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mm: remove the now-unnecessary mmget_still_valid() hack

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The preceding patches have ensured that core dumping properly takes the
mmap_lock.  Thanks to that, we can now remove mmget_still_valid() and all
its users.

Signed-off-by: Jann Horn <jannh@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "Eric W . Biederman" <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Link: http://lkml.kernel.org/r/20200827114932.3572699-8-jannh@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jann Horn
2020-10-15 20:13:00 -07:00
committed by Linus Torvalds
parent 7f3bfab52c
commit 4d45e75a99
8 changed files with 32 additions and 110 deletions
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5
mm/mmap.c
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@@ -2562,7 +2562,7 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
if (vma && (vma->vm_start <= addr))
return vma;
/* don't alter vm_end if the coredump is running */
if (!prev || !mmget_still_valid(mm) || expand_stack(prev, addr))
if (!prev || expand_stack(prev, addr))
return NULL;
if (prev->vm_flags & VM_LOCKED)
populate_vma_page_range(prev, addr, prev->vm_end, NULL);
@@ -2588,9 +2588,6 @@ find_extend_vma(struct mm_struct *mm, unsigned long addr)
return vma;
if (!(vma->vm_flags & VM_GROWSDOWN))
return NULL;
/* don't alter vm_start if the coredump is running */
if (!mmget_still_valid(mm))
return NULL;
start = vma->vm_start;
if (expand_stack(vma, addr))
return NULL;