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From: Elena Petrova To: kvmarm@lists.cs.columbia.edu Cc: George Popescu , Elena Petrova , Marc Zyngier , open list , linux-arm-kernel@lists.infradead.org, George Popescu X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu From: George Popescu Whenever an arithmetic overflow: addition, substraction, multiplication, division or negating happens inside the hyp/nVHE code, an __ubsan_handle_*_overflow is called. All the overflow handlers are sharing the same structure called overflow_data. Signed-off-by: George Popescu Signed-off-by: Elena Petrova --- arch/arm64/include/asm/kvm_ubsan.h | 10 ++++++-- arch/arm64/kvm/hyp/nvhe/ubsan.c | 40 ++++++++++++++++++++++++++---- arch/arm64/kvm/kvm_ubsan_buffer.c | 20 ++++++++++++++- 3 files changed, 62 insertions(+), 8 deletions(-) diff --git a/arch/arm64/include/asm/kvm_ubsan.h b/arch/arm64/include/asm/kvm_ubsan.h index 93c1b695097a..da4a3b4e28e0 100644 --- a/arch/arm64/include/asm/kvm_ubsan.h +++ b/arch/arm64/include/asm/kvm_ubsan.h @@ -22,7 +22,8 @@ struct kvm_ubsan_info { UBSAN_UNREACHABLE_DATA, UBSAN_SHIFT_OUT_OF_BOUNDS, UBSAN_INVALID_DATA, - UBSAN_TYPE_MISMATCH + UBSAN_TYPE_MISMATCH, + UBSAN_OVERFLOW_DATA } type; union { struct out_of_bounds_data out_of_bounds_data; @@ -30,6 +31,7 @@ struct kvm_ubsan_info { struct shift_out_of_bounds_data shift_out_of_bounds_data; struct invalid_value_data invalid_value_data; struct type_mismatch_data type_mismatch_data; + struct overflow_data overflow_data; }; union { struct ubsan_values u_val; @@ -41,4 +43,8 @@ void __ubsan_handle_builtin_unreachable(void *_data); void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs); void __ubsan_handle_load_invalid_value(void *_data, void *val); void __ubsan_handle_type_mismatch(struct type_mismatch_data *_data, void *ptr); - +void __ubsan_handle_add_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_sub_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_mul_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_negate_overflow(void *_data, void *old_val); +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs); diff --git a/arch/arm64/kvm/hyp/nvhe/ubsan.c b/arch/arm64/kvm/hyp/nvhe/ubsan.c index a9f72d4bcab7..f16842ff7316 100644 --- a/arch/arm64/kvm/hyp/nvhe/ubsan.c +++ b/arch/arm64/kvm/hyp/nvhe/ubsan.c @@ -47,15 +47,45 @@ static void write_type_mismatch_data(struct type_mismatch_data_common *data, voi } } -void __ubsan_handle_add_overflow(void *_data, void *lhs, void *rhs) {} +static void write_overflow_data(struct overflow_data *data, void *lval, void *rval, char op) +{ + struct kvm_ubsan_info *slot = kvm_ubsan_buffer_next_slot(); + + if (slot) { + slot->type = UBSAN_OVERFLOW_DATA; + slot->overflow_data = *data; + slot->u_val.op = op; + slot->u_val.lval = lval; + if (op != '!') + slot->u_val.rval = rval; + } +} + +void __ubsan_handle_add_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '+'); +} -void __ubsan_handle_sub_overflow(void *_data, void *lhs, void *rhs) {} +void __ubsan_handle_sub_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '-'); +} -void __ubsan_handle_mul_overflow(void *_data, void *lhs, void *rhs) {} +void __ubsan_handle_mul_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '*'); +} -void __ubsan_handle_negate_overflow(void *_data, void *old_val) {} +void __ubsan_handle_negate_overflow(void *_data, void *old_val) +{ + write_overflow_data(_data, old_val, NULL, '!'); +} + +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '/'); +} -void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs) {} void __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr) { diff --git a/arch/arm64/kvm/kvm_ubsan_buffer.c b/arch/arm64/kvm/kvm_ubsan_buffer.c index b7823dedf8b1..2c7060cbb48b 100644 --- a/arch/arm64/kvm/kvm_ubsan_buffer.c +++ b/arch/arm64/kvm/kvm_ubsan_buffer.c @@ -39,7 +39,25 @@ void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot) __ubsan_handle_type_mismatch(&slot->type_mismatch_data, slot->u_val.lval); break; - } + case UBSAN_OVERFLOW_DATA: + if (slot->u_val.op == '/') { + __ubsan_handle_divrem_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '!') { + __ubsan_handle_negate_overflow(&slot->overflow_data, + slot->u_val.lval); + } else if (slot->u_val.op == '+') { + __ubsan_handle_add_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '-') { + __ubsan_handle_sub_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '*') { + __ubsan_handle_mul_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } + break; + } } void iterate_kvm_ubsan_buffer(unsigned long left, unsigned long right) -- 2.30.0.296.g2bfb1c46d8-goog _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_ADSP_CUSTOM_MED,DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF28DC433E0 for ; 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Fri, 15 Jan 2021 09:19:13 -0800 (PST) Date: Fri, 15 Jan 2021 17:18:29 +0000 In-Reply-To: <20210115171830.3602110-1-lenaptr@google.com> Message-Id: <20210115171830.3602110-9-lenaptr@google.com> Mime-Version: 1.0 References: <20210115171830.3602110-1-lenaptr@google.com> X-Mailer: git-send-email 2.30.0.296.g2bfb1c46d8-goog Subject: [PATCH v3 8/9] KVM: arm64: Detect arithmetic overflow is inside hyp/nVHE. From: Elena Petrova To: kvmarm@lists.cs.columbia.edu X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210115_121918_558381_41820073 X-CRM114-Status: GOOD ( 14.34 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: George Popescu , Elena Petrova , Suzuki K Poulose , Marc Zyngier , open list , James Morse , linux-arm-kernel@lists.infradead.org, George Popescu , Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: George Popescu Whenever an arithmetic overflow: addition, substraction, multiplication, division or negating happens inside the hyp/nVHE code, an __ubsan_handle_*_overflow is called. All the overflow handlers are sharing the same structure called overflow_data. Signed-off-by: George Popescu Signed-off-by: Elena Petrova --- arch/arm64/include/asm/kvm_ubsan.h | 10 ++++++-- arch/arm64/kvm/hyp/nvhe/ubsan.c | 40 ++++++++++++++++++++++++++---- arch/arm64/kvm/kvm_ubsan_buffer.c | 20 ++++++++++++++- 3 files changed, 62 insertions(+), 8 deletions(-) diff --git a/arch/arm64/include/asm/kvm_ubsan.h b/arch/arm64/include/asm/kvm_ubsan.h index 93c1b695097a..da4a3b4e28e0 100644 --- a/arch/arm64/include/asm/kvm_ubsan.h +++ b/arch/arm64/include/asm/kvm_ubsan.h @@ -22,7 +22,8 @@ struct kvm_ubsan_info { UBSAN_UNREACHABLE_DATA, UBSAN_SHIFT_OUT_OF_BOUNDS, UBSAN_INVALID_DATA, - UBSAN_TYPE_MISMATCH + UBSAN_TYPE_MISMATCH, + UBSAN_OVERFLOW_DATA } type; union { struct out_of_bounds_data out_of_bounds_data; @@ -30,6 +31,7 @@ struct kvm_ubsan_info { struct shift_out_of_bounds_data shift_out_of_bounds_data; struct invalid_value_data invalid_value_data; struct type_mismatch_data type_mismatch_data; + struct overflow_data overflow_data; }; union { struct ubsan_values u_val; @@ -41,4 +43,8 @@ void __ubsan_handle_builtin_unreachable(void *_data); void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs); void __ubsan_handle_load_invalid_value(void *_data, void *val); void __ubsan_handle_type_mismatch(struct type_mismatch_data *_data, void *ptr); - +void __ubsan_handle_add_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_sub_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_mul_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_negate_overflow(void *_data, void *old_val); +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs); diff --git a/arch/arm64/kvm/hyp/nvhe/ubsan.c b/arch/arm64/kvm/hyp/nvhe/ubsan.c index a9f72d4bcab7..f16842ff7316 100644 --- a/arch/arm64/kvm/hyp/nvhe/ubsan.c +++ b/arch/arm64/kvm/hyp/nvhe/ubsan.c @@ -47,15 +47,45 @@ static void write_type_mismatch_data(struct type_mismatch_data_common *data, voi } } -void __ubsan_handle_add_overflow(void *_data, void *lhs, void *rhs) {} +static void write_overflow_data(struct overflow_data *data, void *lval, void *rval, char op) +{ + struct kvm_ubsan_info *slot = kvm_ubsan_buffer_next_slot(); + + if (slot) { + slot->type = UBSAN_OVERFLOW_DATA; + slot->overflow_data = *data; + slot->u_val.op = op; + slot->u_val.lval = lval; + if (op != '!') + slot->u_val.rval = rval; + } +} + +void __ubsan_handle_add_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '+'); +} -void __ubsan_handle_sub_overflow(void *_data, void *lhs, void *rhs) {} +void __ubsan_handle_sub_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '-'); +} -void __ubsan_handle_mul_overflow(void *_data, void *lhs, void *rhs) {} +void __ubsan_handle_mul_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '*'); +} -void __ubsan_handle_negate_overflow(void *_data, void *old_val) {} +void __ubsan_handle_negate_overflow(void *_data, void *old_val) +{ + write_overflow_data(_data, old_val, NULL, '!'); +} + +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '/'); +} -void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs) {} void __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr) { diff --git a/arch/arm64/kvm/kvm_ubsan_buffer.c b/arch/arm64/kvm/kvm_ubsan_buffer.c index b7823dedf8b1..2c7060cbb48b 100644 --- a/arch/arm64/kvm/kvm_ubsan_buffer.c +++ b/arch/arm64/kvm/kvm_ubsan_buffer.c @@ -39,7 +39,25 @@ void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot) __ubsan_handle_type_mismatch(&slot->type_mismatch_data, slot->u_val.lval); break; - } + case UBSAN_OVERFLOW_DATA: + if (slot->u_val.op == '/') { + __ubsan_handle_divrem_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '!') { + __ubsan_handle_negate_overflow(&slot->overflow_data, + slot->u_val.lval); + } else if (slot->u_val.op == '+') { + __ubsan_handle_add_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '-') { + __ubsan_handle_sub_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '*') { + __ubsan_handle_mul_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } + break; + } } void iterate_kvm_ubsan_buffer(unsigned long left, unsigned long right) -- 2.30.0.296.g2bfb1c46d8-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-26.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E5839C433DB for ; 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Fri, 15 Jan 2021 09:19:13 -0800 (PST) Date: Fri, 15 Jan 2021 17:18:29 +0000 In-Reply-To: <20210115171830.3602110-1-lenaptr@google.com> Message-Id: <20210115171830.3602110-9-lenaptr@google.com> Mime-Version: 1.0 References: <20210115171830.3602110-1-lenaptr@google.com> X-Mailer: git-send-email 2.30.0.296.g2bfb1c46d8-goog Subject: [PATCH v3 8/9] KVM: arm64: Detect arithmetic overflow is inside hyp/nVHE. From: Elena Petrova To: kvmarm@lists.cs.columbia.edu Cc: Elena Petrova , linux-arm-kernel@lists.infradead.org, open list , Marc Zyngier , James Morse , Julien Thierry , Suzuki K Poulose , George Popescu , George Popescu Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: George Popescu Whenever an arithmetic overflow: addition, substraction, multiplication, division or negating happens inside the hyp/nVHE code, an __ubsan_handle_*_overflow is called. All the overflow handlers are sharing the same structure called overflow_data. Signed-off-by: George Popescu Signed-off-by: Elena Petrova --- arch/arm64/include/asm/kvm_ubsan.h | 10 ++++++-- arch/arm64/kvm/hyp/nvhe/ubsan.c | 40 ++++++++++++++++++++++++++---- arch/arm64/kvm/kvm_ubsan_buffer.c | 20 ++++++++++++++- 3 files changed, 62 insertions(+), 8 deletions(-) diff --git a/arch/arm64/include/asm/kvm_ubsan.h b/arch/arm64/include/asm/kvm_ubsan.h index 93c1b695097a..da4a3b4e28e0 