Attachment 256497 Details for Bug 277878 – Patch to fix pathref handling in Samba 4.19

[patch] Patch to fix pathref handling in Samba 4.19

freebsd_pathref_zfsacl_max.patch (text/plain), 11.59 KB, created by Peter Eriksson on 2025-01-07 09:18:21 UTC

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Creator: Peter Eriksson

Created: 2025-01-07 09:18:21 UTC

Size: 11.59 KB

patch

obsolete

>--- samba-4.18.3-orig/source3/smbd/open.c	2023-04-19 12:18:56.254875400 +0200
>+++ samba-4.18.3/source3/smbd/open.c	2023-06-20 08:29:06.210298000 +0200
>@@ -1204,9 +1204,6 @@
> 	int new_fd;
> 	NTSTATUS status;
> 
>-	if (!fsp->fsp_flags.have_proc_fds) {
>-		return NT_STATUS_MORE_PROCESSING_REQUIRED;
>-	}
> 
> 	old_fd = fsp_get_pathref_fd(fsp);
> 	if (old_fd == -1) {
>@@ -1222,22 +1219,28 @@
> 		return NT_STATUS_INVALID_HANDLE;
> 	}
> 
>-	p = sys_proc_fd_path(old_fd, buf, sizeof(buf));
>-	if (p == NULL) {
>-		return NT_STATUS_NO_MEMORY;
>-	}
>+	
>+	if (sys_open_real_fd_from_pathref_fd(old_fd, &new_fd, flags) != 0) {
>+		if (!fsp->fsp_flags.have_proc_fds) {
>+			return NT_STATUS_MORE_PROCESSING_REQUIRED;
>+		}
> 
>-	proc_fname = (struct smb_filename) {
>-		.base_name = discard_const_p(char, p),
>-	};
>+		p = sys_proc_fd_path(old_fd, buf, sizeof(buf));
>+		if (p == NULL) {
>+			return NT_STATUS_NO_MEMORY;
>+		}
> 
>-	fsp->fsp_flags.is_pathref = false;
>+		proc_fname = (struct smb_filename) {
>+			.base_name = discard_const_p(char, p),
>+		};
> 
>-	new_fd = SMB_VFS_OPENAT(fsp->conn,
>-				fsp->conn->cwd_fsp,
>-				&proc_fname,
>-				fsp,
>-				&how);
>+		new_fd = SMB_VFS_OPENAT(fsp->conn,
>+					fsp->conn->cwd_fsp,
>+					&proc_fname,
>+					fsp,
>+					&how);
>+	}
>+
> 	if (new_fd == -1) {
> 		status = map_nt_error_from_unix(errno);
> 		fd_close(fsp);
>@@ -1250,6 +1260,8 @@
> 	}
> 
> 	fsp_set_fd(fsp, new_fd);
>+	fsp->fsp_flags.is_pathref = false;
>+	
> 	return NT_STATUS_OK;
> }
> 
>--- samba-4.18.3-orig/source3/lib/system.c	2023-01-18 16:32:24.174553200 +0100
>+++ samba-4.18.3/source3/lib/system.c	2023-06-19 23:35:30.132465000 +0200
>@@ -1022,6 +1022,8 @@
> } proc_fd_patterns[] = {
> 	/* Linux */
> 	{ "/proc/self/fd/%d", "/proc/self/fd/0" },
>+	/* FreeBSD */
>+	{ "/compat/linux/dev/fd/%d", "/compat/linux/dev/fd/0" },
> 	{ NULL, NULL },
> };
> 
>@@ -1077,4 +1079,27 @@
> 	}
> 
> 	return buf;
>+}
>+
>+
>+/* Helper function that opens a usable fd for accessing data
>+   (metadata & content) from a pathref fd */
>+int sys_open_real_fd_from_pathref_fd(int fd,
>+				     int *rfd,
>+				     int flags) {
>+	int tfd;
>+
>+#if defined(HAVE_OPENAT) && defined(O_EMPTY_PATH)
>+	/* This works for FreeBSD 13+ atleast */
>+	
>+	tfd = openat(fd, "", O_EMPTY_PATH|flags);
>+	if (tfd < 0) {
>+		return errno;
>+	}
>+
>+	*rfd = tfd;
>+	return 0;
>+#else
>+	return ENOSYS;
>+#endif
> }
>--- samba-4.18.3-orig/source3/modules/vfs_default.c	2023-05-31 18:06:44.154299500 +0200
>+++ samba-4.18.3/source3/modules/vfs_default.c	2023-06-19 23:23:58.116903000 +0200
>@@ -2721,7 +2721,7 @@
> 
> static int vfswrap_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
