net/samba420: fix fdescfs handling which causes several issues

Issue from bug 284623: several PANIC errors in log.smbd, similar to:

  [2025/02/02 16:56:09.823293,	0] ../../lib/util/fault.c:193(smb_panic_log)
    PANIC (pid 8625): async open timeout in 4.20.7
  [2025/02/02 16:56:09.827129,	0] ../../lib/util/fault.c:304(log_stack_trace)
    BACKTRACE: 20 stack frames:
     #0 0x3645750f6ec7 <log_stack_trace+0x37> at /usr/local/lib/samba4/private/libgenrand-private-samba.so
     #1 0x3645750f6f9e <smb_panic+0xe> at /usr/local/lib/samba4/private/libgenrand-private-samba.so
     #2 0x36456b707b24 <smbd_exit_server+0x1b4> at /usr/local/lib/samba4/private/libsmbd-base-private-samba.so
     #3 0x36456b707981 <smbd_exit_server+0x11> at /usr/local/lib/samba4/private/libsmbd-base-private-samba.so
     #4 0x364575394bcc <exit_server+0x1c> at /usr/local/lib/samba4/private/libsmbd-shim-private-samba.so
     #5 0x36456b6b2b10 <delete_all_streams> at /usr/local/lib/samba4/private/libsmbd-base-private-samba.so
     #6 0x364575935dff <tevent_common_invoke_timer_handler+0x18f> at /usr/local/lib/libtevent.so.0
     #7 0x364575935fa4 <tevent_common_loop_timer_delay+0x94> at /usr/local/lib/libtevent.so.0
     #8 0x3645759337c5 <tevent_context_same_loop+0xb15> at /usr/local/lib/libtevent.so.0
     #9 0x36457592f36a <_tevent_loop_once+0xea> at /usr/local/lib/libtevent.so.0
     #10 0x36457592f5f2 <tevent_common_loop_wait+0x32> at /usr/local/lib/libtevent.so.0
     #11 0x36456b6cd34b <smbd_process+0x83b> at /usr/local/lib/samba4/private/libsmbd-base-private-samba.so
     #12 0x363d4788f9bd <main+0x42fd> at /usr/local/sbin/smbd
     #13 0x36457593067e <tevent_common_invoke_fd_handler+0x9e> at /usr/local/lib/libtevent.so.0
     #14 0x364575933a44 <tevent_context_same_loop+0xd94> at /usr/local/lib/libtevent.so.0
     #15 0x36457592f36a <_tevent_loop_once+0xea> at /usr/local/lib/libtevent.so.0
     #16 0x36457592f5f2 <tevent_common_loop_wait+0x32> at /usr/local/lib/libtevent.so.0
     #17 0x363d4788df3f <main+0x287f> at /usr/local/sbin/smbd
     #18 0x363d4788cbac <main+0x14ec> at /usr/local/sbin/smbd
     #19 0x36457742ac3a <__libc_start1+0x12a> at /lib/libc.so.7

Issue from bug 286821: accessing Samba shares from macOS clients results
in error dialogs titled: "There was a problem connecting to the server",
with content "The share does not exist on the server. Please check the
share name and then try again".

The problems are caused by fdescfs handling:
* patch 0028-s3-lib-system-add-FreeBSD-proc_fd_pattern.patch was how
  Timur solved the fd problem for Samba 4.19 (mounting fdescfs nodup
  under /var/run/samba4/fd);
* if only this had been accepted upstream, we would not have had this
  problem in 4.20... :(
* in any case this code is now unused in 4.20, where Samba went even
  more Linux-only;
* patch 0101-FreeBSD-add-fdescfs-paths-workaround.patch was a naive
  tentative to solve the same problem for 4.20, apparently without
  taking into account what had been done before; it's broken by design,
  brokenly implementated and it simply doesn't work.

Apply a patch by Andrea Venturoli <ml@netfence.it>, which drops the 0101
patch, and modifies the older 0028 patch to revive what Timur had done.

PR:		284623, 286821
Tested by:	O. Hartmann <ohartmann@walstatt.org> and others
Approved by:	samba (0mp)
MFH:		2025Q3

3 files changed, 57 insertions, 129 deletions

diff --git a/net/samba420/Makefile b/net/samba420/Makefile
index 6d6c72c1f552..3696bb72befa 100644
--- a/net/samba420/Makefile
+++ b/net/samba420/Makefile
@@ -1,6 +1,6 @@
 PORTNAME=			${SAMBA4_BASENAME}420
 PORTVERSION=			${SAMBA4_VERSION}
-PORTREVISION=			9
+PORTREVISION=			10
 CATEGORIES?=			net
 MASTER_SITES=			SAMBA/samba/stable SAMBA/samba/rc
 DISTNAME=			${SAMBA4_DISTNAME}
@@ -47,7 +47,6 @@ EXTRA_PATCHES=			\
 				${PATCHDIR}/0028-Fix-rl_completion_func_t.patch:-p1 \
 				${PATCHDIR}/0028-s3-lib-system-add-FreeBSD-proc_fd_pattern.patch \
 				${PATCHDIR}/0100-Fix-pathref-handling-for-FreeBSD-13plus_samba42x.patch:-p1 \
-				${PATCHDIR}/0101-FreeBSD-add-fdescfs-paths-workaround.patch:-p1 \
 				${PATCHDIR}/0102-FreeBSD-vfs_freebsd-fix-sys_proc_fd_path-args.patch:-p1
 
 SAMBA4_BASENAME=		samba
diff --git a/net/samba420/files/0028-s3-lib-system-add-FreeBSD-proc_fd_pattern.patch b/net/samba420/files/0028-s3-lib-system-add-FreeBSD-proc_fd_pattern.patch
index cda9c7ed1c95..2721be912c76 100644
--- a/net/samba420/files/0028-s3-lib-system-add-FreeBSD-proc_fd_pattern.patch
+++ b/net/samba420/files/0028-s3-lib-system-add-FreeBSD-proc_fd_pattern.patch
@@ -1,14 +1,24 @@
---- source3/lib/system.c.orig	2024-02-02 10:33:51.188489400 +0100
-+++ source3/lib/system.c	2025-01-22 17:39:58.625028000 +0100
-@@ -1047,22 +1047,108 @@
+From 584c69e77abb537a7345222648a397a9963c01b7 Mon Sep 17 00:00:00 2001
+From: "Timur I. Bakeyev" <timur@FreeBSD.org>
+Date: Sat, 15 Oct 2022 04:02:43 +0200
+Subject: [PATCH 28/28] s3:lib:system - add FreeBSD proc_fd_pattern
+
+Add support for FreeBSD equivalent of /proc/self/fd through a special
+fdescfs mount with option "nodup". This filesystem should be mounted
+either to the private $PIDDIR/fd/ directory or to /dev/fd in order to
+provide security and performance characteristics similar to Linux.
+
+Signed-off-by: Timur I. Bakeyev <timur@FreeBSD.org>
+Adapted for Samba 4.20 by: Andrea venturoli <ml@netfence.it>
+---
+--- source3/lib/system.c.orig	2025-06-27 15:05:05 UTC
++++ source3/lib/system.c
+@@ -1047,6 +1047,68 @@ int sys_get_number_of_cores(void)
  }
  #endif
  
