Date: Sun, 26 Apr 2026 17:57:36 +0000 From: Pouria Mousavizadeh Tehrani <pouria@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Cc: Ricardo Branco <rbranco@suse.de> Subject: git: 4f9f09d95103 - main - compat/linprocfs: Add some entries to /proc/sys/fs and /proc/sys/kernel Message-ID: <69ee5210.1e24a.744ed8ba@gitrepo.freebsd.org>
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The branch main has been updated by pouria: URL: https://cgit.FreeBSD.org/src/commit/?id=4f9f09d95103e1db6b7c75fce7cf3e8c448321e9 commit 4f9f09d95103e1db6b7c75fce7cf3e8c448321e9 Author: Ricardo Branco <rbranco@suse.de> AuthorDate: 2026-04-22 20:19:29 +0000 Commit: Pouria Mousavizadeh Tehrani <pouria@FreeBSD.org> CommitDate: 2026-04-26 17:53:23 +0000 compat/linprocfs: Add some entries to /proc/sys/fs and /proc/sys/kernel Add following sys/fs entries to linprocfs(4): * proc/sys/fs/file-max * proc/sys/fs/file-nr * proc/sys/fs/nr_open * proc/sys/fs/overflowuid * proc/sys/fs/overflowgid * proc/sys/fs/suid_dumpable * proc/sys/fs/protected_hardlinks Also, add /proc/sys/kernel/threads-max Signed-off-by: Ricardo Branco <rbranco@suse.de> PR: 294713 Reviewed by: markj, pouria Pull-Request: https://github.com/freebsd/freebsd-src/pull/2159 --- sys/compat/linprocfs/linprocfs.c | 150 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 150 insertions(+) diff --git a/sys/compat/linprocfs/linprocfs.c b/sys/compat/linprocfs/linprocfs.c index 786a486b9143..a0deea73d19c 100644 --- a/sys/compat/linprocfs/linprocfs.c +++ b/sys/compat/linprocfs/linprocfs.c @@ -1736,6 +1736,23 @@ linprocfs_dotainted(PFS_FILL_ARGS) return (0); } +/* + * Filler function for proc/sys/kernel/threads-max + */ +static int +linprocfs_dothreads_max(PFS_FILL_ARGS) +{ + int res, error; + size_t size = sizeof(res); + + error = kernel_sysctlbyname(curthread, "kern.maxproc", + &res, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + sbuf_printf(sb, "%d\n", res); + return (0); +} + /* * Filler function for proc/sys/vm/min_free_kbytes * @@ -2215,6 +2232,122 @@ linprocfs_dosysvipc_shm(PFS_FILL_ARGS) return (0); } +/* + * Filler function for proc/sys/fs/file-max + */ +static int +linprocfs_dofile_max(PFS_FILL_ARGS) +{ + int res, error; + size_t size = sizeof(res); + + error = kernel_sysctlbyname(curthread, "kern.maxfiles", + &res, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + sbuf_printf(sb, "%d\n", res); + return (0); +} + +/* + * Filler function for proc/sys/fs/file-nr + */ +static int +linprocfs_dofile_nr(PFS_FILL_ARGS) +{ + int openfiles, maxfiles, error; + size_t size; + + size = sizeof(openfiles); + error = kernel_sysctlbyname(curthread, "kern.openfiles", + &openfiles, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + size = sizeof(maxfiles); + error = kernel_sysctlbyname(curthread, "kern.maxfiles", + &maxfiles, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + /* + * From Linux's proc_sys_fs(5): + * the "free file handles" value is always zero. + */ + sbuf_printf(sb, "%d\t0\t%d\n", openfiles, maxfiles); + return (0); +} + +/* + * Filler function for proc/sys/fs/nr_open + */ +static int +linprocfs_donr_open(PFS_FILL_ARGS) +{ + int res, error; + size_t size = sizeof(res); + + error = kernel_sysctlbyname(curthread, "kern.maxfilesperproc", + &res, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + sbuf_printf(sb, "%d\n", res); + return (0); +} + +/* + * Filler function for proc/sys/fs/overflowuid + */ +static int +linprocfs_dooverflowuid(PFS_FILL_ARGS) +{ + sbuf_printf(sb, "%u\n", UID_NOBODY); + return (0); +} + +/* + * Filler function for proc/sys/fs/overflowgid + */ +static int +linprocfs_dooverflowgid(PFS_FILL_ARGS) +{ + sbuf_printf(sb, "%u\n", GID_NOGROUP); + return (0); +} + +/* + * Filler function for proc/sys/fs/suid_dumpable + */ +static int +linprocfs_dosuid_dumpable(PFS_FILL_ARGS) +{ + int res, error; + size_t size = sizeof(res); + + error = kernel_sysctlbyname(curthread, "kern.sugid_coredump", + &res, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + sbuf_printf(sb, "%d\n", res ? 1 : 0); + return (0); +} + +/* + * Filler function for proc/sys/fs/protected_hardlinks + */ +static int +linprocfs_doprotected_hardlinks(PFS_FILL_ARGS) +{ + int res, error; + size_t size = sizeof(res); + + error = kernel_sysctlbyname(curthread, + "security.bsd.hardlink_check_uid", + &res, &size, NULL, 0, 0, 0); + if (error != 0) + return (error); + sbuf_printf(sb, "%d\n", res ? 1 : 0); + return (0); +} + static int linprocfs_doinotify(const char *sysctl, PFS_FILL_ARGS) { @@ -2499,6 +2632,8 @@ linprocfs_init(PFS_INIT_ARGS) NULL, PFS_RD); pfs_create_file(dir, NULL, "tainted", &linprocfs_dotainted, NULL, NULL, NULL, PFS_RD); + pfs_create_file(dir, NULL, "threads-max", &linprocfs_dothreads_max, + NULL, NULL, NULL, PFS_RD); /* /proc/sys/kernel/random/... */ pfs_create_dir(dir, &dir, "random", NULL, NULL, NULL, 0); @@ -2526,6 +2661,21 @@ linprocfs_init(PFS_INIT_ARGS) /* /proc/sys/fs/... */ pfs_create_dir(sys, &fs, "fs", NULL, NULL, NULL, 0); + pfs_create_file(fs, NULL, "file-nr", &linprocfs_dofile_nr, + NULL, NULL, NULL, PFS_RD); + pfs_create_file(fs, NULL, "file-max", &linprocfs_dofile_max, + NULL, NULL, NULL, PFS_RD); + pfs_create_file(fs, NULL, "nr_open", &linprocfs_donr_open, + NULL, NULL, NULL, PFS_RD); + pfs_create_file(fs, NULL, "overflowgid", &linprocfs_dooverflowgid, + NULL, NULL, NULL, PFS_RD); + pfs_create_file(fs, NULL, "overflowuid", &linprocfs_dooverflowuid, + NULL, NULL, NULL, PFS_RD); + pfs_create_file(fs, NULL, "protected_hardlinks", + &linprocfs_doprotected_hardlinks, NULL, NULL, NULL, PFS_RD); + pfs_create_file(fs, NULL, "suid_dumpable", &linprocfs_dosuid_dumpable, + NULL, NULL, NULL, PFS_RD); + pfs_create_dir(fs, &dir, "inotify", NULL, NULL, NULL, 0); pfs_create_file(dir, NULL, "max_queued_events", &linprocfs_doinotify_max_queued_events, NULL, NULL, NULL, PFS_RDWR);home | help
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