Re: [PATCH 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared memory

From: David Howells
Date: Fri Feb 16 2007 - 10:06:25 EST

Kawai, Hidehiro <hidehiro.kawai.ez@xxxxxxxxxxx> wrote:

> static int elf_fdpic_dump_segments(struct file *file, struct mm_struct *mm,
> - size_t *size, unsigned long *limit)
> + size_t *size, unsigned long *limit,
> + unsigned int omit_anon_shared)

Why are you passing it as an extra argument when you could just use
mm->coredump_omit_anon_shared here:

> + if (!maydump(vma, omit_anon_shared))

And here:

> + phdr.p_filesz = maydump(vma, omit_anon_shared) ? sz : 0;

Actually, I think I would just pass the mm pointer you have into maydump() and
let that dereference it here:

> + if (omit_anon_shared) {

which would then be:

if (mm->coredump_omit_anon_shared) {

Then the calls to maydump() would be:

if (!maydump(vma, mm))


phdr.p_filesz = maydump(vma, current->mm) ? sz : 0;

I wouldn't worry, were I you, about the setting changing whilst it's being
used. If you are worried about that, you can probably do some locking against

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