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| author | Brendan Higgins <brendanhiggins@google.com> | 2019-12-12 16:35:22 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-14 15:41:04 +0100 |
| commit | 0e31e3573f0cd94d7b821117db854187ffc85765 (patch) | |
| tree | 92e9ee1778e4e62a056e0fef5862b9753858885c | |
| parent | cea23efb4de2d31e72a576026b213e15d6792976 (diff) | |
| download | linux-0e31e3573f0cd94d7b821117db854187ffc85765.tar.bz2 | |
lkdtm/bugs: fix build error in lkdtm_UNSET_SMEP
When building ARCH=um with CONFIG_UML_X86=y and CONFIG_64BIT=y we get
the build errors:
drivers/misc/lkdtm/bugs.c: In function ‘lkdtm_UNSET_SMEP’:
drivers/misc/lkdtm/bugs.c:288:8: error: implicit declaration of function ‘native_read_cr4’ [-Werror=implicit-function-declaration]
cr4 = native_read_cr4();
^~~~~~~~~~~~~~~
drivers/misc/lkdtm/bugs.c:290:13: error: ‘X86_CR4_SMEP’ undeclared (first use in this function); did you mean ‘X86_FEATURE_SMEP’?
if ((cr4 & X86_CR4_SMEP) != X86_CR4_SMEP) {
^~~~~~~~~~~~
X86_FEATURE_SMEP
drivers/misc/lkdtm/bugs.c:290:13: note: each undeclared identifier is reported only once for each function it appears in
drivers/misc/lkdtm/bugs.c:297:2: error: implicit declaration of function ‘native_write_cr4’; did you mean ‘direct_write_cr4’? [-Werror=implicit-function-declaration]
native_write_cr4(cr4);
^~~~~~~~~~~~~~~~
direct_write_cr4
So specify that this block of code should only build when
CONFIG_X86_64=y *AND* CONFIG_UML is unset.
Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Acked-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20191213003522.66450-1-brendanhiggins@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/misc/lkdtm/bugs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/lkdtm/bugs.c b/drivers/misc/lkdtm/bugs.c index 9eda771d3a37..de87693cf557 100644 --- a/drivers/misc/lkdtm/bugs.c +++ b/drivers/misc/lkdtm/bugs.c @@ -278,7 +278,7 @@ void lkdtm_STACK_GUARD_PAGE_TRAILING(void) void lkdtm_UNSET_SMEP(void) { -#ifdef CONFIG_X86_64 +#if IS_ENABLED(CONFIG_X86_64) && !IS_ENABLED(CONFIG_UML) #define MOV_CR4_DEPTH 64 void (*direct_write_cr4)(unsigned long val); unsigned char *insn; |