[PATCH] rpm: prevent race in tempdir creation

[PATCH] rpm: prevent race in tempdir creation

[Markus Lehtonen]

This patch fixes an extramely rare race condition in creation of rpmdb
temporary directory. The "rpmdb-more-verbose-error-logging" patch is
still left in place, just for the case.

[YOCTO #9416]

Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
---
 ...more-verbose-error-logging-in-rpmTempFile.patch | 26 ++------------
 .../rpmdb-prevent-race-in-tmpdir-creation.patch    | 41 ++++++++++++++++++++++
 meta/recipes-devtools/rpm/rpm_5.4.16.bb            |  1 +
 3 files changed, 44 insertions(+), 24 deletions(-)
 create mode 100644 meta/recipes-devtools/rpm/rpm/rpmdb-prevent-race-in-tmpdir-creation.patch

diff --git a/meta/recipes-devtools/rpm/rpm/rpmdb-more-verbose-error-logging-in-rpmTempFile.patch b/meta/recipes-devtools/rpm/rpm/rpmdb-more-verbose-error-logging-in-rpmTempFile.patch
index 809e54e..3a6f874 100644
--- a/meta/recipes-devtools/rpm/rpm/rpmdb-more-verbose-error-logging-in-rpmTempFile.patch
+++ b/meta/recipes-devtools/rpm/rpm/rpmdb-more-verbose-error-logging-in-rpmTempFile.patch
@@ -5,32 +5,10 @@ Upstream-Status: Inappropriate [debugging]
 Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
 
 diff --git a/rpmdb/signature.c b/rpmdb/signature.c
-index dce6c4e..a1d0f06 100644
+index 100204b..e56ab3d 100644
 --- a/rpmdb/signature.c
 +++ b/rpmdb/signature.c
-@@ -37,6 +37,7 @@ int rpmTempFile(const char * prefix, const char ** fnptr, void * fdptr)
-     int temput;
-     FD_t fd = NULL;
-     unsigned int ran;
-+    int ret = 0;
- 
-     if (!prefix) prefix = "";
- 
-@@ -44,8 +45,11 @@ int rpmTempFile(const char * prefix, const char ** fnptr, void * fdptr)
-     if (!_initialized) {
- 	_initialized = 1;
- 	tempfn = rpmGenPath(prefix, tpmacro, NULL);
--	if (rpmioMkpath(tempfn, 0755, (uid_t) -1, (gid_t) -1))
--	    goto errxit;
-+        ret = rpmioMkpath(tempfn, 0755, (uid_t) -1, (gid_t) -1);
-+        if (ret) {
-+            rpmlog(RPMLOG_ERR, _("error creating temporary directory %s: %d\n"), tempfn, ret);
-+            goto errxit;
-+        }
-     }
- 
-     /* XXX should probably use mkstemp here */
-@@ -68,12 +72,16 @@ int rpmTempFile(const char * prefix, const char ** fnptr, void * fdptr)
+@@ -72,12 +72,16 @@ int rpmTempFile(const char * prefix, const char ** fnptr, void * fdptr)
  #endif
  
  	temput = urlPath(tempfn, &tfn);
diff --git a/meta/recipes-devtools/rpm/rpm/rpmdb-prevent-race-in-tmpdir-creation.patch b/meta/recipes-devtools/rpm/rpm/rpmdb-prevent-race-in-tmpdir-creation.patch
new file mode 100644
index 0000000..f483f3a
--- /dev/null
+++ b/meta/recipes-devtools/rpm/rpm/rpmdb-prevent-race-in-tmpdir-creation.patch
@@ -0,0 +1,41 @@
+rpmdb: prevent race in tmpdir creation
+
+If two (or more) instances of rpm are running at the same time they may
+be trying to create the same (base-)temporary directory at the same time
+which causes the other mkdir to fail with EEXIST. This patch prevents a
+failure caused by this race by ignoring EEXIST error on directory
+creation.
+
+Upstream-Status: Pending
+
+Signed-off-by: Markus Lehtonen <markus.lehtonen@linux.intel.com>
+
+diff --git a/rpmdb/signature.c b/rpmdb/signature.c
+index dce6c4e..100204b 100644
+--- a/rpmdb/signature.c
++++ b/rpmdb/signature.c
+@@ -37,6 +37,7 @@ int rpmTempFile(const char * prefix, const char ** fnptr, void * fdptr)
+     int temput;
+     FD_t fd = NULL;
+     unsigned int ran;
++    int ret = 0;
+ 
+     if (!prefix) prefix = "";
+ 
+@@ -44,8 +45,11 @@ int rpmTempFile(const char * prefix, const char ** fnptr, void * fdptr)
+     if (!_initialized) {
+ 	_initialized = 1;
+ 	tempfn = rpmGenPath(prefix, tpmacro, NULL);
+-	if (rpmioMkpath(tempfn, 0755, (uid_t) -1, (gid_t) -1))
+-	    goto errxit;
++        ret = rpmioMkpath(tempfn, 0755, (uid_t) -1, (gid_t) -1);
++        if (ret && ret != EEXIST) {
++            rpmlog(RPMLOG_ERR, _("error creating temporary directory %s: %d\n"), tempfn, ret);
++            goto errxit;
++        }
+     }
+ 
+     /* XXX should probably use mkstemp here */
+-- 
+2.6.6
+
diff --git a/meta/recipes-devtools/rpm/rpm_5.4.16.bb b/meta/recipes-devtools/rpm/rpm_5.4.16.bb
index dd6e103..1332397 100644
--- a/meta/recipes-devtools/rpm/rpm_5.4.16.bb
+++ b/meta/recipes-devtools/rpm/rpm_5.4.16.bb
@@ -154,6 +154,7 @@ SRC_URI += " \
 	   file://rpm-rpmdb-grammar.patch \
 	   file://rpm-disable-blaketest.patch \
 	   file://rpm-autogen-force.patch \
+	   file://rpmdb-prevent-race-in-tmpdir-creation.patch \
 	   file://rpmdb-more-verbose-error-logging-in-rpmTempFile.patch \
 "
 
-- 
2.6.6