| Message ID | 20221002024628.106816-1-atteh.mailbox@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v4] ksmbd: validate share name from share config response | expand |
On Sun, 2 Oct 2022 05:46:28 +0300, Atte Heikkilä wrote: > Share config response may contain the share name without casefolding as > it is known to the user space daemon. When it is present, casefold and > compare it to the share name the share config request was made with. If > they differ, we have a share config which is incompatible with the way > share config caching is done. This is the case when CONFIG_UNICODE is > not set, the share name contains non-ASCII characters, and those non- > ASCII characters do not match those in the share name known to user > space. In other words, when CONFIG_UNICODE is not set, UTF-8 share > names now work but are only case-insensitive in the ASCII range. > > Signed-off-by: Atte Heikkilä <atteh.mailbox@gmail.com> > --- > v4: > - check for ksmbd_casefold_sharename() error with IS_ERR() > > v3: > - removed initial strcmp() check since it could only save a call to > ksmbd_casefold_sharename() for matching ASCII-only share names > > v2: > - no changes were made > > fs/ksmbd/ksmbd_netlink.h | 3 ++- > fs/ksmbd/mgmt/share_config.c | 20 +++++++++++++++++--- > fs/ksmbd/mgmt/share_config.h | 4 +++- > fs/ksmbd/mgmt/tree_connect.c | 4 ++-- > fs/ksmbd/misc.c | 4 ++-- > fs/ksmbd/misc.h | 1 + > 6 files changed, 27 insertions(+), 9 deletions(-) > > diff --git a/fs/ksmbd/ksmbd_netlink.h b/fs/ksmbd/ksmbd_netlink.h > index e0cbcfa98c7e..ff07c67f4565 100644 > --- a/fs/ksmbd/ksmbd_netlink.h > +++ b/fs/ksmbd/ksmbd_netlink.h > @@ -163,7 +163,8 @@ struct ksmbd_share_config_response { > __u16 force_directory_mode; > __u16 force_uid; > __u16 force_gid; > - __u32 reserved[128]; /* Reserved room */ > + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; > + __u32 reserved[112]; /* Reserved room */ > __u32 veto_list_sz; > __s8 ____payload[]; > }; > diff --git a/fs/ksmbd/mgmt/share_config.c b/fs/ksmbd/mgmt/share_config.c > index 5d039704c23c..dfb4bb365891 100644 > --- a/fs/ksmbd/mgmt/share_config.c > +++ b/fs/ksmbd/mgmt/share_config.c > @@ -16,6 +16,7 @@ > #include "user_config.h" > #include "user_session.h" > #include "../transport_ipc.h" > +#include "../misc.h" > > #define SHARE_HASH_BITS 3 > static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS); > @@ -119,7 +120,8 @@ static int parse_veto_list(struct ksmbd_share_config *share, > return 0; > } > > -static struct ksmbd_share_config *share_config_request(const char *name) > +static struct ksmbd_share_config *share_config_request(struct unicode_map *um, > + const char *name) > { > struct ksmbd_share_config_response *resp; > struct ksmbd_share_config *share = NULL; > @@ -133,6 +135,17 @@ static struct ksmbd_share_config *share_config_request(const char *name) > if (resp->flags == KSMBD_SHARE_FLAG_INVALID) > goto out; > > + if (*resp->share_name) { > + char *cf_resp_name; > + bool equal; > + > + cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name); > + equal = !IS_ERR(cf_resp_name) && !strcmp(cf_resp_name, name); > + kfree(cf_resp_name); Well, kfree() is *not* a no-op for ERR_PTR() like it is for NULL so this patch is not good either. At least I'm running out of ways to get this wrong. > + if (!equal) > + goto out; > + } > + > share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL); > if (!share) > goto out; > @@ -190,7 +203,8 @@ static struct ksmbd_share_config *share_config_request(const char *name) > return share; > } > > -struct ksmbd_share_config *ksmbd_share_config_get(const char *name) > +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, > + const char *name) > { > struct ksmbd_share_config *share; > > @@ -202,7 +216,7 @@ struct ksmbd_share_config *ksmbd_share_config_get(const char *name) > > if (share) > return share; > - return share_config_request(name); > + return share_config_request(um, name); > } > > bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, > diff --git a/fs/ksmbd/mgmt/share_config.h b/fs/ksmbd/mgmt/share_config.h > index 7f7e89ecfe61..3fd338293942 100644 > --- a/fs/ksmbd/mgmt/share_config.h > +++ b/fs/ksmbd/mgmt/share_config.h > @@ -9,6 +9,7 @@ > #include <linux/workqueue.h> > #include <linux/hashtable.h> > #include <linux/path.h> > +#include <linux/unicode.h> > > struct ksmbd_share_config { > char *name; > @@ -74,7 +75,8 @@ static inline void ksmbd_share_config_put(struct ksmbd_share_config *share) > __ksmbd_share_config_put(share); > } > > -struct ksmbd_share_config *ksmbd_share_config_get(const char *name); > +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, > + const char *name); > bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, > const char *filename); > #endif /* __SHARE_CONFIG_MANAGEMENT_H__ */ > diff --git a/fs/ksmbd/mgmt/tree_connect.c b/fs/ksmbd/mgmt/tree_connect.c > index 867c0286b901..8ce17b3fb8da 100644 > --- a/fs/ksmbd/mgmt/tree_connect.c > +++ b/fs/ksmbd/mgmt/tree_connect.c > @@ -26,7 +26,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, > struct sockaddr *peer_addr; > int ret; > > - sc = ksmbd_share_config_get(share_name); > + sc = ksmbd_share_config_get(conn->um, share_name); > if (!sc) > return status; > > @@ -61,7 +61,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, > struct ksmbd_share_config *new_sc; > > ksmbd_share_config_del(sc); > - new_sc = ksmbd_share_config_get(share_name); > + new_sc = ksmbd_share_config_get(conn->um, share_name); > if (!new_sc) { > pr_err("Failed to update stale share config\n"); > status.ret = -ESTALE; > diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c > index 28459b1efaa8..9e8afaa686e3 100644 > --- a/fs/ksmbd/misc.c > +++ b/fs/ksmbd/misc.c > @@ -227,7 +227,7 @@ void ksmbd_conv_path_to_windows(char *path) > strreplace(path, '/', '\\'); > } > > -static char *casefold_sharename(struct unicode_map *um, const char *name) > +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name) > { > char *cf_name; > int cf_len; > @@ -273,7 +273,7 @@ char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename) > name = (pos + 1); > > /* caller has to free the memory */ > - return casefold_sharename(um, name); > + return ksmbd_casefold_sharename(um, name); > } > > /** > diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h > index cc72f4e6baf2..1facfcd21200 100644 > --- a/fs/ksmbd/misc.h > +++ b/fs/ksmbd/misc.h > @@ -20,6 +20,7 @@ int get_nlink(struct kstat *st); > void ksmbd_conv_path_to_unix(char *path); > void ksmbd_strip_last_slash(char *path); > void ksmbd_conv_path_to_windows(char *path); > +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name); > char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename); > char *convert_to_unix_name(struct ksmbd_share_config *share, const char *name); > > -- > 2.37.3 > >
On 10/2/2022 11:40 AM, Atte Heikkilä wrote: > On Sun, 2 Oct 2022 05:46:28 +0300, Atte Heikkilä wrote: >> ... >> diff --git a/fs/ksmbd/ksmbd_netlink.h b/fs/ksmbd/ksmbd_netlink.h >> index e0cbcfa98c7e..ff07c67f4565 100644 >> --- a/fs/ksmbd/ksmbd_netlink.h >> +++ b/fs/ksmbd/ksmbd_netlink.h >> @@ -163,7 +163,8 @@ struct ksmbd_share_config_response { >> __u16 force_directory_mode; >> __u16 force_uid; >> __u16 force_gid; >> - __u32 reserved[128]; /* Reserved room */ >> + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; >> + __u32 reserved[112]; /* Reserved room */ I notice you still have "112" here, did you reject my suggestion to code the size relative to KSMBD_REQ_MAX_SHARE_NAME? Either way I think I made a flawed suggestion. The "reserved" field is __u32 but the KSMBD_REQ_MAX_SHARE_NAME is __s8. So, two things: - why is share_name an __s8? Wouldn't __u8 be more appropriate? - why is reserved a __u32? ISTM that __u8 would also be a better choice, and then the size would be "512 - KSMBD_REQ_MAX_SHARE_NAME". >> __u32 veto_list_sz; >> __s8 ____payload[]; >> }; >> diff --git a/fs/ksmbd/mgmt/share_config.c b/fs/ksmbd/mgmt/share_config.c >> index 5d039704c23c..dfb4bb365891 100644 >> --- a/fs/ksmbd/mgmt/share_config.c >> +++ b/fs/ksmbd/mgmt/share_config.c >> @@ -16,6 +16,7 @@ >> #include "user_config.h" >> #include "user_session.h" >> #include "../transport_ipc.h" >> +#include "../misc.h" >> >> #define SHARE_HASH_BITS 3 >> static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS); >> @@ -119,7 +120,8 @@ static int parse_veto_list(struct ksmbd_share_config *share, >> return 0; >> } >> >> -static struct ksmbd_share_config *share_config_request(const char *name) >> +static struct ksmbd_share_config *share_config_request(struct unicode_map *um, >> + const char *name) >> { >> struct ksmbd_share_config_response *resp; >> struct ksmbd_share_config *share = NULL; >> @@ -133,6 +135,17 @@ static struct ksmbd_share_config *share_config_request(const char *name) >> if (resp->flags == KSMBD_SHARE_FLAG_INVALID) >> goto out; >> >> + if (*resp->share_name) { >> + char *cf_resp_name; >> + bool equal; >> + >> + cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name); >> + equal = !IS_ERR(cf_resp_name) && !strcmp(cf_resp_name, name); >> + kfree(cf_resp_name); > > Well, kfree() is *not* a no-op for ERR_PTR() like it is for NULL so > this patch is not good either. At least I'm running out of ways to get > this wrong. :) Tom. > >> + if (!equal) >> + goto out; >> + } >> + >> share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL); >> if (!share) >> goto out; >> @@ -190,7 +203,8 @@ static struct ksmbd_share_config *share_config_request(const char *name) >> return share; >> } >> >> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name) >> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, >> + const char *name) >> { >> struct ksmbd_share_config *share; >> >> @@ -202,7 +216,7 @@ struct ksmbd_share_config *ksmbd_share_config_get(const char *name) >> >> if (share) >> return share; >> - return share_config_request(name); >> + return share_config_request(um, name); >> } >> >> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >> diff --git a/fs/ksmbd/mgmt/share_config.h b/fs/ksmbd/mgmt/share_config.h >> index 7f7e89ecfe61..3fd338293942 100644 >> --- a/fs/ksmbd/mgmt/share_config.h >> +++ b/fs/ksmbd/mgmt/share_config.h >> @@ -9,6 +9,7 @@ >> #include <linux/workqueue.h> >> #include <linux/hashtable.h> >> #include <linux/path.h> >> +#include <linux/unicode.h> >> >> struct ksmbd_share_config { >> char *name; >> @@ -74,7 +75,8 @@ static inline void ksmbd_share_config_put(struct ksmbd_share_config *share) >> __ksmbd_share_config_put(share); >> } >> >> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name); >> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, >> + const char *name); >> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >> const char *filename); >> #endif /* __SHARE_CONFIG_MANAGEMENT_H__ */ >> diff --git a/fs/ksmbd/mgmt/tree_connect.c b/fs/ksmbd/mgmt/tree_connect.c >> index 867c0286b901..8ce17b3fb8da 100644 >> --- a/fs/ksmbd/mgmt/tree_connect.c >> +++ b/fs/ksmbd/mgmt/tree_connect.c >> @@ -26,7 +26,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, >> struct sockaddr *peer_addr; >> int ret; >> >> - sc = ksmbd_share_config_get(share_name); >> + sc = ksmbd_share_config_get(conn->um, share_name); >> if (!sc) >> return status; >> >> @@ -61,7 +61,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, >> struct ksmbd_share_config *new_sc; >> >> ksmbd_share_config_del(sc); >> - new_sc = ksmbd_share_config_get(share_name); >> + new_sc = ksmbd_share_config_get(conn->um, share_name); >> if (!new_sc) { >> pr_err("Failed to update stale share config\n"); >> status.ret = -ESTALE; >> diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c >> index 28459b1efaa8..9e8afaa686e3 100644 >> --- a/fs/ksmbd/misc.c >> +++ b/fs/ksmbd/misc.c >> @@ -227,7 +227,7 @@ void ksmbd_conv_path_to_windows(char *path) >> strreplace(path, '/', '\\'); >> } >> >> -static char *casefold_sharename(struct unicode_map *um, const char *name) >> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name) >> { >> char *cf_name; >> int cf_len; >> @@ -273,7 +273,7 @@ char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename) >> name = (pos + 1); >> >> /* caller has to free the memory */ >> - return casefold_sharename(um, name); >> + return ksmbd_casefold_sharename(um, name); >> } >> >> /** >> diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h >> index cc72f4e6baf2..1facfcd21200 100644 >> --- a/fs/ksmbd/misc.h >> +++ b/fs/ksmbd/misc.h >> @@ -20,6 +20,7 @@ int get_nlink(struct kstat *st); >> void ksmbd_conv_path_to_unix(char *path); >> void ksmbd_strip_last_slash(char *path); >> void ksmbd_conv_path_to_windows(char *path); >> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name); >> char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename); >> char *convert_to_unix_name(struct ksmbd_share_config *share, const char *name); >> >> -- >> 2.37.3 >> >> >
On Sun, 2 Oct 2022 14:34:43 -0400, Tom Talpey wrote: > On 10/2/2022 11:40 AM, Atte Heikkilä wrote: >> On Sun, 2 Oct 2022 05:46:28 +0300, Atte Heikkilä wrote: >>> ... >>> diff --git a/fs/ksmbd/ksmbd_netlink.h b/fs/ksmbd/ksmbd_netlink.h >>> index e0cbcfa98c7e..ff07c67f4565 100644 >>> --- a/fs/ksmbd/ksmbd_netlink.h >>> +++ b/fs/ksmbd/ksmbd_netlink.h >>> @@ -163,7 +163,8 @@ struct ksmbd_share_config_response { >>> __u16 force_directory_mode; >>> __u16 force_uid; >>> __u16 force_gid; >>> - __u32 reserved[128]; /* Reserved room */ >>> + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; >>> + __u32 reserved[112]; /* Reserved room */ > > I notice you still have "112" here, did you reject my suggestion > to code the size relative to KSMBD_REQ_MAX_SHARE_NAME? > If size of `reserved' should be relative, then it would be: 128 - DIV_ROUND_UP(KSMBD_REQ_MAX_SHARE_NAME, sizeof(__u32)) Since ksmbd-tools already has the 112 (128-64/4), I thought to keep the kernel side consistent with it for now. > Either way I think I made a flawed suggestion. The "reserved" field > is __u32 but the KSMBD_REQ_MAX_SHARE_NAME is __s8. So, two things: > > - why is share_name an __s8? Wouldn't __u8 be more appropriate? As I understand it, the only reason for `__s8' over `__u8' here is that `char' is most often a signed type. > - why is reserved a __u32? ISTM that __u8 would also be a better > choice, and then the size would be "512 - KSMBD_REQ_MAX_SHARE_NAME". > > I don't know why `reserved' is `__u32'. I agree that it would be better if it was `__u8'. >>> __u32 veto_list_sz; >>> __s8 ____payload[]; >>> }; >>> diff --git a/fs/ksmbd/mgmt/share_config.c b/fs/ksmbd/mgmt/share_config.c >>> index 5d039704c23c..dfb4bb365891 100644 >>> --- a/fs/ksmbd/mgmt/share_config.c >>> +++ b/fs/ksmbd/mgmt/share_config.c >>> @@ -16,6 +16,7 @@ >>> #include "user_config.h" >>> #include "user_session.h" >>> #include "../transport_ipc.h" >>> +#include "../misc.h" >>> >>> #define SHARE_HASH_BITS 3 >>> static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS); >>> @@ -119,7 +120,8 @@ static int parse_veto_list(struct ksmbd_share_config *share, >>> return 0; >>> } >>> >>> -static struct ksmbd_share_config *share_config_request(const char *name) >>> +static struct ksmbd_share_config *share_config_request(struct unicode_map *um, >>> + const char *name) >>> { >>> struct ksmbd_share_config_response *resp; >>> struct ksmbd_share_config *share = NULL; >>> @@ -133,6 +135,17 @@ static struct ksmbd_share_config *share_config_request(const