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Mon, 25 May 2020 13:19:09 +0000 (UTC) From: Thomas Huth To: qemu-devel@nongnu.org Subject: [PATCH 7/7] linux-user: limit check to HOST_LONG_BITS < TARGET_ABI_BITS Date: Mon, 25 May 2020 15:18:23 +0200 Message-Id: <20200525131823.715-8-thuth@redhat.com> In-Reply-To: <20200525131823.715-1-thuth@redhat.com> References: <20200525131823.715-1-thuth@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=207.211.31.81; envelope-from=thuth@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/25 06:55:03 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Wainer dos Santos Moschetta , Cleber Rosa Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Alex Bennée Newer clangs rightly spot that you can never exceed the full address space of 64 bit hosts with: linux-user/elfload.c:2076:41: error: result of comparison 'unsigned long' > 18446744073709551615 is always false [-Werror,-Wtautological-type-limit-compare] 4685 if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) { 4686 ~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~ 4687 1 error generated. So lets limit the check to 32 bit hosts only. Fixes: ee94743034bf Reported-by: Thomas Huth Signed-off-by: Alex Bennée [thuth: Use HOST_LONG_BITS < TARGET_ABI_BITS instead of HOST_LONG_BITS == 32] Signed-off-by: Thomas Huth --- linux-user/elfload.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 01a9323a63..ebc663ea0b 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -2073,12 +2073,14 @@ static void pgb_have_guest_base(const char *image_name, abi_ulong guest_loaddr, exit(EXIT_FAILURE); } } else { +#if HOST_LONG_BITS < TARGET_ABI_BITS if ((guest_hiaddr - guest_base) > ~(uintptr_t)0) { error_report("%s: requires more virtual address space " "than the host can provide (0x%" PRIx64 ")", image_name, (uint64_t)guest_hiaddr - guest_base); exit(EXIT_FAILURE); } +#endif } /* -- 2.18.1