36 lines
1.1 KiB
Diff
36 lines
1.1 KiB
Diff
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From 939636dd664cc608232c272de77be96e6f089235 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Wed, 17 Oct 2012 11:43:39 +0200
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Subject: [PATCH 08/11] lib/loopdev: check for /sys
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The current loopdev code prefers /sys to get information about
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loop devices. The old methods like scan /dev are fallback solution
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only. Unfortunately, the code does not check if /sys is mounted.
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Addresses: http://blog.flameeyes.eu/2012/10/sophistication-can-be-bad
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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lib/loopdev.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/lib/loopdev.c b/lib/loopdev.c
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index 0e6033a..f62af83 100644
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--- a/lib/loopdev.c
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+++ b/lib/loopdev.c
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@@ -167,6 +167,12 @@ int loopcxt_init(struct loopdev_cxt *lc, int flags)
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if (rc)
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return rc;
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+ if (stat(_PATH_SYS_BLOCK, &st) || !S_ISDIR(st.st_mode)) {
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+ lc->flags |= LOOPDEV_FL_NOSYSFS;
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+ lc->flags &= ~LOOPDEV_FL_NOIOCTL;
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+ DBG(lc, loopdev_debug("init: disable /sys usage"));
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+ }
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+
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if (!(lc->flags & LOOPDEV_FL_NOSYSFS) &&
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get_linux_version() >= KERNEL_VERSION(2,6,37)) {
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/*
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--
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1.7.11.7
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