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| author | Hugh Dickins <hugh@veritas.com> | 2005-11-21 21:32:12 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-22 09:13:42 -0800 |
| commit | 83e9b7e929d1323b9a155d186f77aa8c06155cc3 (patch) | |
| tree | 3cad39e867ca337b08bc4a7309c2b17787abd527 /mm/mprotect.c | |
| parent | ed5297a94090d9a9f27b0ce1f9601ebe73561cff (diff) | |
| download | lwn-83e9b7e929d1323b9a155d186f77aa8c06155cc3.tar.gz lwn-83e9b7e929d1323b9a155d186f77aa8c06155cc3.zip | |
[PATCH] unpaged: private write VM_RESERVED
The PageReserved removal in 2.6.15-rc1 issued a "deprecated" message when you
tried to mmap or mprotect MAP_PRIVATE PROT_WRITE a VM_RESERVED, and failed
with -EACCES: because do_wp_page lacks the refinement to COW pages in those
areas, nor do we expect to find anonymous pages in them; and it seemed just
bloat to add code for handling such a peculiar case. But immediately it
caused vbetool and ddcprobe (using lrmi) to fail.
So revert the "deprecated" messages, letting mmap and mprotect succeed. But
leave do_wp_page's BUG_ON(vma->vm_flags & VM_RESERVED) in place until we've
added the code to do it right: so this particular patch is only good if the
app doesn't really need to write to that private area.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/mprotect.c')
| -rw-r--r-- | mm/mprotect.c | 8 |
1 files changed, 0 insertions, 8 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index 17a2b52b753b..653b8571c1ed 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -124,14 +124,6 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev, * a MAP_NORESERVE private mapping to writable will now reserve. */ if (newflags & VM_WRITE) { - if (oldflags & VM_RESERVED) { - BUG_ON(oldflags & VM_WRITE); - printk(KERN_WARNING "program %s is using MAP_PRIVATE, " - "PROT_WRITE mprotect of VM_RESERVED memory, " - "which is deprecated. Please report this to " - "linux-kernel@vger.kernel.org\n",current->comm); - return -EACCES; - } if (!(oldflags & (VM_ACCOUNT|VM_WRITE|VM_SHARED|VM_HUGETLB))) { charged = nrpages; if (security_vm_enough_memory(charged)) |