kbuild: rust: keep Rust objects out of Clang LTO with inline helpersgrafted

Under `CONFIG_LTO_CLANG` + `CONFIG_RUST_INLINE_HELPERS`, one may hit
`objtool` errors such as:

    vmlinux.o: error: objtool: _R..._3Gsp4boot+0xd6a:
    can't find jump dest instruction at .text._R..._3Gsp4boot+0x1dfd

The reason is that in such builds, the Clang invocation that compiles
the combined Rust plus helpers bitcode emits LLVM bitcode (again) --
the final code generation happens in the linker's LTO step, which the
`-mllvm` trap options passed to Clang do not reach.

This, in turn, means that unreachable traps are missing, and the
impossible paths do not merely fallthrough to the next symbol, but past
the end of their own section, since LTO builds place each function in
its own section.

Thus filter `CC_FLAGS_LTO` out of the Clang invocation, so that it always
emits machine code directly, with the traps in place.

Assisted-by: LLM
Cc: Gary Guo <gary@garyguo.net>
Cc: Boqun Feng <boqun@kernel.org>
Cc: Alice Ryhl <aliceryhl@google.com>
Cc: Matthew Maurer <mmaurer@google.com>
Cc: Josh Poimboeuf <jpoimboe@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: stable@vger.kernel.org
Fixes: 3a2486cc1da5 ("kbuild: rust: provide an option to inline C helpers into Rust")
Acked-by: Gary Guo <gary@garyguo.net>
Link: https://patch.msgid.link/20260816133233.197500-2-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

1 files changed, 290 insertions, 0 deletions

diff --git a/lib/crypto/tests/sha384-testvecs.h b/lib/crypto/tests/sha384-testvecs.h
new file mode 100644
index 000000000..6e2f572dd
--- /dev/null
+++ b/lib/crypto/tests/sha384-testvecs.h
@@ -0,0 +1,290 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* This file was generated by: ./scripts/crypto/gen-hash-testvecs.py sha384 */
+
+static const struct {
+	size_t data_len;
+	u8 digest[SHA384_DIGEST_SIZE];
+} hash_testvecs[] = {
+	{
+		.data_len = 0,
+		.digest = {
+			0x38, 0xb0, 0x60, 0xa7, 0x51, 0xac, 0x96, 0x38,
+			0x4c, 0xd9, 0x32, 0x7e, 0xb1, 0xb1, 0xe3, 0x6a,
+			0x21, 0xfd, 0xb7, 0x11, 0x14, 0xbe, 0x07, 0x43,
+			0x4c, 0x0c, 0xc7, 0xbf, 0x63, 0xf6, 0xe1, 0xda,
+			0x27, 0x4e, 0xde, 0xbf, 0xe7, 0x6f, 0x65, 0xfb,
+			0xd5, 0x1a, 0xd2, 0xf1, 0x48, 0x98, 0xb9, 0x5b,
+		},
+	},
+	{
