From owner-svn-src-head@freebsd.org Thu May 23 12:35:41 2019 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 5066815A931C; Thu, 23 May 2019 12:35:41 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id E2F156AA71; Thu, 23 May 2019 12:35:40 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id B07B650DB; Thu, 23 May 2019 12:35:40 +0000 (UTC) (envelope-from kib@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id x4NCZesi079159; Thu, 23 May 2019 12:35:40 GMT (envelope-from kib@FreeBSD.org) Received: (from kib@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id x4NCZegC079158; Thu, 23 May 2019 12:35:40 GMT (envelope-from kib@FreeBSD.org) Message-Id: <201905231235.x4NCZegC079158@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: kib set sender to kib@FreeBSD.org using -f From: Konstantin Belousov Date: Thu, 23 May 2019 12:35:40 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r348158 - head/sys/kern X-SVN-Group: head X-SVN-Commit-Author: kib X-SVN-Commit-Paths: head/sys/kern X-SVN-Commit-Revision: 348158 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: E2F156AA71 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org X-Spamd-Result: default: False [-2.96 / 15.00]; local_wl_from(0.00)[FreeBSD.org]; NEURAL_HAM_MEDIUM(-1.00)[-0.995,0]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; NEURAL_HAM_SHORT(-0.97)[-0.969,0]; ASN(0.00)[asn:11403, ipnet:2610:1c1:1::/48, country:US] X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 23 May 2019 12:35:41 -0000 Author: kib Date: Thu May 23 12:35:40 2019 New Revision: 348158 URL: https://svnweb.freebsd.org/changeset/base/348158 Log: Add a kern.ipc.posix_shm_list sysctl. The sysctl provides the listing on named linked posix shared memory segments existing in the system. Reuse shm_fill_kinfo() for filling individual struct kinfo_file. Remove unneeded lock around reading of shmfd->shm_mode. Reviewed by: jilles, tmunro Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D20258 Modified: head/sys/kern/uipc_shm.c Modified: head/sys/kern/uipc_shm.c ============================================================================== --- head/sys/kern/uipc_shm.c Thu May 23 12:27:45 2019 (r348157) +++ head/sys/kern/uipc_shm.c Thu May 23 12:35:40 2019 (r348158) @@ -76,6 +76,7 @@ __FBSDID("$FreeBSD$"); #include #include #include +#include #include #include #include @@ -1101,34 +1102,89 @@ shm_unmap(struct file *fp, void *mem, size_t size) } static int -shm_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp) +shm_fill_kinfo_locked(struct shmfd *shmfd, struct kinfo_file *kif, bool list) { const char *path, *pr_path; - struct shmfd *shmfd; size_t pr_pathlen; + bool visible; + sx_assert(&shm_dict_lock, SA_LOCKED); kif->kf_type = KF_TYPE_SHM; - shmfd = fp->f_data; - - mtx_lock(&shm_timestamp_lock); - kif->kf_un.kf_file.kf_file_mode = S_IFREG | shmfd->shm_mode; /* XXX */ - mtx_unlock(&shm_timestamp_lock); + kif->kf_un.kf_file.kf_file_mode = S_IFREG | shmfd->shm_mode; kif->kf_un.kf_file.kf_file_size = shmfd->shm_size; if (shmfd->shm_path != NULL) { - sx_slock(&shm_dict_lock); if (shmfd->shm_path != NULL) { path = shmfd->shm_path; pr_path = curthread->td_ucred->cr_prison->pr_path; if (strcmp(pr_path, "/") != 0) { /* Return the jail-rooted pathname. */ pr_pathlen = strlen(pr_path); - if (strncmp(path, pr_path, pr_pathlen) == 0 && - path[pr_pathlen] == '/') + visible = strncmp(path, pr_path, pr_pathlen) + == 0 && path[pr_pathlen] == '/'; + if (list && !visible) + return (EPERM); + if (visible) path += pr_pathlen; } strlcpy(kif->kf_path, path, sizeof(kif->kf_path)); } - sx_sunlock(&shm_dict_lock); } return (0); } + +static int +shm_fill_kinfo(struct file *fp, struct kinfo_file *kif, + struct filedesc *fdp __unused) +{ + int res; + + sx_slock(&shm_dict_lock); + res = shm_fill_kinfo_locked(fp->f_data, kif, false); + sx_sunlock(&shm_dict_lock); + return (res); +} + +static int +sysctl_posix_shm_list(SYSCTL_HANDLER_ARGS) +{ + struct shm_mapping *shmm; + struct sbuf sb; + struct kinfo_file kif; + u_long i; + ssize_t curlen; + int error, error2; + + sbuf_new_for_sysctl(&sb, NULL, sizeof(struct kinfo_file) * 5, req); + sbuf_clear_flags(&sb, SBUF_INCLUDENUL); + curlen = 0; + error = 0; + sx_slock(&shm_dict_lock); + for (i = 0; i < shm_hash + 1; i++) { + LIST_FOREACH(shmm, &shm_dictionary[i], sm_link) { + error = shm_fill_kinfo_locked(shmm->sm_shmfd, + &kif, true); + if (error == EPERM) + continue; + if (error != 0) + break; + pack_kinfo(&kif); + if (req->oldptr != NULL && + kif.kf_structsize + curlen > req->oldlen) + break; + error = sbuf_bcat(&sb, &kif, kif.kf_structsize) == 0 ? + 0 : ENOMEM; + if (error != 0) + break; + curlen += kif.kf_structsize; + } + } + sx_sunlock(&shm_dict_lock); + error2 = sbuf_finish(&sb); + sbuf_delete(&sb); + return (error != 0 ? error : error2); +} + +SYSCTL_PROC(_kern_ipc, OID_AUTO, posix_shm_list, + CTLFLAG_RD | CTLFLAG_MPSAFE | CTLTYPE_OPAQUE, + NULL, 0, sysctl_posix_shm_list, "", + "POSIX SHM list");