The patch titled
Subject: autofs: fix slab out of bounds read in getname_kernel()
has been removed from the -mm tree. Its filename was
autofs-fix-slab-out-of-bounds-read-in-getname_kernel.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Tomas Bortoli <tomasbortoli@xxxxxxxxx>
Subject: autofs: fix slab out of bounds read in getname_kernel()
The autofs subsystem does not check that the "path" parameter is
present for all cases where it is required when it is passed in via the
"param" struct.
In particular it isn't checked for the AUTOFS_DEV_IOCTL_OPENMOUNT_CMD
ioctl command.
To solve it, modify validate_dev_ioctl(function to check that a path
has been provided for ioctl commands that require it.
Link: http://lkml.kernel.org/r/153060031527.26631.18306637892746301555.stgit@xxxxxxxxxxxxxxxx
Signed-off-by: Tomas Bortoli <tomasbortoli@xxxxxxxxx>
Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
Reported-by: syzbot+60c837b428dc84e83a93@xxxxxxxxxxxxxxxxxxxxxxxxx
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/autofs/dev-ioctl.c | 22 +++++++++++++---------
1 file changed, 13 insertions(+), 9 deletions(-)
diff -puN fs/autofs/dev-ioctl.c~autofs-fix-slab-out-of-bounds-read-in-getname_kernel fs/autofs/dev-ioctl.c
--- a/fs/autofs/dev-ioctl.c~autofs-fix-slab-out-of-bounds-read-in-getname_kernel
+++ a/fs/autofs/dev-ioctl.c
@@ -135,6 +135,15 @@ static int validate_dev_ioctl(int cmd, s
cmd);
goto out;
}
+ } else {
+ unsigned int inr = _IOC_NR(cmd);
+
+ if (inr == AUTOFS_DEV_IOCTL_OPENMOUNT_CMD ||
+ inr == AUTOFS_DEV_IOCTL_REQUESTER_CMD ||
+ inr == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD) {
+ err = -EINVAL;
+ goto out;
+ }
}
err = 0;
@@ -271,7 +280,8 @@ static int autofs_dev_ioctl_openmount(st
dev_t devid;
int err, fd;
- /* param->path has already been checked */
+ /* param->path has been checked in validate_dev_ioctl() */
+
if (!param->openmount.devid)
return -EINVAL;
@@ -433,10 +443,7 @@ static int autofs_dev_ioctl_requester(st
dev_t devid;
int err = -ENOENT;
- if (param->size <= AUTOFS_DEV_IOCTL_SIZE) {
- err = -EINVAL;
- goto out;
- }
+ /* param->path has been checked in validate_dev_ioctl() */
devid = sbi->sb->s_dev;
@@ -521,10 +528,7 @@ static int autofs_dev_ioctl_ismountpoint
unsigned int devid, magic;
int err = -ENOENT;
- if (param->size <= AUTOFS_DEV_IOCTL_SIZE) {
- err = -EINVAL;
- goto out;
- }
+ /* param->path has been checked in validate_dev_ioctl() */
name = param->path;
type = param->ismountpoint.in.type;
_
Patches currently in -mm which might be from tomasbortoli@xxxxxxxxx are
version-pointer-uninitialized.patch
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