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authorJulien Thierry <julien.thierry@arm.com>2019-01-09 12:56:09 -0500
committerDavid A. Long <dave.long@linaro.org>2019-02-13 12:08:55 -0500
commite641eeab02a9d9d8691ec817210c58232bdc9365 (patch)
treed5c8d29a5fa5bdac38616a235aecf814dd4a2e70
parent452034141eb838bb153786819258660e3dc68ab4 (diff)
downloadlinux-linaro-stable-e641eeab02a9d9d8691ec817210c58232bdc9365.tar.gz
ARM: 8795/1: spectre-v1.1: use put_user() for __put_user()
Commit e3aa6243434fd9a82e84bb79ab1abd14f2d9a5a7 upstream. When Spectre mitigation is required, __put_user() needs to include check_uaccess. This is already the case for put_user(), so just make __put_user() an alias of put_user(). Signed-off-by: Julien Thierry <julien.thierry@arm.com> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David A. Long <dave.long@linaro.org>
-rw-r--r--arch/arm/include/asm/uaccess.h15
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 9ae888775743..b61acd62cffb 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -400,6 +400,14 @@ do { \
__pu_err; \
})
+#ifdef CONFIG_CPU_SPECTRE
+/*
+ * When mitigating Spectre variant 1.1, all accessors need to include
+ * verification of the address space.
+ */
+#define __put_user(x, ptr) put_user(x, ptr)
+
+#else
#define __put_user(x, ptr) \
({ \
long __pu_err = 0; \
@@ -407,12 +415,6 @@ do { \
__pu_err; \
})
-#define __put_user_error(x, ptr, err) \
-({ \
- __put_user_switch((x), (ptr), (err), __put_user_nocheck); \
- (void) 0; \
-})
-
#define __put_user_nocheck(x, __pu_ptr, __err, __size) \
do { \
unsigned long __pu_addr = (unsigned long)__pu_ptr; \
@@ -492,6 +494,7 @@ do { \
: "r" (x), "i" (-EFAULT) \
: "cc")
+#endif /* !CONFIG_CPU_SPECTRE */
#ifdef CONFIG_MMU
extern unsigned long __must_check