linux-kernel - [PATCH 4/4] dma-buf: document fd flags and O

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Mon, 19 Mar 2012 00:34:28 +0100
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	linaro-mm-sig@...ts.linaro.org,
	LKML <linux-kernel@...r.kernel.org>,
	DRI Development <dri-devel@...ts.freedesktop.org>,
	linux-media@...r.kernel.org
Cc:	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [PATCH 4/4] dma-buf: document fd flags and O_CLOEXEC requirement

Otherwise subsystems will get this wrong and end up with and second
export ioctl with the flag and O_CLOEXEC support added.

Signed-Off-by: Daniel Vetter <daniel.vetter@...ll.ch>
---
 Documentation/dma-buf-sharing.txt |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt
index 9f3aeef..087e261 100644
--- a/Documentation/dma-buf-sharing.txt
+++ b/Documentation/dma-buf-sharing.txt
@@ -319,6 +319,11 @@ Miscellaneous notes
 - Any exporters or users of the dma-buf buffer sharing framework must have
   a 'select DMA_SHARED_BUFFER' in their respective Kconfigs.
 
+- To avoid the wrath of userspace library writers exporting subsystems must have
+  a flag parameter in the ioctl that creates the dma-buf fd which needs to
+  support at least the O_CLOEXEC fd flag. This needs to be passed in the flag
+  parameter of dma_buf_export.
+
 References:
 [1] struct dma_buf_ops in include/linux/dma-buf.h
 [2] All interfaces mentioned above defined in include/linux/dma-buf.h
-- 
1.7.7.5

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/