[8.19] Reject non-native ABIs in ML seccomp BPF filter (#3080)#3106
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* Reject non-native ABIs in ML seccomp BPF filter The Linux seccomp filter matched only on seccomp_data.nr, so an x86_64 process could issue int 0x80 (i386) and hit number collisions — notably i386 socketcall (102) vs allowlisted x86_64 getuid (102). That opened a socket surface the policy intended to block (elastic/security#12621). Require seccomp_data.arch to match the native ABI (AUDIT_ARCH_X86_64 / AUDIT_ARCH_AARCH64) with an immediate deny on mismatch, before any nr allowlist matching. The arch check is self-contained so existing relative jump offsets in the nr allowlist are unchanged. Co-authored-by: Cursor <[email protected]> * Add changelog for #3080 Co-authored-by: Cursor <[email protected]> * Address Copilot review on seccomp arch gate Use offsetof for seccomp_data field loads and add an x86_64-only int 0x80 denial test, soft-skipped when IA32 emulation is unavailable. Co-authored-by: Cursor <[email protected]> * [ML] Address remaining Copilot review comments on seccomp arch gate - Fix spelling in CSystemCallFilter.h doc comment (macOS, restrict/restricted). - Declare the 'cc' clobber on the int $0x80 i386-ABI probe asm, since the syscall entry path may modify the condition-code flags. Co-authored-by: Cursor <[email protected]> * [ML] Address Copilot review on seccomp arch-gate test/docs - Use plain // comments (not Doxygen //! / \p) in the .cc test file. - Zero the i386 argument registers (ebx/ecx/edx/esi/edi) in the int $0x80 probes so they are deterministic and side-effect free in the failure mode. - Harden the IA32 detection: a compat entry that returns -ENOSYS (stubbed, not truly usable) now skips the assertion instead of failing. - Fix the run-on DESCRIPTION sentence in the header. Co-authored-by: Cursor <[email protected]> * [ML] Remove public-to-private security-tracker references Co-authored-by: Cursor <[email protected]> --------- Co-authored-by: Cursor <[email protected]> (cherry picked from commit 184a65a)
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Clean automated backport of an already-reviewed, approved change. Approving so auto-merge can complete.
This was referenced Jul 24, 2026
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