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[71.237.47.177]) by smtp.gmail.com with ESMTPSA id r17-20020a028811000000b003af4300d670sm4500923jai.27.2023.02.13.16.28.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 13 Feb 2023 16:28:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20210112.gappssmtp.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=dwPHE1FXflVhMkzlH4zIuKp10+3mi6EDvmobdXFkcL8=; b=MZmZMX/bhHIxgNojzAjOAFViaG7RPva/b4DhO3XUpuLq405B8qyiARThlQZGjp7D/Z c2QIlfoT0DTILwJL9I4dRAdokWHkgbiDD+njjgeFl0G10SlHEixTS00wMBf4FKcb6Km5 8fDy38siV9dLWLLJ/ag/bd07etgjRlrSobWZCtZqv02JMsmYQxTAyPbzfmPesEXmQszK Uy5wxGqJG5Supw/1ynANGBTle0aepCjjBVkIzZ3S/k4MA5BnRGvh83KWyfrIiobVHb5/ VGe04F9GHX0fi3tUOzUaRaNReRW5OTygMCYJMGbTuVSmacKT/2M23aRcEq5wZwoiqVPt dbzQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=dwPHE1FXflVhMkzlH4zIuKp10+3mi6EDvmobdXFkcL8=; b=L5My+l6xfDRySl/v1DNtd17ekihC1idZc1MX1iGsoqJBhsfhq/gjV5HuNIW8kUR+lr qsCHUwstJXqx2uAE1GHJMCHH2J1BQFeVyQeiAAw51jLUt0vxbLrCP6uBJfKTk0x/y1Cu 8zDbJ7lkzqEmmiN+/OEqViVJsn64RvEqZ8QvpBWuy01MIVieSrHC4RIIo++oCS20mGVq b9BaqOIiltAJQfjJliMjXSOjq5KkjlO4mxf8EDZdIunGZJhTYqDyzRIXmOfUWbkXy4Oc rCMrSvErm4D3tNlHDnQGKS+kfljMc2ZpOAHdfwX/2YzjEsqYCAU+UJooOBYoBUKyFb6D v0AA== X-Gm-Message-State: AO0yUKUQU81vOUM6b4X4438J/0c+c1S48EVvcEVe36XbsD7gE+xMtAxS G7EKnFdQNQf7A/+9VqvbMi75AwdLXOMqg6vq X-Google-Smtp-Source: AK7set+28Hn/7XQevFVLps3N6+KJPLSnqJeifeXaxXEaa8RweQxClAJvGfHROc6RsIE5Ex7ZyJRS7g== X-Received: by 2002:a05:6e02:2147:b0:30f:36c4:8c6b with SMTP id d7-20020a056e02214700b0030f36c48c6bmr762918ilv.6.1676334492369; Mon, 13 Feb 2023 16:28:12 -0800 (PST) From: Warner Losh To: qemu-devel@nongnu.org Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , Warner Losh , richard.henderson@linaro.org, Paolo Bonzini , kevans@freebsd.org, f4bug@amsat.org, Thomas Huth , Kyle Evans Subject: [PATCH v2 11/12] bsd-user: implement sysctlbyname(2) Date: Mon, 13 Feb 2023 17:27:56 -0700 Message-Id: <20230214002757.99240-12-imp@bsdimp.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230214002757.99240-1-imp@bsdimp.com> References: <20230214002757.99240-1-imp@bsdimp.com> 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: none client-ip=2607:f8b0:4864:20::133; envelope-from=imp@bsdimp.com; helo=mail-il1-x133.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @bsdimp-com.20210112.gappssmtp.com) X-ZM-MESSAGEID: 1676334557033100007 Content-Type: text/plain; charset="utf-8" From: Kyle Evans do_freebsd_sysctlbyname needs to translate the 'name' back down to a OID so we can intercept the special ones. Do that and call the common wrapper do_freebsd_sysctl_oid. Signed-off-by: Kyle Evans Reviewed-by: Warner Losh Signed-off-by: Warner Losh Reviewed-by: Richard Henderson --- bsd-user/freebsd/os-sys.c | 67 +++++++++++++++++++++++++++++++++++ bsd-user/freebsd/os-syscall.c | 4 +++ bsd-user/qemu.h | 3 ++ 3 files changed, 74 insertions(+) diff --git a/bsd-user/freebsd/os-sys.c b/bsd-user/freebsd/os-sys.c index e70f8f21c52..33720ddbb38 100644 --- a/bsd-user/freebsd/os-sys.c +++ b/bsd-user/freebsd/os-sys.c @@ -481,6 +481,73 @@ out: return ret; } =20 +/* + * This syscall was created to make sysctlbyname(3) more efficient, but