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author | Greg Ungerer <gerg@snapgear.com> | 2005-09-12 11:18:10 +1000 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-11 20:43:47 -0700 |
commit | 66aa2b4b1cf9a61f1550251c56fc6f0d48287591 (patch) | |
tree | b372d102e0f6a8071c2473c84343f7a1a9d4cf94 | |
parent | 966cdb2fdf1776392c98f7d38e0eb9c6dd1c4715 (diff) | |
download | kernel_samsung_smdk4412-66aa2b4b1cf9a61f1550251c56fc6f0d48287591.zip kernel_samsung_smdk4412-66aa2b4b1cf9a61f1550251c56fc6f0d48287591.tar.gz kernel_samsung_smdk4412-66aa2b4b1cf9a61f1550251c56fc6f0d48287591.tar.bz2 |
[PATCH] uclinux: add NULL check, 0 end valid check and some more exports to nommu.c
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>
-rw-r--r-- | mm/nommu.c | 17 |
1 files changed, 13 insertions, 4 deletions
@@ -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) |