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authorBodo Stroesser <bstroesser@fujitsu-siemens.com>2005-07-07 17:56:50 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2005-07-07 18:23:44 -0700
commit9786a8f3cbc61f990266e23ffdb338ee3118b03d (patch)
treec987811d30508728f954cc8aaa14de1f7fa5b44a /arch/um/kernel/skas/mmu.c
parentd67b569f5f620c0fb95d5212642746b7ba9d29e4 (diff)
[PATCH] uml: Proper clone support for skas0
This patch implements the clone-stub mechanism, which allows skas0 to run with proc_mm==0, even if the clib in UML uses modify_ldt. Note: There is a bug in skas3.v7 host patch, that avoids UML-skas from running properly on a SMP-box. In full skas3, I never really saw problems, but in skas0 they showed up. More commentary by jdike - What this patch does is makes sure that the host parent of each new host process matches the UML parent of the corresponding UML process. This ensures that any changed LDTs are inherited. This is done by having clone actually called by the UML process from its stub, rather than by the kernel. We have special syscall stubs that are loaded onto the stub code page because that code must be completely self-contained. These stubs are given C interfaces, and used like normal C functions, but there are subtleties. Principally, we have to be careful about stack variables in stub_clone_handler after the clone. The code is written so that there aren't any - everything boils down to a fixed address. If there were any locals, references to them after the clone would be wrong because the stack just changed. 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>
Diffstat (limited to 'arch/um/kernel/skas/mmu.c')
-rw-r--r--arch/um/kernel/skas/mmu.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 511a855c9ec..d232daa42c3 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -75,6 +75,7 @@ static int init_stub_pte(struct mm_struct *mm, unsigned long proc,
int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
{
struct mm_struct *cur_mm = current->mm;
+ struct mm_id *cur_mm_id = &cur_mm->context.skas.id;
struct mm_id *mm_id = &mm->context.skas.id;
unsigned long stack;
int from, ret;
@@ -115,7 +116,11 @@ int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
goto out_free;
mm->nr_ptes--;
- mm_id->u.pid = start_userspace(stack);
+
+ if((cur_mm != NULL) && (cur_mm != &init_mm))
+ mm_id->u.pid = copy_context_skas0(stack,
+ cur_mm_id->u.pid);
+ else mm_id->u.pid = start_userspace(stack);
}
return 0;