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Tue, 26 May 2026 08:42:10 -0700 (PDT) Received: from [127.0.1.1] ([2a01:4b00:f03c:ba00:3081:348a:50c4:2d80]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6d5c32esm35301088f8f.26.2026.05.26.08.42.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 May 2026 08:42:10 -0700 (PDT) From: Jamie Hill-Daniel X-Google-Original-From: Jamie Hill-Daniel Date: Tue, 26 May 2026 16:32:15 +0100 Subject: [PATCH RESEND 1/2] seccomp: Allow using `SECCOMP_MODE_STRICT` with `SECCOMP_MODE_FILTER` Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260526-seccomp-combined-v1-1-304b1cc3ad24@hill-daniel.co.uk> References: <20260526-seccomp-combined-v1-0-304b1cc3ad24@hill-daniel.co.uk> In-Reply-To: <20260526-seccomp-combined-v1-0-304b1cc3ad24@hill-daniel.co.uk> To: Kees Cook , Andy Lutomirski , Will Drewry , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, Jamie Hill-Daniel X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779810129; l=4298; i=jamie@hill-daniel.co.uk; s=20260302; h=from:subject:message-id; bh=K8dU5cRvEeTZJXIoWN4LezfaLkgzV+ajZ48AtGvjvPQ=; b=HGJCVl2+ue3fUdUIOetCI7AL4j49hWBcCqggcbL2wTWLAnBuSZ1TvlFXGh0NgvvMTmEdpqY+0 lZL083aCPQ5Bu5V98HtbrA5bzr165LOTvaI8Xlr4+A6a+RsQf1WWZW3 X-Developer-Key: i=jamie@hill-daniel.co.uk; a=ed25519; pk=ovqCXSlFUjrT82WuRtIuXB13U5n1yfxM6o0M5O5J2tA= It is currently impossible to enable `SECCOMP_MODE_STRICT` if `SECCOMP_MODE_FILTER` is enabled, and vice-versa. This makes using seccomp difficult in environments such as Docker, which installs a seccomp filter by default. Introduce a new internal `SECCOMP_MODE_COMBINED` that runs `strict` checks, followed by any installed filters. Link: https://github.com/moby/moby/issues/42082 Signed-off-by: Jamie Hill-Daniel --- kernel/seccomp.c | 46 ++++++++++++++++++++++++++-------------------- 1 file changed, 26 insertions(+), 20 deletions(-) diff --git a/kernel/seccomp.c b/kernel/seccomp.c index 25f62867a16d..8201a050d358 100644 --- a/kernel/seccomp.c +++ b/kernel/seccomp.c @@ -33,6 +33,8 @@ =20 /* Not exposed in headers: strictly internal use only. */ #define SECCOMP_MODE_DEAD (SECCOMP_MODE_FILTER + 1) +/* Run SECCOMP_MODE_STRICT checks, followed by SECCOMP_MODE_FILTER */ +#define SECCOMP_MODE_COMBINED (SECCOMP_MODE_DEAD + 1) =20 #ifdef CONFIG_SECCOMP_FILTER #include @@ -432,14 +434,21 @@ static u32 seccomp_run_filters(const struct seccomp_d= ata *sd, } #endif /* CONFIG_SECCOMP_FILTER */ =20 -static inline bool seccomp_may_assign_mode(unsigned long seccomp_mode) +/** + * seccomp_needs_combined: internal function for checking if requested mode + * needs to be upgraded to `SECCOMP_MODE_COMBINED`. + * + */ +static inline bool seccomp_needs_combined(unsigned long seccomp_mode) { assert_spin_locked(¤t->sighand->siglock); =20 - if (current->seccomp.mode && current->seccomp.mode !=3D seccomp_mode) - return false; + if ((current->seccomp.mode =3D=3D SECCOMP_MODE_STRICT || + current->seccomp.mode =3D=3D SECCOMP_MODE_FILTER) && + current->seccomp.mode !=3D seccomp_mode) + return true; =20 - return true; + return false; } =20 void __weak arch_seccomp_spec_mitigate(struct task_struct *task) { } @@ -1407,6 +1416,9 @@ int __secure_computing(void) WARN_ON_ONCE(1); do_exit(SIGKILL); return -1; + case SECCOMP_MODE_COMBINED: + __secure_computing_strict(this_syscall); + return __seccomp_filter(this_syscall, false); default: BUG(); } @@ -1421,30 +1433,23 @@ long prctl_get_seccomp(void) /** * seccomp_set_mode_strict: internal function for setting strict seccomp * - * Once current->seccomp.mode is non-zero, it may not be changed. + * Once current->seccomp.mode is non-zero, it may only be changed to `COMB= INED` or `DEAD`. * - * Returns 0 on success or -EINVAL on failure. */ -static long seccomp_set_mode_strict(void) +static void seccomp_set_mode_strict(void) { - const unsigned long seccomp_mode =3D SECCOMP_MODE_STRICT; - long ret =3D -EINVAL; + unsigned long seccomp_mode =3D SECCOMP_MODE_STRICT; =20 spin_lock_irq(¤t->sighand->siglock); =20 - if (!seccomp_may_assign_mode(seccomp_mode)) - goto out; + if (seccomp_needs_combined(seccomp_mode)) + seccomp_mode =3D SECCOMP_MODE_COMBINED; =20 #ifdef TIF_NOTSC disable_TSC(); #endif seccomp_assign_mode(current, seccomp_mode, 0); - ret =3D 0; - -out: spin_unlock_irq(¤t->sighand->siglock); - - return ret; } =20 #ifdef CONFIG_SECCOMP_FILTER @@ -1956,7 +1961,7 @@ static bool has_duplicate_listener(struct seccomp_fil= ter *new_child) static long seccomp_set_mode_filter(unsigned int flags, const char __user *filter) { - const unsigned long seccomp_mode =3D SECCOMP_MODE_FILTER; + long seccomp_mode =3D SECCOMP_MODE_FILTER; struct seccomp_filter *prepared =3D NULL; long ret =3D -EINVAL; int listener =3D -1; @@ -2016,8 +2021,8 @@ static long seccomp_set_mode_filter(unsigned int flag= s, =20 spin_lock_irq(¤t->sighand->siglock); =20 - if (!seccomp_may_assign_mode(seccomp_mode)) - goto out; + if (seccomp_needs_combined(seccomp_mode)) + seccomp_mode =3D SECCOMP_MODE_COMBINED; =20 if (has_duplicate_listener(prepared)) { ret =3D -EBUSY; @@ -2105,7 +2110,8 @@ static long do_seccomp(unsigned int op, unsigned int = flags, case SECCOMP_SET_MODE_STRICT: if (flags !=3D 0 || uargs !=3D NULL) return -EINVAL; - return seccomp_set_mode_strict(); + seccomp_set_mode_strict(); + return 0; case SECCOMP_SET_MODE_FILTER: return seccomp_set_mode_filter(flags, uargs); case SECCOMP_GET_ACTION_AVAIL: --=20 2.54.0 From nobody Mon Jun 8 20:54:06 2026 Received: from mail-wr1-f47.google.com (mail-wr1-f47.google.com [209.85.221.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B13383793B3 for ; Tue, 26 May 2026 15:42:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.47 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779810136; 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Tue, 26 May 2026 08:42:11 -0700 (PDT) Received: from [127.0.1.1] ([2a01:4b00:f03c:ba00:3081:348a:50c4:2d80]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6d5c32esm35301088f8f.26.2026.05.26.08.42.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 May 2026 08:42:11 -0700 (PDT) From: Jamie Hill-Daniel X-Google-Original-From: Jamie Hill-Daniel Date: Tue, 26 May 2026 16:32:16 +0100 Subject: [PATCH RESEND 2/2] selftest: seccomp: Adjust test for using both `STRICT` and `FILTER` Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260526-seccomp-combined-v1-2-304b1cc3ad24@hill-daniel.co.uk> References: <20260526-seccomp-combined-v1-0-304b1cc3ad24@hill-daniel.co.uk> In-Reply-To: <20260526-seccomp-combined-v1-0-304b1cc3ad24@hill-daniel.co.uk> To: Kees Cook , Andy Lutomirski , Will Drewry , Shuah Khan Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, bpf@vger.kernel.org, Jamie Hill-Daniel X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1779810129; l=1026; i=jamie@hill-daniel.co.uk; s=20260302; h=from:subject:message-id; bh=IhTA4SRq4kxztkMEQE6gGj3QktcRDsLFW6PL05IOesQ=; b=ightoZdPjxZef0wn/Yq84Wlb6EYSPnq7FFX3ME8HJemLgnVNUpHJ23+bgSpdzhF+XYsH4N3/v sgNM06OSdNlD8NNSiHlHKsBkymYc5cQNfIOtFpoaPraznMsNhpjnnSU X-Developer-Key: i=jamie@hill-daniel.co.uk; a=ed25519; pk=ovqCXSlFUjrT82WuRtIuXB13U5n1yfxM6o0M5O5J2tA= This test previously tested that applying `STRICT` after `FILTER` is impossible - update it to test that it is now possible. Signed-off-by: Jamie Hill-Daniel --- tools/testing/selftests/seccomp/seccomp_bpf.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/seccomp/seccomp_bpf.c b/tools/testing/= selftests/seccomp/seccomp_bpf.c index 874f17763536..ba042828dcbd 100644 --- a/tools/testing/selftests/seccomp/seccomp_bpf.c +++ b/tools/testing/selftests/seccomp/seccomp_bpf.c @@ -516,7 +516,7 @@ TEST(filter_chain_limits) } } =20 -TEST(mode_filter_cannot_move_to_strict) +TEST(mode_filter_combined) { struct sock_filter filter[] =3D { BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), @@ -534,8 +534,7 @@ TEST(mode_filter_cannot_move_to_strict) ASSERT_EQ(0, ret); =20 ret =3D prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0); - EXPECT_EQ(-1, ret); - EXPECT_EQ(EINVAL, errno); + ASSERT_EQ(0, ret); } =20 =20 --=20 2.54.0