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[187.189.51.144]) by smtp.gmail.com with ESMTPSA id g74sm13495472qke.3.2021.03.15.13.40.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Mar 2021 13:40:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0HNRdXOLI0iSRy67gqzQq2Zt89PPHYP+0Szsh23enG4=; b=DIeWgFsEJOr6LZp4zgWd5DQfb4Z9wDWilcBdKeBEx/IFJSajP+ZmIJvrnlFEBGsQGM mGk/fqBtMW5yh/wGbcE+K6BENA1JuL7wjjyhyrvGF4CZT7yxS9XlhrAQym32DXIc7Z6h BxNKw7001ycG27rvPP/gshAZNkixjogdbOZFukf18mg0qoKXgU1lWHWMfNgPOTzFl6Tw RvygGEXdIBHHY4pbZ43ZVdGRTodnFeACu6PcR8mvcvNij1bv7r54CANq5aVdgUupwfo0 NHlO2Y8U2qDL1ulAu5EK5NSfibJDBe712ZyNrevLvy63cfOF7OMY77IKfwX6jDQVVzRX DR9w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=0HNRdXOLI0iSRy67gqzQq2Zt89PPHYP+0Szsh23enG4=; b=BFSIlnnuN1GnTcy+eXAZbqoLPkIZ5u/ZNSwgCtKs6ln91aONzF0G5jVG74ELQXlgXh 05CraO061mUFC0S/m6UPTfKeE90Nxs3/ipSOEsr7yqQuuHkHgp3mljgAU9PJwSbFDy+V 7JmRJhI/4lzLOyYwbgGEvHhGjSapHki+t3xbTRkDBdg0w4XRqbRK2vVihFao/yNyCK1y wpJ4JfGRUFQAIlMChyzaymQk/rOpJqlisG0bhVfPdWfLuAwRlSKQ/AEfCqQiPWCUZ901 p9Vv5xYfcaH1s8BF83XxN+DwsphvFcAl+OnTjbwhfOAgyc4784H+yMirhdaOThUALOF0 hkUw== X-Gm-Message-State: AOAM532hEFtnzFof+kV2mMRQxVJYUi2iweVonGvPbnB76QUNVZ9Hdk0f 8w7XvsEx5JSbvLku+choTFCSZLjzkNmYUUaP X-Google-Smtp-Source: ABdhPJxAIJV4CAcgq3vRx/PEIGWlr0i1dOyeRT4BYhKEln2OwSOozAm3JHrU6sdIg1ZeqIjNf1n1ig== X-Received: by 2002:a37:44e:: with SMTP id 75mr26398851qke.150.1615840806336; Mon, 15 Mar 2021 13:40:06 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH] linux-user: Use signed lengths in uaccess.c Date: Mon, 15 Mar 2021 14:40:04 -0600 Message-Id: <20210315204004.2025219-1-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::729; envelope-from=richard.henderson@linaro.org; helo=mail-qk1-x729.google.com 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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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: peter.maydell@linaro.org, laurent@vivier.eu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) Content-Type: text/plain; charset="utf-8" Partially revert 09f679b62dff, but only for the length arguments. Instead of reverting to long, use ssize_t. Reinstate the > 0 check in unlock_user. Fixes: 09f679b62dff Reported-by: Coverity (CID 1446711) Signed-off-by: Richard Henderson Reviewed-by: Laurent Vivier --- linux-user/qemu.h | 15 +++++++++------ linux-user/uaccess.c | 12 ++++++------ 2 files changed, 15 insertions(+), 12 deletions(-) diff --git a/linux-user/qemu.h b/linux-user/qemu.h index 52c981710b..74e06e7121 100644 --- a/linux-user/qemu.h +++ b/linux-user/qemu.h @@ -627,8 +627,8 @@ static inline bool access_ok(CPUState *cpu, int type, * buffers between the target and host. These internally perform * locking/unlocking of the memory. */ -int copy_from_user(void *hptr, abi_ulong gaddr, size_t len); -int copy_to_user(abi_ulong gaddr, void *hptr, size_t len); +int copy_from_user(void *hptr, abi_ulong gaddr, ssize_t len); +int copy_to_user(abi_ulong gaddr, void *hptr, ssize_t len); =20 /* Functions for accessing guest memory. The tget and tput functions read/write single values, byteswapping as necessary. The lock_user fun= ction @@ -638,16 +638,19 @@ int copy_to_user(abi_ulong gaddr, void *hptr, size_t = len); =20 /* Lock an area of guest memory into the host. If copy is true then the host area will have the same contents as the guest. */ -void *lock_user(int type, abi_ulong guest_addr, size_t len, bool copy); +void *lock_user(int type, abi_ulong guest_addr, ssize_t len, bool copy); =20 /* Unlock an area of guest memory. The first LEN bytes must be flushed back to guest memory. host_ptr =3D NULL is explicitly allowed and does nothing. */ #ifndef DEBUG_REMAP -static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, size_= t len) -{ } +static inline void unlock_user(void *host_ptr, abi_ulong guest_addr, + ssize_t len) +{ + /* no-op */ +} #else -void unlock_user(void *host_ptr, abi_ulong guest_addr, long len); +void unlock_user(void *host_ptr, abi_ulong guest_addr, ssize_t len); #endif =20 /* Return the length of a string in target memory or -TARGET_EFAULT if diff --git a/linux-user/uaccess.c b/linux-user/uaccess.c index c696913016..82b833b8f1 100644 --- a/linux-user/uaccess.c +++ b/linux-user/uaccess.c @@ -4,7 +4,7 @@ =20 #include "qemu.h" =20 -void *lock_user(int type, abi_ulong guest_addr, size_t len, bool copy) +void *lock_user(int type, abi_ulong guest_addr, ssize_t len, bool copy) { void *host_addr; =20 @@ -24,7 +24,7 @@ void *lock_user(int type, abi_ulong guest_addr, size_t le= n, bool copy) } =20 #ifdef DEBUG_REMAP -void unlock_user(void *host_ptr, abi_ulong guest_addr, size_t len); +void unlock_user(void *host_ptr, abi_ulong guest_addr, ssize_t len); { void *host_ptr_conv; =20 @@ -35,7 +35,7 @@ void unlock_user(void *host_ptr, abi_ulong guest_addr, si= ze_t len); if (host_ptr =3D=3D host_ptr_conv) { return; } - if (len !=3D 0) { + if (len > 0) { memcpy(host_ptr_conv, host_ptr, len); } g_free(host_ptr); @@ -48,14 +48,14 @@ void *lock_user_string(abi_ulong guest_addr) if (len < 0) { return NULL; } - return lock_user(VERIFY_READ, guest_addr, (size_t)len + 1, 1); + return lock_user(VERIFY_READ, guest_addr, len + 1, 1); } =20 /* copy_from_user() and copy_to_user() are usually used to copy data * buffers between the target and host. These internally perform * locking/unlocking of the memory. */ -int copy_from_user(void *hptr, abi_ulong gaddr, size_t len) +int copy_from_user(void *hptr, abi_ulong gaddr, ssize_t len) { int ret =3D 0; void *ghptr =3D lock_user(VERIFY_READ, gaddr, len, 1); @@ -69,7 +69,7 @@ int copy_from_user(void *hptr, abi_ulong gaddr, size_t le= n) return ret; } =20 -int copy_to_user(abi_ulong gaddr, void *hptr, size_t len) +int copy_to_user(abi_ulong gaddr, void *hptr, ssize_t len) { int ret =3D 0; void *ghptr =3D lock_user(VERIFY_WRITE, gaddr, len, 0); --=20 2.25.1