From: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
mainline inclusion
from mainline-v6.10-rc1
commit 7c55b78818cfb732680c4a72ab270cc2d2ee3d0f
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAD0FK
CVE: CVE-2024-40902
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?…
--------------------------------
When an xattr size is not what is expected, it is printed out to the
kernel log in hex format as a form of debugging. But when that xattr
size is bigger than the expected size, printing it out can cause an
access off the end of the buffer.
Fix this all up by properly restricting the size of the debug hex dump
in the kernel log.
Reported-by: syzbot+9dfe490c8176301c1d06(a)syzkaller.appspotmail.com
Cc: Dave Kleikamp <shaggy(a)kernel.org>
Link: https://lore.kernel.org/r/2024051433-slider-cloning-98f9@gregkh
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Signed-off-by: Xia Fukun <xiafukun(a)huawei.com>
---
fs/jfs/xattr.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/jfs/xattr.c b/fs/jfs/xattr.c
index a6797986b625..e8b12e708428 100644
--- a/fs/jfs/xattr.c
+++ b/fs/jfs/xattr.c
@@ -570,9 +570,11 @@ static int ea_get(struct inode *inode, struct ea_buffer *ea_buf, int min_size)
size_check:
if (EALIST_SIZE(ea_buf->xattr) != ea_size) {
+ int size = min_t(int, EALIST_SIZE(ea_buf->xattr), ea_size);
+
printk(KERN_ERR "ea_get: invalid extended attribute\n");
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_ADDRESS, 16, 1,
- ea_buf->xattr, ea_size, 1);
+ ea_buf->xattr, size, 1);
ea_release(inode, ea_buf);
rc = -EIO;
goto clean_up;
--
2.34.1
From: Daniel Borkmann <daniel(a)iogearbox.net>
stable inclusion
from stable-v6.6.41
commit 230bb13650b0f186f540500fd5f5f7096a822a2a
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/IADR5O
CVE: CVE-2024-41010
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id…
---------------------------
[ Upstream commit 1cb6f0bae50441f4b4b32a28315853b279c7404e ]
Pedro Pinto and later independently also Hyunwoo Kim and Wongi Lee reported
an issue that the tcx_entry can be released too early leading to a use
after free (UAF) when an active old-style ingress or clsact qdisc with a
shared tc block is later replaced by another ingress or clsact instance.
Essentially, the sequence to trigger the UAF (one example) can be as follows:
1. A network namespace is created
2. An ingress qdisc is created. This allocates a tcx_entry, and
&tcx_entry->miniq is stored in the qdisc's miniqp->p_miniq. At the
same time, a tcf block with index 1 is created.
3. chain0 is attached to the tcf block. chain0 must be connected to
the block linked to the ingress qdisc to later reach the function
tcf_chain0_head_change_cb_del() which triggers the UAF.
4. Create and graft a clsact qdisc. This causes the ingress qdisc
created in step 1 to be removed, thus freeing the previously linked
tcx_entry:
rtnetlink_rcv_msg()
=> tc_modify_qdisc()
=> qdisc_create()
=> clsact_init() [a]
=> qdisc_graft()
=> qdisc_destroy()
=> __qdisc_destroy()
=> ingress_destroy() [b]
=> tcx_entry_free()
=> kfree_rcu() // tcx_entry freed
5. Finally, the network namespace is closed. This registers the
cleanup_net worker, and during the process of releasing the
remaining clsact qdisc, it accesses the tcx_entry that was
already freed in step 4, causing the UAF to occur:
cleanup_net()
=> ops_exit_list()
=> default_device_exit_batch()
=> unregister_netdevice_many()
=> unregister_netdevice_many_notify()
=> dev_shutdown()
=> qdisc_put()
=> clsact_destroy() [c]
=> tcf_block_put_ext()
=> tcf_chain0_head_change_cb_del()
=> tcf_chain_head_change_item()
=> clsact_chain_head_change()
=> mini_qdisc_pair_swap() // UAF
There are also other variants, the gist is to add an ingress (or clsact)
qdisc with a specific shared block, then to replace that qdisc, waiting
for the tcx_entry kfree_rcu() to be executed and subsequently accessing
the current active qdisc's miniq one way or another.
The correct fix is to turn the miniq_active boolean into a counter. What
can be observed, at step 2 above, the counter transitions from 0->1, at
step [a] from 1->2 (in order for the miniq object to remain active during
the replacement), then in [b] from 2->1 and finally [c] 1->0 with the
eventual release. The reference counter in general ranges from [0,2] and
it does not need to be atomic since all access to the counter is protected
by the rtnl mutex. With this in place, there is no longer a UAF happening
and the tcx_entry is freed at the correct time.
