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dc4197236c
linux/tools/objtool
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Josh Poimboeuf dc4197236c objtool: Add relocation check for alternative sections 
Relocations in alternative code can be dangerous, because the code is
copy/pasted to the text section after relocations have been resolved,
which can corrupt PC-relative addresses.

However, relocations might be acceptable in some cases, depending on the
architecture.  For example, the x86 alternatives code manually fixes up
the target addresses for PC-relative jumps and calls.

So disallow relocations in alternative code, except where the x86 arch
code allows it.

This code may need to be tweaked for other arches when objtool gets
support for them.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Julien Thierry <jthierry@redhat.com>
Link: https://lkml.kernel.org/r/7b90b68d093311e4e8f6b504a9e1c758fd7e0002.1581359535.git.jpoimboe@redhat.com
2020-02-11 13:39:52 +01:00
..
arch/x86 objtool: Move x86 insn decoder to a common location 2019-08-31 22:27:52 -03:00
Documentation docs: fix broken documentation links 2019-06-08 13:42:13 -06:00
.gitignore
arch.h objtool: Support conditional retpolines 2019-07-18 21:01:10 +02:00
Build objtool: Fix build by linking against tools/lib/ctype.o sources 2019-07-02 10:49:31 -03:00
builtin-check.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
builtin-orc.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
builtin.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
cfi.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
check.c objtool: Add relocation check for alternative sections 2020-02-11 13:39:52 +01:00
check.h objtool: Improve UACCESS coverage 2019-07-25 08:36:39 +02:00
elf.c objtool: Refactor jump table code 2019-07-18 21:01:09 +02:00
elf.h objtool: Support repeated uses of the same C jump table 2019-07-18 21:01:09 +02:00
Makefile objtool: Fix ARCH=x86_64 build error 2020-01-22 07:54:57 +01:00
objtool.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
orc_dump.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
orc_gen.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
orc.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
special.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
special.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00
sync-check.sh objtool: Silence build output 2020-01-22 07:54:34 +01:00
warn.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 13 2019-05-21 11:28:45 +02:00