Resolves: #1955008 - rsync segfaults in --append mode when file on sender is large (> 2GB) and gets truncated

rsync-3.2.3-append-mode.patch

@@ -0,0 +1,36 @@
+diff --git a/rsync.1.md b/rsync.1.md
+index ec971ecc..7bb4c5a1 100644
+--- a/rsync.1.md
++++ b/rsync.1.md
+@@ -949,7 +949,9 @@ your home directory (remove the '=' for that).
+     existing content in the file (it only verifies the content that it is
+     appending).  Rsync skips any files that exist on the receiving side that
+     are not shorter than the associated file on the sending side (which means
+-    that new files are trasnferred).
++    that new files are trasnferred).  It also skips any files whose size on the
++    sending side gets shorter during the send negotiations (rsync warns about a
++    "diminished" file when this happens).
+ 
+     This does not interfere with the updating of a file's non-content
+     attributes (e.g.  permissions, ownership, etc.) when the file does not need
+diff --git a/sender.c b/sender.c
+index 94761c26..9cfca134 100644
+--- a/sender.c
++++ b/sender.c
+@@ -362,6 +362,16 @@ void send_files(int f_in, int f_out)
+ 			exit_cleanup(RERR_FILEIO);
+ 		}
+ 
++		if (append_mode > 0 && st.st_size < F_LENGTH(file)) {
++			rprintf(FWARNING, "skipped diminished file: %s\n",
++				full_fname(fname));
++			free_sums(s);
++			close(fd);
++			if (protocol_version >= 30)
++				send_msg_int(MSG_NO_SEND, ndx);
++			continue;
++		}
++
+ 		if (IS_DEVICE(st.st_mode) && st.st_size == 0)
+ 			st.st_size = get_device_size(fd, fname);
+ 

rsync.spec

@@ -10,7 +10,7 @@
 Summary: A program for synchronizing files over a network
 Name: rsync
 Version: 3.2.3
-Release: 6%{?dist}
+Release: 7%{?dist}
 URL: https://rsync.samba.org/
 
 Source0: https://download.samba.org/pub/rsync/src/rsync-%{version}%{?prerelease}.tar.gz
@@ -34,6 +34,7 @@ Patch0: rsync-3.2.2-ssl-verify-hostname.patch
 #Added due to rhbz#1873975 - default-acls test fail on s390x due to libacl
 Patch1: rsync-3.2.2-runtests.patch
 Patch2: rsync-3.2.3-lchmod.patch
+Patch3: rsync-3.2.3-append-mode.patch
 
 %description
 Rsync uses a reliable algorithm to bring remote and host files into
@@ -70,6 +71,7 @@ patch -p1 -i patches/copy-devices.diff
 %patch0 -p1 -b .verify-hostname
 %patch1 -p1 -b .runtests
 %patch2 -p1 -b .lchmod
+%patch3 -p1 -b .append-mode
 
 %build
 %configure --disable-xxhash
@@ -116,6 +118,9 @@ install -D -m644 %{SOURCE6} $RPM_BUILD_ROOT/%{_unitdir}/rsyncd@.service
 %systemd_postun_with_restart rsyncd.service
 
 %changelog
+* Mon May 31 2021 Michal Ruprich <mruprich@redhat.com> - 3.2.3-7
+- Resolves: #1955008 - rsync segfaults in --append mode when file on sender is large (> 2GB) and gets truncated
+
 * Fri Apr 16 2021 Mohan Boddu <mboddu@redhat.com> - 3.2.3-6
 - Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937