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vmlinux.lds.h: Allow EXCEPTION_TABLE to live in RO_DATA

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Many architectures have an EXCEPTION_TABLE that needs to be only
readable. As such, it should live in RO_DATA. Create a macro to identify
this case for the architectures that can move EXCEPTION_TABLE into
RO_DATA.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Will Deacon <will@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: linux-alpha@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-c6x-dev@linux-c6x.org
Cc: linux-ia64@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-s390@vger.kernel.org
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Rick Edgecombe <rick.p.edgecombe@intel.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: x86-ml <x86@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: https://lkml.kernel.org/r/20191029211351.13243-15-keescook@chromium.org
This commit is contained in:
Kees Cook 2019-10-29 14:13:36 -07:00 committed by Borislav Petkov
parent c9174047b4
commit b8c2f77616
1 changed files with 12 additions and 0 deletions
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12
include/asm-generic/vmlinux.lds.h
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@ -69,6 +69,17 @@
#define NOTES_HEADERS_RESTORE
#endif
/*
* Some architectures have non-executable read-only exception tables.
* They can be added to the RO_DATA segment by specifying their desired
* alignment.
*/
#ifdef RO_EXCEPTION_TABLE_ALIGN
#define RO_EXCEPTION_TABLE EXCEPTION_TABLE(RO_EXCEPTION_TABLE_ALIGN)
#else
#define RO_EXCEPTION_TABLE
#endif
/* Align . to a 8 byte boundary equals to maximum function alignment. */
#define ALIGN_FUNCTION() . = ALIGN(8)
@ -513,6 +524,7 @@
__stop___modver = .; \
} \
\
RO_EXCEPTION_TABLE \
NOTES \
\
. = ALIGN((align)); \