Add execveat syscall

deislabs · Nov 29, 2021 · ca9139e · ca9139e
1 parent 6c8ab64
commit ca9139e
Show file tree

Hide file tree

Showing 5 changed files with 461 additions and 162 deletions.
diff --git a/include/myst/syscall.h b/include/myst/syscall.h
@@ -348,12 +348,18 @@ long myst_syscall_fchownat(
     gid_t group,
     int flags);
 
+#define FB_PATH_NOT_EMPTY 0x0000
+#define FB_TYPE_FILE 0x0001
+#define FB_TYPE_DIRECTORY 0x0010
+#define FB_THROW_ERROR_NOFOLLOW 0x00010000
+
 /* Used by XXXXXat() syscalls */
 long myst_get_absolute_path_from_dirfd(
     int dirfd,
-    const char* filename,
+    const char* pathname,
     int flags,
-    char** abspath_out);
+    char** abspath_out,
+    const int flags_behavior);
 
 long myst_syscall_get_process_stack(void** stack, size_t* stack_size);
 

diff --git a/kernel/chown.c b/kernel/chown.c
@@ -229,14 +229,15 @@ long myst_syscall_fchownat(
     if ((flags & ~(AT_EMPTY_PATH | AT_SYMLINK_NOFOLLOW)) != 0)
         ERAISE(-EINVAL);
 
-    ECHECK(myst_get_absolute_path_from_dirfd(dirfd, pathname, flags, &abspath));
-
-    if (*abspath == '\0')
+    if (*pathname == '\0' && (flags & AT_EMPTY_PATH) && dirfd != AT_FDCWD)
     {
         ECHECK(myst_syscall_fchown(dirfd, owner, group));
     }
     else
     {
+        ECHECK(myst_get_absolute_path_from_dirfd(
+            dirfd, pathname, flags, &abspath, FB_PATH_NOT_EMPTY));
+
         if (flags & AT_SYMLINK_NOFOLLOW)
         {
             ECHECK(myst_syscall_lchown(abspath, owner, group));