tree f185c2730ff632c3decf311d9f0a580a846883f0
parent da20dfe6b50ea4c1a82797b7ee8655a370535d73
author Dmitry Kasatkin <dmitry.kasatkin@huawei.com> 1414320127 +0200
committer Mimi Zohar <zohar@linux.vnet.ibm.com> 1462109031 -0400

vfs: forbid write access when reading a file into memory

This patch is based on top of the "vfs: support for a common kernel file
loader" patch set.  In general when the kernel is reading a file into
memory it does not want anything else writing to it.

The kernel currently only forbids write access to a file being executed.
This patch extends this locking to files being read by the kernel.

Changelog:
- moved function to kernel_read_file() - Mimi
- updated patch description - Mimi

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: Luis R. Rodriguez <mcgrof@kernel.org>
Acked-by: Kees Cook <keescook@chromium.org>