linux-kernel - [RESEND PATCH v3 3/3] dma-buf: add show

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190610235201.145457-4-fengc@google.com>
Date:   Mon, 10 Jun 2019 16:52:01 -0700
From:   Chenbo Feng <fengc@...gle.com>
To:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        --validate@...gle.com
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>, kernel-team@...roid.com
Subject: [RESEND PATCH v3 3/3] dma-buf: add show_fdinfo handler

From: Greg Hackmann <ghackmann@...gle.com>

The show_fdinfo handler exports the same information available through
debugfs on a per-buffer basis.

Signed-off-by: Greg Hackmann <ghackmann@...gle.com>
Signed-off-by: Chenbo Feng <fengc@...gle.com>
---
 drivers/dma-buf/dma-buf.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index c1da5f9ce44d..c4efc272fc34 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -381,6 +381,20 @@ static long dma_buf_ioctl(struct file *file,
 	}
 }
 
+static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file)
+{
+	struct dma_buf *dmabuf = file->private_data;
+
+	seq_printf(m, "size:\t%zu\n", dmabuf->size);
+	/* Don't count the temporary reference taken inside procfs seq_show */
+	seq_printf(m, "count:\t%ld\n", file_count(dmabuf->file) - 1);
+	seq_printf(m, "exp_name:\t%s\n", dmabuf->exp_name);
+	mutex_lock(&dmabuf->lock);
+	if (dmabuf->name)
+		seq_printf(m, "name:\t%s\n", dmabuf->name);
+	mutex_unlock(&dmabuf->lock);
+}
+
 static const struct file_operations dma_buf_fops = {
 	.release	= dma_buf_release,
 	.mmap		= dma_buf_mmap_internal,
@@ -390,6 +404,7 @@ static const struct file_operations dma_buf_fops = {
 #ifdef CONFIG_COMPAT
 	.compat_ioctl	= dma_buf_ioctl,
 #endif
+	.show_fdinfo	= dma_buf_show_fdinfo,
 };
 
 /*
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog