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| author | Ulises Mendez Martinez <umendez@google.com> | 2026-09-04 15:07:09 +0000 |
|---|---|---|
| committer | Josh Poimboeuf <jpoimboe@kernel.org> | 2026-09-13 18:15:43 -0700 |
| commit | 7e61560628d17ea6b1d8ee370f6d42694cff8758 (patch) | |
| tree | e6080164b2f4c4c419894bdb3ce4d956ca9a98c5 /arch/mips/mm/extable.c | |
| download | linux-stable-7e61560628d17ea6b1d8ee370f6d42694cff8758.tar.gz linux-stable-7e61560628d17ea6b1d8ee370f6d42694cff8758.zip | |
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>
Diffstat (limited to 'arch/mips/mm/extable.c')
| -rw-r--r-- | arch/mips/mm/extable.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/mips/mm/extable.c b/arch/mips/mm/extable.c new file mode 100644 index 000000000..81bc8a34a --- /dev/null +++ b/arch/mips/mm/extable.c @@ -0,0 +1,25 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1997, 99, 2001 - 2004 Ralf Baechle <ralf@linux-mips.org> + */ +#include <linux/extable.h> +#include <linux/spinlock.h> +#include <asm/branch.h> +#include <linux/uaccess.h> + +int fixup_exception(struct pt_regs *regs) +{ + const struct exception_table_entry *fixup; + + fixup = search_exception_tables(exception_epc(regs)); + if (fixup) { + regs->cp0_epc = fixup->nextinsn; + + return 1; + } + + return 0; +} |