[{"id":3682214,"web_url":"http://patchwork.ozlabs.org/comment/3682214/","msgid":"","list_archive_url":null,"date":"2026-04-24T21:41:25","subject":"Re: [PATCH] smb/client: fix unaligned reads in wsl_to_fattr()","submitter":{"id":510,"url":"http://patchwork.ozlabs.org/api/people/510/","name":"Steve French","email":"smfrench@gmail.com"},"content":"Were you able to reproduce this bug with a test?\n\nOn Thu, Apr 23, 2026 at 1:00 AM Youling Tang wrote:\n>\n> From: Youling Tang \n>\n> See MS-FSCC 2.4.16. When multiple FILE_FULL_EA_INFORMATION data elements\n> are present in the buffer, each MUST be aligned on a 4-byte boundary.\n>\n> When parsing WSL extended attributes, the code derives the value pointer\n> at an offset of 7 (SMB2_WSL_XATTR_NAME_LEN + 1) from ea_data, the value\n> sits at an unaligned offset.\n>\n> We should use get_unaligned_le32() or get_unaligned_le64() to get\n> unaligned values.\n>\n> Link: https://lore.kernel.org/linux-cifs/77013349-ff89-4593-985d-520d967d2638@chenxiaosong.com/\n> Signed-off-by: Youling Tang \n> Reviewed-by: ChenXiaoSong \n> ---\n> fs/smb/client/reparse.c | 6 +++---\n> fs/smb/client/reparse.h | 6 +++---\n> fs/smb/client/smb2pdu.h | 1 +\n> 3 files changed, 7 insertions(+), 6 deletions(-)\n>\n> diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c\n> index cd1e1eaee67a..eebce954c5ce 100644\n> --- a/fs/smb/client/reparse.c\n> +++ b/fs/smb/client/reparse.c\n> @@ -1160,7 +1160,7 @@ static bool wsl_to_fattr(struct cifs_open_info_data *data,\n>\n> name = ea->ea_data;\n> nlen = ea->ea_name_length;\n> - v = (void *)((u8 *)ea->ea_data + ea->ea_name_length + 1);\n> + v = (void *)((u8 *)name + nlen + 1);\n>\n> if (!strncmp(name, SMB2_WSL_XATTR_UID, nlen))\n> fattr->cf_uid = wsl_make_kuid(cifs_sb, v);\n> @@ -1168,9 +1168,9 @@ static bool wsl_to_fattr(struct cifs_open_info_data *data,\n> fattr->cf_gid = wsl_make_kgid(cifs_sb, v);\n> else if (!strncmp(name, SMB2_WSL_XATTR_MODE, nlen)) {\n> /* File type in reparse point tag and in xattr mode must match. */\n> - if (S_DT(fattr->cf_mode) != S_DT(le32_to_cpu(*(__le32 *)v)))\n> + if (S_DT(fattr->cf_mode) != S_DT(get_unaligned_le32(v)))\n> return false;\n> - fattr->cf_mode = (umode_t)le32_to_cpu(*(__le32 *)v);\n> + fattr->cf_mode = (umode_t)get_unaligned_le32(v);\n> } else if (!strncmp(name, SMB2_WSL_XATTR_DEV, nlen)) {\n> fattr->cf_rdev = reparse_mkdev(v);\n> have_xattr_dev = true;\n> diff --git a/fs/smb/client/reparse.h b/fs/smb/client/reparse.h\n> index 0164dc47bdfd..653213a6b7e8 100644\n> --- a/fs/smb/client/reparse.h\n> +++ b/fs/smb/client/reparse.h\n> @@ -23,7 +23,7 @@\n>\n> static inline dev_t reparse_mkdev(void *ptr)\n> {\n> - u64 v = le64_to_cpu(*(__le64 *)ptr);\n> + u64 v = get_unaligned_le64(ptr);\n>\n> return MKDEV(v & 0xffffffff, v >> 32);\n> }\n> @@ -31,7 +31,7 @@ static inline dev_t reparse_mkdev(void *ptr)\n> static inline kuid_t wsl_make_kuid(struct cifs_sb_info *cifs_sb,\n> void *ptr)\n> {\n> - u32 uid = le32_to_cpu(*(__le32 *)ptr);\n> + u32 uid = get_unaligned_le32(ptr);\n>\n> if (cifs_sb_flags(cifs_sb) & CIFS_MOUNT_OVERR_UID)\n> return cifs_sb->ctx->linux_uid;\n> @@ -41,7 +41,7 @@ static inline kuid_t wsl_make_kuid(struct cifs_sb_info *cifs_sb,\n> static inline kgid_t wsl_make_kgid(struct cifs_sb_info *cifs_sb,\n> void *ptr)\n> {\n> - u32 gid = le32_to_cpu(*(__le32 *)ptr);\n> + u32 gid = get_unaligned_le32(ptr);\n>\n> if (cifs_sb_flags(cifs_sb) & CIFS_MOUNT_OVERR_GID)\n> return cifs_sb->ctx->linux_gid;\n> diff --git a/fs/smb/client/smb2pdu.h b/fs/smb/client/smb2pdu.h\n> index 30d70097fe2f..6744606dab6c 100644\n> --- a/fs/smb/client/smb2pdu.h\n> +++ b/fs/smb/client/smb2pdu.h\n> @@ -211,6 +211,7 @@ struct compress_ioctl {\n> * BB consider moving to a different header\n> */\n>\n> +/* See MS-FSCC 2.4.16 */\n> struct smb2_file_full_ea_info { /* encoding of response for level 15 */\n> __le32 next_entry_offset;\n> __u8 flags;\n> --\n> 2.53.0","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=bKPULHoE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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Fri, 24 Apr 2026\n 14:41:38 -0700 (PDT)","Precedence":"bulk","X-Mailing-List":"linux-cifs@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","References":"<20260423055915.695024-1-youling.tang@linux.dev>","In-Reply-To":"<20260423055915.695024-1-youling.tang@linux.dev>","From":"Steve French ","Date":"Fri, 24 Apr 2026 16:41:25 -0500","X-Gm-Features":"AQROBzDFtvMZVAK35YyFHSHoudeYt35tw6rLVFvQPQKz_iTR_v32FTcWC26txsM","Message-ID":"\n ","Subject":"Re: [PATCH] smb/client: fix unaligned reads in wsl_to_fattr()","To":"Youling Tang ","Cc":"linkinjeon@kernel.org, pc@manguebit.org, ronniesahlberg@gmail.com,\n\tsprasad@microsoft.com, tom@talpey.com, bharathsm@microsoft.com,\n\tsenozhatsky@chromium.org, dhowells@redhat.com, chenxiaosong@chenxiaosong.com,\n\tgregkh@linuxfoundation.org, linux-cifs@vger.kernel.org,\n\tYouling Tang , ChenXiaoSong ","Content-Type":"text/plain; charset=\"UTF-8\"","Content-Transfer-Encoding":"quoted-printable"}},{"id":3682370,"web_url":"http://patchwork.ozlabs.org/comment/3682370/","msgid":"<5af92cc7-9767-41a7-8791-ee87687e6df3@chenxiaosong.com>","list_archive_url":null,"date":"2026-04-25T23:01:53","subject":"Re: [PATCH] smb/client: fix unaligned reads in wsl_to_fattr()","submitter":{"id":88754,"url":"http://patchwork.ozlabs.org/api/people/88754/","name":"ChenXiaoSong","email":"chenxiaosong@chenxiaosong.com"},"content":"Some older architectures require strict alignment, we will set up \nvirtual machine environments for testing.\n\nOn 2026/4/25 05:41, Steve French wrote:\n> Were you able to reproduce this bug with a test?","headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-cifs@vger.kernel.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=chenxiaosong.com header.i=@chenxiaosong.com\n header.a=rsa-sha256 header.s=key1 header.b=VnTc4KLH;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c09:e001:a7::12fc:5321; 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