+		.data_len = 1,
+		.digest = {
+			0x07, 0x34, 0x9d, 0x74, 0x48, 0x76, 0xa5, 0x72,
+			0x78, 0x02, 0xb8, 0x6e, 0x21, 0x59, 0xb0, 0x75,
+			0x09, 0x68, 0x11, 0x39, 0x53, 0x61, 0xee, 0x8d,
+			0xf2, 0x01, 0xf3, 0x90, 0x53, 0x7c, 0xd3, 0xde,
+			0x13, 0x9f, 0xd2, 0x74, 0x28, 0xfe, 0xe1, 0xc8,
+			0x2e, 0x95, 0xc6, 0x7d, 0x69, 0x4d, 0x04, 0xc6,
+		},
+	},
+	{
+		.data_len = 2,
+		.digest = {
+			0xc4, 0xef, 0x6e, 0x8c, 0x19, 0x1c, 0xaa, 0x0e,
+			0x86, 0xf2, 0x68, 0xa1, 0xa0, 0x2d, 0x2e, 0xb2,
+			0x84, 0xbc, 0x5d, 0x53, 0x31, 0xf8, 0x03, 0x75,
+			0x56, 0xf4, 0x8b, 0x23, 0x1a, 0x68, 0x15, 0x9a,
+			0x60, 0xb2, 0xec, 0x05, 0xe1, 0xd4, 0x5e, 0x9e,
+			0xe8, 0x7c, 0x9d, 0xe4, 0x0f, 0x9c, 0x3a, 0xdd,
+		},
+	},
+	{
+		.data_len = 3,
+		.digest = {
+			0x29, 0xd2, 0x02, 0xa2, 0x77, 0x24, 0xc7, 0xa7,
+			0x23, 0x0c, 0x3e, 0x30, 0x56, 0x47, 0xdb, 0x75,
+			0xd4, 0x41, 0xf8, 0xb3, 0x8e, 0x26, 0xf6, 0x92,
+			0xbc, 0x20, 0x2e, 0x96, 0xcc, 0x81, 0x5f, 0x32,
+			0x82, 0x60, 0xe2, 0xcf, 0x23, 0xd7, 0x3c, 0x90,
+			0xb2, 0x56, 0x8f, 0xb6, 0x0f, 0xf0, 0x6b, 0x80,
+		},
+	},
+	{
+		.data_len = 16,
+		.digest = {
+			0x21, 0x4c, 0xac, 0xfe, 0xbd, 0x40, 0x74, 0x1f,
+			0xa2, 0x2d, 0x2f, 0x35, 0x91, 0xfd, 0xc9, 0x97,
+			0x88, 0x12, 0x6c, 0x0c, 0x6e, 0xd8, 0x50, 0x0b,
+			0x4b, 0x2c, 0x89, 0xa6, 0xa6, 0x4a, 0xad, 0xd7,
+			0x72, 0x62, 0x2c, 0x62, 0x81, 0xcd, 0x24, 0x74,
+			0xf5, 0x44, 0x05, 0xa0, 0x97, 0xea, 0xf1, 0x78,
+		},
+	},
+	{
+		.data_len = 32,
+		.digest = {
+			0x06, 0x8b, 0x92, 0x9f, 0x8b, 0x64, 0xb2, 0x80,
+			0xde, 0xcc, 0xde, 0xc3, 0x2f, 0x22, 0x27, 0xe8,
+			0x3b, 0x6e, 0x16, 0x21, 0x14, 0x81, 0xbe, 0x5b,
+			0xa7, 0xa7, 0x14, 0x8a, 0x00, 0x8f, 0x0d, 0x38,
+			0x11, 0x63, 0xe8, 0x3e, 0xb9, 0xf1, 0xcf, 0x87,
+			0xb1, 0x28, 0xe5, 0xa1, 0x89, 0xa8, 0x7a, 0xde,
+		},
+	},
+	{
+		.data_len = 48,
+		.digest = {
+			0x9e, 0x37, 0x76, 0x62, 0x98, 0x39, 0xbe, 0xfd,
+			0x2b, 0x91, 0x20, 0x54, 0x8f, 0x21, 0xe7, 0x30,
+			0x0a, 0x01, 0x7a, 0x65, 0x0b, 0xc9, 0xb3, 0x89,
+			0x3c, 0xb6, 0xd3, 0xa8, 0xff, 0xc9, 0x1b, 0x5c,
+			0xd4, 0xac, 0xb4, 0x7e, 0xba, 0x94, 0xc3, 0x8a,
+			0x26, 0x41, 0xf6, 0xd5, 0xed, 0x6f, 0x27, 0xa7,
+		},
+	},
+	{
+		.data_len = 49,
+		.digest = {
+			0x03, 0x1f, 0xef, 0x5a, 0x16, 0x28, 0x78, 0x10,
