Re: [PATCH V2] blk-mq: avoid sysfs buffer overflow by too many CPU cores

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On Fri, Aug 16, 2019 at 10:54:17AM +0800, Ming Lei wrote:
> It is reported that sysfs buffer overflow can be triggered in case
> of too many CPU cores(>841 on 4K PAGE_SIZE) when showing CPUs in
> blk_mq_hw_sysfs_cpus_show().
> 
> So use cpumap_print_to_pagebuf() to print the info and fix the potential
> buffer overflow issue.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Mark Ray <mark.ray@xxxxxxx>
> Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
> Fixes: 676141e48af7("blk-mq: don't dump CPU -> hw queue map on driver load")
> Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
> ---
>  block/blk-mq-sysfs.c | 15 +--------------
>  1 file changed, 1 insertion(+), 14 deletions(-)

No list of what changed from v1 under here?

Anyway, no, just delete the attribute please.

thanks,

greg k-h



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