diff options
Diffstat (limited to 'sys-libs/libseccomp/files/libseccomp-2.5.5-aliasing.patch')
| -rw-r--r-- | sys-libs/libseccomp/files/libseccomp-2.5.5-aliasing.patch | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/sys-libs/libseccomp/files/libseccomp-2.5.5-aliasing.patch b/sys-libs/libseccomp/files/libseccomp-2.5.5-aliasing.patch new file mode 100644 index 000000000000..60190702d381 --- /dev/null +++ b/sys-libs/libseccomp/files/libseccomp-2.5.5-aliasing.patch @@ -0,0 +1,30 @@ +https://github.com/seccomp/libseccomp/commit/2847f10dddca72167309c04cd09f326fd3b78e2f + +From 2847f10dddca72167309c04cd09f326fd3b78e2f Mon Sep 17 00:00:00 2001 +From: Sam James <sam@gentoo.org> +Date: Sun, 24 Dec 2023 20:38:06 +0100 +Subject: [PATCH] scmp_bpf_sim: fix aliasing UB + +See https://github.com/seccomp/libseccomp/pull/425. + +Punning sys_data_b between uint32_t* and struct* seccomp_data isn't legal, +use memcpy to fix the testsuite with Clang 17. + +Modern compilers recognise this idiom and optimise it out anyway. + +Signed-off-by: Sam James <sam@gentoo.org> +Acked-by: Tom Hromatka <tom.hromatka@oracle.com> +Signed-off-by: Paul Moore <paul@paul-moore.com> +--- a/tools/scmp_bpf_sim.c ++++ b/tools/scmp_bpf_sim.c +@@ -182,7 +182,8 @@ static void bpf_execute(const struct bpf_program *prg, + switch (code) { + case BPF_LD+BPF_W+BPF_ABS: + if (k < BPF_SYSCALL_MAX) { +- uint32_t val = *((uint32_t *)&sys_data_b[k]); ++ uint32_t val; ++ memcpy(&val, &sys_data_b[k], sizeof(val)); + state.acc = ttoh32(arch, val); + } else + exit_error(ERANGE, ip_c); + |