+			0x29, 0xe8, 0xe2, 0xe4, 0x84, 0x36, 0x19, 0x10,
+			0xaa, 0xea, 0xde, 0x06, 0x39, 0x5f, 0xb2, 0x36,
+			0xca, 0x24, 0x4f, 0x7b, 0x66, 0xf7, 0xe7, 0x31,
+			0xf3, 0x9b, 0x74, 0x1e, 0x17, 0x20, 0x88, 0x62,
+			0x50, 0xeb, 0x5f, 0x9a, 0xa7, 0x2c, 0xf4, 0xc9,
+		},
+	},
+	{
+		.data_len = 63,
+		.digest = {
+			0x10, 0xce, 0xed, 0x26, 0xb8, 0xac, 0xc1, 0x1b,
+			0xe6, 0xb9, 0xeb, 0x7c, 0xae, 0xcd, 0x55, 0x5a,
+			0x20, 0x2a, 0x7b, 0x43, 0xe6, 0x3e, 0xf0, 0x3f,
+			0xd9, 0x2f, 0x8c, 0x52, 0xe2, 0xf0, 0xb6, 0x24,
+			0x2e, 0xa4, 0xac, 0x24, 0x3a, 0x54, 0x99, 0x71,
+			0x65, 0xab, 0x97, 0x2d, 0xb6, 0xe6, 0x94, 0x20,
+		},
+	},
+	{
+		.data_len = 64,
+		.digest = {
+			0x24, 0x6d, 0x9f, 0x59, 0x42, 0x36, 0xca, 0x34,
+			0x36, 0x41, 0xa2, 0xcd, 0x69, 0xdf, 0x3d, 0xcb,
+			0x64, 0x94, 0x54, 0xb2, 0xed, 0xc1, 0x1c, 0x31,
+			0xe3, 0x26, 0xcb, 0x71, 0xe6, 0x98, 0xb2, 0x56,
+			0x74, 0x30, 0xa9, 0x15, 0x98, 0x9d, 0xb3, 0x07,
+			0xcc, 0xa8, 0xcc, 0x6f, 0x42, 0xb0, 0x9d, 0x2b,
+		},
+	},
+	{
+		.data_len = 65,
+		.digest = {
+			0x85, 0x1f, 0xbc, 0x5e, 0x2a, 0x00, 0x7d, 0xc2,
+			0x21, 0x4c, 0x28, 0x14, 0xc5, 0xd8, 0x0c, 0xe8,
+			0x55, 0xa5, 0xa0, 0x77, 0xda, 0x8f, 0xce, 0xd4,
+			0xf0, 0xcb, 0x30, 0xb8, 0x9c, 0x47, 0xe1, 0x33,
+			0x92, 0x18, 0xc5, 0x1f, 0xf2, 0xef, 0xb5, 0xe5,
+			0xbc, 0x63, 0xa6, 0xe5, 0x9a, 0xc9, 0xcc, 0xf1,
+		},
+	},
+	{
+		.data_len = 127,
+		.digest = {
+			0x26, 0xd2, 0x4c, 0xb6, 0xce, 0xd8, 0x22, 0x2b,
+			0x44, 0x10, 0x6f, 0x59, 0xf7, 0x0d, 0xb9, 0x3f,
+			0x7d, 0x29, 0x75, 0xf1, 0x71, 0xb2, 0x71, 0x23,
+			0xef, 0x68, 0xb7, 0x25, 0xae, 0xb8, 0x45, 0xf8,
+			0xa3, 0xb2, 0x2d, 0x7a, 0x83, 0x0a, 0x05, 0x61,
+			0xbc, 0x73, 0xf1, 0xf9, 0xba, 0xfb, 0x3d, 0xc2,
+		},
+	},
+	{
+		.data_len = 128,
+		.digest = {
+			0x7c, 0xe5, 0x7f, 0x5e, 0xea, 0xd9, 0x7e, 0x54,
+			0x14, 0x30, 0x6f, 0x37, 0x02, 0x71, 0x0f, 0xf1,
+			0x14, 0x16, 0xfa, 0xeb, 0x6e, 0x1e, 0xf0, 0xbe,
+			0x10, 0xed, 0x01, 0xbf, 0xa0, 0x9d, 0xcb, 0x07,
+			0x5f, 0x8b, 0x7f, 0x44, 0xe1, 0xd9, 0x13, 0xf0,
+			0x29, 0xa2, 0x54, 0x32, 0xd9, 0xb0, 0x69, 0x69,
+		},
+	},
+	{
+		.data_len = 129,
+		.digest = {
+			0xc5, 0x54, 0x1f, 0xcb, 0x9d, 0x8f, 0xdf, 0xbf,
+			0xab, 0x55, 0x92, 0x1d, 0x3b, 0x93, 0x79, 0x26,
+			0xdf, 0xba, 0x9a, 0x28, 0xff, 0xa0, 0x6c, 0xae,
