Re: [PATCH v3 0/2] add per-device sysfs knob to enable unrestricted,unprivileged SG_IO

From: Paolo Bonzini
Date: Mon Dec 17 2012 - 09:27:46 EST

Il 13/11/2012 18:25, Paolo Bonzini ha scritto:
> Privilege restrictions for SG_IO right now apply without distinction to
> all devices, based on the single capability CAP_SYS_RAWIO. This is a very
> broad capability, and makes it difficult to give SG_IO access to trusted
> clients that need access to persistent reservations, trim/discard, or
> vendor-specific commands. One problem here is that CAP_SYS_RAWIO allows
> to escape a partition and issue commands that affect the full disk,
> thus making DAC almost useless.
> For simplicity, this series attempts to solve one case only: you want
> to pass through almost everything, but still run as confined as possible.
> This is for example the case for virtualization, where more complex
> filtering can be done just as easily in userspace, in the virtual
> machine monitor. (This does mean the filter can be subverted if the
> guest can escape the QEMU jail, but a more generic approach involving
> a bitmap was NACKed).
> Ok for 3.8?

Ping... Jens, I haven't seen any pull request for 3.8 from you. Are
these patches on your radar? Tejun acked both of them.


> v2->v3: change bitmap filter to boolean
> Paolo Bonzini (2):
> sg_io: pass request_queue to blk_verify_command
> sg_io: introduce unpriv_sgio queue flag
> block/blk-sysfs.c | 32 ++++++++++++++++++++++++++++++++
> block/bsg.c | 2 +-
> block/scsi_ioctl.c | 9 +++++----
> drivers/scsi/sg.c | 3 ++-
> include/linux/blkdev.h | 6 +++++-
> 5 files changed, 45 insertions(+), 7 deletions(-)

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