char *name) >>> if (resp->flags == KSMBD_SHARE_FLAG_INVALID) >>> goto out; >>> >>> + if (*resp->share_name) { >>> + char *cf_resp_name; >>> + bool equal; >>> + >>> + cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name); >>> + equal = !IS_ERR(cf_resp_name) && !strcmp(cf_resp_name, name); >>> + kfree(cf_resp_name); >> >> Well, kfree() is *not* a no-op for ERR_PTR() like it is for NULL so >> this patch is not good either. At least I'm running out of ways to get >> this wrong. > > :) > > Tom. > > >> >>> + if (!equal) >>> + goto out; >>> + } >>> + >>> share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL); >>> if (!share) >>> goto out; >>> @@ -190,7 +203,8 @@ static struct ksmbd_share_config *share_config_request(const char *name) >>> return share; >>> } >>> >>> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name) >>> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, >>> + const char *name) >>> { >>> struct ksmbd_share_config *share; >>> >>> @@ -202,7 +216,7 @@ struct ksmbd_share_config *ksmbd_share_config_get(const char *name) >>> >>> if (share) >>> return share; >>> - return share_config_request(name); >>> + return share_config_request(um, name); >>> } >>> >>> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >>> diff --git a/fs/ksmbd/mgmt/share_config.h b/fs/ksmbd/mgmt/share_config.h >>> index 7f7e89ecfe61..3fd338293942 100644 >>> --- a/fs/ksmbd/mgmt/share_config.h >>> +++ b/fs/ksmbd/mgmt/share_config.h >>> @@ -9,6 +9,7 @@ >>> #include <linux/workqueue.h> >>> #include <linux/hashtable.h> >>> #include <linux/path.h> >>> +#include <linux/unicode.h> >>> >>> struct ksmbd_share_config { >>> char *name; >>> @@ -74,7 +75,8 @@ static inline void ksmbd_share_config_put(struct ksmbd_share_config *share) >>> __ksmbd_share_config_put(share); >>> } >>> >>> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name); >>> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, >>> + const char *name); >>> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >>> const char *filename); >>> #endif /* __SHARE_CONFIG_MANAGEMENT_H__ */ >>> diff --git a/fs/ksmbd/mgmt/tree_connect.c b/fs/ksmbd/mgmt/tree_connect.c >>> index 867c0286b901..8ce17b3fb8da 100644 >>> --- a/fs/ksmbd/mgmt/tree_connect.c >>> +++ b/fs/ksmbd/mgmt/tree_connect.c >>> @@ -26,7 +26,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, >>> struct sockaddr *peer_addr; >>> int ret; >>> >>> - sc = ksmbd_share_config_get(share_name); >>> + sc = ksmbd_share_config_get(conn->um, share_name); >>> if (!sc) >>> return status; >>> >>> @@ -61,7 +61,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, >>> struct ksmbd_share_config *new_sc; >>> >>> ksmbd_share_config_del(sc); >>> - new_sc = ksmbd_share_config_get(share_name); >>> + new_sc = ksmbd_share_config_get(conn->um, share_name); >>> if (!new_sc) { >>> pr_err("Failed to update stale share config\n"); >>> status.ret = -ESTALE; >>> diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c >>> index 28459b1efaa8..9e8afaa686e3 100644 >>> --- a/fs/ksmbd/misc.c >>> +++ b/fs/ksmbd/misc.c >>> @@ -227,7 +227,7 @@ void ksmbd_conv_path_to_windows(char *path) >>> strreplace(path, '/', '\\'); >>> } >>> >>> -static char *casefold_sharename(struct unicode_map *um, const char *name) >>> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name) >>> { >>> char *cf_name; >>> int cf_len; >>> @@ -273,7 +273,7 @@ char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename) >>> name = (pos + 1); >>> >>> /* caller has to free the memory */ >>> - return casefold_sharename(um, name); >>> + return ksmbd_casefold_sharename(um, name); >>> } >>> >>> /** >>> diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h >>> index cc72f4e6baf2..1facfcd21200 100644 >>> --- a/fs/ksmbd/misc.h >>> +++ b/fs/ksmbd/misc.h >>> @@ -20,6 +20,7 @@ int get_nlink(struct kstat *st); >>> void ksmbd_conv_path_to_unix(char *path); >>> void ksmbd_strip_last_slash(char *path); >>> void ksmbd_conv_path_to_windows(char *path); >>> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name); >>> char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename); >>> char *convert_to_unix_name(struct ksmbd_share_config *share, const char *name); >>> >>> -- >>> 2.37.3 >>> >>> >> >
2022-10-03 6:21 GMT+09:00, Atte Heikkilä <atteh.mailbox@gmail.com>: > On Sun, 2 Oct 2022 14:34:43 -0400, Tom Talpey wrote: >> On 10/2/2022 11:40 AM, Atte Heikkilä wrote: >>> On Sun, 2 Oct 2022 05:46:28 +0300, Atte Heikkilä wrote: >>>> ... >>>> diff --git a/fs/ksmbd/ksmbd_netlink.h b/fs/ksmbd/ksmbd_netlink.h >>>> index e0cbcfa98c7e..ff07c67f4565 100644 >>>> --- a/fs/ksmbd/ksmbd_netlink.h >>>> +++ b/fs/ksmbd/ksmbd_netlink.h >>>> @@ -163,7 +163,8 @@ struct ksmbd_share_config_response { >>>> __u16 force_directory_mode; >>>> __u16 force_uid; >>>> __u16 force_gid; >>>> - __u32 reserved[128]; /* Reserved room */ >>>> + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; >>>> + __u32 reserved[112]; /* Reserved room */ >> >> I notice you still have "112" here, did you reject my suggestion >> to code the size relative to KSMBD_REQ_MAX_SHARE_NAME? >> > > If size of `reserved' should be relative, then it