Fixes: e420bed02507 ("bpf: Add fd-based tcx multi-prog infra with link support")
Reported-by: Pedro Pinto <xten(a)osec.io>
Co-developed-by: Pedro Pinto <xten(a)osec.io>
Signed-off-by: Pedro Pinto <xten(a)osec.io>
Signed-off-by: Daniel Borkmann <daniel(a)iogearbox.net>
Cc: Hyunwoo Kim <v4bel(a)theori.io>
Cc: Wongi Lee <qwerty(a)theori.io>
Cc: Martin KaFai Lau <martin.lau(a)kernel.org>
Link: https://lore.kernel.org/r/20240708133130.11609-1-daniel@iogearbox.net
Signed-off-by: Martin KaFai Lau <martin.lau(a)kernel.org>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
Signed-off-by: Liu Jian <liujian56(a)huawei.com>
---
include/net/tcx.h | 13 +++++++++----
net/sched/sch_ingress.c | 12 ++++++------
2 files changed, 15 insertions(+), 10 deletions(-)
diff --git a/include/net/tcx.h b/include/net/tcx.h
index 264f147953ba..a0f78fd5cb28 100644
--- a/include/net/tcx.h
+++ b/include/net/tcx.h
@@ -13,7 +13,7 @@ struct mini_Qdisc;
struct tcx_entry {
struct mini_Qdisc __rcu *miniq;
struct bpf_mprog_bundle bundle;
- bool miniq_active;
+ u32 miniq_active;
struct rcu_head rcu;
};
@@ -129,11 +129,16 @@ static inline void tcx_skeys_dec(bool ingress)
tcx_dec();
}
-static inline void tcx_miniq_set_active(struct bpf_mprog_entry *entry,
- const bool active)
+static inline void tcx_miniq_inc(struct bpf_mprog_entry *entry)
{
ASSERT_RTNL();
- tcx_entry(entry)->miniq_active = active;
+ tcx_entry(entry)->miniq_active++;
+}
+
+static inline void tcx_miniq_dec(struct bpf_mprog_entry *entry)
+{
+ ASSERT_RTNL();
+ tcx_entry(entry)->miniq_active--;
}
static inline bool tcx_entry_is_active(struct bpf_mprog_entry *entry)
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index a463a63192c3..8dde3548dc11 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -91,7 +91,7 @@ static int ingress_init(struct Qdisc *sch, struct nlattr *opt,
entry = tcx_entry_fetch_or_create(dev, true, &created);
if (!entry)
return -ENOMEM;
- tcx_miniq_set_active(entry, true);
+ tcx_miniq_inc(entry);
mini_qdisc_pair_init(&q->miniqp, sch, &tcx_entry(entry)->miniq);
if (created)
tcx_entry_update(dev, entry, true);
@@ -121,7 +121,7 @@ static void ingress_destroy(struct Qdisc *sch)
tcf_block_put_ext(q->block, sch, &q->block_info);
if (entry) {
- tcx_miniq_set_active(entry, false);
+ tcx_miniq_dec(entry);
if (!tcx_entry_is_active(entry)) {
tcx_entry_update(dev, NULL, true);
tcx_entry_free(entry);
@@ -256,7 +256,7 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
entry = tcx_entry_fetch_or_create(dev, true, &created);
if (!entry)
return -ENOMEM;
- tcx_miniq_set_active(entry, true);
+ tcx_miniq_inc(entry);
mini_qdisc_pair_init(&q->miniqp_ingress, sch, &tcx_entry(entry)->miniq);
if (created)
tcx_entry_update(dev, entry, true);
@@ -275,7 +275,7 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
entry = tcx_entry_fetch_or_create(dev, false, &created);
if (!entry)
return -ENOMEM;
- tcx_miniq_set_active(entry, true);
+ tcx_miniq_inc(entry);
mini_qdisc_pair_init(&q->miniqp_egress, sch, &tcx_entry(entry)->miniq);
if (created)
tcx_entry_update(dev, entry, false);
@@ -301,7 +301,7 @@ static void clsact_destroy(struct Qdisc *sch)
tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
if (ingress_entry) {
- tcx_miniq_set_active(ingress_entry, false);
+ tcx_miniq_dec(ingress_entry);
if (!tcx_entry_is_active(ingress_entry)) {
tcx_entry_update(dev, NULL, true);
tcx_entry_free(ingress_entry);
@@ -309,7 +309,7 @@ static void clsact_destroy(struct Qdisc *sch)
}
if (egress_entry) {
- tcx_miniq_set_active(egress_entry, false);
+ tcx_miniq_dec(egress_entry);
if (!tcx_entry_is_active(egress_entry)) {
tcx_entry_update(dev, NULL, false);
tcx_entry_free(egress_entry);
--
2.34.1