From 8e30788816d4d4a991136cfe9ba8715d62f31d80 Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky Date: Fri, 10 Nov 2017 08:48:26 +0900 Subject: ia64: Add .opd based function descriptor dereference We are moving towards separate kernel and module function descriptor dereference callbacks. This patch enables it for IA64. For pointers that belong to the kernel - Added __start_opd and __end_opd pointers, to track the kernel .opd section address range; - Added dereference_kernel_function_descriptor(). Now we will dereference only function pointers that are within [__start_opd, __end_opd); For pointers that belong to a module - Added dereference_module_function_descriptor() to handle module function descriptor dereference. Now we will dereference only pointers that are within [module->opd.start, module->opd.end). Link: http://lkml.kernel.org/r/20171109234830.5067-3-sergey.senozhatsky@gmail.com To: Fenghua Yu To: Helge Deller To: Benjamin Herrenschmidt To: Paul Mackerras To: Michael Ellerman To: James Bottomley Cc: Andrew Morton Cc: Jessica Yu Cc: Steven Rostedt Cc: linux-ia64@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Sergey Senozhatsky Tested-by: Tony Luck #ia64 Signed-off-by: Petr Mladek --- arch/ia64/include/asm/sections.h | 10 +++++++++- arch/ia64/kernel/module.c | 12 ++++++++++++ arch/ia64/kernel/vmlinux.lds.S | 2 ++ 3 files changed, 23 insertions(+), 1 deletion(-) (limited to 'arch/ia64') diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h index f3481408594e..cea15f2dd38d 100644 --- a/arch/ia64/include/asm/sections.h +++ b/arch/ia64/include/asm/sections.h @@ -27,6 +27,8 @@ extern char __start_gate_brl_fsys_bubble_down_patchlist[], __end_gate_brl_fsys_b extern char __start_unwind[], __end_unwind[]; extern char __start_ivt_text[], __end_ivt_text[]; +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 + #undef dereference_function_descriptor static inline void *dereference_function_descriptor(void *ptr) { @@ -38,6 +40,12 @@ static inline void *dereference_function_descriptor(void *ptr) return ptr; } +#undef dereference_kernel_function_descriptor +static inline void *dereference_kernel_function_descriptor(void *ptr) +{ + if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd) + return ptr; + return dereference_function_descriptor(ptr); +} #endif /* _ASM_IA64_SECTIONS_H */ - diff --git a/arch/ia64/kernel/module.c b/arch/ia64/kernel/module.c index 853b5611a894..326448f9df16 100644 --- a/arch/ia64/kernel/module.c +++ b/arch/ia64/kernel/module.c @@ -36,6 +36,7 @@ #include #include +#include #define ARCH_MODULE_DEBUG 0 @@ -918,3 +919,14 @@ module_arch_cleanup (struct module *mod) if (mod->arch.core_unw_table) unw_remove_unwind_table(mod->arch.core_unw_table); } + +void *dereference_module_function_descriptor(struct module *mod, void *ptr) +{ + Elf64_Shdr *opd = mod->arch.opd; + + if (ptr < (void *)opd->sh_addr || + ptr >= (void *)(opd->sh_addr + opd->sh_size)) + return ptr; + + return dereference_function_descriptor(ptr); +} diff --git a/arch/ia64/kernel/vmlinux.lds.S b/arch/ia64/kernel/vmlinux.lds.S index 58db59da0bd8..31e688981b4b 100644 --- a/arch/ia64/kernel/vmlinux.lds.S +++ b/arch/ia64/kernel/vmlinux.lds.S @@ -108,7 +108,9 @@ SECTIONS { RODATA .opd : AT(ADDR(.opd) - LOAD_OFFSET) { + __start_opd = .; *(.opd) + __end_opd = .; } /* -- cgit