[PATCH 43/46] mm/vma: don't leak the charge for stack growth

[sashiko-bot at kernel.org]

> acct_stack_growth() charges stack expansion even without VM_ACCOUNT.
> This can happen for read-only or MAP_NORESERVE mappings created with
> MAP_GROWSDOWN. Unmapping these VMAs does not release the charge, leaking
> Committed_AS.
> 
> Only check and charge growth for VM_ACCOUNT VMAs, matching mremap().
> Unaccounted growth skips the overcommit check while remaining subject
> to the other stack-growth limits.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Cc: stable at vger.kernel.org
> Reported-by: Josef Bacik <josef at toxicpanda.com>
> Reviewed-by: Lorenzo Stoakes (ARM) <ljs at kernel.org>
> Signed-off-by: David Hildenbrand (Arm) <david at kernel.org>

Sashiko has reviewed this patch and found no issues.

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Sashiko AI review · https://sashiko.dev/#/patchset/20261027-fixes_core-v1-0-6f74bec9a5bb@kernel.org?part=43