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57 lines
1.9 KiB
57 lines
1.9 KiB
From 6b36dc2a305af856af03aad2e315eea96a349153 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= <clg@redhat.com>
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Date: Thu, 21 Dec 2023 09:09:57 +0100
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Subject: [PATCH 061/101] vfio/iommufd: Remove the use of stat() to check file
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existence
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Eric Auger <eric.auger@redhat.com>
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RH-MergeRequest: 211: IOMMUFD backend backport
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RH-Jira: RHEL-19302 RHEL-21057
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RH-Acked-by: Cédric Le Goater <clg@redhat.com>
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RH-Acked-by: Sebastian Ott <sebott@redhat.com>
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RH-Commit: [60/67] 485770e45c1a6399780939bfb8b01b615d9213c6 (eauger1/centos-qemu-kvm)
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Using stat() before opening a file or a directory can lead to a
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time-of-check to time-of-use (TOCTOU) filesystem race, which is
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reported by coverity as a Security best practices violations. The
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sequence could be replaced by open and fdopendir but it doesn't add
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much in this case. Simply use opendir to avoid the race.
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Fixes: CID 1531551
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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Reviewed-by: Zhenzhong Duan <Zhenzhong.duan@intel.com>
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(cherry picked from commit 6ba254801f6bc7f3ef68a6414f1b107237c7eb26)
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Signed-off-by: Eric Auger <eric.auger@redhat.com>
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---
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hw/vfio/iommufd.c | 6 ------
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1 file changed, 6 deletions(-)
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diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
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index d4c586e842..9bfddc1360 100644
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--- a/hw/vfio/iommufd.c
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+++ b/hw/vfio/iommufd.c
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@@ -121,17 +121,11 @@ static int iommufd_cdev_getfd(const char *sysfs_path, Error **errp)
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DIR *dir = NULL;
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struct dirent *dent;
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gchar *contents;
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- struct stat st;
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gsize length;
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int major, minor;
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dev_t vfio_devt;
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path = g_strdup_printf("%s/vfio-dev", sysfs_path);
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- if (stat(path, &st) < 0) {
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- error_setg_errno(errp, errno, "no such host device");
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- goto out_free_path;
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- }
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-
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dir = opendir(path);
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if (!dir) {
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error_setg_errno(errp, errno, "couldn't open directory %s", path);
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--
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2.39.3
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