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From 13f70e3710b2df49a923cc6450ff4a8f86e65666 Mon Sep 17 00:00:00 2001
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Message-Id: <13f70e3710b2df49a923cc6450ff4a8f86e65666.1555050140.git.pmatilai@redhat.com>
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From: Panu Matilainen <pmatilai@redhat.com>
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Date: Wed, 20 Mar 2019 12:38:00 +0200
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Subject: [PATCH] Fix FA_TOUCH on files with suid/sgid bits and/or capabilities
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FA_TOUCH used to set suffix to "" instead of NULL which causes fsmCommit()
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to rename the file onto itself, which is a bit dumb but mostly harmless
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with regular permission. On suid/sgid/capabilities we strip any extra
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privileges on rename to make sure hardlinks are neutered, and because
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rename occurs after other permissions etc setting, on FA_TOUCH those
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extra privileges are stripped and much brokenness will follow.
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A more minimal fix would be a strategically placed strcmp(), but NULL
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is what the rest of the fsm expects for no suffix and differentiating
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between empty and NULL suffix is too subtle for its own good as
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witnessed here. So now, NULL suffix is no suffix again and the rest
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of the code will do the right thing except where related to creation,
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and creation is what FA_TOUCH wont do so lets just explicitly skip it
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and restore the original code otherwise. The goto is ugly but reindenting
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gets even uglier, shrug. Add a test-case to go with it.
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This has been broken since its introduction in commit
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79ca74e15e15c1d91a9a31a9ee90abc91736f390 so all current 4.14.x versions
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are affected.
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---
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 lib/fsm.c                         | 17 ++++++++++----
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 tests/data/SPECS/replacetest.spec |  2 +-
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 tests/rpmverify.at                | 38 ++++++++++++++++++++++++++++++-
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 3 files changed, 50 insertions(+), 7 deletions(-)
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diff --git a/lib/fsm.c b/lib/fsm.c
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index 8eb2c185c..432bcbd90 100644
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--- a/lib/fsm.c
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+++ b/lib/fsm.c
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@@ -898,12 +898,12 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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 	action = rpmfsGetAction(fs, rpmfiFX(fi));
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 	skip = XFA_SKIPPING(action);
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-	suffix = S_ISDIR(rpmfiFMode(fi)) ? NULL : tid;
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 	if (action != FA_TOUCH) {
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-	    fpath = fsmFsPath(fi, suffix);
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+	    suffix = S_ISDIR(rpmfiFMode(fi)) ? NULL : tid;
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 	} else {
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-	    fpath = fsmFsPath(fi, "");
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+	    suffix = NULL;
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 	}
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+	fpath = fsmFsPath(fi, suffix);
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 	/* Remap file perms, owner, and group. */
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 	rc = rpmfiStat(fi, 1, &sb);
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@@ -926,6 +926,10 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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         if (!skip) {
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 	    int setmeta = 1;
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+	    /* When touching we don't need any of this... */
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+	    if (action == FA_TOUCH)
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+		goto touch;
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+
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 	    /* Directories replacing something need early backup */
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 	    if (!suffix) {
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 		rc = fsmBackup(fi, action);
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@@ -934,7 +938,7 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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 	    if (!suffix) {
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 		rc = fsmVerify(fpath, fi);
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 	    } else {
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-		rc = (action == FA_TOUCH) ? 0 : RPMERR_ENOENT;
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+		rc = RPMERR_ENOENT;
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 	    }
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             if (S_ISREG(sb.st_mode)) {
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@@ -970,11 +974,14 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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                 if (!IS_DEV_LOG(fpath))
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                     rc = RPMERR_UNKNOWN_FILETYPE;
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             }
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+
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+touch:
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 	    /* Set permissions, timestamps etc for non-hardlink entries */
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 	    if (!rc && setmeta) {
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 		rc = fsmSetmeta(fpath, fi, plugins, action, &sb, nofcaps);
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 	    }
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         } else if (firsthardlink >= 0 && rpmfiArchiveHasContent(fi)) {
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+	    /* On FA_TOUCH no hardlinks are created thus this is skipped. */
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 	    /* we skip the hard linked file containing the content */
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 	    /* write the content to the first used instead */
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 	    char *fn = rpmfilesFN(files, firsthardlink);
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@@ -987,7 +994,7 @@ int rpmPackageFilesInstall(rpmts ts, rpmte te, rpmfiles files,
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         if (rc) {
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             if (!skip) {
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                 /* XXX only erase if temp fn w suffix is in use */
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-                if (suffix && (action != FA_TOUCH)) {
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+                if (suffix) {
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 		    (void) fsmRemove(fpath, sb.st_mode);
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                 }
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                 errno = saveerrno;
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diff --git a/tests/data/SPECS/replacetest.spec b/tests/data/SPECS/replacetest.spec
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index 54974567b..d5a1729d3 100644
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--- a/tests/data/SPECS/replacetest.spec
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+++ b/tests/data/SPECS/replacetest.spec
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@@ -46,4 +46,4 @@ rm -rf $RPM_BUILD_ROOT
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 %files
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 %defattr(-,%{user},%{grp},-)
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-/opt/*
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+%{?fileattr} /opt/*
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diff --git a/tests/rpmverify.at b/tests/rpmverify.at
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index 52ee2abfb..f7dd57531 100644
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--- a/tests/rpmverify.at
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+++ b/tests/rpmverify.at
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@@ -575,3 +575,39 @@
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 ],
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 [])
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 AT_CLEANUP
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+
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+AT_SETUP([Upgraded verification with min_writes 5 (suid files)])
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+AT_KEYWORDS([upgrade verify min_writes])
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+AT_CHECK([
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+RPMDB_CLEAR
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+RPMDB_INIT
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+tf="${RPMTEST}"/opt/foo
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+rm -rf "${tf}" "${tf}".rpm*
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+rm -rf "${TOPDIR}"
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+
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+for v in "1.0" "2.0"; do
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+    runroot rpmbuild --quiet -bb \
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+        --define "ver $v" \
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+	--define "filetype file" \
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+	--define "filedata foo" \
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+	--define "fileattr %attr(2755,-,-)" \
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+          /data/SPECS/replacetest.spec
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+done
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+
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+runroot rpm -U /build/RPMS/noarch/replacetest-1.0-1.noarch.rpm
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+runroot rpm -Va --nouser --nogroup replacetest
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+runroot rpm -U \
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+	--define "_minimize_writes 1" \
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+	 /build/RPMS/noarch/replacetest-2.0-1.noarch.rpm
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+runroot rpm -Va --nouser --nogroup replacetest
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+chmod 777 "${tf}"
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+runroot rpm -U \
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+	--oldpackage \
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+	--define "_minimize_writes 1" \
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+	 /build/RPMS/noarch/replacetest-1.0-1.noarch.rpm
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+runroot rpm -Va --nouser --nogroup replacetest
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+],
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+[0],
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+[],
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+[])
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+AT_CLEANUP
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-- 
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2.20.1
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