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authorBodo Stroesser <bstroesser@fujitsu-siemens.com>2006-03-27 01:14:34 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-27 08:44:38 -0800
commit81efcd3300754462537ffac60336158b2f773b4e (patch)
treef957ccb8cacabcecf5cfd67c1feda5b1908cac0c /arch/um/kernel/Makefile
parentf206aabb035318ac4bafbf0b87798335de3634df (diff)
downloadlinux-81efcd3300754462537ffac60336158b2f773b4e.tar.bz2
[PATCH] uml: more carefully test whether we are in a system call
For security reasons, UML in is_syscall() needs to have access to code in vsyscall-page. The current implementation grants this access by explicitly allowing access to vsyscall in access_ok_skas(). With this change, copy_from_user() may be used to read the code. Ptrace access to vsyscall-page for debugging already was implemented in get_user_pages() by mainline. In i386, copy_from_user can't access vsyscall-page, but returns EFAULT. To make UML behave as i386 does, I changed is_syscall to use access_process_vm(current) to read the code from vsyscall-page. This doesn't hurt security, but simplifies the code and prepares implementation of stub-vmas. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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