The patch titled
uml: stop specially protecting kernel stacks
has been added to the -mm tree. Its filename is
uml-stop-specially-protecting-kernel-stacks.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: uml: stop specially protecting kernel stacks
From: Jeff Dike <jdike@xxxxxxxxxxx>
Map all of physical memory as executable to avoid having to change stack
protections during fork and exit.
unprotect_stack is now called only from MODE_TT code, so it is marked as such.
Signed-off-by: Jeff Dike <jdike@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/um/include/kern_util.h | 2 ++
arch/um/kernel/init_task.c | 2 ++
arch/um/kernel/physmem.c | 2 +-
arch/um/kernel/process.c | 5 ++---
4 files changed, 7 insertions(+), 4 deletions(-)
diff -puN arch/um/include/kern_util.h~uml-stop-specially-protecting-kernel-stacks arch/um/include/kern_util.h
--- a/arch/um/include/kern_util.h~uml-stop-specially-protecting-kernel-stacks
+++ a/arch/um/include/kern_util.h
@@ -82,7 +82,9 @@ extern void check_stack_overflow(void *p
extern void relay_signal(int sig, union uml_pt_regs *regs);
extern int user_context(unsigned long sp);
extern void timer_irq(union uml_pt_regs *regs);
+#ifdef CONFIG_MODE_TT
extern void unprotect_stack(unsigned long stack);
+#endif
extern void do_uml_exitcalls(void);
extern int attach_debugger(int idle_pid, int pid, int stop);
extern int config_gdb(char *str);
diff -puN arch/um/kernel/init_task.c~uml-stop-specially-protecting-kernel-stacks arch/um/kernel/init_task.c
--- a/arch/um/kernel/init_task.c~uml-stop-specially-protecting-kernel-stacks
+++ a/arch/um/kernel/init_task.c
@@ -47,7 +47,9 @@ union thread_union cpu0_irqstack
__attribute__((__section__(".data.init_irqstack"))) =
{ INIT_THREAD_INFO(init_task) };
+#ifdef CONFIG_MODE_TT
void unprotect_stack(unsigned long stack)
{
os_protect_memory((void *) stack, THREAD_SIZE, 1, 1, 0);
}
+#endif
diff -puN arch/um/kernel/physmem.c~uml-stop-specially-protecting-kernel-stacks arch/um/kernel/physmem.c
--- a/arch/um/kernel/physmem.c~uml-stop-specially-protecting-kernel-stacks
+++ a/arch/um/kernel/physmem.c
@@ -105,7 +105,7 @@ void __init setup_physmem(unsigned long
offset = uml_reserved - uml_physmem;
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
- len - offset, 1, 1, 0);
+ len - offset, 1, 1, 1);
if(err < 0){
os_print_error(err, "Mapping memory");
exit(1);
diff -puN arch/um/kernel/process.c~uml-stop-specially-protecting-kernel-stacks arch/um/kernel/process.c
--- a/arch/um/kernel/process.c~uml-stop-specially-protecting-kernel-stacks
+++ a/arch/um/kernel/process.c
@@ -82,9 +82,9 @@ unsigned long alloc_stack(int order, int
if (atomic)
flags = GFP_ATOMIC;
page = __get_free_pages(flags, order);
- if(page == 0)
+ if (page == 0)
return 0;
- stack_protections(page);
+
return page;
}
@@ -141,7 +141,6 @@ void release_thread(struct task_struct *
void exit_thread(void)
{
- unprotect_stack((unsigned long) current_thread);
}
void *get_current(void)
_
Patches currently in -mm which might be from jdike@xxxxxxxxxxx are
git-kvm.patch
hostfs-convert-to-new-aops.patch
uml-move-userspace-code-to-userspace-file.patch
uml-tidy-recently-moved-code.patch
uml-fix-error-cleanup-ordering.patch
uml-console-subsystem-tidying.patch
uml-fix-console-writing-bugs.patch
uml-console-tidying.patch
uml-stop-using-libc-asm-pageh.patch
uml-fix-an-ipv6-libc-vs-kernel-symbol-clash.patch
uml-fix-nonremovability-of-watchdog.patch
uml-stop-specially-protecting-kernel-stacks.patch
uml-stop-saving-process-fp-state.patch
uml-physmem-code-tidying.patch
-
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