diff options
| author | Julien Thierry <julien.thierry@arm.com> | 2019-01-09 12:59:20 -0500 |
|---|---|---|
| committer | David A. Long <dave.long@linaro.org> | 2019-02-13 12:08:55 -0500 |
| commit | a314849f4be4925279461236e373185265e428c5 (patch) | |
| tree | 547b084cba1521ac43dc91d548534c8c36973b9d /arch/arm/lib/copy_from_user.S | |
| parent | e641eeab02a9d9d8691ec817210c58232bdc9365 (diff) | |
ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization
Commit afaf6838f4bc896a711180b702b388b8cfa638fc upstream.
Introduce C and asm helpers to sanitize user address, taking the
address range they target into account.
Use asm helper for existing sanitization in __copy_from_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>
Diffstat (limited to 'arch/arm/lib/copy_from_user.S')
| -rw-r--r-- | arch/arm/lib/copy_from_user.S | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/arch/arm/lib/copy_from_user.S b/arch/arm/lib/copy_from_user.S index a826df3d3814..6709a8d33963 100644 --- a/arch/arm/lib/copy_from_user.S +++ b/arch/arm/lib/copy_from_user.S @@ -93,11 +93,7 @@ ENTRY(arm_copy_from_user) #ifdef CONFIG_CPU_SPECTRE get_thread_info r3 ldr r3, [r3, #TI_ADDR_LIMIT] - adds ip, r1, r2 @ ip=addr+size - sub r3, r3, #1 @ addr_limit - 1 - cmpcc ip, r3 @ if (addr+size > addr_limit - 1) - movcs r1, #0 @ addr = NULL - csdb + uaccess_mask_range_ptr r1, r2, r3, ip #endif #include "copy_template.S" |