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[PATCH] uclinux: add NULL check, 0 end valid check and some more exports to nommu.c

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Move call to get_mm_counter() in update_mem_hiwater() to be
inside the check for tsk->mm being null. Otherwise you can be
following a null pointer here. This patch submitted by
Javier Herrero <jherrero@hvsistemas.es>.

Modify the end check for munmap regions to allow for the
legacy behavior of 0 being valid. Pretty much all current
uClinux system libc malloc's pass in 0 as the end point.
A hard check will fail on these, so change the check so
that if it is non-zero it must be valid otherwise it fails.
A passed in value will always succeed (as it used too).

Also export a few more mm system functions - to be consistent
with the VM code exports.

Signed-off-by: Greg Ungerer <gerg@uclinux.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Greg Ungerer 2005-09-12 11:18:10 +10:00 committed by Linus Torvalds
parent 966cdb2fdf
commit 66aa2b4b1c
1 changed files with 13 additions and 4 deletions
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17
mm/nommu.c
View file

@ -57,6 +57,11 @@ DECLARE_RWSEM(nommu_vma_sem);
struct vm_operations_struct generic_file_vm_ops = {
};
EXPORT_SYMBOL(vmalloc);
EXPORT_SYMBOL(vfree);
EXPORT_SYMBOL(vmalloc_to_page);
EXPORT_SYMBOL(vmalloc_32);
/*
* Handle all mappings that got truncated by a "truncate()"
* system call.
@ -142,6 +147,8 @@ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
return(i);
}
EXPORT_SYMBOL(get_user_pages);
DEFINE_RWLOCK(vmlist_lock);
struct vm_struct *vmlist;
@ -852,7 +859,7 @@ unsigned long do_mmap_pgoff(struct file *file,
error_getting_vma:
up_write(&nommu_vma_sem);
kfree(vml);
printk("Allocation of vml for %lu byte allocation from process %d failed\n",
printk("Allocation of vma for %lu byte allocation from process %d failed\n",
len, current->pid);
show_free_areas();
return -ENOMEM;
@ -909,7 +916,7 @@ int do_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
for (parent = &mm->context.vmlist; *parent; parent = &(*parent)->next)
if ((*parent)->vma->vm_start == addr &&
(*parent)->vma->vm_end == end)
((len == 0) || ((*parent)->vma->vm_end == end)))
goto found;
printk("munmap of non-mmaped memory by process %d (%s): %p\n",
@ -1054,7 +1061,8 @@ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr)
int remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
unsigned long to, unsigned long size, pgprot_t prot)
{
return -EPERM;
vma->vm_start = vma->vm_pgoff << PAGE_SHIFT;
return 0;
}
void swap_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
@ -1073,9 +1081,10 @@ void arch_unmap_area(struct mm_struct *mm, unsigned long addr)
void update_mem_hiwater(struct task_struct *tsk)
{
unsigned long rss = get_mm_counter(tsk->mm, rss);
unsigned long rss;
if (likely(tsk->mm)) {
rss = get_mm_counter(tsk->mm, rss);
if (tsk->mm->hiwater_rss < rss)
tsk->mm->hiwater_rss = rss;
if (tsk->mm->hiwater_vm < tsk->mm->total_vm)