Patch Name: PHKL_28488

Patch Description: s700_800 11.00 copyin EFAULT, LDCD access type

Creation Date: 03/01/15

Post Date: 03/02/18

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_28488: HANG
	PHKL_24005: OTHER
		application sees EFAULT even while using a valid
		address.

Category Tags:
	defect_repair general_release critical halts_system

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_28488

Symptoms:
	PHKL_28488:
	( SR:8606287496 CR:JAGae51435 )
	A 64bit application calling fork() may experience an
	interruptible hang.

	PHKL_24005:
	( SR: 8606157079 CR:JAGad26413)
	System returns Bad address (EFAULT) even when the
	application supplied a valid address.

Defect Description:
	PHKL_28488:
	( SR:8606287496 CR:JAGae51435 )
	If the first access to a copy on write page after a fork()
	is an LDCD (load and clear double) instruction, when
	resolving the protection (access) fault, the access type
	is incorrectly determined to be a READ instead of a WRITE,
	thus resulting in a recursive protection fault and
	interruptible process hang.

	Resolution:
	Updated the access type checking routines to correctly
	return WRITE for LDCD instructions.

	PHKL_24005:
	( SR: 8606157079 CR:JAGad26413)
	The system checks the access rights for the page twice
	before copying a page in memory. The second check is
	done if the page was not already in memory and was
	brought in by a fault. This second check can fail
	under a race condition.
	Resolution:
	The solution is not to check the access rights again if
	the fault is resolved - resolving the fault ensures that
	the page is in memory with proper access rights.

Enhancement:
	No

SR:
	8606157079 8606287496

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(vm_mapcall.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(vm_mapcall.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(vm_mapcall.o):
		vm_mapcall.c $Date: 2003/01/06 08:21:25 $Revision: r
			11ros/4 PATCH_11.00 (PHKL_28488)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(vm_mapcall.o):
		vm_mapcall.c $Date: 2003/01/06 08:21:25 $Revision: r
			11ros/4 PATCH_11.00 (PHKL_28488)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	1540202931 9380 /usr/conf/lib/libhp-ux.a(vm_mapcall.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	1973053988 28152 /usr/conf/lib/libhp-ux.a(vm_mapcall.o)

Patch Conflicts: None

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

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_24005 

Equivalent Patches: None

Patch Package Size: 60 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_28488

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_28488.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_28488.  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_28488.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_28488.depot

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

		dd if=/tmp/PHKL_28488.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None