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[192.26.29.3]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e10af550sm100902365e9.1.2026.07.07.20.07.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Jul 2026 20:07:52 -0700 (PDT) From: Kumar Kartikeya Dwivedi To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann , Eduard Zingerman , Emil Tsalapatis , kkd@meta.com, kernel-team@meta.com Subject: [PATCH bpf-next v2 0/2] Fix for untrusted BTF pointer writes Date: Wed, 8 Jul 2026 05:07:49 +0200 Message-ID: <20260708030752.2503467-1-memxor@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=866; i=memxor@gmail.com; h=from:subject; bh=Lx6YXtUBcxGafUbQwHBxLUwSnMYXRJ9yj3fJU2MQvtM=; b=owGbwMvMwCXmrmtenRyi38x4Wi2JIct3310O7r4DNlYn13vcn3a2ZLlRcXb19+lMLQfOPpV/Y pF67NDZjlIWBjEuBlkxRZaS//uYjE9U/g60XcYNM4eVCWQIAxenAEwkMIGR4aBvkeH2tjmVmheb Nuxuu//+wDRRqVvL995f7THn+AG57HcM//1PO8YcqONLcJxfOXm9jazTz/NvZGfkW8lsSv+0Rfu BGzMA X-Developer-Key: i=memxor@gmail.com; a=openpgp; fpr=B34BD741DE8494B76E2F717880EF20021D46C59B Content-Transfer-Encoding: 8bit When using custom btf_struct_access() callbacks, we miss rejecting unstrusted BTF pointer writes. Fix and add a selftest for coverage. Changelog: ---------- v1 -> v2 v1: https://lore.kernel.org/bpf/20260707190214.1997705-1-memxor@gmail.com * Add missing fixes tag. * Add Amery's acks. Kumar Kartikeya Dwivedi (1): selftests/bpf: Add untrusted BTF write regression Nicholas Dudar (1): bpf: Reject writes through untrusted BTF pointers kernel/bpf/verifier.c | 8 ++++-- .../selftests/bpf/prog_tests/bpf_tcp_ca.c | 12 +++++++++ .../bpf/progs/tcp_ca_untrusted_btf_write.c | 26 +++++++++++++++++++ 3 files changed, 44 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/bpf/progs/tcp_ca_untrusted_btf_write.c base-commit: e909296d8750c9939ce311925ca1f59acb8944c1 -- 2.53.0