100644 --- a/arch/arm64/include/asm/kvm_ubsan.h +++ b/arch/arm64/include/asm/kvm_ubsan.h @@ -22,7 +22,8 @@ struct kvm_ubsan_info { UBSAN_UNREACHABLE_DATA, UBSAN_SHIFT_OUT_OF_BOUNDS, UBSAN_INVALID_DATA, - UBSAN_TYPE_MISMATCH + UBSAN_TYPE_MISMATCH, + UBSAN_OVERFLOW_DATA } type; union { struct out_of_bounds_data out_of_bounds_data; @@ -30,6 +31,7 @@ struct kvm_ubsan_info { struct shift_out_of_bounds_data shift_out_of_bounds_data; struct invalid_value_data invalid_value_data; struct type_mismatch_data type_mismatch_data; + struct overflow_data overflow_data; }; union { struct ubsan_values u_val; @@ -41,4 +43,8 @@ void __ubsan_handle_builtin_unreachable(void *_data); void __ubsan_handle_shift_out_of_bounds(void *_data, void *lhs, void *rhs); void __ubsan_handle_load_invalid_value(void *_data, void *val); void __ubsan_handle_type_mismatch(struct type_mismatch_data *_data, void *ptr); - +void __ubsan_handle_add_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_sub_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_mul_overflow(void *data, void *lhs, void *rhs); +void __ubsan_handle_negate_overflow(void *_data, void *old_val); +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs); diff --git a/arch/arm64/kvm/hyp/nvhe/ubsan.c b/arch/arm64/kvm/hyp/nvhe/ubsan.c index a9f72d4bcab7..f16842ff7316 100644 --- a/arch/arm64/kvm/hyp/nvhe/ubsan.c +++ b/arch/arm64/kvm/hyp/nvhe/ubsan.c @@ -47,15 +47,45 @@ static void write_type_mismatch_data(struct type_mismatch_data_common *data, voi } } -void __ubsan_handle_add_overflow(void *_data, void *lhs, void *rhs) {} +static void write_overflow_data(struct overflow_data *data, void *lval, void *rval, char op) +{ + struct kvm_ubsan_info *slot = kvm_ubsan_buffer_next_slot(); + + if (slot) { + slot->type = UBSAN_OVERFLOW_DATA; + slot->overflow_data = *data; + slot->u_val.op = op; + slot->u_val.lval = lval; + if (op != '!') + slot->u_val.rval = rval; + } +} + +void __ubsan_handle_add_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '+'); +} -void __ubsan_handle_sub_overflow(void *_data, void *lhs, void *rhs) {} +void __ubsan_handle_sub_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '-'); +} -void __ubsan_handle_mul_overflow(void *_data, void *lhs, void *rhs) {} +void __ubsan_handle_mul_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '*'); +} -void __ubsan_handle_negate_overflow(void *_data, void *old_val) {} +void __ubsan_handle_negate_overflow(void *_data, void *old_val) +{ + write_overflow_data(_data, old_val, NULL, '!'); +} + +void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs) +{ + write_overflow_data(_data, lhs, rhs, '/'); +} -void __ubsan_handle_divrem_overflow(void *_data, void *lhs, void *rhs) {} void __ubsan_handle_type_mismatch(struct type_mismatch_data *data, void *ptr) { diff --git a/arch/arm64/kvm/kvm_ubsan_buffer.c b/arch/arm64/kvm/kvm_ubsan_buffer.c index b7823dedf8b1..2c7060cbb48b 100644 --- a/arch/arm64/kvm/kvm_ubsan_buffer.c +++ b/arch/arm64/kvm/kvm_ubsan_buffer.c @@ -39,7 +39,25 @@ void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot) __ubsan_handle_type_mismatch(&slot->type_mismatch_data, slot->u_val.lval); break; - } + case UBSAN_OVERFLOW_DATA: + if (slot->u_val.op == '/') { + __ubsan_handle_divrem_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '!') { + __ubsan_handle_negate_overflow(&slot->overflow_data, + slot->u_val.lval); + } else if (slot->u_val.op == '+') { + __ubsan_handle_add_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '-') { + __ubsan_handle_sub_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } else if (slot->u_val.op == '*') { + __ubsan_handle_mul_overflow(&slot->overflow_data, + slot->u_val.lval, slot->u_val.rval); + } + break; + } } void iterate_kvm_ubsan_buffer(unsigned long left, unsigned long right) -- 2.30.0.296.g2bfb1c46d8-goog