xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arm64: uaccess: Mask __user pointers for __arch_{clear, copy_*}_user

Browse Source 
Like we've done for get_user and put_user, ensure that user pointers
are masked before invoking the underlying __arch_{clear,copy_*}_user
operations.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Will Deacon
2018-02-05 15:34:23 +00:00
committed by Catalin Marinas
parent 84624087dd
commit f71c2ffcb2
4 changed files with 30 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
arch/arm64/lib/clear_user.S
View File

@@ -21,7 +21,7 @@
.text
/* Prototype: int __clear_user(void *addr, size_t sz)
/* Prototype: int __arch_clear_user(void *addr, size_t sz)
* Purpose : clear some user memory
* Params : addr - user memory address to clear
* : sz - number of bytes to clear
@@ -29,7 +29,7 @@
*
* Alignment fixed up by hardware.
*/
ENTRY(__clear_user)
ENTRY(__arch_clear_user)
uaccess_enable_not_uao x2, x3, x4
mov x2, x1 // save the size for fixup return
subs x1, x1, #8
@@ -52,7 +52,7 @@ uao_user_alternative 9f, strb, sttrb, wzr, x0, 0
5: mov x0, #0
uaccess_disable_not_uao x2, x3
ret
ENDPROC(__clear_user)
ENDPROC(__arch_clear_user)
.section .fixup,"ax"
.align 2