objtool: Validate disassembler headers in libopcodes probegrafted

commit 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
tested for libopcodes availability by linking a test snippet with a forward
declaration of disassemble_init_for_target().

However, testing symbol linkage with an extern declaration only verifies
the presence of the library (.so/.a) and bypasses checking for development
headers (binutils-dev). On systems where libopcodes is present without
development headers installed, the probe succeeds, enabling BUILD_DISAS.
Subsequent compilation of objtool then fails:

  fatal error: 'bfd.h' file not found
    113 | #include <bfd.h>

Additionally, the probe invokes $(HOSTCC) without $(HOSTCFLAGS), ignoring
any sysroot or include flags specified for the host compiler.

Fix this by including <bfd.h> and <dis-asm.h> directly in the test snippet,
passing $(HOSTCFLAGS) so host compiler options are respected, and defining
PACKAGE="objtool" to satisfy the configuration check in <bfd.h>.

Fixes: 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
Fixes: 436326bc525d ("objtool: fix build failure due to missing libopcodes check")
Reported-by: Alice Ryhl <aliceryhl@google.com>
Assisted-by: Antigravity:Gemini-Next
Signed-off-by: Ulises Mendez Martinez <umendez@google.com>
Link: https://patch.msgid.link/20260904150710.2997558-1-umendez@google.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/net/wireless/michael-mic.c b/net/wireless/michael-mic.c
new file mode 100644
index 000000000..ec5164756
--- /dev/null
+++ b/net/wireless/michael-mic.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Michael MIC implementation - optimized for TKIP MIC operations
+ * Copyright 2002-2003, Instant802 Networks, Inc.
+ */
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/export.h>
+#include <linux/ieee80211.h>
+#include <linux/unaligned.h>
+
+struct michael_mic_ctx {
+	u32 l, r;
+};
+
+static void michael_block(struct michael_mic_ctx *mctx, u32 val)
+{
+	mctx->l ^= val;
+	mctx->r ^= rol32(mctx->l, 17);
+	mctx->l += mctx->r;
+	mctx->r ^= ((mctx->l & 0xff00ff00) >> 8) |
+		   ((mctx->l & 0x00ff00ff) << 8);
+	mctx->l += mctx->r;
+	mctx->r ^= rol32(mctx->l, 3);
+	mctx->l += mctx->r;
+	mctx->r ^= ror32(mctx->l, 2);
+	mctx->l += mctx->r;
+}
+
+static void michael_mic_hdr(struct michael_mic_ctx *mctx, const u8 *key,
+			    struct ieee80211_hdr *hdr)
+{
+	u8 *da, *sa, tid;
+
+	da = ieee80211_get_DA(hdr);
+	sa = ieee80211_get_SA(hdr);
+	if (ieee80211_is_data_qos(hdr->frame_control))
+		tid = ieee80211_get_tid(hdr);
+	else
+		tid = 0;
+
+	mctx->l = get_unaligned_le32(key);
+	mctx->r = get_unaligned_le32(key + 4);
+
+	/*
+	 * A pseudo header (DA, SA, Priority, 0, 0, 0) is used in Michael MIC
+	 * calculation, but it is _not_ transmitted
+	 */
+	michael_block(mctx, get_unaligned_le32(da));
+	michael_block(mctx, get_unaligned_le16(&da[4]) |
+			    (get_unaligned_le16(sa) << 16));
+	michael_block(mctx, get_unaligned_le32(&sa[2]));
+	michael_block(mctx, tid);
+}
+
+void michael_mic(const u8 *key, struct ieee80211_hdr *hdr,
+		 const u8 *data, size_t data_len, u8 *mic)
+{
+	u32 val;
+	size_t block, blocks, left;
+	struct michael_mic_ctx mctx;
+
+	michael_mic_hdr(&mctx, key, hdr);
+
+	/* Real data */
+	blocks = data_len / 4;
+	left = data_len % 4;
+
+	for (block = 0; block < blocks; block++)
+		michael_block(&mctx, get_unaligned_le32(&data[block * 4]));
+
+	/* Partial block of 0..3 bytes and padding: 0x5a + 4..7 zeros to make
+	 * total length a multiple of 4. */
+	val = 0x5a;
+	while (left > 0) {
+		val <<= 8;
+		left--;
+		val |= data[blocks * 4 + left];
+	}
+
+	michael_block(&mctx, val);
+	michael_block(&mctx, 0);
+
+	put_unaligned_le32(mctx.l, mic);
+	put_unaligned_le32(mctx.r, mic + 4);
+}
+EXPORT_SYMBOL_GPL(michael_mic);