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powerpc/uaccess: Enable hardened usercopy

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Enables CONFIG_HARDENED_USERCOPY checks on powerpc.

Based on code from PaX and grsecurity.

Signed-off-by: Kees Cook <keescook@chromium.org>
Tested-by: Michael Ellerman <mpe@ellerman.id.au>
(cherry picked from commit 1d3c1324746fed0e34a5b94d3ed303e7521ed603)
Signed-off-by: Alex Shi <alex.shi@linaro.org>
This commit is contained in:
Kees Cook 2016-06-23 15:10:01 -07:00 • committed by Alex Shi
parent 434bef236c
commit 225237bf68
2 changed files with 20 additions and 2 deletions
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1
arch/powerpc/Kconfig
View file

@ -160,6 +160,7 @@ config PPC
select EDAC_ATOMIC_SCRUB
select ARCH_HAS_DMA_SET_COHERENT_MASK
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_HARDENED_USERCOPY
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN

21
arch/powerpc/include/asm/uaccess.h
View file

@ -325,10 +325,15 @@ static inline unsigned long copy_from_user(void *to,
{
unsigned long over;
if (access_ok(VERIFY_READ, from, n))
if (access_ok(VERIFY_READ, from, n)) {
if (!__builtin_constant_p(n))
check_object_size(to, n, false);
return __copy_tofrom_user((__force void __user *)to, from, n);
}
if ((unsigned long)from < TASK_SIZE) {
over = (unsigned long)from + n - TASK_SIZE;
if (!__builtin_constant_p(n - over))
check_object_size(to, n - over, false);
return __copy_tofrom_user((__force void __user *)to, from,
n - over) + over;
}
@ -340,10 +345,15 @@ static inline unsigned long copy_to_user(void __user *to,
{
unsigned long over;
if (access_ok(VERIFY_WRITE, to, n))
if (access_ok(VERIFY_WRITE, to, n)) {
if (!__builtin_constant_p(n))
check_object_size(from, n, true);
return __copy_tofrom_user(to, (__force void __user *)from, n);
}
if ((unsigned long)to < TASK_SIZE) {
over = (unsigned long)to + n - TASK_SIZE;
if (!__builtin_constant_p(n))
check_object_size(from, n - over, true);
return __copy_tofrom_user(to, (__force void __user *)from,
n - over) + over;
}
@ -387,6 +397,10 @@ static inline unsigned long __copy_from_user_inatomic(void *to,
if (ret == 0)
return 0;
}
if (!__builtin_constant_p(n))
check_object_size(to, n, false);
return __copy_tofrom_user((__force void __user *)to, from, n);
}
@ -413,6 +427,9 @@ static inline unsigned long __copy_to_user_inatomic(void __user *to,
if (ret == 0)
return 0;
}
if (!__builtin_constant_p(n))
check_object_size(from, n, true);
return __copy_tofrom_user(to, (__force const void __user *)from, n);
}