Patch Name: PHKL_25725

Patch Description: s700_800 11.00  Cumulative vfork(2) patch

Creation Date: 01/11/20

Post Date:  01/11/21

Hardware Platforms - OS Releases:
	s700: 11.00
	s800: 11.00

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_25725: CORRUPTION PANIC
	PHKL_20731: PANIC

Category Tags:
	defect_repair general_release critical panic corruption

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_25725

Symptoms:
	PHKL_25725:
	( SR:8606226816 CR:JAGad95878 )
	If a vfork(2) fails, it can result in unprotected
	modification of the reference count for the process'
	vas.  This race condition has the potential to cause
	a system panic, although internal testing was unable
	to produce one.

	PHKL_20731:
	Under severe memory pressure, system could panic with what
	appeared to be a bad pointer in vasusage().

Defect Description:
	PHKL_25725:
	( SR:8606226816 CR:JAGad95878 )
	Modification of the vas reference count was not protected
	by any locking mechanism.

	Resolution:
	Added a spinlock to protect modifications to the vas
	reference count.

	PHKL_20731:
	This was an MP race between vfork(2) and vmtotal().  If the
	system is out of RAM, vfork(2) can fail, and there was a
	small chance that a corrupt p_vas could result.
	Resolution:
	Acquire/release spinlocks around the critical section in
	vfork(2).

SR:
	1653306100 8606226816

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	/usr/conf/lib/libhp-ux.a(pm_procdup.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(pm_procdup.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	/usr/conf/lib/libhp-ux.a(pm_procdup.o):
		pm_procdup.c $Date: 2001/11/14 11:12:16 $Revision: r
			11ros/7 PATCH_11.00 (PHKL_25725)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(pm_procdup.o):
		pm_procdup.c $Date: 2001/11/14 11:12:16 $Revision: r
			11ros/7 PATCH_11.00 (PHKL_25725)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	3081954495 7748 /usr/conf/lib/libhp-ux.a(pm_procdup.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	3249711518 13768 /usr/conf/lib/libhp-ux.a(pm_procdup.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 11.00: PHKL_18543
	s800: 11.00: PHKL_18543

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_20731 

Equivalent Patches: None

Patch Package Size: 50 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_25725

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_25725.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_25725.  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_25725.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_25725.depot

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

		dd if=/tmp/PHKL_25725.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_18543.
	For successful installation please insure that PHKL_18543
	is already installed, or that PHKL_18543 is included
	in the same depot with this patch and PHKL_18543
	is selected for installation.