> {
>-	int result;
>+	int result, fd, real_fd;
> 
> 	START_PROFILE(syscall_fchmod);
> 
>@@ -2731,8 +2731,9 @@
> 		return result;
> 	}
> 
>+	fd = fsp_get_pathref_fd(fsp);
>+
> 	if (fsp->fsp_flags.have_proc_fds) {
>-		int fd = fsp_get_pathref_fd(fsp);
> 		const char *p = NULL;
> 		char buf[PATH_MAX];
> 
>@@ -2746,6 +2747,17 @@
> 		return result;
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno;
>+	  
>+		result = fchmod(real_fd, mode);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		END_PROFILE(syscall_fchmod);
>+		return result;
>+	}
>+
> 	/*
> 	 * This is no longer a handle based call.
> 	 */
>@@ -2758,7 +2770,7 @@
> static int vfswrap_fchown(vfs_handle_struct *handle, files_struct *fsp, uid_t uid, gid_t gid)
> {
> #ifdef HAVE_FCHOWN
>-	int result;
>+	int result, fd, real_fd;
> 
> 	START_PROFILE(syscall_fchown);
> 	if (!fsp->fsp_flags.is_pathref) {
>@@ -2767,8 +2779,9 @@
> 		return result;
> 	}
> 
>+	fd = fsp_get_pathref_fd(fsp);
>+	
> 	if (fsp->fsp_flags.have_proc_fds) {
>-		int fd = fsp_get_pathref_fd(fsp);
> 		const char *p = NULL;
> 		char buf[PATH_MAX];
> 
>@@ -2782,6 +2795,17 @@
> 		return result;
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno;
>+	  
>+		result = fchown(real_fd, uid, gid);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		END_PROFILE(syscall_fchown);
>+		return result;
>+	}
>+
> 	/*
> 	 * This is no longer a handle based call.
> 	 */
>@@ -2855,7 +2879,7 @@
> 			   files_struct *fsp,
> 			   struct smb_file_time *ft)
> {
>-	int result = -1;
>+	int result = -1, fd, real_fd;
> 	struct timespec ts[2];
> 	struct timespec *times = NULL;
> 
>@@ -2900,8 +2924,9 @@
> 		goto out;
> 	}
> 
>+	fd = fsp_get_pathref_fd(fsp);
>+	
> 	if (fsp->fsp_flags.have_proc_fds) {
>-		int fd = fsp_get_pathref_fd(fsp);
> 		const char *p = NULL;
> 		char buf[PATH_MAX];
> 
>@@ -2919,6 +2944,16 @@
> 		goto out;
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno;
>+	  
>+		result = futimens(real_fd, times);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		goto out;
>+	}
>+
> 	/*
> 	 * The fd is a pathref (opened with O_PATH) and there isn't fd to
> 	 * path translation mechanism. Fallback to path based call.
>@@ -3322,6 +3357,7 @@
> {
> #ifdef HAVE_FCHFLAGS
> 	int fd = fsp_get_pathref_fd(fsp);
>+	int real_fd;
> 
> 	SMB_ASSERT(!fsp_is_alternate_stream(fsp));
> 
>@@ -3341,6 +3377,16 @@
> 		return chflags(p, flags);
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+	  int saved_errno, result;
>+	  
>+		result = fchflags(real_fd, flags);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		return result;
>+	}
>+
> 	/*
> 	 * This is no longer a handle based call.
> 	 */
>@@ -3569,6 +3615,7 @@
> 				 size_t size)
> {
> 	int fd = fsp_get_pathref_fd(fsp);
>+	int real_fd;
> 
> 	SMB_ASSERT(!fsp_is_alternate_stream(fsp));
> 
>@@ -3588,6 +3635,16 @@
> 		return getxattr(p, name, value, size);
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno, result;
>+	  
>+		result = fgetxattr(real_fd, name, value, size);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		return result;
