From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793440302; b=n0+HG8k9Bwhy4RN05yHHhU/je300BJXbym4GHcYVzX+2ZjcQoJXzp03TSbgXkRqDiijW mRQBVgn/RBgrMoLPy2IeMorgfpiD3x8anHo4sj9wa0QEXkIWrjY3JUn2Svpb7hy7yBIfr KYqJQgA6jbmqVkjSiwwn+/xGKAcva4P1hGSmw5PY5kwX7QYhLuMWYX0ipFZrUMq3WA/wO Y1zsqeAuQ8uyNmIThs6Tb3A+aY6que6zfGar934Y1ddJscVgP5xzqRJ1fuFyGkZcN0Nap 2YjCtP5EiCC/e+xCVTEn9AyCAz78sk/iOGsZSDvQRyccSGuaHeoPEiwky2MqxL5M/zw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793440302; h=Received:DKIM-Signature:From:Date:Subject:MIME-Version:Content-Type: Content-Transfer-Encoding:Message-Id:References:In-Reply-To:To:Cc: X-Mailer:X-Developer-Signature:X-Developer-Key; bh=/pp7BZen6g6ZjSOvHMxJEmd8Vj24oFI7u7jvugD7NkE=; b=wUsmBVXiha0WIpbgYvE6LNWIX/vFr+isJPYKQ1hfUBARg4zD80XO6D76Gvu7bQMPYMwj RNQ6VCMFPjC2VELawMdddFoDv+3sIoJORnMWBrbSgefJJdSOrbUYQi/Nuj8IlNbuIJXxP BiLPWpQTZGpl9F/yFa+2hu/ZEH5tevPwgFLIBRXAHYAvdPVy2hqMUzzyPy+8r5KhP6KLB F9bv29Mkg5IyFXcBMLYPEk+zaDBJwfHLJ2JWOZeEExArL1YlAohQNKmafDyMgKzX0IZ3U waQYzOleCccSRc2of0CKh6klOHFlYXKdXJPiBoMf2hsnyPwaebHkt7CzsMlZ2wmurqQ== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=TJMD5efz; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 532D9606A31A; Sat, 31 Oct 2026 09:51:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=TJMD5efz Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6853F1F00919; Sat, 31 Oct 2026 09:51:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793440302; bh=/pp7BZen6g6ZjSOvHMxJEmd8Vj24oFI7u7jvugD7NkE=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=TJMD5efzjo4MGr3Uznn4+DxGJ2LTsbfx/ixDORmcgblTHIc68BYMwsNK6C6VWarFo VfGxg4J667C0pUzinEZwWnLhOacuZCEJq2ulYqBUnj90/yzWCfZHwxpSUiv+LhkUiG 2g+RQFhd0JaIpZDnVyTCNCRiqXE+WZm+2RQpFaDQFuZ1Dce2O0g8gW1CyyXRvHw9ir /HwHDBTfRFw4DkC+sW/RAKJJEwJNZmhRHjRY+XKqD2hoRW3BP9261rOH7GeSD2JvM8 +qDHXnKc4uHO1cLUJhbjLE+cMq8WjoOTsw+9Y0WcbG28rxC/xGwj3mDwdrQ65IPoc+ LKTDSrnbIvsuA== From: "David Hildenbrand (Arm)" Date: Sat, 31 Oct 2026 10:40:13 +0100 Subject: [PATCH v3 44/47] mm/vma: don't leak the charge for stack growth X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261031-fixes_core-v3-44-d6437171ecc3@kernel.org> References: <20261031-fixes_core-v3-0-d6437171ecc3@kernel.org> In-Reply-To: <20261031-fixes_core-v3-0-d6437171ecc3@kernel.org> To: Andrew Morton , Johannes Weiner , Michal Hocko , Qi Zheng , Shakeel Butt , Lorenzo Stoakes , Kairui Song , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kees Cook , Peter Zijlstra , Jann Horn , Pedro Falcato , Hugh Dickins , Pasha Tatashin , Pratyush Yadav , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Lance Yang , Rik van Riel , Harry Yoo , Alistair Popple , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl Shutsemau , Matthew Brost , John Hubbard , Peter Xu , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Oscar Salvador , Minchan Kim , Muchun Song , Xu Xin , Chengming Zhou , Chris Li , Kemeng Shi , Nhat Pham , Youngjun Park , Gregory Price , Joshua Hahn , Rakie Kim , Ying Huang , Jason Gunthorpe Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, stable@vger.kernel.org, Josef Bacik , Muhammad Usama Anjum , "David Hildenbrand (Arm)" X-Mailer: b4 0.16.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1343; i=david@kernel.org; h=from:subject:message-id; bh=8bDRWBq3PVps+Kl5GQHMx97Trak1vEreOi5AJf6aDXw=; b=owGbwMvMwCF2/OVpCdfQ3ZWMp9WSGLKebs+e6Fb6o77Y2kyxI9fh098PPTsYn8Ve/y33csXEs 1FH51kpdJSyMIhxMMiKKbIEBd83ePlyXW21Gx8zzBxWJpAhDFycAjCRGAVGhj3r1iW0ddxJ5Ax4 szRZOe4ld4W8pr/US231ved7Wr4ozmdk6PnH0vQldb1U8doXllndroefxJw0c2G/8qFHUoSLde8 CJgA= X-Developer-Key: i=david@kernel.org; a=openpgp; fpr=1BD9CAAD735C4C3A460DFCCA4DDE10F700FF835A 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@vger.kernel.org Reported-by: Josef Bacik Reviewed-by: Lorenzo Stoakes (ARM) Reviewed-by: Pedro Falcato Reviewed-by: Harry Yoo (Meta) Tested-by: Muhammad Usama Anjum Signed-off-by: David Hildenbrand (Arm) --- mm/vma.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/vma.c b/mm/vma.c index acdf00346cda5..695d0be85ac86 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -3391,7 +3391,8 @@ static int acct_stack_growth(struct vm_area_struct *vma, * Overcommit.. This must be the final test, as it will * update security statistics. */ - if (security_vm_enough_memory_mm(mm, grow)) + if (vma_test(vma, VMA_ACCOUNT_BIT) && + security_vm_enough_memory_mm(mm, grow)) return -ENOMEM; return 0; -- 2.43.0