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b=JohOz6ytdRDH1JOg7Pkp+FFmv+RWIqpaHsiw/e4pd7zPWPDFs0NGQjWSnuqz6qm39G NAbWlydKHvLC1ZlY306Z9f2xDON8uasTA71QvqZOU3s1L34yfQZCxmfUCXSasmEnWECg 1Ih5L/FcE/q00FLUuZYO8QmRKeaoQxBeD67jiw2lH7auUckk0jucrBXNoQVVuIR4FGbH n3TgXpo2li/Cnur/NcVcfC440rsAvEUNfxYkScV1IXR9I2rC0wCxORRPMQXBzC83pCTW P0T2+P0g3ZtPb8lMYf5Ycscii6RzTxY30tov6nf5iNNPQuHoq8RaBPzqQkoXlWXhUVLG ej3g== X-Forwarded-Encrypted: i=1; AHgh+RrzkpCVif5e6afjabRt1IHpfTRcwfT/mQk5zNypyqWzb1QIUkqxRvWryZn+qyp++m9fDW8AvdfLMQ==@kvack.org X-Gm-Message-State: AOJu0Yw5m/63FX7wM8vO/pbKMibQazaxtlcZJ+xwutI8mX03FrcbjQFf BkN/WOlg0SQ/BcnM9JmvkteOlRj01Ddwg8mSOFYheMG2Urhde/SucQTkKPKl/b8oIpME/7zOATu 1Zs1/Ob1KGw== X-Received: from dyng25.prod.google.com ([2002:a05:7300:7f19:b0:30c:2bdd:dcdf]) (user=jyescas job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:9f09:b0:3c0:9c19:b275 with SMTP id adf61e73a8af0-3c44b2ae3c9mr2165420637.67.1784793026464; Thu, 23 Jul 2026 00:50:26 -0700 (PDT) Date: Thu, 23 Jul 2026 00:47:13 -0700 In-Reply-To: <20260723074854.1013941-1-jyescas@google.com> Mime-Version: 1.0 References: <20260723074854.1013941-1-jyescas@google.com> X-Mailer: git-send-email 2.55.0.229.g6434b31f56-goog Message-ID: <20260723074854.1013941-10-jyescas@google.com> Subject: [RFC PATCH 09/16] mm: Read the nr_pages_allocs value given by user From: Juan Yescas To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , open list , "open list:MEMORY MANAGEMENT - CORE" Cc: jyescas@google.com, android-mm@google.com, fvdl@google.com, tkjos@google.com, minchan@google.com, dskiba@google.com, open list , "open list:MEMORY MANAGEMENT - CORE" Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: 8su46tgihi8myxuh7cfus4ud3raheokt X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: C3EFDC0003 X-Rspam-User: X-HE-Tag: 1784793027-562769 X-HE-Meta: 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 l93BV0y2 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This change reads the nr_page_allocs value given by the user and validates that is an unsigned long. If the input is valid, it will allocate an array of nr_page_allocs size. This array will store the allocation ids. These allocation ids will be used to free the allocations. Signed-off-by: Juan Yescas --- mm/page_alloc_hogger.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/mm/page_alloc_hogger.c b/mm/page_alloc_hogger.c index 3ffad74a0bdf..60dfddf6b441 100644 --- a/mm/page_alloc_hogger.c +++ b/mm/page_alloc_hogger.c @@ -136,6 +136,19 @@ struct kmem_cache *page_alloc_cache; static ssize_t req_page_alloc_write(struct file *file, const char __user *ubuf, size_t cnt, loff_t *ppos) { + unsigned long nr_pages_allocs; + unsigned long *allocs_ids; + int ret; + + ret = kstrtoul_from_user(ubuf, cnt, 10, &nr_pages_allocs); + if (ret) + return ret; + + allocs_ids = kmalloc_array(nr_pages_allocs, sizeof(unsigned long), + GFP_KERNEL); + if (!allocs_ids) + return -ENOMEM; + return cnt; } -- 2.55.0.229.g6434b31f56-goog