>+	}
>+
> 	/*
> 	 * This is no longer a handle based call.
> 	 */
>@@ -3895,6 +3952,7 @@
> static ssize_t vfswrap_flistxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, char *list, size_t size)
> {
> 	int fd = fsp_get_pathref_fd(fsp);
>+	int real_fd;
> 
> 	SMB_ASSERT(!fsp_is_alternate_stream(fsp));
> 
>@@ -3914,6 +3972,16 @@
> 		return listxattr(p, list, size);
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno, result;
>+	  
>+		result = flistxattr(real_fd, list, size);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		return result;
>+	}
>+
> 	/*
> 	 * This is no longer a handle based call.
> 	 */
>@@ -3923,6 +3991,7 @@
> static int vfswrap_fremovexattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name)
> {
> 	int fd = fsp_get_pathref_fd(fsp);
>+	int real_fd;
> 
> 	SMB_ASSERT(!fsp_is_alternate_stream(fsp));
> 
>@@ -3942,6 +4011,16 @@
> 		return removexattr(p, name);
> 	}
> 
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno, result;
>+	  
>+		result = fremovexattr(real_fd, name);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		return result;
>+	}
>+
> 	/*
> 	 * This is no longer a handle based call.
> 	 */
>@@ -3951,6 +4030,7 @@
> static int vfswrap_fsetxattr(struct vfs_handle_struct *handle, struct files_struct *fsp, const char *name, const void *value, size_t size, int flags)
> {
> 	int fd = fsp_get_pathref_fd(fsp);
>+	int real_fd;
> 
> 	SMB_ASSERT(!fsp_is_alternate_stream(fsp));
> 
>@@ -3968,6 +4048,16 @@
> 		}
> 
> 		return setxattr(p, name, value, size, flags);
>+	}
>+
>+	if (sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+		int saved_errno, result;
>+	  
>+		result = fsetxattr(real_fd, name, value, size, flags);
>+		saved_errno = errno;
>+		close(real_fd);
>+		errno = saved_errno;
>+		return result;
> 	}
> 
> 	/*
>--- samba-4.18.3-orig/source3/modules/vfs_zfsacl.c	2023-01-18 16:32:24.210553400 +0100
>+++ samba-4.18.3/source3/modules/vfs_zfsacl.c	2023-06-20 08:51:53.077953000 +0200
>@@ -234,13 +234,39 @@
> 
> 	SMB_ASSERT(i == naces);
> 
>-	/* store acl */
>-	fd = fsp_get_pathref_fd(fsp);
>-	if (fd == -1) {
>-		errno = EBADF;
>-		return false;
>+	if (!fsp->fsp_flags.is_pathref) {
>+		rv = facl(fsp_get_io_fd(fsp), ACE_SETACL, naces, acebuf);
>+	} else {
>+		const char *procfd_p = NULL;
>+		char buf[PATH_MAX];
>+
>+		fd = fsp_get_pathref_fd(fsp);
>+		if (fsp->fsp_flags.have_proc_fds && (procfd_p = sys_proc_fd_path(fd, buf, sizeof(buf)))) {
>+			rv = acl(procfd_p, ACE_SETACL, naces, acebuf);
>+		} else {
>+			int real_fd;
>+
>+			fd = fsp_get_pathref_fd(fsp);
>+		
>+			/* First try this for versions of FreeBSD 13+ that allows facl() on O_PATH fd's */
>+			rv = facl(fd, ACE_SETACL, naces, acebuf);
>+		
>+			if (rv < 0 && errno == EBADF &&
>+			    sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+				/* Works on FreeBSD 13+ */
>+				int saved_errno;
>+
>+				rv = facl(real_fd, ACE_SETACL, naces, acebuf);
>+				saved_errno = errno;
>+				close(real_fd);
>+				errno = saved_errno;
>+			} else {
>+				/* Last ditch fallback */
>+				rv = acl(fsp->fsp_name->base_name, ACE_SETACL, naces, acebuf);
