From 1705bd6a68171d8b3ba05df9352757ee4e49317b Mon Sep 17 00:00:00 2001 From: Sergey Senozhatsky Date: Fri, 10 Nov 2017 08:48:28 +0900 Subject: parisc64: Add .opd based function descriptor dereference We are moving towards separate kernel and module function descriptor dereference callbacks. This patch enables it for parisc64. 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/20171109234830.5067-5-sergey.senozhatsky@gmail.com To: Tony Luck 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: Helge Deller #parisc64 Signed-off-by: Petr Mladek --- arch/parisc/boot/compressed/vmlinux.lds.S | 2 ++ arch/parisc/include/asm/sections.h | 6 ++++++ arch/parisc/kernel/module.c | 16 ++++++++++++++++ arch/parisc/kernel/process.c | 9 +++++++++ arch/parisc/kernel/vmlinux.lds.S | 2 ++ 5 files changed, 35 insertions(+) (limited to 'arch/parisc') diff --git a/arch/parisc/boot/compressed/vmlinux.lds.S b/arch/parisc/boot/compressed/vmlinux.lds.S index a4ce3314e78e..4ebd4e65524c 100644 --- a/arch/parisc/boot/compressed/vmlinux.lds.S +++ b/arch/parisc/boot/compressed/vmlinux.lds.S @@ -29,7 +29,9 @@ SECTIONS . = ALIGN(16); /* Linkage tables */ .opd : { + __start_opd = .; *(.opd) + __end_opd = .; } PROVIDE (__gp = .); .plt : { *(.plt) diff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h index accdf40aa5b7..5a40b51df80c 100644 --- a/arch/parisc/include/asm/sections.h +++ b/arch/parisc/include/asm/sections.h @@ -6,8 +6,14 @@ #include #ifdef CONFIG_64BIT + +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 + #undef dereference_function_descriptor void *dereference_function_descriptor(void *); + +#undef dereference_kernel_function_descriptor +void *dereference_kernel_function_descriptor(void *); #endif #endif diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c index f1a76935a314..b5b3cb00f1fb 100644 --- a/arch/parisc/kernel/module.c +++ b/arch/parisc/kernel/module.c @@ -66,6 +66,7 @@ #include #include +#include #if 0 #define DEBUGP printk @@ -954,3 +955,18 @@ void module_arch_cleanup(struct module *mod) { deregister_unwind_table(mod); } + +#ifdef CONFIG_64BIT +void *dereference_module_function_descriptor(struct module *mod, void *ptr) +{ + unsigned long start_opd = (Elf64_Addr)mod->core_layout.base + + mod->arch.fdesc_offset; + unsigned long end_opd = start_opd + + mod->arch.fdesc_count * sizeof(Elf64_Fdesc); + + if (ptr < (void *)start_opd || ptr >= (void *)end_opd) + return ptr; + + return dereference_function_descriptor(ptr); +} +#endif diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index 30f92391a93e..6c4585103a91 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -276,6 +276,15 @@ void *dereference_function_descriptor(void *ptr) ptr = p; return ptr; } + +void *dereference_kernel_function_descriptor(void *ptr) +{ + if (ptr < (void *)__start_opd || + ptr >= (void *)__end_opd) + return ptr; + + return dereference_function_descriptor(ptr); +} #endif static inline unsigned long brk_rnd(void) diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S index 159a2ec0b4e0..da2e31190efa 100644 --- a/arch/parisc/kernel/vmlinux.lds.S +++ b/arch/parisc/kernel/vmlinux.lds.S @@ -100,7 +100,9 @@ SECTIONS . = ALIGN(16); /* Linkage tables */ .opd : { + __start_opd = .; *(.opd) + __end_opd = .; } PROVIDE (__gp = .); .plt : { *(.plt) -- cgit v1.2.3