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AJvYcCUM0kS0/Opp9v1+SL4TKNJAmu3kbtHXXX99ocG4m/IESORz8srWUkaRyfMXLTkBEFBkLptINg1jg3D/cuY=@vger.kernel.org X-Gm-Message-State: AOJu0YxpTUMSmcQAFi969zIdzYItnMfE6B1wQZRnMSohIRp23xAqcO3n 5jygQBlBiYDgWGn9AZ48XSXvp5Smsvms6dMvwP0dkPNbwpknrHAU+c2wJIr9z0xKK1ZC9zhxiGt ylA== X-Google-Smtp-Source: AGHT+IF9Nz4fP8YCDWuEvv8HenQUzivi17wIWFTDjOw79pIi9puAuyZi3edh0rN76x0eDFYowMyrfvXvJ/c= X-Received: from pgiz13.prod.google.com ([2002:a63:c04d:0:b0:7fd:585b:babf]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:c88e:b0:1e0:f495:1bd9 with SMTP id adf61e73a8af0-1e45ab17a26mr1379210637.8.1734377086086; Mon, 16 Dec 2024 11:24:46 -0800 (PST) Date: Mon, 16 Dec 2024 11:24:14 -0800 In-Reply-To: <20241216192419.2970941-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241216192419.2970941-1-surenb@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241216192419.2970941-12-surenb@google.com> Subject: [PATCH v6 11/16] mm: enforce vma to be in detached state before freeing From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: peterz@infradead.org, willy@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mjguzik@gmail.com, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, lokeshgidra@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, klarasmodin@gmail.com, corbet@lwn.net, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com, surenb@google.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" exit_mmap() frees vmas without detaching them. This will become a problem when we introduce vma reuse. Ensure that vmas are always detached before being freed. Signed-off-by: Suren Baghdasaryan --- kernel/fork.c | 4 ++++ mm/vma.c | 10 ++++++++-- 2 files changed, 12 insertions(+), 2 deletions(-) diff --git a/kernel/fork.c b/kernel/fork.c index 283909d082cb..f1ddfc7b3b48 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -473,6 +473,10 @@ struct vm_area_struct *vm_area_dup(struct vm_area_stru= ct *orig) =20 void __vm_area_free(struct vm_area_struct *vma) { +#ifdef CONFIG_PER_VMA_LOCK + /* The vma should be detached while being destroyed. */ + VM_BUG_ON_VMA(!is_vma_detached(vma), vma); +#endif vma_numab_state_free(vma); free_anon_vma_name(vma); kmem_cache_free(vm_area_cachep, vma); diff --git a/mm/vma.c b/mm/vma.c index fbd7254517d6..0436a7d21e01 100644 --- a/mm/vma.c +++ b/mm/vma.c @@ -413,9 +413,15 @@ void remove_vma(struct vm_area_struct *vma, bool unrea= chable) if (vma->vm_file) fput(vma->vm_file); mpol_put(vma_policy(vma)); - if (unreachable) + if (unreachable) { +#ifdef CONFIG_PER_VMA_LOCK + if (!is_vma_detached(vma)) { + vma_start_write(vma); + vma_mark_detached(vma); + } +#endif __vm_area_free(vma); - else + } else vm_area_free(vma); } =20 --=20 2.47.1.613.gc27f4b7a9f-goog