>+			}
>+		}
> 	}
>-	rv = facl(fd, ACE_SETACL, naces, acebuf);
>+
> 	if (rv != 0) {
> 		if(errno == ENOSYS) {
> 			DEBUG(9, ("acl(ACE_SETACL, %s): Operation is not "
>@@ -284,14 +310,39 @@
> {
> 	int naces, rv;
> 	ace_t *acebuf = NULL;
>-	int fd;
>+	int fd = -1;
>+	const char *procfd_p = NULL;
>+	char buf[PATH_MAX];
> 
>-	fd = fsp_get_pathref_fd(fsp);
>-	if (fd == -1) {
>-		errno = EBADF;
>-		return -1;
>+	if (!fsp->fsp_flags.is_pathref) {
>+		naces = facl(fsp_get_io_fd(fsp), ACE_GETACLCNT, 0, NULL);
>+	} else {
>+	  	fd = fsp_get_pathref_fd(fsp);
>+		
>+		if (fsp->fsp_flags.have_proc_fds && (procfd_p = sys_proc_fd_path(fd, buf, sizeof(buf)))) {
>+			/* If we have procfd support, try this first */
>+			naces = acl(procfd_p, ACE_GETACLCNT, 0, NULL);
>+		} else {
>+			int real_fd;
>+
>+			/* First try this for versions of FreeBSD 13+ that allows facl() on O_PATH fd's */
>+			naces = facl(fd, ACE_GETACLCNT, 0, NULL);
>+			if (naces < 0 && errno == EBADF &&
>+			    sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+				/* Works on FreeBSD 13+ */
>+				int saved_errno;
>+
>+				naces = facl(real_fd, ACE_GETACLCNT, 0, NULL);
>+				saved_errno = errno;
>+				close(real_fd);
>+				errno = saved_errno;
>+			} else {
>+				/* Last ditch fallback */
>+				naces = acl(fsp->fsp_name->base_name, ACE_GETACLCNT, 0, NULL);
>+			}
>+		}
> 	}
>-	naces = facl(fd, ACE_GETACLCNT, 0, NULL);
>+
> 	if (naces == -1) {
> 		int dbg_level = 10;
> 
>@@ -309,7 +360,32 @@
> 		return -1;
> 	}
> 
>-	rv = facl(fd, ACE_GETACL, naces, acebuf);
>+	if (!fsp->fsp_flags.is_pathref) {
>+		rv = facl(fsp_get_io_fd(fsp), ACE_GETACL, naces, acebuf);
>+	} else {
>+		if (procfd_p) {
>+			rv = acl(procfd_p, ACE_GETACL, naces, acebuf);
>+		} else {
>+			int real_fd;
>+
>+			/* First try this for versions of FreeBSD that allows facl() on O_PATH fd's */
>+			rv = facl(fd, ACE_GETACL, naces, acebuf);
>+			if (rv < 0 && errno == EBADF &&
>+			    sys_open_real_fd_from_pathref_fd(fd, &real_fd, O_RDONLY|O_NONBLOCK) == 0) {
>+				/* Works on FreeBSD 13+ */
>+				int saved_errno;
>+
>+				rv = facl(real_fd, ACE_GETACL, naces, acebuf);
>+				saved_errno = errno;
>+				close(real_fd);
>+				errno = saved_errno;
>+			} else {
>+				/* Last ditch fallback */
>+				rv = acl(fsp->fsp_name->base_name, ACE_GETACL, naces, acebuf);
>+			}
>+		}
>+	}
>+
> 	if (rv == -1) {
> 		DBG_DEBUG("acl(ACE_GETACL, %s): %s ",
> 			  fsp_str_dbg(fsp), strerror(errno));
>--- samba-4.18.3-orig/source3/include/proto.h	2023-05-31 18:06:44.142299400 +0200
>+++ samba-4.18.3/source3/include/proto.h	2023-06-19 23:23:58.115127000 +0200
>@@ -211,6 +211,10 @@
> bool sys_have_proc_fds(void);
> const char *sys_proc_fd_path(int fd, char *buf, size_t bufsize);
> 
>+int sys_open_real_fd_from_pathref_fd(int fd,
>+				     int *mfd,
>+				     int flags);
>+
> struct stat;
> void init_stat_ex_from_stat (struct stat_ex *dst,
> 			    const struct stat *src,

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Attachments on bug 277878: 249703 | 249849 | 256497 | 256506 | 256507