Re: [PATCH] fs: change sys_truncate/sys_ftruncate length parameter type

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On Wed, 23 Sep 2009, Heiko Carstens wrote:
> 
> For both system calls user space passes a signed long length parameter,
> while the kernel side takes an unsigned long parameter and converts it
> later to signed long again.

No it doesn't.

Look at sys_ftruncate() again. It doesn't convert it to signed long at 
all. It converts it to 'loff_t' which is something different entirely.

Now, it may be that we _should_ convert it to 'long' like your patch does, 
but this is definitely not a "no changes" patch as far as I can tell. It 
limits ftruncate to 31 bits on 32-bit architectures, in ways it didn't use 
to be limited.

[ Note the "small" logic and the interaction with O_LARGEFILE. On a 32-bit 
  architecture, if you open with O_LARGEFILE, ftruncate() gets the full 
  32-bit range, and that's the part your patch broke. ]

So NAK. Not without some serious explanations on why I'm wrong and am just 
being unnecessarily difficult and a pinhead.

			Linus
--
To unsubscribe from this list: send the line "unsubscribe linux-arch" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Kernel]     [Kernel Newbies]     [x86 Platform Driver]     [Netdev]     [Linux Wireless]     [Netfilter]     [Bugtraq]     [Linux Filesystems]     [Yosemite Discussion]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Device Mapper]

  Powered by Linux