linux-kernel - [PATCH] staging: android: ashmem: add size field in procfs fdinfo

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Message-Id: <20210618095035.32410-1-liuhailong@oppo.com>
Date:   Fri, 18 Jun 2021 17:50:35 +0800
From:   liuhailong <liuhailong@...o.com>
To:     gregkh@...uxfoundation.org, arve@...roid.com, tkjos@...roid.com,
        maco@...roid.com, joel@...lfernandes.org, christian@...uner.io,
        hridya@...gle.com, surenb@...gle.com
Cc:     linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        liuhailong <liuhailong@...o.com>
Subject: [PATCH] staging: android: ashmem: add size field in procfs fdinfo

add this information to help user to find ashmem problem.

ashmem leak scenario:
-000|fd = ashmem_create_region
-001|mmap and pagefault
-002|munmap
-003|forget close(fd) <---- which lead to ashmem leak

Signed-off-by: liuhailong <liuhailong@...o.com>
---
 drivers/staging/android/ashmem.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index d66a64e42273..ee2fd75111d8 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -894,6 +894,8 @@ static void ashmem_show_fdinfo(struct seq_file *m, struct file *file)
 		seq_printf(m, "name:\t%s\n",
 			   asma->name + ASHMEM_NAME_PREFIX_LEN);
 
+	seq_printf(m, "size:\t%zu\n", asma->size);
+
 	mutex_unlock(&ashmem_mutex);
 }
 #endif
-- 
2.30.2