would be: > 128 - DIV_ROUND_UP(KSMBD_REQ_MAX_SHARE_NAME, sizeof(__u32)) > > Since ksmbd-tools already has the 112 (128-64/4), I thought to keep the > kernel side consistent with it for now. > >> Either way I think I made a flawed suggestion. The "reserved" field >> is __u32 but the KSMBD_REQ_MAX_SHARE_NAME is __s8. So, two things: >> >> - why is share_name an __s8? Wouldn't __u8 be more appropriate? > > As I understand it, the only reason for `__s8' over `__u8' here is that > `char' is most often a signed type. > >> - why is reserved a __u32? ISTM that __u8 would also be a better >> choice, and then the size would be "512 - KSMBD_REQ_MAX_SHARE_NAME". >> >> > > I don't know why `reserved' is `__u32'. I agree that it would be better > if it was `__u8'. We can make another patch for both ksmbd/ksmbd-tools later. > >>>> __u32 veto_list_sz; >>>> __s8 ____payload[]; >>>> }; >>>> diff --git a/fs/ksmbd/mgmt/share_config.c >>>> b/fs/ksmbd/mgmt/share_config.c >>>> index 5d039704c23c..dfb4bb365891 100644 >>>> --- a/fs/ksmbd/mgmt/share_config.c >>>> +++ b/fs/ksmbd/mgmt/share_config.c >>>> @@ -16,6 +16,7 @@ >>>> #include "user_config.h" >>>> #include "user_session.h" >>>> #include "../transport_ipc.h" >>>> +#include "../misc.h" >>>> >>>> #define SHARE_HASH_BITS 3 >>>> static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS); >>>> @@ -119,7 +120,8 @@ static int parse_veto_list(struct ksmbd_share_config >>>> *share, >>>> return 0; >>>> } >>>> >>>> -static struct ksmbd_share_config *share_config_request(const char >>>> *name) >>>> +static struct ksmbd_share_config *share_config_request(struct >>>> unicode_map *um, >>>> + const char *name) >>>> { >>>> struct ksmbd_share_config_response *resp; >>>> struct ksmbd_share_config *share = NULL; >>>> @@ -133,6 +135,17 @@ static struct ksmbd_share_config >>>> *share_config_request(const char *name) >>>> if (resp->flags == KSMBD_SHARE_FLAG_INVALID) >>>> goto out; >>>> >>>> + if (*resp->share_name) { >>>> + char *cf_resp_name; >>>> + bool equal; >>>> + >>>> + cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name); >>>> + equal = !IS_ERR(cf_resp_name) && !strcmp(cf_resp_name, name); >>>> + kfree(cf_resp_name); >>> >>> Well, kfree() is *not* a no-op for ERR_PTR() like it is for NULL so >>> this patch is not good either. At least I'm running out of ways to get >>> this wrong. >> >> :) >> >> Tom. >> >> >>> >>>> + if (!equal) >>>> + goto out; >>>> + } >>>> + >>>> share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL); >>>> if (!share) >>>> goto out; >>>> @@ -190,7 +203,8 @@ static struct ksmbd_share_config >>>> *share_config_request(const char *name) >>>> return share; >>>> } >>>> >>>> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name) >>>> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map >>>> *um, >>>> + const char *name) >>>> { >>>> struct ksmbd_share_config *share; >>>> >>>> @@ -202,7 +216,7 @@ struct ksmbd_share_config >>>> *ksmbd_share_config_get(const char *name) >>>> >>>> if (share) >>>> return share; >>>> - return share_config_request(name); >>>> + return share_config_request(um, name); >>>> } >>>> >>>> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >>>> diff --git a/fs/ksmbd/mgmt/share_config.h >>>> b/fs/ksmbd/mgmt/share_config.h >>>> index 7f7e89ecfe61..3fd338293942 100644 >>>> --- a/fs/ksmbd/mgmt/share_config.h >>>> +++ b/fs/ksmbd/mgmt/share_config.h >>>> @@ -9,6 +9,7 @@ >>>> #include <linux/workqueue.h> >>>> #include <linux/hashtable.h> >>>> #include <linux/path.h> >>>> +#include <linux/unicode.h> >>>> >>>> struct ksmbd_share_config { >>>> char *name; >>>> @@ -74,7 +75,8 @@ static inline void ksmbd_share_config_put(struct >>>> ksmbd_share_config *share) >>>> __ksmbd_share_config_put(share); >>>> } >>>> >>>> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name); >>>> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map >>>> *um, >>>> + const char *name); >>>> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >>>> const char *filename); >>>> #endif /* __SHARE_CONFIG_MANAGEMENT_H__ */ >>>> diff --git a/fs/ksmbd/mgmt/tree_connect.c >>>> b/fs/ksmbd/mgmt/tree_connect.c >>>> index 867c0286b901..8ce17b3fb8da 100644 >>>> --- a/fs/ksmbd/mgmt/tree_connect.c >>>> +++ b/fs/ksmbd/mgmt/tree_connect.c >>>> @@ -26,7 +26,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, >>>> struct ksmbd_session *sess, >>>> struct sockaddr *peer_addr; >>>> int ret; >>>> >>>> - sc = ksmbd_share_config_get(share_name); >>>> + sc = ksmbd_share_config_get(conn->um, share_name); >>>> if (!sc) >>>> return status; >>>> >>>> @@ -61,7 +61,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, >>>> struct ksmbd_session *sess, >>>> struct ksmbd_share_config *new_sc; >>>> >>>> ksmbd_share_config_del(sc); >>>> - new_sc = ksmbd_share_config_get(share_name); >>>> + new_sc = ksmbd_share_config_get(conn->um, share_name); >>>> if (!new_sc) { >>>> pr_err("Failed to update stale share config\n"); >>>> status.ret = -ESTALE; >>>> diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c >>>> index 28459b1efaa8..9e8afaa686e3 100644 >>>> --- a/fs/ksmbd/misc.c >>>> +++ b/fs/ksmbd/misc.c >>>> @@ -227,7 +227,7 @@ void ksmbd_conv_path_to_windows(char *path) >>>> strreplace(path, '/', '\\'); >>>> } >>>> >>>> -static char *casefold_sharename(struct unicode_map *um, const char >>>> *name) >>>> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char >>>> *name) >>>> { >>>> char *cf_name; >>>> int cf_len; >>>> @@ -273,7 +273,7 @@ char *ksmbd_extract_sharename(struct unicode_map >>>> *um, const char *treename) >>>> name = (pos + 1); >>>> >>>> /* caller has to free the memory */ >>>> - return casefold_sharename(um, name); >>>> + return ksmbd_casefold_sharename(um, name); >>>> } >>>> >>>> /** >>>> diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h >>>> index cc72f4e6baf2..1facfcd21200 100644 >>>> --- a/fs/ksmbd/misc.h >>>> +++ b/fs/ksmbd/misc.h >>>> @@ -20,6 +20,7 @@ int get_nlink(struct kstat *st); >>>> void ksmbd_conv_path_to_unix(char *path); >>>> void ksmbd_strip_last_slash(char *path); >>>> void ksmbd_conv_path_to_windows(char *path); >>>> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char >>>> *name); >>>> char *ksmbd_extract_sharename(struct unicode_map *um, const char >>>> *treename); >>>> char *convert_to_unix_name(struct ksmbd_share_config *share, const >>>> char *name); >>>> >>>> -- >>>> 2.37.3 >>>> >>>> >>> >> >
On 10/2/2022 10:06 PM, Namjae Jeon wrote: > 2022-10-03 6:21 GMT+09:00, Atte Heikkilä <atteh.mailbox@gmail.com>: >> On Sun, 2 Oct 2022 14:34:43 -0400, Tom Talpey wrote: >>> On 10/2/2022 11:40 AM, Atte Heikkilä wrote: >>>> On Sun, 2 Oct 2022 05:46:28 +0300, Atte Heikkilä wrote: >>>>> ... >>>>> diff --git a/fs/ksmbd/ksmbd_netlink.h b/fs/ksmbd/ksmbd_netlink.h >>>>> index e0cbcfa98c7e..ff07c67f4565 100644 >>>>> --- a/fs/ksmbd/ksmbd_netlink.h >>>>> +++ b/fs/ksmbd/ksmbd_netlink.h >>>>> @@ -163,7 +163,8 @@ struct ksmbd_share_config_response { >>>>> __u16 force_directory_mode; >>>>> __u16 force_uid; >>>>> __u16 force_gid; >>>>> - __u32 reserved[128]; /* Reserved room */ >>>>> + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; >>>>> + __u32 reserved[112]; /* Reserved room */ >>> >>> I notice you still have "112" here, did you reject my suggestion >>> to code the size relative to KSMBD_REQ_MAX_SHARE_NAME? >>> >> >> If size of `reserved' should be relative, then it would be: >> 128 - DIV_ROUND_UP(KSMBD_REQ_MAX_SHARE_NAME, sizeof(__u32)) >> >> Since ksmbd-tools already has the 112 (128-64/4), I thought to keep the >> kernel side consistent with it for now. >> >>> Either way I think I made a flawed suggestion. The "reserved" field >>> is __u32 but the KSMBD_REQ_MAX_SHARE_NAME is __s8. So, two things: >>> >>> - why is share_name an __s8? Wouldn't __u8 be more appropriate? >> >> As I understand it, the only reason for `__s8' over `__u8' here is that >> `char' is most often a signed type. >> >>> - why is reserved a __u32? ISTM that __u8 would also be a better >>> choice, and then the size would be "512 - KSMBD_REQ_MAX_SHARE_NAME". >>> >>> >> >> I don't know why `reserved' is `__u32'. I agree that it would be better >> if it was `__u8'. > We can make another patch for both ksmbd/ksmbd-tools later. Two copies of this whole structure is a bug waiting to happen. The best approach would be to place the definition in a single shared header file. And it may need some sort of version stamp, if that huge "reserved" block is to be used. I believe the kernel include/uapi tree is an established place for this type of user/kernel interface definition. A side benefit is that because of the ABI implications, changes there are pretty well-vetted. Tom. >> >>>>> __u32 veto_list_sz; >>>>> __s8 ____payload[]; >>>>> }; >>>>> diff --git a/fs/ksmbd/mgmt/share_config.c >>>>> b/fs/ksmbd/mgmt/share_config.c >>>>> index 5d039704c23c..dfb4bb365891 100644 >>>>> --- a/fs/ksmbd/mgmt/share_config.c >>>>> +++ b/fs/ksmbd/mgmt/share_config.c >>>>> @@ -16,6 +16,7 @@ >>>>> #include "user_config.h" >>>>> #include "user_session.h" >>>>> #include "../transport_ipc.h" >>>>> +#include "../misc.h" >>>>> >>>>> #define SHARE_HASH_BITS 3 >>>>> static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS); >>>>> @@ -119,7 +120,8 @@ static int parse_veto_list(struct ksmbd_share_config >>>>> *share, >>>>> return 0; >>>>> } >>>>> >>>>> -static struct ksmbd_share_config *share_config_request(const char >>>>> *name) >>>>> +static struct ksmbd_share_config *share_config_request(struct >>>>> unicode_map *um, >>>>> + const char *name) >>>>> { >>>>> struct ksmbd_share_config_response *resp; >>>>> struct ksmbd_share_config *share = NULL; >>>>> @@ -133,6 +135,17 @@ static struct ksmbd_share_config >>>>> *share_config_request(const char *name) >>>>> if (resp->flags == KSMBD_SHARE_FLAG_INVALID) >>>>> goto out; >>>>> >>>>> + if (*resp->share_name) { >>>>> + char *cf_resp_name; >>>>> + bool equal; >>>>> + >>>>> + cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name); >>>>> + equal = !IS_ERR(cf_resp_name) && !strcmp(cf_resp_name, name); >>>>> + kfree(cf_resp_name); >>>> >>>> Well, kfree() is *not* a no-op for ERR_PTR() like it is for NULL so >>>> this patch is not good either. At least I'm running out of ways to get >>>> this wrong. >>> >>> :) >>> >>> Tom. >>> >>> >>>> >>>>> + if (!equal) >>>>> + goto out; >>>>> + } >>>>> + >>>>> share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL); >>>>> if (!share) >>>>> goto out; >>>>> @@ -190,7 +203,8 @@ static struct ksmbd_share_config >>>>> *share_config_request(const char *name) >>>>> return share; >>>>> } >>>>> >>>>> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name) >>>>> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map >>>>> *um, >>>>> + const char *name) >>>>> { >>>>> struct ksmbd_share_config *share; >>>>> >>>>> @@ -202,7 +216,7 @@ struct ksmbd_share_config >>>>> *ksmbd_share_config_get(const char *name) >>>>> >>>>> if (share) >>>>> return share; >>>>> - return share_config_request(name); >>>>> + return share_config_request(um, name); >>>>> } >>>>> >>>>> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >>>>> diff --git a/fs/ksmbd/mgmt/share_config.h >>>>> b/fs/ksmbd/mgmt/share_config.h >>>>> index 7f7e89ecfe61..3fd338293942 100644 >>>>> --- a/fs/ksmbd/mgmt/share_config.h >>>>> +++ b/fs/ksmbd/mgmt/share_config.h >>>>> @@ -9,6 +9,7 @@ >>>>> #include <linux/workqueue.h> >>>>> #include <linux/hashtable.h> >>>>> #include <linux/path.h> >>>>> +#include <linux/unicode.h> >>>>> >>>>> struct ksmbd_share_config { >>>>> char *name; >>>>> @@ -74,7 +75,8 @@ static inline void ksmbd_share_config_put(struct >>>>> ksmbd_share_config *share) >>>>> __ksmbd_share_config_put(share); >>>>> } >>>>> >>>>> -struct ksmbd_share_config *ksmbd_share_config_get(const char *name); >>>>> +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map >>>>> *um, >>>>> + const char *name); >>>>> bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, >>>>> const char *filename); >>>>> #endif /* __SHARE_CONFIG_MANAGEMENT_H__ */ >>>>> diff --git a/fs/ksmbd/mgmt/tree_connect.c >>>>> b/fs/ksmbd/mgmt/tree_connect.c >>>>> index 867c0286b901..8ce17b3fb8da 100644 >>>>> --- a/fs/ksmbd/mgmt/tree_connect.c >>>>> +++ b/fs/ksmbd/mgmt/tree_connect.c >>>>> @@ -26,7 +26,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, >>>>> struct ksmbd_session *sess, >>>>> struct sockaddr *peer_addr; >>>>> int ret; >>>>> >>>>> - sc = ksmbd_share_config_get(share_name); >>>>> + sc = ksmbd_share_config_get(conn->um, share_name); >>>>> if (!sc) >>>>> return status; >>>>> >>>>> @@ -61,7 +61,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, >>>>> struct ksmbd_session *sess, >>>>> struct ksmbd_share_config *new_sc; >>>>> >>>>> ksmbd_share_config_del(sc); >>>>> - new_sc = ksmbd_share_config_get(share_name); >>>>> + new_sc = ksmbd_share_config_get(conn->um, share_name); >>>>> if (!new_sc) { >>>>> pr_err("Failed to update stale share config\n"); >>>>> status.ret = -ESTALE; >>>>> diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c >>>>> index 28459b1efaa8..9e8afaa686e3 100644 >>>>> --- a/fs/ksmbd/misc.c >>>>> +++ b/fs/ksmbd/misc.c >>>>> @@ -227,7 +227,7 @@ void ksmbd_conv_path_to_windows(char *path) >>>>> strreplace(path, '/', '\\'); >>>>> } >>>>> >>>>> -static char *casefold_sharename(struct unicode_map *um, const char >>>>> *name) >>>>> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char >>>>> *name) >>>>> { >>>>> char *cf_name; >>>>> int cf_len; >>>>> @@ -273,7 +273,7 @@ char *ksmbd_extract_sharename(struct unicode_map >>>>> *um, const char *treename) >>>>> name = (pos + 1); >>>>> >>>>> /* caller has to free the memory */ >>>>> - return casefold_sharename(um, name); >>>>> + return ksmbd_casefold_sharename(um, name); >>>>> } >>>>> >>>>> /** >>>>> diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h >>>>> index cc72f4e6baf2..1facfcd21200 100644 >>>>> --- a/fs/ksmbd/misc.h >>>>> +++ b/fs/ksmbd/misc.h >>>>> @@ -20,6 +20,7 @@ int get_nlink(struct kstat *st); >>>>> void ksmbd_conv_path_to_unix(char *path); >>>>> void ksmbd_strip_last_slash(char *path); >>>>> void ksmbd_conv_path_to_windows(char *path); >>>>> +char *ksmbd_casefold_sharename(struct unicode_map *um, const char >>>>> *name); >>>>> char *ksmbd_extract_sharename(struct unicode_map *um, const char >>>>> *treename); >>>>> char *convert_to_unix_name(struct ksmbd_share_config *share, const >>>>> char *name); >>>>> >>>>> -- >>>>> 2.37.3 >>>>> >>>>> >>>> >>> >> >
diff --git a/fs/ksmbd/ksmbd_netlink.h b/fs/ksmbd/ksmbd_netlink.h index e0cbcfa98c7e..ff07c67f4565 100644 --- a/fs/ksmbd/ksmbd_netlink.h +++ b/fs/ksmbd/ksmbd_netlink.h @@ -163,7 +163,8 @@ struct ksmbd_share_config_response { __u16 force_directory_mode; __u16 force_uid; __u16 force_gid; - __u32 reserved[128]; /* Reserved room */ + __s8 share_name[KSMBD_REQ_MAX_SHARE_NAME]; + __u32 reserved[112]; /* Reserved room */ __u32 veto_list_sz; __s8 ____payload[]; }; diff --git a/fs/ksmbd/mgmt/share_config.c b/fs/ksmbd/mgmt/share_config.c index 5d039704c23c..dfb4bb365891 100644 --- a/fs/ksmbd/mgmt/share_config.c +++ b/fs/ksmbd/mgmt/share_config.c @@ -16,6 +16,7 @@ #include "user_config.h" #include "user_session.h" #include "../transport_ipc.h" +#include "../misc.h" #define SHARE_HASH_BITS 3 static DEFINE_HASHTABLE(shares_table, SHARE_HASH_BITS); @@ -119,7 +120,8 @@ static int parse_veto_list(struct ksmbd_share_config *share, return 0; } -static struct ksmbd_share_config *share_config_request(const char *name) +static struct ksmbd_share_config *share_config_request(struct unicode_map *um, + const char *name) { struct ksmbd_share_config_response *resp; struct ksmbd_share_config *share = NULL; @@ -133,6 +135,17 @@ static struct ksmbd_share_config *share_config_request(const char *name) if (resp->flags == KSMBD_SHARE_FLAG_INVALID) goto out; + if (*resp->share_name) { + char *cf_resp_name; + bool equal; + + cf_resp_name = ksmbd_casefold_sharename(um, resp->share_name); + equal = !IS_ERR(cf_resp_name) && !strcmp(cf_resp_name, name); + kfree(cf_resp_name); + if (!equal) + goto out; + } + share = kzalloc(sizeof(struct ksmbd_share_config), GFP_KERNEL); if (!share) goto out; @@ -190,7 +203,8 @@ static struct ksmbd_share_config *share_config_request(const char *name) return share; } -struct ksmbd_share_config *ksmbd_share_config_get(const char *name) +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, + const char *name) { struct ksmbd_share_config *share; @@ -202,7 +216,7 @@ struct ksmbd_share_config *ksmbd_share_config_get(const char *name) if (share) return share; - return share_config_request(name); + return share_config_request(um, name); } bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, diff --git a/fs/ksmbd/mgmt/share_config.h b/fs/ksmbd/mgmt/share_config.h index 7f7e89ecfe61..3fd338293942 100644 --- a/fs/ksmbd/mgmt/share_config.h +++ b/fs/ksmbd/mgmt/share_config.h @@ -9,6 +9,7 @@ #include <linux/workqueue.h> #include <linux/hashtable.h> #include <linux/path.h> +#include <linux/unicode.h> struct ksmbd_share_config { char *name; @@ -74,7 +75,8 @@ static inline void ksmbd_share_config_put(struct ksmbd_share_config *share) __ksmbd_share_config_put(share); } -struct ksmbd_share_config *ksmbd_share_config_get(const char *name); +struct ksmbd_share_config *ksmbd_share_config_get(struct unicode_map *um, + const char *name); bool ksmbd_share_veto_filename(struct ksmbd_share_config *share, const char *filename); #endif /* __SHARE_CONFIG_MANAGEMENT_H__ */ diff --git a/fs/ksmbd/mgmt/tree_connect.c b/fs/ksmbd/mgmt/tree_connect.c index 867c0286b901..8ce17b3fb8da 100644 --- a/fs/ksmbd/mgmt/tree_connect.c +++ b/fs/ksmbd/mgmt/tree_connect.c @@ -26,7 +26,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, struct sockaddr *peer_addr; int ret; - sc = ksmbd_share_config_get(share_name); + sc = ksmbd_share_config_get(conn->um, share_name); if (!sc) return status; @@ -61,7 +61,7 @@ ksmbd_tree_conn_connect(struct ksmbd_conn *conn, struct ksmbd_session *sess, struct ksmbd_share_config *new_sc; ksmbd_share_config_del(sc); - new_sc = ksmbd_share_config_get(share_name); + new_sc = ksmbd_share_config_get(conn->um, share_name); if (!new_sc) { pr_err("Failed to update stale share config\n"); status.ret = -ESTALE; diff --git a/fs/ksmbd/misc.c b/fs/ksmbd/misc.c index 28459b1efaa8..9e8afaa686e3 100644 --- a/fs/ksmbd/misc.c +++ b/fs/ksmbd/misc.c @@ -227,7 +227,7 @@ void ksmbd_conv_path_to_windows(char *path) strreplace(path, '/', '\\'); } -static char *casefold_sharename(struct unicode_map *um, const char *name) +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name) { char *cf_name; int cf_len; @@ -273,7 +273,7 @@ char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename) name = (pos + 1); /* caller has to free the memory */ - return casefold_sharename(um, name); + return ksmbd_casefold_sharename(um, name); } /** diff --git a/fs/ksmbd/misc.h b/fs/ksmbd/misc.h index cc72f4e6baf2..1facfcd21200 100644 --- a/fs/ksmbd/misc.h +++ b/fs/ksmbd/misc.h @@ -20,6 +20,7 @@ int get_nlink(struct kstat *st); void ksmbd_conv_path_to_unix(char *path); void ksmbd_strip_last_slash(char *path); void ksmbd_conv_path_to_windows(char *path); +char *ksmbd_casefold_sharename(struct unicode_map *um, const char *name); char *ksmbd_extract_sharename(struct unicode_map *um, const char *treename); char *convert_to_unix_name(struct ksmbd_share_config *share, const char *name);
Share config response may contain the share name without casefolding as it is known to the user space daemon. When it is present, casefold and compare it to the share name the share config request was made with. If they differ, we have a share config which is incompatible with the way share config caching is done. This is the case when CONFIG_UNICODE is not set, the share name contains non-ASCII characters, and those non- ASCII characters do not match those in the share name known to user space. In other words, when CONFIG_UNICODE is not set, UTF-8 share names now work but are only case-insensitive in the ASCII range. Signed-off-by: Atte Heikkilä <atteh.mailbox@gmail.com> --- v4: - check for ksmbd_casefold_sharename() error with IS_ERR() v3: - removed initial strcmp() check since it could only save a call to ksmbd_casefold_sharename() for matching ASCII-only share names v2: - no changes were made fs/ksmbd/ksmbd_netlink.h | 3 ++- fs/ksmbd/mgmt/share_config.c | 20 +++++++++++++++++--- fs/ksmbd/mgmt/share_config.h | 4 +++- fs/ksmbd/mgmt/tree_connect.c | 4 ++-- fs/ksmbd/misc.c | 4 ++-- fs/ksmbd/misc.h | 1 + 6 files changed, 27 insertions(+), 9 deletions(-)