From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48002) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fGTJ8-0004fS-G6 for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fGTJ4-0005LU-3R for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:18 -0400 Received: from mail-pg0-x242.google.com ([2607:f8b0:400e:c05::242]:41945) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fGTJ3-0005Jt-Qi for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:13 -0400 Received: by mail-pg0-x242.google.com with SMTP id m21-v6so23010213pgv.8 for ; Wed, 09 May 2018 10:55:13 -0700 (PDT) From: Richard Henderson Date: Wed, 9 May 2018 10:54:37 -0700 Message-Id: <20180509175458.15642-8-richard.henderson@linaro.org> In-Reply-To: <20180509175458.15642-1-richard.henderson@linaro.org> References: <20180509175458.15642-1-richard.henderson@linaro.org> Subject: [Qemu-devel] [PULL 07/28] target/microblaze: avoid integer overflow in next_page PC check List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: David Hildenbrand , Alexander Graf , Stafford Horne , Cornelia Huck , Bastian Koppelmann , "Edgar E. Iglesias" , Paolo Bonzini , Michael Walle , Max Filippov , Richard Henderson , Michael Clark , Eduardo Habkost , Sagar Karandikar , peter.maydell@linaro.org, Aurelien Jarno , Yongbok Kim , qemu-s390x@nongnu.org, Artyom Tarasenko , Palmer Dabbelt , David Gibson , qemu-ppc@nongnu.org, qemu-arm@nongnu.org, Mark Cave-Ayland , Guan Xuetao , Peter Crosthwaite , "Emilio G. Cota" From: "Emilio G. Cota" If the PC is in the last page of the address space, next_page_start overflows to 0. Fix it. Reviewed-by: Richard Henderson Cc: "Edgar E. Iglesias" Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- target/microblaze/translate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/target/microblaze/translate.c b/target/microblaze/translate.c index 100883e2cc..0872dc9ded 100644 --- a/target/microblaze/translate.c +++ b/target/microblaze/translate.c @@ -1635,7 +1635,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) uint32_t pc_start; struct DisasContext ctx; struct DisasContext *dc = &ctx; - uint32_t next_page_start, org_flags; + uint32_t page_start, org_flags; target_ulong npc; int num_insns; int max_insns; @@ -1661,7 +1661,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) cpu_abort(cs, "Microblaze: unaligned PC=%x\n", pc_start); } - next_page_start = (pc_start & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE; + page_start = pc_start & TARGET_PAGE_MASK; num_insns = 0; max_insns = tb_cflags(tb) & CF_COUNT_MASK; if (max_insns == 0) { @@ -1747,7 +1747,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) } while (!dc->is_jmp && !dc->cpustate_changed && !tcg_op_buf_full() && !singlestep - && (dc->pc < next_page_start) + && (dc->pc - page_start < TARGET_PAGE_SIZE) && num_insns < max_insns); npc = dc->pc; -- 2.17.0