Re: [PATCH 11/40] ipv6/flowlabel: simplify pid namespace lookup

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

 



Christoph Hellwig <hch@xxxxxx> writes:

> On Sat, May 05, 2018 at 07:37:33AM -0500, Eric W. Biederman wrote:
>> Christoph Hellwig <hch@xxxxxx> writes:
>> 
>> > The shole seq_file sequence already operates under a single RCU lock pair,
>> > so move the pid namespace lookup into it, and stop grabbing a reference
>> > and remove all kinds of boilerplate code.
>> 
>> This is wrong.
>> 
>> Move task_active_pid_ns(current) from open to seq_start actually means
>> that the results if you pass this proc file between callers the results
>> will change.  So this breaks file descriptor passing.
>> 
>> Open is a bad place to access current.  In the middle of read/write is
>> broken.
>> 
>> 
>> In this particular instance looking up the pid namespace with
>> task_active_pid_ns was a personal brain fart.  What the code should be
>> doing (with an appropriate helper) is:
>> 
>> struct pid_namespace *pid_ns = inode->i_sb->s_fs_info;
>> 
>> Because each mount of proc is bound to a pid namespace.  Looking up the
>> pid namespace from the super_block is a much better way to go.
>
> What do you have in mind for the helper?  For now I've thrown it in
> opencoded into my working tree, but I'd be glad to add a helper.
>
> struct pid_namespace *proc_pid_namespace(struct inode *inode)
> {
> 	// maybe warn on for s_magic not on procfs??
> 	return inode->i_sb->s_fs_info;
> }

That should work.  Ideally out of line for the proc_fs.h version.
Basically it should be a cousin of PDE_DATA.

Eric

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



[Index of Archives]     [Linux IBM ACPI]     [Linux Power Management]     [Linux Kernel]     [Linux Laptop]     [Kernel Newbies]     [Share Photos]     [Security]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux