From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:48018) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fGTJ8-0004g8-NA for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fGTJ7-0005Rv-Et for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:18 -0400 Received: from mail-pg0-x241.google.com ([2607:f8b0:400e:c05::241]:46105) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fGTJ7-0005Q7-9b for qemu-devel@nongnu.org; Wed, 09 May 2018 13:55:17 -0400 Received: by mail-pg0-x241.google.com with SMTP id z4-v6so22986552pgu.13 for ; Wed, 09 May 2018 10:55:17 -0700 (PDT) From: Richard Henderson Date: Wed, 9 May 2018 10:54:39 -0700 Message-Id: <20180509175458.15642-10-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 09/28] target/s390x: 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 Reviewed-by: Thomas Huth Reviewed-by: David Hildenbrand Acked-by: Cornelia Huck Cc: Cornelia Huck Cc: Alexander Graf Cc: David Hildenbrand Cc: qemu-s390x@nongnu.org Signed-off-by: Emilio G. Cota Signed-off-by: Richard Henderson --- target/s390x/translate.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/target/s390x/translate.c b/target/s390x/translate.c index 7d39ab350d..44449f11ab 100644 --- a/target/s390x/translate.c +++ b/target/s390x/translate.c @@ -6163,7 +6163,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) CPUS390XState *env = cs->env_ptr; DisasContext dc; target_ulong pc_start; - uint64_t next_page_start; + uint64_t page_start; int num_insns, max_insns; ExitStatus status; bool do_debug; @@ -6181,7 +6181,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) dc.ex_value = tb->cs_base; do_debug = dc.singlestep_enabled = cs->singlestep_enabled; - 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; @@ -6218,7 +6218,7 @@ void gen_intermediate_code(CPUState *cs, struct TranslationBlock *tb) /* If we reach a page boundary, are single stepping, or exhaust instruction count, stop generation. */ if (status == NO_EXIT - && (dc.pc >= next_page_start + && (dc.pc - page_start >= TARGET_PAGE_SIZE || tcg_op_buf_full() || num_insns >= max_insns || singlestep -- 2.17.0