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Peter Anvin" CC: , , , Tong Tiangen Subject: [RFC PATCH -next V2 5/7] arm64: add get_user to machine check safe Date: Wed, 6 Apr 2022 09:13:09 +0000 Message-ID: <20220406091311.3354723-6-tongtiangen@huawei.com> X-Mailer: git-send-email 2.18.0.huawei.25 In-Reply-To: <20220406091311.3354723-1-tongtiangen@huawei.com> References: <20220406091311.3354723-1-tongtiangen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemm600017.china.huawei.com (7.193.23.234) X-CFilter-Loop: Reflected X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: kcia1kbrhrd4k5x4e1xutoxk9kynbzat Authentication-Results: imf17.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=huawei.com; spf=pass (imf17.hostedemail.com: domain of tongtiangen@huawei.com designates 45.249.212.189 as permitted sender) smtp.mailfrom=tongtiangen@huawei.com X-Rspamd-Queue-Id: 241AD4003C X-HE-Tag: 1649235274-950014 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Add scenarios get_user to machine check safe. The processing of EX_TYPE_UACCESS_ERR_ZERO and EX_TYPE_UACCESS_ERR_ZERO_UCE_RECOVERY is same and both return -EFAULT. Signed-off-by: Tong Tiangen --- arch/arm64/include/asm/asm-extable.h | 14 +++++++++++++- arch/arm64/include/asm/uaccess.h | 2 +- arch/arm64/mm/extable.c | 1 + 3 files changed, 15 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/asm-extable.h b/arch/arm64/include/asm/asm-extable.h index 74d1db74fd86..bfc2d224cbae 100644 --- a/arch/arm64/include/asm/asm-extable.h +++ b/arch/arm64/include/asm/asm-extable.h @@ -10,8 +10,11 @@ /* _MC indicates that can fixup from machine check errors */ #define EX_TYPE_FIXUP_MC 5 +#define EX_TYPE_UACCESS_ERR_ZERO_MC 6 -#define IS_EX_TYPE_MC(type) (type == EX_TYPE_FIXUP_MC) +#define IS_EX_TYPE_MC(type) \ + (type == EX_TYPE_FIXUP_MC || \ + type == EX_TYPE_UACCESS_ERR_ZERO_MC) #ifdef __ASSEMBLY__ @@ -77,6 +80,15 @@ #define EX_DATA_REG(reg, gpr) \ "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")" +#define _ASM_EXTABLE_UACCESS_ERR_ZERO_MC(insn, fixup, err, zero) \ + __DEFINE_ASM_GPR_NUMS \ + __ASM_EXTABLE_RAW(#insn, #fixup, \ + __stringify(EX_TYPE_UACCESS_ERR_ZERO_MC), \ + "(" \ + EX_DATA_REG(ERR, err) " | " \ + EX_DATA_REG(ZERO, zero) \ + ")") + #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero) \ __DEFINE_ASM_GPR_NUMS \ __ASM_EXTABLE_RAW(#insn, #fixup, \ diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index e8dce0cc5eaa..24b662407fbd 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -236,7 +236,7 @@ static inline void __user *__uaccess_mask_ptr(const void __user *ptr) asm volatile( \ "1: " load " " reg "1, [%2]\n" \ "2:\n" \ - _ASM_EXTABLE_UACCESS_ERR_ZERO(1b, 2b, %w0, %w1) \ + _ASM_EXTABLE_UACCESS_ERR_ZERO_MC(1b, 2b, %w0, %w1) \ : "+r" (err), "=&r" (x) \ : "r" (addr)) diff --git a/arch/arm64/mm/extable.c b/arch/arm64/mm/extable.c index f1134c88e849..7c05f8d2bce0 100644 --- a/arch/arm64/mm/extable.c +++ b/arch/arm64/mm/extable.c @@ -95,6 +95,7 @@ bool fixup_exception(struct pt_regs *regs, unsigned int esr) case EX_TYPE_BPF: return ex_handler_bpf(ex, regs); case EX_TYPE_UACCESS_ERR_ZERO: + case EX_TYPE_UACCESS_ERR_ZERO_MC: return ex_handler_uaccess_err_zero(ex, regs); case EX_TYPE_LOAD_UNALIGNED_ZEROPAD: return ex_handler_load_unaligned_zeropad(ex, regs);