD, O_CLOEXEC);
  //execveat(fd, "", argv, envp, AT_EMPTY_PATH);
  syscall(__NR_execveat, fd, "", argv, envp, AT_EMPTY_PATH);
  return 0;
}


/mjt