From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF746C43331 for ; Mon, 11 Nov 2019 20:38:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C44212173B for ; Mon, 11 Nov 2019 20:38:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727722AbfKKUiw (ORCPT ); Mon, 11 Nov 2019 15:38:52 -0500 Received: from mout.kundenserver.de ([212.227.126.130]:52845 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727718AbfKKUiv (ORCPT ); Mon, 11 Nov 2019 15:38:51 -0500 Received: from threadripper.lan ([149.172.19.189]) by mrelayeu.kundenserver.de (mreue012 [212.227.15.129]) with ESMTPA (Nemesis) id 1MG90u-1igQ4y2wgu-00Gc36; Mon, 11 Nov 2019 21:38:40 +0100 From: Arnd Bergmann To: Mauro Carvalho Chehab , linux-media@vger.kernel.org Cc: Hans Verkuil , linux-kernel@vger.kernel.org, y2038@lists.linaro.org, Arnd Bergmann Subject: [PATCH v4 7/8] media: v4l2-core: fix compat VIDIOC_DQEVENT for time64 ABI Date: Mon, 11 Nov 2019 21:38:34 +0100 Message-Id: <20191111203835.2260382-8-arnd@arndb.de> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20191111203835.2260382-1-arnd@arndb.de> References: <20191111203835.2260382-1-arnd@arndb.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Provags-ID: V03:K1:dKK7xsILnKx0fQ4qyv2gvUd49B8SRdhukArWLoHaYtCAGNHYgF4 7s2f/9aw5odplOHsmuwHTniyBsDUEulNbO7hbiWtiNh7P4sDbRUAvSK1MJw/ddnM0uXfzdE Esf4w9zJzAn+9NaUiJ5kE6U2ipuGgPzEHxR0pUMfgw/wo8eLtTMhKSgz6X/ZCIshXHLfeRi K23lQR5zzBRA5AZf87eIQ== X-UI-Out-Filterresults: notjunk:1;V03:K0:oXaK/44Wfxs=:2IWGOHBaSUHKHIxzZPkEUO Ypqrr6U8XRGBh7hsE5uPxQWvmndZe7kpWbk0rGfV14yrt1uqUqutabklUGBIBgCiZN8SLw9hv zv8asQmuADofatvSZ6WhDaUbWwc1a/+6Fd7ZoCTtT8YIgOQxQ2Qz0fyG3lLSHHCTIH4nOlqD3 YT29y+DLmoDatDI5+CEyouJjLhh92htLYetqr2hO/FE4pmUUyaYl4vxTTyCUr+Tu5Yyx86Aej 9GL8yIcobCn7dK++HXBV35DnQiM55gh7kGMGW2r49hvx0P7T3LFIfZrTl58hznPuM65OO7ckL J7rGGlxeWM1zNHOcUUlVEgyxycisfn++enkCB4QXTdvGGUppNF2PJlubi9e1VLw8kI2LydxOV KBUr/AXGi1zTWmWQKdmpQeUEpnBVxfAkhgxxiaIm9pfpcuyYMOz33EQPyx0mmLPglMtOmXgxZ 2rxHMSLu3QOeWwPiQJBmE5zWHRkiI1PjvKn/F1sOdfN/NHzZMUuqMA8oDQmPkoqYjpWJ+RuTp qFispWjzbysJO+fxm9i/ydPk2IOmq/G2hOLJ0N2/z7KWqShVZaMEsAVvAVanrLPZfH5932lMH ETs0h5R0F4fuDLGmiahR8xD0PXebzrTm5eo8RvdcAAqMipco2FzUaPp7wdzB0ZeoE75pyCg+/ ri66KVQjbvZORpFETsh5IFBNx3rZ07/d2lVEMKyMy8VxyeZN2EF8KohoHDMMRB2JbEQaOLCuc gnESR34GhdZknorp4imLOj1+15ck2FEhPpbFfnIUnruJJ0FD/ABUpp0EVZVB+HCXcHCXirvD7 1MmEVYIMuX1TuCFQ3qXMkSrBIhVw3QD+gTDq9EHXU4uCWihBmVCKw/JSa5MCVYYu+C6AtYql9 Bps4ue7HbnstxAzLdCtA== Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The native code supports the variant of struct v4l2_event for 64-bit time_t, so add the compat version as well. Here, a new incompatibility arises: while almost all 32-bit architectures now use the same layout as 64-bit architectures and the commands can simply be passed through, on x86 the internal alignment of v4l2_event is different because of the 64-bit member in v4l2_event_ctrl. To handle all architectures, this now requires defining four different versions of the structure to cover all possible combinations. The compat handling for VIDIOC_DQEVENT32 and VIDIOC_DQEVENT32_TIME32 is now inside of an #ifdef so it does not get used on architectures other than x86. Signed-off-by: Arnd Bergmann --- drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 57 ++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c index 7ad6db8dd9f6..46cd84879c1f 100644 --- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c +++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c @@ -1028,6 +1028,15 @@ static int put_v4l2_ext_controls32(struct file *file, return 0; } +#ifdef CONFIG_X86_64 +/* + * x86 is the only compat architecture with different struct alignment + * between 32-bit and 64-bit tasks. + * + * On all other architectures, v4l2_event32 and v4l2_event32_time32 are + * the same as v4l2_event and v4l2_event_time32, so we can use the native + * handlers, converting v4l2_event to v4l2_event_time32 if necessary. + */ struct v4l2_event32 { __u32 type; union { @@ -1036,7 +1045,20 @@ struct v4l2_event32 { } u; __u32 pending; __u32 sequence; - struct compat_timespec timestamp; + struct __kernel_timespec timestamp; + __u32 id; + __u32 reserved[8]; +}; + +struct v4l2_event32_time32 { + __u32 type; + union { + compat_s64 value64; + __u8 data[64]; + } u; + __u32 pending; + __u32 sequence; + struct old_timespec32 timestamp; __u32 id; __u32 reserved[8]; }; @@ -1057,6 +1079,23 @@ static int put_v4l2_event32(struct v4l2_event __user *p64, return 0; } +static int put_v4l2_event32_time32(struct v4l2_event_time32 __user *p64, + struct v4l2_event32_time32 __user *p32) +{ + if (!access_ok(p32, sizeof(*p32)) || + assign_in_user(&p32->type, &p64->type) || + copy_in_user(&p32->u, &p64->u, sizeof(p64->u)) || + assign_in_user(&p32->pending, &p64->pending) || + assign_in_user(&p32->sequence, &p64->sequence) || + assign_in_user(&p32->timestamp.tv_sec, &p64->timestamp.tv_sec) || + assign_in_user(&p32->timestamp.tv_nsec, &p64->timestamp.tv_nsec) || + assign_in_user(&p32->id, &p64->id) || + copy_in_user(p32->reserved, p64->reserved, sizeof(p32->reserved))) + return -EFAULT; + return 0; +} +#endif + struct v4l2_edid32 { __u32 pad; __u32 start_block; @@ -1121,6 +1160,7 @@ static int put_v4l2_edid32(struct v4l2_edid __user *p64, #define VIDIOC_S_EXT_CTRLS32 _IOWR('V', 72, struct v4l2_ext_controls32) #define VIDIOC_TRY_EXT_CTRLS32 _IOWR('V', 73, struct v4l2_ext_controls32) #define VIDIOC_DQEVENT32 _IOR ('V', 89, struct v4l2_event32) +#define VIDIOC_DQEVENT32_TIME32 _IOR ('V', 89, struct v4l2_event32_time32) #define VIDIOC_CREATE_BUFS32 _IOWR('V', 92, struct v4l2_create_buffers32) #define VIDIOC_PREPARE_BUF32 _IOWR('V', 93, struct v4l2_buffer32) @@ -1202,7 +1242,10 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar case VIDIOC_G_EXT_CTRLS32: ncmd = VIDIOC_G_EXT_CTRLS; break; case VIDIOC_S_EXT_CTRLS32: ncmd = VIDIOC_S_EXT_CTRLS; break; case VIDIOC_TRY_EXT_CTRLS32: ncmd = VIDIOC_TRY_EXT_CTRLS; break; +#ifdef CONFIG_X86_64 case VIDIOC_DQEVENT32: ncmd = VIDIOC_DQEVENT; break; + case VIDIOC_DQEVENT32_TIME32: ncmd = VIDIOC_DQEVENT_TIME32; break; +#endif case VIDIOC_OVERLAY32: ncmd = VIDIOC_OVERLAY; break; case VIDIOC_STREAMON32: ncmd = VIDIOC_STREAMON; break; case VIDIOC_STREAMOFF32: ncmd = VIDIOC_STREAMOFF; break; @@ -1336,10 +1379,16 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar } compatible_arg = 0; break; +#ifdef CONFIG_X86_64 case VIDIOC_DQEVENT32: err = alloc_userspace(sizeof(struct v4l2_event), 0, &new_p64); compatible_arg = 0; break; + case VIDIOC_DQEVENT32_TIME32: + err = alloc_userspace(sizeof(struct v4l2_event_time32), 0, &new_p64); + compatible_arg = 0; + break; +#endif } if (err) return err; @@ -1404,10 +1453,16 @@ static long do_video_ioctl(struct file *file, unsigned int cmd, unsigned long ar err = put_v4l2_framebuffer32(new_p64, p32); break; +#ifdef CONFIG_X86_64 case VIDIOC_DQEVENT32: err = put_v4l2_event32(new_p64, p32); break; + case VIDIOC_DQEVENT32_TIME32: + err = put_v4l2_event32_time32(new_p64, p32); + break; +#endif + case VIDIOC_G_EDID32: err = put_v4l2_edid32(new_p64, p32); break; -- 2.20.0