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Thu, 05 Feb 2026 09:27:02 -0800 (PST) From: Warner Losh Date: Thu, 05 Feb 2026 10:26:53 -0700 Subject: [PATCH 20/24] bsd-user: Add message queue implementations MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260205-bsd-user-claude-v1-20-8d8ff0035372@bsdimp.com> References: <20260205-bsd-user-claude-v1-0-8d8ff0035372@bsdimp.com> In-Reply-To: <20260205-bsd-user-claude-v1-0-8d8ff0035372@bsdimp.com> To: qemu-devel@nongnu.org Cc: =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Kyle Evans , =?utf-8?q?Marc-Andr=C3=A9_Lureau?= , Paolo Bonzini , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Riku Voipio , Warner Losh , Stacey Son X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=3541; i=imp@bsdimp.com; h=from:subject:message-id; bh=nKXAa3T6zR4KAOQoocdZ+gW738kupf2pGtZbZmUp+zA=; b=owEBbQKS/ZANAwAKAWwc0Sh9sBEAAcsmYgBphNLbHX7n2j4sNO1HoAgiaVQm+IU42z1o6Yog2 oTzurjGlGGJAjMEAAEKAB0WIQQgNfiUsAqjz3zN4bdsHNEofbARAAUCaYTS2wAKCRBsHNEofbAR AEakEACpxCF4V4rybn3HhlI1QuUzfjidxKtswVKNYhs7COkAe9KT6eoxYgLgZEO9Ex1IDULSnDw gNI+Nw/SpPsD41R+39Go6CitXtIV99eyWGBOdHa9TJau5M5hRSmZ6L/CWufD+ZSGaL94tgFkuRO kMZlb4ze6+cebacboE11/SPINZgXeosauh6hq9wpzDeV0xY3Y97PuXC0uGf4UdGsgXYAT/NCuO7 JC51+jVZMUy75R2xzBjaXjfmlVfYBroFwf4AXJMJMM7mqt3f0zxNsPW32f4qk0V8HreH+pCAyLs Jts12pCzD5D3/yw5DCyT5P909pHOMP/efWUcfjMC1BEuR03UPdMOfNnYIMcvK98AcUwAWxLsaz/ 6+hDyBAi6sOzBRRsmgWZaWPvu+5abshPBbdB2ONkJdMl11YbE92k99bwX6J8ZHBp7yPl4Y1s1mY 7yYqk6GgbBXQyxRtRJ+UDDWspdgmxJ9ZrTHUOdHKR3s2n8t/XqqXrwQwsz334Mn8K+K+RX7ifJY fCRqojKp9mPaJjMBVnJTRiN3c7NTR8l3DE1q/A0Mhi82n+A/FUhaBxtnB9y8USdw4gmWrMX9SHj eIkR7yk5oaGTZHEf3ibI6WJ558l2MrGpMuFtABGSGdD+bfmTMpBS6p+I2AjnPBEe6aFqjUATfcu Fx5X1su11aR6uOQ== X-Developer-Key: i=imp@bsdimp.com; a=openpgp; fpr=2035F894B00AA3CF7CCDE1B76C1CD1287DB01100 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::22d; envelope-from=imp@bsdimp.com; helo=mail-oi1-x22d.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: qemu development 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.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1770312587038158500 From: Stacey Son Add implementations for: - msgsnd(2): Send message to queue with size validation - msgget(2): Get message queue identifier - msgrcv(2): Receive message from queue with size validation Includes bsd_validate_msgsz() helper that caches kern.ipc.msgmax to validates message sizes. Signed-off-by: Stacey Son Signed-off-by: Warner Losh Reviewed-by: Richard Henderson --- bsd-user/bsd-misc.h | 95 +++++++++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 95 insertions(+) diff --git a/bsd-user/bsd-misc.h b/bsd-user/bsd-misc.h index 27f4497d76..0025c97f78 100644 --- a/bsd-user/bsd-misc.h +++ b/bsd-user/bsd-misc.h @@ -281,6 +281,101 @@ static inline abi_long do_bsd_msgctl(int msgid, int t= arget_cmd, abi_long ptr) return ret; } =20 +struct kern_mymsg { + long mtype; + char mtext[1]; +}; + +static inline abi_long bsd_validate_msgsz(abi_ulong msgsz) +{ + /* Fetch msgmax the first time we need it. */ + if (bsd_msgmax =3D=3D 0) { + size_t len =3D sizeof(bsd_msgmax); + + if (sysctlbyname("kern.ipc.msgmax", &bsd_msgmax, &len, NULL, 0) = =3D=3D -1) { + return -TARGET_EINVAL; + } + } + + if (msgsz > bsd_msgmax) { + return -TARGET_EINVAL; + } + return 0; +} + +/* msgsnd(2) */ +static inline abi_long do_bsd_msgsnd(int msqid, abi_long msgp, + abi_ulong msgsz, int msgflg) +{ + struct target_msgbuf *target_mb; + struct kern_mymsg *host_mb; + abi_long ret; + + ret =3D bsd_validate_msgsz(msgsz); + if (is_error(ret)) { + return ret; + } + if (!lock_user_struct(VERIFY_READ, target_mb, msgp, 0)) { + return -TARGET_EFAULT; + } + host_mb =3D g_malloc(msgsz + sizeof(long)); + host_mb->mtype =3D (abi_long) tswapal(target_mb->mtype); + memcpy(host_mb->mtext, target_mb->mtext, msgsz); + ret =3D get_errno(msgsnd(msqid, host_mb, msgsz, msgflg)); + g_free(host_mb); + unlock_user_struct(target_mb, msgp, 0); + + return ret; +} + +/* msgget(2) */ +static inline abi_long do_bsd_msgget(abi_long key, abi_long msgflag) +{ + abi_long ret; + + ret =3D get_errno(msgget(key, msgflag)); + return ret; +} + +/* msgrcv(2) */ +static inline abi_long do_bsd_msgrcv(int msqid, abi_long msgp, + abi_ulong msgsz, abi_long msgtyp, int msgflg) +{ + struct target_msgbuf *target_mb =3D NULL; + char *target_mtext; + struct kern_mymsg *host_mb; + abi_long ret =3D 0; + + ret =3D bsd_validate_msgsz(msgsz); + if (is_error(ret)) { + return ret; + } + if (!lock_user_struct(VERIFY_WRITE, target_mb, msgp, 0)) { + return -TARGET_EFAULT; + } + host_mb =3D g_malloc(msgsz + sizeof(long)); + ret =3D get_errno(msgrcv(msqid, host_mb, msgsz, tswapal(msgtyp), msgfl= g)); + if (ret > 0) { + abi_ulong target_mtext_addr =3D msgp + sizeof(abi_ulong); + target_mtext =3D lock_user(VERIFY_WRITE, target_mtext_addr, ret, 0= ); + if (target_mtext =3D=3D NULL) { + ret =3D -TARGET_EFAULT; + goto end; + } + memcpy(target_mb->mtext, host_mb->mtext, ret); + unlock_user(target_mtext, target_mtext_addr, ret); + } + if (!is_error(ret)) { + target_mb->mtype =3D tswapal(host_mb->mtype); + } +end: + if (target_mb !=3D NULL) { + unlock_user_struct(target_mb, msgp, 1); + } + g_free(host_mb); + return ret; +} + /* getdtablesize(2) */ static inline abi_long do_bsd_getdtablesize(void) { --=20 2.52.0