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([156.19.246.23]) by smtp.gmail.com with ESMTPSA id it12-20020a056a00458c00b006ead792b6f2sm11960864pfb.1.2024.04.24.15.51.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 24 Apr 2024 15:51:27 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: Michael Tokarev Subject: [PULL 3/9] linux-user: do_setsockopt: make ip_mreq local to the place it is used and inline target_to_host_ip_mreq() Date: Wed, 24 Apr 2024 15:51:17 -0700 Message-Id: <20240424225123.929152-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240424225123.929152-1-richard.henderson@linaro.org> References: <20240424225123.929152-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::434; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x434.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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Michael Tokarev ip_mreq is declared at the beginning of do_setsockopt(), while it is used in only one place. Move its declaration to that very place and replace pointer to alloca()-allocated memory with the structure itself. target_to_host_ip_mreq() is used only once, inline it. This change also properly handles TARGET_EFAULT when the address is wrong. Signed-off-by: Michael Tokarev Message-Id: <20240331100737.2724186-3-mjt@tls.msk.ru> [rth: Fix braces, adjust optlen to match host structure size] Signed-off-by: Richard Henderson --- linux-user/syscall.c | 47 ++++++++++++++++++++++---------------------- 1 file changed, 23 insertions(+), 24 deletions(-) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 59fb3e911f..cca9cafe4f 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -1615,24 +1615,6 @@ static abi_long do_pipe(CPUArchState *cpu_env, abi_ulong pipedes, return get_errno(ret); } -static inline abi_long target_to_host_ip_mreq(struct ip_mreqn *mreqn, - abi_ulong target_addr, - socklen_t len) -{ - struct target_ip_mreqn *target_smreqn; - - target_smreqn = lock_user(VERIFY_READ, target_addr, len, 1); - if (!target_smreqn) - return -TARGET_EFAULT; - mreqn->imr_multiaddr.s_addr = target_smreqn->imr_multiaddr.s_addr; - mreqn->imr_address.s_addr = target_smreqn->imr_address.s_addr; - if (len == sizeof(struct target_ip_mreqn)) - mreqn->imr_ifindex = tswapal(target_smreqn->imr_ifindex); - unlock_user(target_smreqn, target_addr, 0); - - return 0; -} - static inline abi_long target_to_host_sockaddr(int fd, struct sockaddr *addr, abi_ulong target_addr, socklen_t len) @@ -2067,7 +2049,6 @@ static abi_long do_setsockopt(int sockfd, int level, int optname, { abi_long ret; int val; - struct ip_mreqn *ip_mreq; struct ip_mreq_source *ip_mreq_source; switch(level) { @@ -2111,15 +2092,33 @@ static abi_long do_setsockopt(int sockfd, int level, int optname, break; case IP_ADD_MEMBERSHIP: case IP_DROP_MEMBERSHIP: + { + struct ip_mreqn ip_mreq; + struct target_ip_mreqn *target_smreqn; + + QEMU_BUILD_BUG_ON(sizeof(struct ip_mreq) != + sizeof(struct target_ip_mreq)); + if (optlen < sizeof (struct target_ip_mreq) || - optlen > sizeof (struct target_ip_mreqn)) + optlen > sizeof (struct target_ip_mreqn)) { return -TARGET_EINVAL; + } - ip_mreq = (struct ip_mreqn *) alloca(optlen); - target_to_host_ip_mreq(ip_mreq, optval_addr, optlen); - ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq, optlen)); + target_smreqn = lock_user(VERIFY_READ, optval_addr, optlen, 1); + if (!target_smreqn) { + return -TARGET_EFAULT; + } + ip_mreq.imr_multiaddr.s_addr = target_smreqn->imr_multiaddr.s_addr; + ip_mreq.imr_address.s_addr = target_smreqn->imr_address.s_addr; + if (optlen == sizeof(struct target_ip_mreqn)) { + ip_mreq.imr_ifindex = tswapal(target_smreqn->imr_ifindex); + optlen = sizeof(struct ip_mreqn); + } + unlock_user(target_smreqn, optval_addr, 0); + + ret = get_errno(setsockopt(sockfd, level, optname, &ip_mreq, optlen)); break; - + } case IP_BLOCK_SOURCE: case IP_UNBLOCK_SOURCE: case IP_ADD_SOURCE_MEMBERSHIP: -- 2.34.1