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S/390: Change struct statfs[64] member types to unsigned values

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Kay Sievers reported that coreutils' stat tool has a problem with
s390's statfs[64] definition:

> The definition of struct statfs::f_type needs a fix. s390 is the only
> architecture in the kernel that uses an int and expects magic
> constants lager than INT_MAX to fit into.
>
> A fix is needed to make Fedora boot on s390, it currently fails to do
> so. Userspace does not want to add code to paper-over this issue.

[...]

> Even coreutils cannot handle it:
>   #define RAMFS_MAGIC  0x858458f6
>   # stat -f -c%t /
>   ffffffff858458f6
>
>   #define BTRFS_SUPER_MAGIC 0x9123683E
>   # stat -f -c%t /mnt
>   ffffffff9123683e

The bug is caused by an implicit sign extension within the stat tool:

out_uint_x (pformat, prefix_len, statfsbuf->f_type);

where the format finally will be "%lx".
A similar problem can be found in the 'tail' tool.
s390 is the only architecture which has an int type f_type member in
struct statfs[64]. Other architectures have either unsigned ints or
long values, so that the problem doesn't occur there.

Therefore change the type of the f_type member to unsigned int, so
that we get zero extension instead sign extension when assignment to
a long value happens.

Reported-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens
2013-04-23 08:53:44 +02:00
committed by Andreas Krebbel
parent d34c915826
commit 5c95f7b66b
2 changed files with 18 additions and 12 deletions
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24
sysdeps/unix/sysv/linux/s390/bits/statfs.h
View File

@ -23,8 +23,8 @@
struct statfs
{
int f_type;
int f_bsize;
unsigned int f_type;
unsigned int f_bsize;
#ifndef __USE_FILE_OFFSET64
__fsblkcnt_t f_blocks;
__fsblkcnt_t f_bfree;
@ -39,27 +39,27 @@ struct statfs
__fsfilcnt64_t f_ffree;
#endif
__fsid_t f_fsid;
int f_namelen;
int f_frsize;
int f_flags;
int f_spare[4];
unsigned int f_namelen;
unsigned int f_frsize;
unsigned int f_flags;
unsigned int f_spare[4];
};
#ifdef __USE_LARGEFILE64
struct statfs64
{
int f_type;
int f_bsize;
unsigned int f_type;
unsigned int f_bsize;
__fsblkcnt64_t f_blocks;
__fsblkcnt64_t f_bfree;
__fsblkcnt64_t f_bavail;
__fsfilcnt64_t f_files;
__fsfilcnt64_t f_ffree;
__fsid_t f_fsid;
int f_namelen;
int f_frsize;
int f_flags;
int f_spare[4];
unsigned int f_namelen;
unsigned int f_frsize;
unsigned int f_flags;
unsigned int f_spare[4];
};
#endif