--bool sys_have_proc_fds(void)
 +static bool freebsd_fdesc_check(const char *pattern)
- {
--	static bool checked = false;
--	static bool have_proc_fds = false;
++{
 +	char fdesc_path[PATH_MAX];
 +	int fd, fd2;
 +
@@ -49,26 +59,6 @@
 +	return true;
 +}
 +
-+static char* linux_pattern(char *buf, size_t bufsize)
-+{
-+	char proc_fd_path[PATH_MAX];
-+	const char *pattern = "/proc/self/fd/%lu";
- 	struct stat sb;
--	int ret;
- 
--	if (checked) {
--		return have_proc_fds;
-+	snprintf(proc_fd_path, sizeof(proc_fd_path), pattern, 0);
-+	if(stat(proc_fd_path, &sb) == 0) {
-+		snprintf(buf, bufsize, "%s", pattern);
-+		return buf;
- 	}
-+	return NULL;
-+}
- 
--	ret = stat("/proc/self/fd/0", &sb);
--	have_proc_fds = (ret == 0);
--	checked = true;
 +static char* freebsd_pattern(char *buf, size_t bufsize) {
 +	const char** base;
 +	const char* base_dir[] = {
@@ -76,8 +66,7 @@
 +		"/dev",
 +		NULL
 +	};
- 
--	return have_proc_fds;
++
 +	for(base = &base_dir[0]; *base != NULL; base++) {
 +		snprintf(buf, bufsize, "%s/fd/%%lu", *base);
 +		if(freebsd_fdesc_check(buf)) {
@@ -87,35 +76,46 @@
 +	return NULL;
 +}
 +
-+static char* (*proc_fd_patterns[])(char *, size_t) = {
-+	linux_pattern,
-+	freebsd_pattern,
-+	NULL
-+};
-+ 
 +static char proc_fd_pattern_buf[PATH_MAX];
 +static const char *proc_fd_pattern = NULL;
-+ 
-+bool sys_have_proc_fds(void)
-+{
-+	static bool checked = false;
-+	static bool have_proc_fds = false;
-+	char* (**pattern_func)(char *, size_t) = NULL;
-+ 
-+ 	if (checked) {
-+ 		return have_proc_fds;
-+ 	}
-+ 
-+	for (pattern_func = &proc_fd_patterns[0]; *pattern_func != NULL; pattern_func++) {
-+		if((*pattern_func)(proc_fd_pattern_buf, sizeof(proc_fd_pattern_buf)) != NULL) {
-+			have_proc_fds = true;
-+			proc_fd_pattern = proc_fd_pattern_buf;
-+			break;
-+ 		}
-+ 	}
 +
-+ 	checked = true;
-+ 	return have_proc_fds;
- }
+ bool sys_have_proc_fds(void)
+ {
+ 	static bool checked = false;
+@@ -1058,8 +1078,12 @@ bool sys_have_proc_fds(void)
+ 		return have_proc_fds;
+ 	}
+ 
+-	ret = stat("/proc/self/fd/0", &sb);
+-	have_proc_fds = (ret == 0);
++	if (freebsd_pattern(proc_fd_pattern_buf, sizeof(proc_fd_pattern_buf)) != NULL) {
++                have_proc_fds = true;
++		proc_fd_pattern = proc_fd_pattern_buf;
++	} else
++                have_proc_fds = false;
++
+ 	checked = true;
+ 
+ 	return have_proc_fds;
+@@ -1067,10 +1091,18 @@ char *sys_proc_fd_path(int fd, struct sys_proc_fd_path
  