+			0x7b, 0x53, 0x8d, 0xfa, 0xef, 0x35, 0x88, 0x19,
+			0x16, 0xb8, 0x72, 0x86, 0x76, 0x2a, 0xf5, 0xe6,
+			0xec, 0xb2, 0xd7, 0xd4, 0xbe, 0x1a, 0xe4, 0x9f,
+		},
+	},
+	{
+		.data_len = 256,
+		.digest = {
+			0x74, 0x9d, 0x77, 0xfb, 0xe8, 0x0f, 0x0c, 0x2d,
+			0x86, 0x0d, 0x49, 0xea, 0x2b, 0xd0, 0x13, 0xd1,
+			0xe8, 0xb8, 0xe1, 0xa3, 0x7b, 0x48, 0xab, 0x6a,
+			0x21, 0x2b, 0x4c, 0x48, 0x32, 0xb5, 0xdc, 0x31,
+			0x7f, 0xd0, 0x32, 0x67, 0x9a, 0xc0, 0x85, 0x53,
+			0xef, 0xe9, 0xfb, 0xe1, 0x8b, 0xd8, 0xcc, 0xc2,
+		},
+	},
+	{
+		.data_len = 511,
+		.digest = {
+			0x7b, 0xa9, 0xde, 0xa3, 0x07, 0x5c, 0x4c, 0xaa,
+			0x31, 0xc6, 0x9e, 0x55, 0xd4, 0x3f, 0x52, 0xdd,
+			0xde, 0x36, 0x70, 0x96, 0x59, 0x6e, 0x90, 0x78,
+			0x4c, 0x6a, 0x27, 0xde, 0x83, 0x84, 0xc3, 0x35,
+			0x53, 0x76, 0x1d, 0xbf, 0x83, 0x64, 0xcf, 0xf2,
+			0xb0, 0x3e, 0x07, 0x27, 0xe4, 0x25, 0x6c, 0x56,
+		},
+	},
+	{
+		.data_len = 513,
+		.digest = {
+			0x53, 0x50, 0xf7, 0x3b, 0x86, 0x1d, 0x7a, 0xe2,
+			0x5d, 0x9b, 0x71, 0xfa, 0x25, 0x23, 0x5a, 0xfe,
+			0x8c, 0xb9, 0xac, 0x8a, 0x9d, 0x6c, 0x99, 0xbc,
+			0x01, 0x9e, 0xa0, 0xd6, 0x3c, 0x03, 0x46, 0x21,
+			0xb6, 0xd0, 0xb0, 0xb3, 0x23, 0x23, 0x58, 0xf1,
+			0xea, 0x4e, 0xf2, 0x1a, 0x2f, 0x14, 0x2b, 0x5a,
+		},
+	},
+	{
+		.data_len = 1000,
+		.digest = {
+			0x06, 0x03, 0xb3, 0xba, 0x14, 0xe0, 0x28, 0x07,
+			0xd5, 0x15, 0x97, 0x1f, 0x87, 0xef, 0x80, 0xba,
+			0x48, 0x03, 0xb6, 0xc5, 0x47, 0xca, 0x8c, 0x95,
+			0xed, 0x95, 0xfd, 0x27, 0xb6, 0x83, 0xda, 0x6d,
+			0xa7, 0xb2, 0x1a, 0xd2, 0xb5, 0x89, 0xbb, 0xb4,
+			0x00, 0xbc, 0x86, 0x54, 0x7d, 0x5a, 0x91, 0x63,
+		},
+	},
+	{
+		.data_len = 3333,
+		.digest = {
+			0xd3, 0xe0, 0x6e, 0x7d, 0x80, 0x08, 0x53, 0x07,
+			0x8c, 0x0f, 0xc2, 0xce, 0x9f, 0x09, 0x86, 0x31,
+			0x28, 0x24, 0x3c, 0x3e, 0x2d, 0x36, 0xb4, 0x28,
+			0xc7, 0x1b, 0x70, 0xf9, 0x35, 0x9b, 0x10, 0xfa,
+			0xc8, 0x5e, 0x2b, 0x32, 0x7f, 0x65, 0xd2, 0x68,
+			0xb2, 0x84, 0x90, 0xf6, 0xc8, 0x6e, 0xb8, 0xdb,
+		},
+	},
+	{
+		.data_len = 4096,
+		.digest = {
+			0x39, 0xeb, 0xc4, 0xb3, 0x08, 0xe2, 0xdd, 0xf3,
+			0x9f, 0x5e, 0x44, 0x93, 0x63, 0x8b, 0x39, 0x57,
+			0xd7, 0xe8, 0x7e, 0x3d, 0x74, 0xf8, 0xf6, 0xab,
+			0xfe, 0x74, 0x51, 0xe4, 0x1b, 0x4a, 0x23, 0xbc,
+			0x69, 0xfc, 0xbb, 0xa7, 0x71, 0xa7, 0x86, 0x24,
