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-rw-r--r--fs/read_write.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/fs/read_write.c b/fs/read_write.c
index ebcbfc4f2907..b61bd3fc7154 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1820,6 +1820,25 @@ int generic_remap_file_range_prep(struct file *file_in, loff_t pos_in,
if (ret)
return ret;
+ /* If can't alter the file contents, we're done. */
+ if (!(remap_flags & REMAP_FILE_DEDUP)) {
+ /* Update the timestamps, since we can alter file contents. */
+ if (!(file_out->f_mode & FMODE_NOCMTIME)) {
+ ret = file_update_time(file_out);
+ if (ret)
+ return ret;
+ }
+
+ /*
+ * Clear the security bits if the process is not being run by
+ * root. This keeps people from modifying setuid and setgid
+ * binaries.
+ */
+ ret = file_remove_privs(file_out);
+ if (ret)
+ return ret;
+ }
+
return 1;
}
EXPORT_SYMBOL(generic_remap_file_range_prep);