  char *sys_proc_fd_path(int fd, struct sys_proc_fd_path_buf *buf)
+ {
++	 bool have_proc_fds = sys_have_proc_fds();
++        SMB_ASSERT(have_proc_fds);
++#if defined(__clang__)
++#pragma clang diagnostic push
++#pragma clang diagnostic ignored "-Wformat-nonliteral"
++#endif
+ 	int written =
+-		snprintf(buf->buf, sizeof(buf->buf), "/proc/self/fd/%d", fd);
+-
+-	SMB_ASSERT(sys_have_proc_fds() && (written >= 0));
++		snprintf(buf->buf, sizeof(buf->buf), proc_fd_pattern, fd);
++#if defined(__clang__)
++#pragma clang diagnostic pop
++#endif
++	SMB_ASSERT(written >= 0);
+ 
+ 	return buf->buf;
+ }
diff --git a/net/samba420/files/0101-FreeBSD-add-fdescfs-paths-workaround.patch b/net/samba420/files/0101-FreeBSD-add-fdescfs-paths-workaround.patch
deleted file mode 100644
index 714ad6ae52ef..000000000000
--- a/net/samba420/files/0101-FreeBSD-add-fdescfs-paths-workaround.patch
+++ /dev/null
@@ -1,71 +0,0 @@
-# 2024-08-05
-# NOTE: Upstream Samba commit 9f63fad392f3 removed the static array defining Linux and FreeBSD
-#	fdescfs paths and hardcoded a Linux-specific /proc path, with the note that if any
-#	others need to be added, they can be done so via #ifdef's.  This patch attempts to
-#	do that, but in a way that minimizes the necessary #ifdefs by defining a simplistic
-#	#define macro to generate the appropriate path for fdescfs based on the running OS.
-#
-# See: https://git.samba.org/?p=samba.git;a=commitdiff;h=9f63fad392f3cff34d6a8e318e0427499170c417
-
-diff -Naurp a/lib/fuzzing/fuzz_regfio.c b/lib/fuzzing/fuzz_regfio.c
---- a/lib/fuzzing/fuzz_regfio.c	2024-02-02 04:33:50.952488000 -0500
-+++ b/lib/fuzzing/fuzz_regfio.c	2024-08-05 20:41:16.624793000 -0400
-@@ -31,7 +31,7 @@ int LLVMFuzzerInitialize(int *argc, char ***argv)
- {
- 	fp = tmpfile();
- 
--	(void)snprintf(filename, sizeof(filename), "/proc/self/fd/%d", fileno(fp));
-+	(void)snprintf(filename, sizeof(filename), PROC_FD_PATH_MKSTR(%d), fileno(fp));
- 
- 	return 0;
- }
-diff -Naurp a/lib/replace/closefrom.c b/lib/replace/closefrom.c
---- a/lib/replace/closefrom.c	2024-02-02 04:33:50.984488200 -0500
-+++ b/lib/replace/closefrom.c	2024-08-05 20:41:16.625141000 -0400
-@@ -53,7 +53,7 @@ static int closefrom_procfs(int lower)
- 	size_t i;
- 	int ret = ENOMEM;
- 
--	dirp = opendir("/proc/self/fd");
-+	dirp = opendir(PROC_FD_PATH_MKSTR());
- 	if (dirp == NULL) {
- 		return errno;
- 	}
-diff -Naurp a/source3/include/proto.h b/source3/include/proto.h
---- a/source3/include/proto.h	2024-08-05 20:40:38.434560000 -0400
-+++ b/source3/include/proto.h	2024-08-05 20:41:26.063626000 -0400
-@@ -205,8 +205,21 @@ int sys_get_number_of_cores(void);
- int sys_get_number_of_cores(void);
- #endif
- 
-+#ifdef __FreeBSD__
-+#define PROC_FD_PATH_STR	"/compat/linux/dev/fd/"
-+#define PROC_FD_PATH_SZ		42
-+#else /* Linux */
-+#define PROC_FD_PATH_STR	"/proc/self/fd/"
-+#define PROC_FD_PATH_SZ		35
-+#endif
-+
-+#define _S(_t)			#_t
-+#define _V(...)			_S(__VA_ARGS__)
-+#define _X(_t)			_t
-+#define PROC_FD_PATH_MKSTR(_fd)	_V(_X(PROC_FD_PATH_STR)_X(_fd))
-+
- struct sys_proc_fd_path_buf {
--	char buf[35]; /* "/proc/self/fd/" + strlen(2^64) + 0-terminator */
-+	char buf[PROC_FD_PATH_SZ]; /* strlen(PROC_FD_PATH_STR) + strlen(2^64) + 0-terminator */
- };
- bool sys_have_proc_fds(void);
- char *sys_proc_fd_path(int fd, struct sys_proc_fd_path_buf *buf);
-diff -Naurp a/source3/lib/system.c b/source3/lib/system.c
---- a/source3/lib/system.c	2024-08-05 20:40:38.434801000 -0400
-+++ b/source3/lib/system.c	2024-08-05 20:41:16.625938000 -0400
-@@ -1068,7 +1068,7 @@ char *sys_proc_fd_path(int fd, struct sys_proc_fd_path
- char *sys_proc_fd_path(int fd, struct sys_proc_fd_path_buf *buf)
- {
- 	int written =
--		snprintf(buf->buf, sizeof(buf->buf), "/proc/self/fd/%d", fd);
-+		snprintf(buf->buf, sizeof(buf->buf), PROC_FD_PATH_MKSTR(%d), fd);
- 
- 	SMB_ASSERT(sys_have_proc_fds() && (written >= 0));
-