+			0xcc, 0x85, 0x70, 0xf2, 0x31, 0x0d, 0x47, 0xc0,
+		},
+	},
+	{
+		.data_len = 4128,
+		.digest = {
+			0x23, 0xc3, 0x97, 0x06, 0x79, 0xbe, 0x8a, 0xe9,
+			0x1f, 0x1a, 0x43, 0xad, 0xe6, 0x76, 0x23, 0x13,
+			0x64, 0xae, 0xda, 0xe7, 0x8b, 0x88, 0x96, 0xb6,
+			0xa9, 0x1a, 0xb7, 0x80, 0x8e, 0x1c, 0x94, 0x98,
+			0x09, 0x08, 0xdb, 0x8e, 0x4d, 0x0a, 0x09, 0x65,
+			0xe5, 0x21, 0x1c, 0xd9, 0xab, 0x64, 0xbb, 0xea,
+		},
+	},
+	{
+		.data_len = 4160,
+		.digest = {
+			0x4f, 0x4a, 0x88, 0x9f, 0x40, 0x89, 0xfe, 0xb6,
+			0xda, 0x9d, 0xcd, 0xa5, 0x27, 0xd2, 0x29, 0x71,
+			0x58, 0x60, 0xd4, 0x55, 0xfe, 0x92, 0xcd, 0x51,
+			0x8b, 0xec, 0x3b, 0xd3, 0xd1, 0x3e, 0x8d, 0x36,
+			0x7b, 0xb1, 0x41, 0xef, 0xec, 0x9d, 0xdf, 0xcd,
+			0x4e, 0xde, 0x5a, 0xe5, 0xe5, 0x16, 0x14, 0x54,
+		},
+	},
+	{
+		.data_len = 4224,
+		.digest = {
+			0xb5, 0xa5, 0x3e, 0x86, 0x39, 0x20, 0x49, 0x4c,
+			0xcd, 0xb6, 0xdd, 0x03, 0xfe, 0x36, 0x6e, 0xa6,
+			0xfc, 0xff, 0x19, 0x33, 0x0c, 0x52, 0xea, 0x37,
+			0x94, 0xda, 0x5b, 0x27, 0xd1, 0x99, 0x5a, 0x89,
+			0x40, 0x78, 0xfa, 0x96, 0xb9, 0x2f, 0xa0, 0x48,
+			0xc9, 0xf8, 0x5c, 0xf0, 0x95, 0xf4, 0xea, 0x61,
+		},
+	},
+	{
+		.data_len = 16384,
+		.digest = {
+			0x6f, 0x48, 0x6f, 0x21, 0xb9, 0xc1, 0xcc, 0x92,
+			0x4e, 0xed, 0x6b, 0xef, 0x51, 0x88, 0xdf, 0xfd,
+			0xcb, 0x3d, 0x44, 0x9c, 0x37, 0x85, 0xb4, 0xc5,
+			0xeb, 0x60, 0x55, 0x58, 0x01, 0x47, 0xbf, 0x75,
+			0x9b, 0xa8, 0x82, 0x8c, 0xec, 0xe8, 0x0e, 0x58,
+			0xc1, 0x26, 0xa2, 0x45, 0x87, 0x3e, 0xfb, 0x8d,
+		},
+	},
+};
+
+static const u8 hash_testvec_consolidated[SHA384_DIGEST_SIZE] = {
+	0xfc, 0xcb, 0xe6, 0x42, 0xf0, 0x9e, 0x2b, 0x77,
+	0x7b, 0x62, 0xe8, 0x70, 0x86, 0xbf, 0xaf, 0x3c,
+	0xbb, 0x02, 0xd9, 0x86, 0xdc, 0xba, 0xd3, 0xa4,
+	0x0d, 0x8d, 0xb3, 0x2d, 0x0b, 0xa3, 0x84, 0x04,
+	0x7c, 0x16, 0x37, 0xaf, 0xba, 0x1e, 0xd4, 0x2f,
+	0x4c, 0x57, 0x55, 0x86, 0x52, 0x47, 0x9a, 0xec,
+};
+
+static const u8 hmac_testvec_consolidated[SHA384_DIGEST_SIZE] = {
+	0x82, 0xcf, 0x7d, 0x80, 0x71, 0xdb, 0x91, 0x09,
+	0x67, 0xe8, 0x44, 0x4a, 0x0d, 0x03, 0xb1, 0xf9,
+	0x62, 0xde, 0x4e, 0xbb, 0x1f, 0x41, 0xcd, 0x62,
+	0x39, 0x6b, 0x2d, 0x44, 0x0e, 0xde, 0x98, 0x73,
+	0xdd, 0xeb, 0x9d, 0x53, 0xfb, 0xee, 0xd1, 0xc3,
+	0x96, 0xdb, 0xfc, 0x2a, 0x38, 0x90, 0x02, 0x53,
+};