linux-kernel - [PATCH] sg_io: allow UNMAP and WRITE SAME without CAP_SYS

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 20 Jul 2012 18:30:01 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	axboe@...nel.dk, linux-scsi@...r.kernel.org
Subject: [PATCH] sg_io: allow UNMAP and WRITE SAME without CAP_SYS_RAWIO

These commands cannot be issued right now without giving CAP_SYS_RAWIO to
the process who wishes to send them.  These commands can be useful also to
non-privileged programs who have access to the block devices.  For example
a virtual machine monitor needs them to forward trim/discard to host disks.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 block/scsi_ioctl.c |    3 ++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 260fa80..dd71f18 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -168,13 +168,16 @@ static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
 	/* Basic writing commands */
 	__set_bit(WRITE_6, filter->write_ok);
 	__set_bit(WRITE_10, filter->write_ok);
+	__set_bit(WRITE_SAME, filter->write_ok);
 	__set_bit(WRITE_VERIFY, filter->write_ok);
 	__set_bit(WRITE_12, filter->write_ok);
 	__set_bit(WRITE_VERIFY_12, filter->write_ok);
 	__set_bit(WRITE_16, filter->write_ok);
+	__set_bit(WRITE_SAME_16, filter->write_ok);
 	__set_bit(WRITE_LONG, filter->write_ok);
 	__set_bit(WRITE_LONG_2, filter->write_ok);
 	__set_bit(ERASE, filter->write_ok);
+	__set_bit(UNMAP, filter->write_ok);
 	__set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
 	__set_bit(MODE_SELECT, filter->write_ok);
 	__set_bit(LOG_SELECT, filter->write_ok);
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/