we= can't + * really provide it in bsd-user. Notably, we must always translate the n= ames + * independently since some sysctl values have to be faked for the target + * environment, so it still has to break down to two syscalls for the unde= rlying + * implementation. + */ +abi_long do_freebsd_sysctlbyname(CPUArchState *env, abi_ulong namep, + int32_t namelen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, + abi_ulong newlen) +{ + abi_long ret =3D -TARGET_EFAULT; + void *holdp =3D NULL, *hnewp =3D NULL; + char *snamep =3D NULL; + int oid[CTL_MAXNAME + 2]; + size_t holdlen, oidplen; + abi_ulong oldlen =3D 0; + + /* oldlenp is read/write, pre-check here for write */ + if (oldlenp) { + if (!access_ok(VERIFY_WRITE, oldlenp, sizeof(abi_ulong)) || + get_user_ual(oldlen, oldlenp)) { + goto out; + } + } + snamep =3D lock_user_string(namep); + if (snamep =3D=3D NULL) { + goto out; + } + if (newp) { + hnewp =3D lock_user(VERIFY_READ, newp, newlen, 1); + if (hnewp =3D=3D NULL) { + goto out; + } + } + if (oldp) { + holdp =3D lock_user(VERIFY_WRITE, oldp, oldlen, 0); + if (holdp =3D=3D NULL) { + goto out; + } + } + holdlen =3D oldlen; + + oidplen =3D sizeof(oid) / sizeof(int); + if (sysctlnametomib(snamep, oid, &oidplen) !=3D 0) { + ret =3D -TARGET_EINVAL; + goto out; + } + + ret =3D do_freebsd_sysctl_oid(env, oid, oidplen, holdp, &holdlen, hnew= p, + newlen); + + /* + * writeability pre-checked above. __sysctl(2) returns ENOMEM and upda= tes + * oldlenp for the proper size to use. + */ + if (oldlenp && (ret =3D=3D 0 || ret =3D=3D -TARGET_ENOMEM)) { + put_user_ual(holdlen, oldlenp); + } +out: + unlock_user(snamep, namep, 0); + unlock_user(holdp, oldp, ret =3D=3D 0 ? holdlen : 0); + unlock_user(hnewp, newp, 0); + + return ret; +} + abi_long do_freebsd_sysctl(CPUArchState *env, abi_ulong namep, int32_t nam= elen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, abi_ulong newle= n) { diff --git a/bsd-user/freebsd/os-syscall.c b/bsd-user/freebsd/os-syscall.c index 20ab3d4d9a1..179a20c304b 100644 --- a/bsd-user/freebsd/os-syscall.c +++ b/bsd-user/freebsd/os-syscall.c @@ -498,6 +498,10 @@ static abi_long freebsd_syscall(void *cpu_env, int num= , abi_long arg1, ret =3D do_freebsd_sysctl(cpu_env, arg1, arg2, arg3, arg4, arg5, a= rg6); break; =20 + case TARGET_FREEBSD_NR___sysctlbyname: /* sysctlbyname(2) */ + ret =3D do_freebsd_sysctlbyname(cpu_env, arg1, arg2, arg3, arg4, a= rg5, arg6); + break; + case TARGET_FREEBSD_NR_sysarch: /* sysarch(2) */ ret =3D do_freebsd_sysarch(cpu_env, arg1, arg2); break; diff --git a/bsd-user/qemu.h b/bsd-user/qemu.h index c7248cfde6f..e24a8cfcfb1 100644 --- a/bsd-user/qemu.h +++ b/bsd-user/qemu.h @@ -254,6 +254,9 @@ int host_to_target_errno(int err); /* os-sys.c */ abi_long do_freebsd_sysctl(CPUArchState *env, abi_ulong namep, int32_t nam= elen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, abi_ulong newle= n); +abi_long do_freebsd_sysctlbyname(CPUArchState *env, abi_ulong namep, + int32_t namelen, abi_ulong oldp, abi_ulong oldlenp, abi_ulong newp, + abi_ulong newlen); abi_long do_freebsd_sysarch(void *cpu_env, abi_long arg1, abi_long arg2); =20 /* user access */ --=20 2.39.1