From cd2b2b57921d4caa7875e83198bb2aa71254328b Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Sun, 6 Sep 2026 14:40:23 -0300 Subject: [PATCH] smb: client: fix WSL reparse point uid/gid override wsl_to_fattr() unconditionally overwrites cf_uid/cf_gid with values from WSL extended attributes ($LXUID/$LXGID), ignoring the forceuid and forcegid mount options. Fix this by initializing cf_uid/cf_gid to the mount defaults and gating the $LXUID/$LXGID EA parsing on forceuid/forcegid. Closes: https://sashiko.dev/#/patchset/20260906190803.667489-1-pc%40manguebit.org Reviewed-by: Namjae Jeon Signed-off-by: Paulo Alcantara Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: Bharath SM Cc: stable@vger.kernel.org --- fs/smb/client/reparse.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-) diff --git a/fs/smb/client/reparse.c b/fs/smb/client/reparse.c index 5cc5b0410d48..178da801e775 100644 --- a/fs/smb/client/reparse.c +++ b/fs/smb/client/reparse.c @@ -1137,10 +1137,14 @@ static bool wsl_to_fattr(struct cifs_open_info_data *data, struct cifs_sb_info *cifs_sb, u32 tag, struct cifs_fattr *fattr) { + unsigned int sbflags = cifs_sb_flags(cifs_sb); struct smb2_file_full_ea_info *ea; bool have_xattr_dev = false; u32 next = 0; + fattr->cf_uid = cifs_sb->ctx->linux_uid; + fattr->cf_gid = cifs_sb->ctx->linux_gid; + switch (tag) { case IO_REPARSE_TAG_LX_SYMLINK: fattr->cf_mode |= S_IFLNK; @@ -1177,11 +1181,13 @@ static bool wsl_to_fattr(struct cifs_open_info_data *data, nlen = ea->ea_name_length; v = (void *)((u8 *)ea->ea_data + ea->ea_name_length + 1); - if (!strncmp(name, SMB2_WSL_XATTR_UID, nlen)) - fattr->cf_uid = wsl_make_kuid(cifs_sb, v); - else if (!strncmp(name, SMB2_WSL_XATTR_GID, nlen)) - fattr->cf_gid = wsl_make_kgid(cifs_sb, v); - else if (!strncmp(name, SMB2_WSL_XATTR_MODE, nlen)) { + if (!strncmp(name, SMB2_WSL_XATTR_UID, nlen)) { + if (!(sbflags & CIFS_MOUNT_OVERR_UID)) + fattr->cf_uid = wsl_make_kuid(cifs_sb, v); + } else if (!strncmp(name, SMB2_WSL_XATTR_GID, nlen)) { + if (!(sbflags & CIFS_MOUNT_OVERR_GID)) + fattr->cf_gid = wsl_make_kgid(cifs_sb, v); + } else if (!strncmp(name, SMB2_WSL_XATTR_MODE, nlen)) { /* File type in reparse point tag and in xattr mode must match. */ if (S_DT(fattr->cf_mode) != S_DT(le32_to_cpu(*(__le32 *)v))) return false;