This is a note to let you know that I've just added the patch titled
cifs: during remount, make sure passwords are in sync
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cifs-during-remount-make-sure-passwords-are-in-sync.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 3d9bfaebebe5a067aea3f0bab611da7bcba7c495
Author: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Date: Wed Oct 30 06:45:50 2024 +0000
cifs: during remount, make sure passwords are in sync
[ Upstream commit 0f0e357902957fba28ed31bde0d6921c6bd1485d ]
This fixes scenarios where remount can overwrite the only currently
working password, breaking reconnect.
We recently introduced a password2 field in both ses and ctx structs.
This was done so as to allow the client to rotate passwords for a mount
without any downtime. However, when the client transparently handles
password rotation, it can swap the values of the two password fields
in the ses struct, but not in smb3_fs_context struct that hangs off
cifs_sb. This can lead to a situation where a remount unintentionally
overwrites a working password in the ses struct.
In order to fix this, we first get the passwords in ctx struct
in-sync with ses struct, before replacing them with what the passwords
that could be passed as a part of remount.
Also, in order to avoid race condition between smb2_reconnect and
smb3_reconfigure, we make sure to lock session_mutex before changing
password and password2 fields of the ses structure.
Fixes: 35f834265e0d ("smb3: fix broken reconnect when password changing on the server by allowing password rotation")
Signed-off-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx>
Signed-off-by: Meetakshi Setiya <msetiya@xxxxxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c
index 8d7484400fe8e..6ba38bfa645b4 100644
--- a/fs/smb/client/fs_context.c
+++ b/fs/smb/client/fs_context.c
@@ -888,12 +888,37 @@ do { \
cifs_sb->ctx->field = NULL; \
} while (0)
+int smb3_sync_session_ctx_passwords(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
+{
+ if (ses->password &&
+ cifs_sb->ctx->password &&
+ strcmp(ses->password, cifs_sb->ctx->password)) {
+ kfree_sensitive(cifs_sb->ctx->password);
+ cifs_sb->ctx->password = kstrdup(ses->password, GFP_KERNEL);
+ if (!cifs_sb->ctx->password)
+ return -ENOMEM;
+ }
+ if (ses->password2 &&
+ cifs_sb->ctx->password2 &&
+ strcmp(ses->password2, cifs_sb->ctx->password2)) {
+ kfree_sensitive(cifs_sb->ctx->password2);
+ cifs_sb->ctx->password2 = kstrdup(ses->password2, GFP_KERNEL);
+ if (!cifs_sb->ctx->password2) {
+ kfree_sensitive(cifs_sb->ctx->password);
+ cifs_sb->ctx->password = NULL;
+ return -ENOMEM;
+ }
+ }
+ return 0;
+}
+
static int smb3_reconfigure(struct fs_context *fc)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
struct dentry *root = fc->root;
struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
struct cifs_ses *ses = cifs_sb_master_tcon(cifs_sb)->ses;
+ char *new_password = NULL, *new_password2 = NULL;
bool need_recon = false;
int rc;
@@ -913,21 +938,61 @@ static int smb3_reconfigure(struct fs_context *fc)
STEAL_STRING(cifs_sb, ctx, UNC);
STEAL_STRING(cifs_sb, ctx, source);
STEAL_STRING(cifs_sb, ctx, username);
+
if (need_recon == false)
STEAL_STRING_SENSITIVE(cifs_sb, ctx, password);
else {
- kfree_sensitive(ses->password);
- ses->password = kstrdup(ctx->password, GFP_KERNEL);
- if (!ses->password)
- return -ENOMEM;
- kfree_sensitive(ses->password2);
- ses->password2 = kstrdup(ctx->password2, GFP_KERNEL);
- if (!ses->password2) {
- kfree_sensitive(ses->password);
- ses->password = NULL;
+ if (ctx->password) {
+ new_password = kstrdup(ctx->password, GFP_KERNEL);
+ if (!new_password)
+ return -ENOMEM;
+ } else
+ STEAL_STRING_SENSITIVE(cifs_sb, ctx, password);
+ }
+
+ /*
+ * if a new password2 has been specified, then reset it's value
+ * inside the ses struct
+ */
+ if (ctx->password2) {
+ new_password2 = kstrdup(ctx->password2, GFP_KERNEL);
+ if (!new_password2) {
+ kfree_sensitive(new_password);
return -ENOMEM;
}
+ } else
+ STEAL_STRING_SENSITIVE(cifs_sb, ctx, password2);
+
+ /*
+ * we may update the passwords in the ses struct below. Make sure we do
+ * not race with smb2_reconnect
+ */
+ mutex_lock(&ses->session_mutex);
+
+ /*
+ * smb2_reconnect may swap password and password2 in case session setup
+ * failed. First get ctx passwords in sync with ses passwords. It should
+ * be okay to do this even if this function were to return an error at a
+ * later stage
+ */
+ rc = smb3_sync_session_ctx_passwords(cifs_sb, ses);
+ if (rc)
+ return rc;
+
+ /*
+ * now that allocations for passwords are done, commit them
+ */
+ if (new_password) {
+ kfree_sensitive(ses->password);
+ ses->password = new_password;
}
+ if (new_password2) {
+ kfree_sensitive(ses->password2);
+ ses->password2 = new_password2;
+ }
+
+ mutex_unlock(&ses->session_mutex);
+
STEAL_STRING(cifs_sb, ctx, domainname);
STEAL_STRING(cifs_sb, ctx, nodename);
STEAL_STRING(cifs_sb, ctx, iocharset);
diff --git a/fs/smb/client/fs_context.h b/fs/smb/client/fs_context.h
index cf577ec0dd0ac..bbd2063ab838d 100644
--- a/fs/smb/client/fs_context.h
+++ b/fs/smb/client/fs_context.h
@@ -298,6 +298,7 @@ static inline struct smb3_fs_context *smb3_fc2context(const struct fs_context *f
}
extern int smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx);
+extern int smb3_sync_session_ctx_passwords(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses);
extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
/*
