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 T8eZrGtt 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Howlett wrote: > From: "Liam R. Howlett" > > There have been no reported infinite loops in the tree, but checking the > detection of an infinite loop during validation is simple enough. Add > the detection to the validate_mm() function so that error reports are > clear and don't just report stalls. > > This does not protect against internal maple tree issues, but it does > detect too many vmas being returned from the tree. > > The variance of +10 is to allow for the debugging output to be more useful for > nearly correct counts. In the event of more than 10 over the map_count, the > count will be set to -1 for easier identification of a potential infinite loop. > > Note that the mmap lock is held to ensure a consistent tree state during the > validation process. > > Signed-off-by: Liam R. Howlett Reviewed-by: Lorenzo Stoakes > Cc: Lorenzo Stoakes > Cc: Vlastimil Babka > Cc: Jann Horn > --- > mm/vma.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/mm/vma.c b/mm/vma.c > index 68138e8c153e..283e6bc4884f 100644 > --- a/mm/vma.c > +++ b/mm/vma.c > @@ -615,7 +615,10 @@ void validate_mm(struct mm_struct *mm) > anon_vma_unlock_read(anon_vma); > } > #endif > - i++; > + if (++i > mm->map_count + 10) { > + i = -1; > + break; > + } > } > if (i != mm->map_count) { > pr_emerg("map_count %d vma iterator %d\n", mm->map_count, i); > -- > 2.43.0 >