diff options
| author | Julien Thierry <julien.thierry@arm.com> | 2018-09-11 11:13:39 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-10-05 11:51:15 +0200 |
| commit | e3aa6243434fd9a82e84bb79ab1abd14f2d9a5a7 (patch) | |
| tree | a062d1fb252ca8a25467b1665959ab32affa59e9 /arch/arm/include/asm/uaccess.h | |
| parent | ARM: 8794/1: uaccess: Prevent speculative use of the current addr_limit (diff) | |
| download | linux-e3aa6243434fd9a82e84bb79ab1abd14f2d9a5a7.tar.xz linux-e3aa6243434fd9a82e84bb79ab1abd14f2d9a5a7.zip | |
ARM: 8795/1: spectre-v1.1: use put_user() for __put_user()
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>
Diffstat (limited to 'arch/arm/include/asm/uaccess.h')
| -rw-r--r-- | arch/arm/include/asm/uaccess.h | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h index 7d19584f5c39..cf50b030c62c 100644 --- a/arch/arm/include/asm/uaccess.h +++ b/arch/arm/include/asm/uaccess.h @@ -370,6 +370,14 @@ 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; \ @@ -377,12 +385,6 @@ 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; \ @@ -462,6 +464,7 @@ do { \ : "r" (x), "i" (-EFAULT) \ : "cc") +#endif /* !CONFIG_CPU_SPECTRE */ #ifdef CONFIG_MMU extern unsigned long __must_check |