This is a note to let you know that I've just added the patch titled
bpf: reject stores into ctx via st and xadd
to the 4.9-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:
bpf-reject-stores-into-ctx-via-st-and-xadd.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Mon Jan 29 13:22:08 CET 2018
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Date: Mon, 29 Jan 2018 02:49:01 +0100
Subject: bpf: reject stores into ctx via st and xadd
To: gregkh@xxxxxxxxxxxxxxxxxxx
Cc: ast@xxxxxxxxxx, stable@xxxxxxxxxxxxxxx, Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Message-ID: <bf502ba70d86b457adcbd695412af739a1d036f5.1517190207.git.daniel@xxxxxxxxxxxxx>
From: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
[ upstream commit f37a8cb84cce18762e8f86a70bd6a49a66ab964c ]
Alexei found that verifier does not reject stores into context
via BPF_ST instead of BPF_STX. And while looking at it, we
also should not allow XADD variant of BPF_STX.
The context rewriter is only assuming either BPF_LDX_MEM- or
BPF_STX_MEM-type operations, thus reject anything other than
that so that assumptions in the rewriter properly hold. Add
test cases as well for BPF selftests.
Fixes: d691f9e8d440 ("bpf: allow programs to write to certain skb fields")
Reported-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/bpf/verifier.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -702,6 +702,13 @@ static bool is_pointer_value(struct bpf_
return __is_pointer_value(env->allow_ptr_leaks, &env->cur_state.regs[regno]);
}
+static bool is_ctx_reg(struct bpf_verifier_env *env, int regno)
+{
+ const struct bpf_reg_state *reg = &env->cur_state.regs[regno];
+
+ return reg->type == PTR_TO_CTX;
+}
+
static int check_ptr_alignment(struct bpf_verifier_env *env,
struct bpf_reg_state *reg, int off, int size)
{
@@ -896,6 +903,12 @@ static int check_xadd(struct bpf_verifie
return -EACCES;
}
+ if (is_ctx_reg(env, insn->dst_reg)) {
+ verbose("BPF_XADD stores into R%d context is not allowed\n",
+ insn->dst_reg);
+ return -EACCES;
+ }
+
/* check whether atomic_add can read the memory */
err = check_mem_access(env, insn->dst_reg, insn->off,
BPF_SIZE(insn->code), BPF_READ, -1);
@@ -3012,6 +3025,12 @@ static int do_check(struct bpf_verifier_
if (err)
return err;
+ if (is_ctx_reg(env, insn->dst_reg)) {
+ verbose("BPF_ST stores into R%d context is not allowed\n",
+ insn->dst_reg);
+ return -EACCES;
+ }
+
/* check that memory (dst_reg + off) is writeable */
err = check_mem_access(env, insn->dst_reg, insn->off,
BPF_SIZE(insn->code), BPF_WRITE,
Patches currently in stable-queue which might be from daniel@xxxxxxxxxxxxx are
queue-4.9/bpf-avoid-false-sharing-of-map-refcount-with-max_entries.patch
queue-4.9/x86-bpf_jit-small-optimization-in-emit_bpf_tail_call.patch
queue-4.9/bpf-reject-stores-into-ctx-via-st-and-xadd.patch
queue-4.9/bpf-fix-32-bit-divide-by-zero.patch
queue-4.9/bpf-fix-bpf_tail_call-x64-jit.patch
queue-4.9/bpf-arsh-is-not-supported-in-32-bit-alu-thus-reject-it.patch
queue-4.9/bpf-fix-divides-by-zero.patch
queue-4.9/bpf-introduce-bpf_jit_always_on-config.patch