[PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Boris Protopopov]

When converting trailing spaces and periods in paths, do so
for every component of the path, not just the last component.
If the conversion is not done for every path component, then
subsequent operations in directories with trailing spaces or
periods (e.g. create(), mkdir()) will fail with ENOENT. This
is because on the server, the directory will have a special
symbol in its name, and the client needs to provide the same.

Cc: <stable@vger.kernel.org> # 4.9.x-5.8.x
Signed-off-by: Boris Protopopov <pboris@amazon.com>
---
 fs/cifs/cifs_unicode.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
index 498777d859eb..9bd03a231032 100644
--- a/fs/cifs/cifs_unicode.c
+++ b/fs/cifs/cifs_unicode.c
@@ -488,7 +488,13 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
 		else if (map_chars == SFM_MAP_UNI_RSVD) {
 			bool end_of_string;
 
-			if (i == srclen - 1)
+			/**
+			 * Remap spaces and periods found at the end of every
+			 * component of the path. The special cases of '.' and
+			 * '..' do not need to be dealt with explicitly because
+			 * they are addressed in namei.c:link_path_walk().
+			 **/
+			if ((i == srclen - 1) || (source[i+1] == '\\'))
 				end_of_string = true;
 			else
 				end_of_string = false;
-- 
2.18.4

Re: [PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Greg KH]

On Sat, Oct 17, 2020 at 03:28:39PM +0000, Boris Protopopov wrote:
> When converting trailing spaces and periods in paths, do so
> for every component of the path, not just the last component.
> If the conversion is not done for every path component, then
> subsequent operations in directories with trailing spaces or
> periods (e.g. create(), mkdir()) will fail with ENOENT. This
> is because on the server, the directory will have a special
> symbol in its name, and the client needs to provide the same.
> 
> Cc: <stable@vger.kernel.org> # 4.9.x-5.8.x
> Signed-off-by: Boris Protopopov <pboris@amazon.com>
> ---
>  fs/cifs/cifs_unicode.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
> index 498777d859eb..9bd03a231032 100644
> --- a/fs/cifs/cifs_unicode.c
> +++ b/fs/cifs/cifs_unicode.c
> @@ -488,7 +488,13 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
>  		else if (map_chars == SFM_MAP_UNI_RSVD) {
>  			bool end_of_string;
>  
> -			if (i == srclen - 1)
> +			/**
> +			 * Remap spaces and periods found at the end of every
> +			 * component of the path. The special cases of '.' and
> +			 * '..' do not need to be dealt with explicitly because
> +			 * they are addressed in namei.c:link_path_walk().
> +			 **/
> +			if ((i == srclen - 1) || (source[i+1] == '\\'))
>  				end_of_string = true;
>  			else
>  				end_of_string = false;
> -- 
> 2.18.4
> 

What is the git commit id of this in Linus's tree?

thanks,

greg k-h

Re: [PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Protopopov, Boris]

I could not find the patch in Linus's tree at https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/cifs/cifs_unicode.c#n491 or in the commit list. The patch is in linux-next, commit https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=7698a46ed868f03afe1871d7cb63061db6a62b71

On 10/18/20, 1:56 AM, "Greg KH" <gregkh@linuxfoundation.org> wrote:

    CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.



    On Sat, Oct 17, 2020 at 03:28:39PM +0000, Boris Protopopov wrote:
    > When converting trailing spaces and periods in paths, do so
    > for every component of the path, not just the last component.
    > If the conversion is not done for every path component, then
    > subsequent operations in directories with trailing spaces or
    > periods (e.g. create(), mkdir()) will fail with ENOENT. This
    > is because on the server, the directory will have a special
    > symbol in its name, and the client needs to provide the same.
    >
    > Cc: <stable@vger.kernel.org> # 4.9.x-5.8.x
    > Signed-off-by: Boris Protopopov <pboris@amazon.com>
    > ---
    >  fs/cifs/cifs_unicode.c | 8 +++++++-
    >  1 file changed, 7 insertions(+), 1 deletion(-)
    >
    > diff --git a/fs/cifs/cifs_unicode.c b/fs/cifs/cifs_unicode.c
    > index 498777d859eb..9bd03a231032 100644
    > --- a/fs/cifs/cifs_unicode.c
    > +++ b/fs/cifs/cifs_unicode.c
    > @@ -488,7 +488,13 @@ cifsConvertToUTF16(__le16 *target, const char *source, int srclen,
    >               else if (map_chars == SFM_MAP_UNI_RSVD) {
    >                       bool end_of_string;
    >
    > -                     if (i == srclen - 1)
    > +                     /**
    > +                      * Remap spaces and periods found at the end of every
    > +                      * component of the path. The special cases of '.' and
    > +                      * '..' do not need to be dealt with explicitly because
    > +                      * they are addressed in namei.c:link_path_walk().
    > +                      **/
    > +                     if ((i == srclen - 1) || (source[i+1] == '\\'))
    >                               end_of_string = true;
    >                       else
    >                               end_of_string = false;
    > --
    > 2.18.4
    >

    What is the git commit id of this in Linus's tree?

    thanks,

    greg k-h

Re: [PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Greg KH]

A: http://en.wikipedia.org/wiki/Top_post
Q: Were do I find info about this thing called top-posting?
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing in e-mail?

A: No.
Q: Should I include quotations after my reply?

http://daringfireball.net/2007/07/on_top

On Mon, Oct 19, 2020 at 02:17:35PM +0000, Protopopov, Boris wrote:
> I could not find the patch in Linus's tree at https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/cifs/cifs_unicode.c#n491 or in the commit list. The patch is in linux-next, commit https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=7698a46ed868f03afe1871d7cb63061db6a62b71

Have you read the rules for stable patches:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

Please do so, you seem to be missing the "MUST BE IN LINUS'S TREE"
requirement...

greg k-h

Re: [PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Protopopov, Boris]

OK thanks I will resubmit later. 

On 10/19/20, 1:42 PM, "Greg KH" <gregkh@linuxfoundation.org> wrote:

    CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe.



    A: http://en.wikipedia.org/wiki/Top_post
    Q: Were do I find info about this thing called top-posting?
    A: Because it messes up the order in which people normally read text.
    Q: Why is top-posting such a bad thing?
    A: Top-posting.
    Q: What is the most annoying thing in e-mail?

    A: No.
    Q: Should I include quotations after my reply?

    http://daringfireball.net/2007/07/on_top

    On Mon, Oct 19, 2020 at 02:17:35PM +0000, Protopopov, Boris wrote:
    > I could not find the patch in Linus's tree at https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/fs/cifs/cifs_unicode.c#n491 or in the commit list. The patch is in linux-next, commit https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=7698a46ed868f03afe1871d7cb63061db6a62b71

    Have you read the rules for stable patches:
        https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html

    Please do so, you seem to be missing the "MUST BE IN LINUS'S TREE"
    requirement...

    greg k-h

Re: [PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Greg KH]

On Fri, Oct 16, 2020 at 07:22:22PM +0000, Boris Protopopov wrote:
> 
> Please include in multiple versions

Include what???

[PATCH 4.9-5.8] Convert trailing spaces and periods in path components

[Boris Protopopov]

Please include in multiple versions