Patch Name: PHKL_27279

Patch Description: s700_800 11.11 VxVM B.03.12.4 panic in vol_dump_disks()

Creation Date: 02/06/27

Post Date:  02/07/19

Hardware Platforms - OS Releases:
	s700: 11.11
	s800: 11.11

Products:
	HPvxvm B.03.12.4

Filesets:
	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_32,v=HP
	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_27279: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_27279

Symptoms:
	PHKL_27279:
	System will panic when disk configuration is changed and
	"vxdctl enable" is run while Glance is running.

Defect Description:
	PHKL_27279:
	The vol_dump_disks() function uses improper locking and is
	exposed to a race condition:  After vol_dump_disks has
	allocated buffers to store information about a data
	structure, the structure grows concurrently with
	vol_dump_disks' execution.  This causes vol_dump_disks to
	overflow its buffers and corrupt kernel memory.  Since
	this is a memory corruption, the panic could occur
	in various places, but vol_dump_disks() will almost
	always be on the stack.

	Resolution:
	Fix locking strategy in vol_dump_disks(), and add new
	overflow checks to be sure that memory corruption
	will not occur.  This patch also fixes related locking
	problems in functions voldg_dump_groups() and
	voldg_delete_finish().

SR:
	8606264326

Patch Files:
	
	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvxvm.a(dg.o)
	/usr/conf/lib/libvxvm.a(disk.o)

	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvxvm.a(dg.o)
	/usr/conf/lib/libvxvm.a(disk.o)

what(1) Output:
	
	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvxvm.a(dg.o):
		dg.c $Date: 2002/06/26 15:15:19 $Revision: r11.11/1 
			PATCH_11.11 (PHKL_27279)
	/usr/conf/lib/libvxvm.a(disk.o):
		disk.c $Date: 2002/06/26 15:14:52 $Revision: r11.11/
			1 PATCH_11.11 (PHKL_27279)

	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvxvm.a(dg.o):
		dg.c $Date: 2002/06/26 15:15:19 $Revision: r11.11/1 
			PATCH_11.11 (PHKL_27279)
	/usr/conf/lib/libvxvm.a(disk.o):
		disk.c $Date: 2002/06/26 15:14:52 $Revision: r11.11/
			1 PATCH_11.11 (PHKL_27279)

cksum(1) Output:
	
	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_32,v=HP:
	2742674611 10140 /usr/conf/lib/libvxvm.a(dg.o)
	499237044 7816 /usr/conf/lib/libvxvm.a(disk.o)

	HPvxvm.VXVM-KRN,fr=B.03.12.4,fa=HP-UX_B.11.11_64,v=HP:
	542664462 24256 /usr/conf/lib/libvxvm.a(dg.o)
	734887618 16816 /usr/conf/lib/libvxvm.a(disk.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 80 KBytes

Installation Instructions:
	Please review all instructions and the Hewlett-Packard
	SupportLine User Guide or your Hewlett-Packard support terms
	and conditions for precautions, scope of license,
	restrictions, and, limitation of liability and warranties,
	before installing this patch.
	------------------------------------------------------------
	1. Back up your system before installing a patch.

	2. Login as root.

	3. Copy the patch to the /tmp directory.

	4. Move to the /tmp directory and unshar the patch:

		cd /tmp
		sh PHKL_27279

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_27279.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_27279.  If you do not wish to retain a
	copy of the original software, include the patch_save_files
	option in the swinstall command above:

		-x patch_save_files=false

	WARNING: If patch_save_files is false when a patch is installed,
		 the patch cannot be deinstalled.  Please be careful
		 when using this feature.

	For future reference, the contents of the PHKL_27279.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_27279.depot

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHKL_27279.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None