Re: [PATCH v2 0/2] virtiofsd: stay under fs.file-max sysctl limit (CVE-2020-10717)

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Stefan Hajnoczi (stefanha@redhat.com) wrote:
> This patch series introduces the --rlimit-nofile=NUM option for setting the
> number of open files on the virtiofsd process.  This gives users and management
> tools more control over resource limits.
> 
> Previously it was possible for FUSE clients on machines with less than ~10 GB
> of RAM to exhaust the system-wide open file limit.  This is a denial of service
> attack against other processes running on the host.
> 
> This patch series updates the default RLIMIT_NOFILE calculation to take the
> fs.file-max sysctl value into account.  This solves the fs.file-max DoS.

Queued.

> Stefan Hajnoczi (2):
>   virtiofsd: add --rlimit-nofile=NUM option
>   virtiofsd: stay below fs.file-max sysctl value (CVE-2020-10717)
> 
>  tools/virtiofsd/fuse_lowlevel.h  |  1 +
>  tools/virtiofsd/helper.c         | 47 ++++++++++++++++++++++++++++++++
>  tools/virtiofsd/passthrough_ll.c | 22 ++++++---------
>  3 files changed, 56 insertions(+), 14 deletions(-)
> 
> -- 
> 2.25.3
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK