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handle execveat systemcall on McKernel

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Refs: #1366
Change-Id: I921e04a0df8d0d798fc94f675e5112dd2fec190a
This commit is contained in:
Ken Sato
2019-11-14 10:56:28 +09:00
parent d052acab1d
commit 7fc4272b89
10 changed files with 356 additions and 10 deletions
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50
executer/user/mcexec.c
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@ -3521,6 +3521,39 @@ again:
return ret;
}
/* for execveat */
static int getpath_execveat(int dirfd, const char *filename, int flags,
char *pathbuf, size_t size)
{
int rc, ret = 0;
size_t len;
if (filename[0] == '/' || dirfd == AT_FDCWD) {
len = snprintf(pathbuf, size, "%s", filename);
}
else if (flags & AT_EMPTY_PATH && filename[0] == '\0') {
len = snprintf(pathbuf, size, "/dev/fd/%d", dirfd);
}
else {
len = snprintf(pathbuf, size, "/dev/fd/%d/%s", dirfd, filename);
}
if (len >= size) {
ret = ENAMETOOLONG;
goto out;
}
if (flags & AT_SYMLINK_NOFOLLOW) {
if ((rc = readlink(filename, pathbuf, PATH_MAX)) != -1) {
ret = ELOOP;
goto out;
}
}
out:
return ret;
}
int main_loop(struct thread_data_s *my_thread)
{
struct syscall_wait_desc w;
@ -3929,6 +3962,7 @@ fork_err:
break;
}
/* Actually, performing execveat() for McKernel */
case __NR_execve: {
/* Execve phase */
@ -3940,15 +3974,25 @@ fork_err:
char *shebang_argv_flat;
char *buffer;
size_t size;
int ret;
int ret, dirfd, flags;
/* Load descriptor phase */
case 1:
shebang_argv = NULL;
buffer = NULL;
desc = NULL;
filename = (char *)w.sr.args[1];
dirfd = (int)w.sr.args[1];
filename = (char *)w.sr.args[2];
flags = (int)w.sr.args[4];
ret = getpath_execveat(dirfd,
filename, flags,
pathbuf, PATH_MAX);
if (ret) {
goto return_execve1;
}
filename = pathbuf;
if ((ret = load_elf_desc_shebang(filename, &desc,
&shebang_argv, 0)) != 0) {
goto return_execve1;
@ -3987,7 +4031,7 @@ fork_err:
/* Copy descriptor to co-kernel side */
trans.userp = buffer;
trans.rphys = w.sr.args[2];
trans.rphys = w.sr.args[3];
trans.size = size;
trans.direction = MCEXEC_UP_TRANSFER_TO_REMOTE;