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From b99078ca40eb4fe9aca6f9bfbd5939cdbebd2aa4 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Wed, 31 Jul 2019 16:18:27 +0200
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Subject: [PATCH 186/189] libblkid: fix file descriptor leak in blkid_verify()
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The function blkid_verify() uses private device file descriptor and
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uses blkid_probe_set_device() to assign the descriptor to low-level
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probing code. Unfortunately, close() in this case is not enough as the
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prober can internally open whole-disk device too.
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The library API has been extended so blkid_probe_set_device()
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deallocates and close previously used prober for whole-disk. This new
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functionality is used in blkid_verify() now.
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1734545
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Upstream: http://github.com/karelzak/util-linux/commit/c4d6d1c54dcd0eff701236d396d88b1fc6251768
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libblkid/src/probe.c | 19 ++++++++++++++++---
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libblkid/src/verify.c | 4 +++-
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2 files changed, 19 insertions(+), 4 deletions(-)
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diff --git a/libblkid/src/probe.c b/libblkid/src/probe.c
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index ef0a72299..826ffa1c7 100644
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--- a/libblkid/src/probe.c
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+++ b/libblkid/src/probe.c
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@@ -653,10 +653,15 @@ int blkid_probe_is_cdrom(blkid_probe pr)
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* @off: begin of probing area
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* @size: size of probing area (zero means whole device/file)
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*
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- * Assigns the device to probe control struct, resets internal buffers and
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- * resets the current probing.
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+ * Assigns the device to probe control struct, resets internal buffers, resets
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+ * the current probing, and close previously associated device (if open by
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+ * libblkid).
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*
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- * Returns: -1 in case of failure, or 0 on success.
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+ * If @fd is < 0 than only resets the prober and returns 1. Note that
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+ * blkid_reset_probe() keeps the device associated with the prober, but
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+ * blkid_probe_set_device() does complete reset.
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+ *
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+ * Returns: -1 in case of failure, 0 on success and 1 on reset.
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*/
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int blkid_probe_set_device(blkid_probe pr, int fd,
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blkid_loff_t off, blkid_loff_t size)
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@@ -672,6 +677,11 @@ int blkid_probe_set_device(blkid_probe pr, int fd,
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if ((pr->flags & BLKID_FL_PRIVATE_FD) && pr->fd >= 0)
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close(pr->fd);
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+ if (pr->disk_probe) {
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+ blkid_free_probe(pr->disk_probe);
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+ pr->disk_probe = NULL;
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+ }
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+
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pr->flags &= ~BLKID_FL_PRIVATE_FD;
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pr->flags &= ~BLKID_FL_TINY_DEV;
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pr->flags &= ~BLKID_FL_CDROM_DEV;
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@@ -687,6 +697,9 @@ int blkid_probe_set_device(blkid_probe pr, int fd,
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pr->wipe_size = 0;
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pr->wipe_chain = NULL;
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+ if (fd < 0)
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+ return 1;
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+
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#if defined(POSIX_FADV_RANDOM) && defined(HAVE_POSIX_FADVISE)
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/* Disable read-ahead */
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posix_fadvise(fd, 0, 0, POSIX_FADV_RANDOM);
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diff --git a/libblkid/src/verify.c b/libblkid/src/verify.c
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index 2d64d97ca..d5c3592b6 100644
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--- a/libblkid/src/verify.c
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+++ b/libblkid/src/verify.c
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@@ -182,9 +182,11 @@ blkid_dev blkid_verify(blkid_cache cache, blkid_dev dev)
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dev->bid_name, (long long)st.st_rdev, dev->bid_type));
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}
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- blkid_reset_probe(cache->probe);
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+ /* reset prober */
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blkid_probe_reset_superblocks_filter(cache->probe);
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+ blkid_probe_set_device(cache->probe, -1, 0, 0);
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close(fd);
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+
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return dev;
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}
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--
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2.21.0
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