From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christophe Leroy Date: Thu, 14 Oct 2021 05:49:49 +0000 Subject: [PATCH v2 00/13] Fix LKDTM for PPC64/IA64/PARISC Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Andrew Morton , "James E.J. Bottomley" , Helge Deller , Arnd Bergmann , Kees Cook , Greg Kroah-Hartman Cc: Christophe Leroy , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org PPC64/IA64/PARISC have function descriptors. LKDTM doesn't work on those three architectures because LKDTM messes up function descriptors with functions. This series does some cleanup in the three architectures and refactors function descriptors so that it can then easily use it in a generic way in LKDTM. Patch 8 is not absolutely necessary but it is a good trivial cleanup. Changes in v2: - Addressed received comments - Moved dereference_[kernel]_function_descriptor() out of line - Added patches to remove func_descr_t and func_desc_t in powerpc - Using func_desc_t instead of funct_descr_t - Renamed HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR to HAVE_FUNCTION_DESCRIPTORS - Added a new lkdtm test to check protection of function descriptors Christophe Leroy (13): powerpc: Move 'struct ppc64_opd_entry' back into asm/elf.h powerpc: Rename 'funcaddr' to 'addr' in 'struct ppc64_opd_entry' powerpc: Remove func_descr_t powerpc: Prepare func_desc_t for refactorisation ia64: Rename 'ip' to 'addr' in 'struct fdesc' asm-generic: Use HAVE_FUNCTION_DESCRIPTORS to define associated stubs asm-generic: Define 'func_desc_t' to commonly describe function descriptors asm-generic: Refactor dereference_[kernel]_function_descriptor() lkdtm: Force do_nothing() out of line lkdtm: Really write into kernel text in WRITE_KERN lkdtm: Fix lkdtm_EXEC_RODATA() lkdtm: Fix execute_[user]_location() lkdtm: Add a test for function descriptors protection arch/ia64/include/asm/elf.h | 2 +- arch/ia64/include/asm/sections.h | 25 ++------- arch/ia64/kernel/module.c | 6 +-- arch/parisc/include/asm/sections.h | 17 +++--- arch/parisc/kernel/process.c | 21 -------- arch/powerpc/include/asm/code-patching.h | 2 +- arch/powerpc/include/asm/elf.h | 6 +++ arch/powerpc/include/asm/sections.h | 30 ++--------- arch/powerpc/include/asm/types.h | 6 --- arch/powerpc/include/uapi/asm/elf.h | 8 --- arch/powerpc/kernel/module_64.c | 38 +++++-------- arch/powerpc/kernel/signal_64.c | 8 +-- drivers/misc/lkdtm/core.c | 1 + drivers/misc/lkdtm/lkdtm.h | 1 + drivers/misc/lkdtm/perms.c | 68 ++++++++++++++++++++---- include/asm-generic/sections.h | 13 ++++- include/linux/kallsyms.h | 2 +- kernel/extable.c | 23 +++++++- 18 files changed, 138 insertions(+), 139 deletions(-) -- 2.31.1