Add "Access d_bdev before dropping inode" patch

* 0005-oracleasm-Access-d_bdev-before-dropping-inode.patch: New file.
* kmod-redhat-oracleasm.spec (kmod_rpm_release): Bump to 18.1.
(kmod_kernel_version, kmod_kernel_version_min): Bump to 4.18.0-552%{dist}.
(Patch5): New patch.
(%prep): Apply it.
(%changelog): Mention the change.

Resolves: RHEL-30468
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>

0005-oracleasm-Access-d_bdev-before-dropping-inode.patch

@@ -0,0 +1,47 @@
+commit a6982d0edd0caeb2a7a0f3465c0adf85a902102a
+Author: Stephen Brennan stephen.s.brennan@oracle.com
+Date: Mon Sep 14 16:03:32 2020 -0700
+
+oracleasm: Access d_bdev before dropping inode
+
+d_bdev is stored alongside the inode. If we hold the last reference to
+disk_inode, then iput() will clear the d_bdev field and cause a page
+fault when it is dereferenced. Further, the iput() could result in a
+blkdev_put(), after which our accesses to bdev could be further
+corrupted. To avoid all this, delay the iput() until all access to d,
+disk_inode, and bdev are complete.
+
+Ora bug: 31901945
+Signed-off-by: Stephen Brennan stephen.s.brennan@oracle.com
+Reviewed-by: Junxiao Bi junxiao.bi@oracle.com
+Signed-off-by: Somasundaram Krishnasamy somasundaram.krishnasamy@oracle.com
+
+diff --git a/drivers/block/oracleasm/driver.c b/drivers/block/oracleasm/driver.c
+index 2bcad19af0d8..02882105f799 100644
+--- a/drivers/block/oracleasm/driver.c
++++ b/drivers/block/oracleasm/driver.c
+@@ -2380,7 +2380,6 @@ static ssize_t asmfs_svc_query_handle(struct file *file, char *buf, size_t size)
+ 	}
+ 
+ 	d = ASMDISK_I(disk_inode);
+-	iput(disk_inode);
+ 	bdev = d->d_bdev;
+ 
+ 	qh_info->qh_max_sectors = compute_max_sectors(bdev);
+@@ -2395,6 +2394,15 @@ static ssize_t asmfs_svc_query_handle(struct file *file, char *buf, size_t size)
+ 	trace_queryhandle(bdev, qh_info);
+ 	ret = 0;
+ 
++	/*
++	 * Dropping the reference to disk_inode could result in d and
++	 * disk_inode being evicted and freed. This will further drop the
++	 * reference to bdev, which could be the last one. Thus, we must
++	 * delay the iput() until all accesses to disk_inode, d, and bdev
++	 * are complete.
++	 */
++	iput(disk_inode);
++
+ out:
+ 	qh_info->qh_abi.ai_status = ret;
+ 	return size;
+

kmod-redhat-oracleasm.spec

@@ -3,9 +3,9 @@
 %define kmod_rpm_name		kmod-redhat-oracleasm
 %define kmod_driver_version	2.0.8
 %define kmod_driver_epoch	8
-%define kmod_rpm_release	18
-%define kmod_kernel_version	4.18.0-507.el8
-%define kmod_kernel_version_min	4.18.0-507.el8
+%define kmod_rpm_release	18.1
+%define kmod_kernel_version	4.18.0-552%{dist}
+%define kmod_kernel_version_min	4.18.0-552%{dist}
 %define kmod_kernel_version_dep	4.18.0
 %define kmod_kbuild_dir		drivers/block/oracleasm
 %define kmod_install_path	extra/kmod-redhat-oracleasm
@@ -13,7 +13,6 @@
 %define kernel_devel_pkg	kernel-devel
 %define kernel_modules_pkg	kernel-modules
 
-%{!?dist: %define dist .el8_4}
 %{!?make_build: %define make_build make}
 
 %if "%{kmod_kernel_version_dep}" == ""
@@ -28,6 +27,7 @@ Patch0:	0000-Makefile-config-opts.patch
 Patch2:	0002-oracleasm-driver-make-bio_for_each_segment_all-worki.patch
 Patch3:	0003-oracleasm-copy-rhel8-s-bio_map_user_iov.patch
 Patch4:	0004-update-bdi-writeback-acct_dirty-flags.patch
+Patch5:	0005-oracleasm-Access-d_bdev-before-dropping-inode.patch
 
 %define findpat %( echo "%""P" )
 %define __find_requires /usr/lib/rpm/redhat/find-requires.ksyms
@@ -157,6 +157,7 @@ exit 0
 %patch2 -p1
 %patch3 -p1
 %patch4 -p1
+%patch5 -p1
 set -- *
 mkdir source
 mv "$@" source/
@@ -219,6 +220,9 @@ install -m 644 -D source/greylist.txt $RPM_BUILD_ROOT/usr/share/doc/%{kmod_rpm_n
 rm -rf $RPM_BUILD_ROOT
 
 %changelog
+* Mon Apr 08 2024 Eugene Syromiatnikov <esyr@redhat.com> 2.0.8-18.1
+- Fix use-after-free in asmfs_svc_query_handle (RHEL-30468).
+
 * Wed Jan 04 2023 Eugene Syromiatnikov <esyr@redhat.com> 2.0.8-18
 - Rebuild against kernel-4.18.0-507.el8 (#2228579).