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kernel/module: Hide vermagic header file from general use 

VERMAGIC* definitions are not supposed to be used by the drivers,
see this [1] bug report, so introduce special define to guard inclusion
of this header file and define it in kernel/modules.h and in internal
script that generates *.mod.c files.

In-tree module build:
➜  kernel git:(vermagic) ✗ make clean
➜  kernel git:(vermagic) ✗ make M=drivers/infiniband/hw/mlx5
➜  kernel git:(vermagic) ✗ modinfo drivers/infiniband/hw/mlx5/mlx5_ib.ko
filename:	/images/leonro/src/kernel/drivers/infiniband/hw/mlx5/mlx5_ib.ko
<...>
vermagic:       5.6.0+ SMP mod_unload modversions

Out-of-tree module build:
➜  mlx5 make -C /images/leonro/src/kernel clean M=/tmp/mlx5
➜  mlx5 make -C /images/leonro/src/kernel M=/tmp/mlx5
➜  mlx5 modinfo /tmp/mlx5/mlx5_ib.ko
filename:       /tmp/mlx5/mlx5_ib.ko
<...>
vermagic:       5.6.0+ SMP mod_unload modversions

[1] https://lore.kernel.org/lkml/20200411155623.GA22175@zn.tnic
Reported-by: Borislav Petkov <bp@suse.de>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Jessica Yu <jeyu@kernel.org>
Co-developed-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Leon Romanovsky 2020-04-19 18:55:06 +03:00 committed by David S. Miller
parent b4f3721981
commit 51161bfc66
3 changed files with 9 additions and 0 deletions
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5
include/linux/vermagic.h
View File

@ -1,4 +1,9 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef INCLUDE_VERMAGIC
#error "This header can be included from kernel/module.c or *.mod.c only"
#endif
#include <generated/utsrelease.h>
/* Simply sanity version stamp for modules. */

3
kernel/module.c
View File

@ -4,6 +4,9 @@
Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM.
*/
#define INCLUDE_VERMAGIC
#include <linux/export.h>
#include <linux/extable.h>
#include <linux/moduleloader.h>

1
scripts/mod/modpost.c
View File

@ -2251,6 +2251,7 @@ static void add_header(struct buffer *b, struct module *mod)
* Include build-salt.h after module.h in order to
* inherit the definitions.
*/
buf_printf(b, "#define INCLUDE_VERMAGIC\n");
buf_printf(b, "#include <linux/build-salt.h>\n");
buf_printf(b, "#include <linux/vermagic.h>\n");
buf_printf(b, "#include <linux/compiler.h>\n");