linux-kernel - Re: [PATCH] fuse: require /dev/fuse reads to have enough buffer capacity (take 2)

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Date:   Wed, 12 Jun 2019 15:03:49 +0200
From:   Sander Eikelenboom <linux@...elenboom.it>
To:     Kirill Smelkov <kirr@...edi.com>,
        Miklos Szeredi <mszeredi@...hat.com>
Cc:     Miklos Szeredi <miklos@...redi.hu>, gluster-devel@...ster.org,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] fuse: require /dev/fuse reads to have enough buffer
 capacity (take 2)

On 12/06/2019 13:25, Kirill Smelkov wrote:
> On Wed, Jun 12, 2019 at 09:44:49AM +0200, Miklos Szeredi wrote:
>> On Tue, Jun 11, 2019 at 10:28 PM Kirill Smelkov <kirr@...edi.com> wrote:
>>
>>> Miklos, would 4K -> `sizeof(fuse_in_header) + sizeof(fuse_write_in)` for
>>> header room change be accepted?
>>
>> Yes, next cycle.   For 4.2 I'll just push the revert.
> 
> Thanks Miklos. Please consider queuing the following patch for 5.3.
> Sander, could you please confirm that glusterfs is not broken with this
> version of the check?
> 
> Thanks beforehand,
> Kirill


Hmm unfortunately it doesn't build, see below.

--
Sander


In file included from ./include/linux/list.h:9:0,
                 from ./include/linux/wait.h:7,
                 from ./include/linux/wait_bit.h:8,
                 from ./include/linux/fs.h:6,
                 from fs/fuse/fuse_i.h:17,
                 from fs/fuse/dev.c:9:
fs/fuse/dev.c: In function ‘fuse_dev_do_read’:
fs/fuse/dev.c:1336:14: error: ‘fuse_in_header’ undeclared (first use in this function)
       sizeof(fuse_in_header) + sizeof(fuse_write_in) + fc->max_write))
              ^
./include/linux/kernel.h:818:40: note: in definition of macro ‘__typecheck’
   (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                                        ^
./include/linux/kernel.h:842:24: note: in expansion of macro ‘__safe_cmp’
  __builtin_choose_expr(__safe_cmp(x, y), \
                        ^~~~~~~~~~
./include/linux/kernel.h:918:27: note: in expansion of macro ‘__careful_cmp’
 #define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
                           ^~~~~~~~~~~~~
fs/fuse/dev.c:1335:15: note: in expansion of macro ‘max_t’
  if (nbytes < max_t(size_t, FUSE_MIN_READ_BUFFER,
               ^~~~~
fs/fuse/dev.c:1336:14: note: each undeclared identifier is reported only once for each function it appears in
       sizeof(fuse_in_header) + sizeof(fuse_write_in) + fc->max_write))
              ^
./include/linux/kernel.h:818:40: note: in definition of macro ‘__typecheck’
   (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                                        ^
./include/linux/kernel.h:842:24: note: in expansion of macro ‘__safe_cmp’
  __builtin_choose_expr(__safe_cmp(x, y), \
                        ^~~~~~~~~~
./include/linux/kernel.h:918:27: note: in expansion of macro ‘__careful_cmp’
 #define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
                           ^~~~~~~~~~~~~
fs/fuse/dev.c:1335:15: note: in expansion of macro ‘max_t’
  if (nbytes < max_t(size_t, FUSE_MIN_READ_BUFFER,
               ^~~~~
fs/fuse/dev.c:1336:39: error: ‘fuse_write_in’ undeclared (first use in this function)
       sizeof(fuse_in_header) + sizeof(fuse_write_in) + fc->max_write))
                                       ^
./include/linux/kernel.h:818:40: note: in definition of macro ‘__typecheck’
   (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                                        ^
./include/linux/kernel.h:842:24: note: in expansion of macro ‘__safe_cmp’
  __builtin_choose_expr(__safe_cmp(x, y), \
                        ^~~~~~~~~~
./include/linux/kernel.h:918:27: note: in expansion of macro ‘__careful_cmp’
 #define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
                           ^~~~~~~~~~~~~
fs/fuse/dev.c:1335:15: note: in expansion of macro ‘max_t’
  if (nbytes < max_t(size_t, FUSE_MIN_READ_BUFFER,
               ^~~~~
./include/linux/kernel.h:842:2: error: first argument to ‘__builtin_choose_expr’ not a constant
  __builtin_choose_expr(__safe_cmp(x, y), \
  ^
./include/linux/kernel.h:918:27: note: in expansion of macro ‘__careful_cmp’
 #define max_t(type, x, y) __careful_cmp((type)(x), (type)(y), >)
                           ^~~~~~~~~~~~~
fs/fuse/dev.c:1335:15: note: in expansion of macro ‘max_t’
  if (nbytes < max_t(size_t, FUSE_MIN_READ_BUFFER,
               ^~~~~
scripts/Makefile.build:278: recipe for target 'fs/fuse/dev.o' failed
make[3]: *** [fs/fuse/dev.o] Error 1
scripts/Makefile.build:489: recipe for target 'fs/fuse' failed
make[2]: *** [fs/fuse] Error 2