virtio-9p: Use layered xattr approach

We would need this to make sure we handle the mapped
security model correctly for different xattr names.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

1 files changed, 5 insertions, 90 deletions

diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 57f9243..ee63033 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -12,6 +12,7 @@
  */
 #include "virtio.h"
 #include "virtio-9p.h"
+#include "virtio-9p-xattr.h"
 #include <arpa/inet.h>
 #include <pwd.h>
 #include <grp.h>
@@ -19,14 +20,6 @@
 #include <sys/un.h>
 #include <attr/xattr.h>
 
-static const char *rpath(FsContext *ctx, const char *path)
-{
-    /* FIXME: so wrong... */
-    static char buffer[4096];
-    snprintf(buffer, sizeof(buffer), "%s/%s", ctx->fs_root, path);
-    return buffer;
-}
-
 
 static int local_lstat(FsContext *fs_ctx, const char *path, struct stat *stbuf)
 {
@@ -497,103 +490,25 @@ static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)
 static ssize_t local_lgetxattr(FsContext *ctx, const char *path,
                                const char *name, void *value, size_t size)
 {
-    if ((ctx->fs_sm == SM_MAPPED) &&
-        (strncmp(name, "user.virtfs.", 12) == 0)) {
-        /*
-         * Don't allow fetch of user.virtfs namesapce
-         * in case of mapped security
-         */
-        errno = ENOATTR;
-        return -1;
-    }
-
-    return lgetxattr(rpath(ctx, path), name, value, size);
+    return v9fs_get_xattr(ctx, path, name, value, size);
 }
 
 static ssize_t local_llistxattr(FsContext *ctx, const char *path,
                                 void *value, size_t size)
 {
-    ssize_t retval;
-    ssize_t actual_len = 0;
-    char *orig_value, *orig_value_start;
-    char *temp_value, *temp_value_start;
-    ssize_t xattr_len, parsed_len = 0, attr_len;
-
-    if (ctx->fs_sm != SM_MAPPED) {
-        return llistxattr(rpath(ctx, path), value, size);
-    }
-
-    /* Get the actual len */
-    xattr_len = llistxattr(rpath(ctx, path), value, 0);
-
-    /* Now fetch the xattr and find the actual size */
-    orig_value = qemu_malloc(xattr_len);
-    xattr_len = llistxattr(rpath(ctx, path), orig_value, xattr_len);
-
-    /*
-     * For mapped security model drop user.virtfs namespace
-     * from the list
-     */
-    temp_value = qemu_mallocz(xattr_len);
-    temp_value_start = temp_value;
-    orig_value_start = orig_value;
-    while (xattr_len > parsed_len) {
-        attr_len = strlen(orig_value) + 1;
-        if (strncmp(orig_value, "user.virtfs.", 12) != 0) {
-            /* Copy this entry */
-            strcat(temp_value, orig_value);
-            temp_value  += attr_len;
-            actual_len += attr_len;
-        }
-        parsed_len += attr_len;
-        orig_value += attr_len;
-    }
-    if (!size) {
-        retval = actual_len;
-        goto out;
-    } else if (size >= actual_len) {
-        /* now copy the parsed attribute list back */
-        memset(value, 0, size);
-        memcpy(value, temp_value_start, actual_len);
-        retval = actual_len;
-        goto out;
-    }
-    errno = ERANGE;
-    retval = -1;
-out:
-    qemu_free(orig_value_start);
-    qemu_free(temp_value_start);
-    return retval;
+    return v9fs_list_xattr(ctx, path, value, size);
 }
 
 static int local_lsetxattr(FsContext *ctx, const char *path, const char *name,
                            void *value, size_t size, int flags)
 {
-    if ((ctx->fs_sm == SM_MAPPED) &&
-        (strncmp(name, "user.virtfs.", 12) == 0)) {
-        /*
-         * Don't allow fetch of user.virtfs namesapce
-         * in case of mapped security
-         */
-        errno = EACCES;
-        return -1;
-    }
-    return lsetxattr(rpath(ctx, path), name, value, size, flags);
+    return v9fs_set_xattr(ctx, path, name, value, size, flags);
 }
 
 static int local_lremovexattr(FsContext *ctx,
                               const char *path, const char *name)
 {
-    if ((ctx->fs_sm == SM_MAPPED) &&
-        (strncmp(name, "user.virtfs.", 12) == 0)) {
-        /*
-         * Don't allow fetch of user.virtfs namesapce
-         * in case of mapped security
-         */
-        errno = EACCES;
-        return -1;
-    }
-    return lremovexattr(rpath(ctx, path), name);
+    return v9fs_remove_xattr(ctx, path, name);
 }