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| author | Julien Thierry <[email protected]> | 2018-09-11 09:14:50 +0000 |
|---|---|---|
| committer | Russell King <[email protected]> | 2018-10-05 09:51:15 +0000 |
| commit | afaf6838f4bc896a711180b702b388b8cfa638fc (patch) | |
| tree | 1971dfe3cd88aba8e98339d928f17a9dd87cf285 /arch/arm/include/asm/assembler.h | |
| parent | ARM: 8795/1: spectre-v1.1: use put_user() for __put_user() (diff) | |
| download | kernel-afaf6838f4bc896a711180b702b388b8cfa638fc.tar.gz kernel-afaf6838f4bc896a711180b702b388b8cfa638fc.zip | |
ARM: 8796/1: spectre-v1,v1.1: provide helpers for address sanitization
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 <[email protected]>
Signed-off-by: Russell King <[email protected]>
Diffstat (limited to 'arch/arm/include/asm/assembler.h')
| -rw-r--r-- | arch/arm/include/asm/assembler.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index f0515f60cff5..39651c1ec157 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -467,6 +467,17 @@ THUMB( orr \reg , \reg , #PSR_T_BIT ) #endif .endm + .macro uaccess_mask_range_ptr, addr:req, size:req, limit:req, tmp:req +#ifdef CONFIG_CPU_SPECTRE + sub \tmp, \limit, #1 + subs \tmp, \tmp, \addr @ tmp = limit - 1 - addr + addhs \tmp, \tmp, #1 @ if (tmp >= 0) { + subhss \tmp, \tmp, \size @ tmp = limit - (addr + size) } + movlo \addr, #0 @ if (tmp < 0) addr = NULL + csdb +#endif + .endm + .macro uaccess_disable, tmp, isb=1 #ifdef CONFIG_CPU_SW_DOMAIN_PAN /* |