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[PATCH] uml: increase granularity of host capability checking

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This change enables SKAS0/SKAS3 to work with all combinations of /proc/mm and
PTRACE_FAULTINFO being available or not.

Also it changes the initialization of proc_mm and ptrace_faultinfo slightly,
to ease forcing SKAS0 on a patched host.  Forcing UML to run without /proc/mm
or PTRACE_FAULTINFO by cmdline parameter can be implemented with a setup
resetting the related variable.

Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Bodo Stroesser
2005-09-03 15:57:49 -07:00
committed by Linus Torvalds
parent 60d339f6fe
commit 8b51304ed3
4 changed files with 96 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
arch/um/kernel/skas/process_kern.c
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@ -129,7 +129,9 @@ int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
return(0);
}
int new_mm(int from)
extern void map_stub_pages(int fd, unsigned long code,
unsigned long data, unsigned long stack);
int new_mm(int from, unsigned long stack)
{
struct proc_mm_op copy;
int n, fd;
@ -148,6 +150,9 @@ int new_mm(int from)
"err = %d\n", -n);
}
if(!ptrace_faultinfo)
map_stub_pages(fd, CONFIG_STUB_CODE, CONFIG_STUB_DATA, stack);
return(fd);
}