[PATCH ARM32 v4.4 V2 36/47] ARM: 8797/1: spectre-v1.1: harden __copy_to_user
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2019-08-01 08:21:12
Also in:
stable
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
From: Julien Thierry <redacted> Commit a1d09e074250fad24f1b993f327b18cc6812eb7a upstream. Sanitize user pointer given to __copy_to_user, both for standard version and memcopy version of the user accessor. Signed-off-by: Julien Thierry <redacted> Signed-off-by: Russell King <redacted> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> --- arch/arm/lib/copy_to_user.S | 6 +++++- arch/arm/lib/uaccess_with_memcpy.c | 3 ++- 2 files changed, 7 insertions(+), 2 deletions(-)
diff --git a/arch/arm/lib/copy_to_user.S b/arch/arm/lib/copy_to_user.S
index caf5019d8161..970abe521197 100644
--- a/arch/arm/lib/copy_to_user.S
+++ b/arch/arm/lib/copy_to_user.S@@ -94,6 +94,11 @@ ENTRY(__copy_to_user_std) WEAK(arm_copy_to_user) +#ifdef CONFIG_CPU_SPECTRE + get_thread_info r3 + ldr r3, [r3, #TI_ADDR_LIMIT] + uaccess_mask_range_ptr r0, r2, r3, ip +#endif #include "copy_template.S"
@@ -108,4 +113,3 @@ ENDPROC(__copy_to_user_std) rsb r0, r0, r2 copy_abort_end .popsection -
diff --git a/arch/arm/lib/uaccess_with_memcpy.c b/arch/arm/lib/uaccess_with_memcpy.c
index 588bbc288396..0b4fe892d00b 100644
--- a/arch/arm/lib/uaccess_with_memcpy.c
+++ b/arch/arm/lib/uaccess_with_memcpy.c@@ -153,7 +153,8 @@ arm_copy_to_user(void __user *to, const void *from, unsigned long n) n = __copy_to_user_std(to, from, n); uaccess_restore(ua_flags); } else { - n = __copy_to_user_memcpy(to, from, n); + n = __copy_to_user_memcpy(uaccess_mask_range_ptr(to, n), + from, n); } return n; }
--
2.21.0.rc0.269.g1a574e7a288b
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