This is a note to let you know that I've just added the patch titled
ext4: Fix function prototype mismatch for ext4_feat_ktype
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-fix-function-prototype-mismatch-for-ext4_feat_ktype.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 118901ad1f25d2334255b3d50512fa20591531cd Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Wed, 4 Jan 2023 13:09:12 -0800
Subject: ext4: Fix function prototype mismatch for ext4_feat_ktype
From: Kees Cook <keescook@xxxxxxxxxxxx>
commit 118901ad1f25d2334255b3d50512fa20591531cd upstream.
With clang's kernel control flow integrity (kCFI, CONFIG_CFI_CLANG),
indirect call targets are validated against the expected function
pointer prototype to make sure the call target is valid to help mitigate
ROP attacks. If they are not identical, there is a failure at run time,
which manifests as either a kernel panic or thread getting killed.
ext4_feat_ktype was setting the "release" handler to "kfree", which
doesn't have a matching function prototype. Add a simple wrapper
with the correct prototype.
This was found as a result of Clang's new -Wcast-function-type-strict
flag, which is more sensitive than the simpler -Wcast-function-type,
which only checks for type width mismatches.
Note that this code is only reached when ext4 is a loadable module and
it is being unloaded:
CFI failure at kobject_put+0xbb/0x1b0 (target: kfree+0x0/0x180; expected type: 0x7c4aa698)
...
RIP: 0010:kobject_put+0xbb/0x1b0
...
Call Trace:
<TASK>
ext4_exit_sysfs+0x14/0x60 [ext4]
cleanup_module+0x67/0xedb [ext4]
Fixes: b99fee58a20a ("ext4: create ext4_feat kobject dynamically")
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Build-tested-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>
Reviewed-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230103234616.never.915-kees@xxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230104210908.gonna.388-kees@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ext4/sysfs.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/fs/ext4/sysfs.c
+++ b/fs/ext4/sysfs.c
@@ -349,6 +349,11 @@ static void ext4_sb_release(struct kobje
complete(&sbi->s_kobj_unregister);
}
+static void ext4_feat_release(struct kobject *kobj)
+{
+ kfree(kobj);
+}
+
static const struct sysfs_ops ext4_attr_ops = {
.show = ext4_attr_show,
.store = ext4_attr_store,
@@ -363,7 +368,7 @@ static struct kobj_type ext4_sb_ktype =
static struct kobj_type ext4_feat_ktype = {
.default_attrs = ext4_feat_attrs,
.sysfs_ops = &ext4_attr_ops,
- .release = (void (*)(struct kobject *))kfree,
+ .release = ext4_feat_release,
};
static struct kobject *ext4_root;
Patches currently in stable-queue which might be from keescook@xxxxxxxxxxxx are
queue-4.19/ext4-fix-function-prototype-mismatch-for-ext4_feat_ktype.patch
