[PATCH] RLIMIT_MEMLOCK checking fix
Always use page counts when doing RLIMIT_MEMLOCK checking to avoid possible overflow. Signed-off-by: Chris Wright <chrisw@osdl.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Родитель
edfbe2b003
Коммит
93ea1d0a12
10
mm/mmap.c
10
mm/mmap.c
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@ -937,9 +937,10 @@ unsigned long do_mmap_pgoff(struct file * file, unsigned long addr,
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/* mlock MCL_FUTURE? */
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if (vm_flags & VM_LOCKED) {
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unsigned long locked, lock_limit;
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locked = mm->locked_vm << PAGE_SHIFT;
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locked = len >> PAGE_SHIFT;
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locked += mm->locked_vm;
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lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
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locked += len;
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lock_limit >>= PAGE_SHIFT;
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if (locked > lock_limit && !capable(CAP_IPC_LOCK))
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return -EAGAIN;
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}
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@ -1822,9 +1823,10 @@ unsigned long do_brk(unsigned long addr, unsigned long len)
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*/
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if (mm->def_flags & VM_LOCKED) {
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unsigned long locked, lock_limit;
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locked = mm->locked_vm << PAGE_SHIFT;
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locked = len >> PAGE_SHIFT;
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locked += mm->locked_vm;
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lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
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locked += len;
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lock_limit >>= PAGE_SHIFT;
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if (locked > lock_limit && !capable(CAP_IPC_LOCK))
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return -EAGAIN;
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}
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