2.6.23-stable review patch. If anyone has any objections, please let us know.
------------------
From: Eric Paris <[EMAIL PROTECTED]>
patch ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5 in mainline.
VM/Security: add security hook to do_brk
Given a specifically crafted binary do_brk() can be used to get low pages
available in userspace virtual memory and can thus be used to circumvent
the mmap_min_addr low memory protection. Add security checks in do_brk().
Signed-off-by: Eric Paris <[EMAIL PROTECTED]>
Acked-by: Alan Cox <[EMAIL PROTECTED]>
Cc: Stephen Smalley <[EMAIL PROTECTED]>
Cc: James Morris <[EMAIL PROTECTED]>
Cc: Chris Wright <[EMAIL PROTECTED]>
Cc: maximilian attems <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
mm/mmap.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1938,6 +1938,10 @@ unsigned long do_brk(unsigned long addr,
if (is_hugepage_only_range(mm, addr, len))
return -EINVAL;
+ error = security_file_mmap(0, 0, 0, 0, addr, 1);
+ if (error)
+ return error;
+
flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
error = arch_mmap_check(addr, len, flags);
--
--
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