| Message ID | 20171109234830.5067-4-sergey.senozhatsky@gmail.com (mailing list archive) |
|---|---|
| State | Awaiting Upstream, archived |
| Headers | show |
* Sergey Senozhatsky <sergey.senozhatsky@gmail.com> wrote (on 2017-11-10 08:48:27 +0900): > We are moving towards separate kernel and module function descriptor > dereference callbacks. This patch enables it for powerpc64. > > 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). > > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> > --- > arch/powerpc/include/asm/module.h | 3 +++ > arch/powerpc/include/asm/sections.h | 12 ++++++++++++ > arch/powerpc/kernel/module_64.c | 14 ++++++++++++++ > arch/powerpc/kernel/vmlinux.lds.S | 2 ++ > 4 files changed, 31 insertions(+) > Looks good on powerpc. If you wish: Tested-by: Santosh Sivaraj <santosh@fossix.org> # for powerpc Thanks, Santosh > diff --git a/arch/powerpc/include/asm/module.h b/arch/powerpc/include/asm/module.h > index 6c0132c7212f..7e28442827f1 100644 > --- a/arch/powerpc/include/asm/module.h > +++ b/arch/powerpc/include/asm/module.h > @@ -45,6 +45,9 @@ struct mod_arch_specific { > unsigned long tramp; > #endif > > + /* For module function descriptor dereference */ > + unsigned long start_opd; > + unsigned long end_opd; > #else /* powerpc64 */ > /* Indices of PLT sections within module. */ > unsigned int core_plt_section; > diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h > index 82bec63bbd4f..e335a8f846af 100644 > --- a/arch/powerpc/include/asm/sections.h > +++ b/arch/powerpc/include/asm/sections.h > @@ -66,6 +66,9 @@ static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end) > } > > #ifdef PPC64_ELF_ABI_v1 > + > +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 > + > #undef dereference_function_descriptor > static inline void *dereference_function_descriptor(void *ptr) > { > @@ -76,6 +79,15 @@ static inline void *dereference_function_descriptor(void *ptr) > ptr = p; > 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 /* PPC64_ELF_ABI_v1 */ > > #endif > diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c > index 759104b99f9f..218971ac7e04 100644 > --- a/arch/powerpc/kernel/module_64.c > +++ b/arch/powerpc/kernel/module_64.c > @@ -93,6 +93,15 @@ static unsigned int local_entry_offset(const Elf64_Sym *sym) > { > return 0; > } > + > +void *dereference_module_function_descriptor(struct module *mod, void *ptr) > +{ > + if (ptr < (void *)mod->arch.start_opd || > + ptr >= (void *)mod->arch.end_opd) > + return ptr; > + > + return dereference_function_descriptor(ptr); > +} > #endif > > #define STUB_MAGIC 0x73747562 /* stub */ > @@ -344,6 +353,11 @@ int module_frob_arch_sections(Elf64_Ehdr *hdr, > else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0) > dedotify_versions((void *)hdr + sechdrs[i].sh_offset, > sechdrs[i].sh_size); > + else if (!strcmp(secstrings + sechdrs[i].sh_name, ".opd")) { > + me->arch.start_opd = sechdrs[i].sh_addr; > + me->arch.end_opd = sechdrs[i].sh_addr + > + sechdrs[i].sh_size; > + } > > /* We don't handle .init for the moment: rename to _init */ > while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init"))) > diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S > index 0494e1566ee2..5dac5ab22fa2 100644 > --- a/arch/powerpc/kernel/vmlinux.lds.S > +++ b/arch/powerpc/kernel/vmlinux.lds.S > @@ -278,7 +278,9 @@ SECTIONS > } > > .opd : AT(ADDR(.opd) - LOAD_OFFSET) { > + __start_opd = .; > *(.opd) > + __end_opd = .; > } > > . = ALIGN(256);
On (11/13/17 12:41), Santosh Sivaraj wrote: > * Sergey Senozhatsky <sergey.senozhatsky@gmail.com> wrote (on 2017-11-10 08:48:27 +0900): > > > We are moving towards separate kernel and module function descriptor > > dereference callbacks. This patch enables it for powerpc64. > > > > 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). > > > > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> > > --- > > arch/powerpc/include/asm/module.h | 3 +++ > > arch/powerpc/include/asm/sections.h | 12 ++++++++++++ > > arch/powerpc/kernel/module_64.c | 14 ++++++++++++++ > > arch/powerpc/kernel/vmlinux.lds.S | 2 ++ > > 4 files changed, 31 insertions(+) > > > > Looks good on powerpc. If you wish: > > Tested-by: Santosh Sivaraj <santosh@fossix.org> # for powerpc thanks! -ss -- To unsubscribe from this list: send the line "unsubscribe linux-parisc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/powerpc/include/asm/module.h b/arch/powerpc/include/asm/module.h index 6c0132c7212f..7e28442827f1 100644 --- a/arch/powerpc/include/asm/module.h +++ b/arch/powerpc/include/asm/module.h @@ -45,6 +45,9 @@ struct mod_arch_specific { unsigned long tramp; #endif + /* For module function descriptor dereference */ + unsigned long start_opd; + unsigned long end_opd; #else /* powerpc64 */ /* Indices of PLT sections within module. */ unsigned int core_plt_section; diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h index 82bec63bbd4f..e335a8f846af 100644 --- a/arch/powerpc/include/asm/sections.h +++ b/arch/powerpc/include/asm/sections.h @@ -66,6 +66,9 @@ static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end) } #ifdef PPC64_ELF_ABI_v1 + +#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1 + #undef dereference_function_descriptor static inline void *dereference_function_descriptor(void *ptr) { @@ -76,6 +79,15 @@ static inline void *dereference_function_descriptor(void *ptr) ptr = p; 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 /* PPC64_ELF_ABI_v1 */ #endif diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c index 759104b99f9f..218971ac7e04 100644 --- a/arch/powerpc/kernel/module_64.c +++ b/arch/powerpc/kernel/module_64.c @@ -93,6 +93,15 @@ static unsigned int local_entry_offset(const Elf64_Sym *sym) { return 0; } + +void *dereference_module_function_descriptor(struct module *mod, void *ptr) +{ + if (ptr < (void *)mod->arch.start_opd || + ptr >= (void *)mod->arch.end_opd) + return ptr; + + return dereference_function_descriptor(ptr); +} #endif #define STUB_MAGIC 0x73747562 /* stub */ @@ -344,6 +353,11 @@ int module_frob_arch_sections(Elf64_Ehdr *hdr, else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0) dedotify_versions((void *)hdr + sechdrs[i].sh_offset, sechdrs[i].sh_size); + else if (!strcmp(secstrings + sechdrs[i].sh_name, ".opd")) { + me->arch.start_opd = sechdrs[i].sh_addr; + me->arch.end_opd = sechdrs[i].sh_addr + + sechdrs[i].sh_size; + } /* We don't handle .init for the moment: rename to _init */ while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init"))) diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index 0494e1566ee2..5dac5ab22fa2 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -278,7 +278,9 @@ SECTIONS } .opd : AT(ADDR(.opd) - LOAD_OFFSET) { + __start_opd = .; *(.opd) + __end_opd = .; } . = ALIGN(256);
We are moving towards separate kernel and module function descriptor dereference callbacks. This patch enables it for powerpc64. 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). Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> --- arch/powerpc/include/asm/module.h | 3 +++ arch/powerpc/include/asm/sections.h | 12 ++++++++++++ arch/powerpc/kernel/module_64.c | 14 ++++++++++++++ arch/powerpc/kernel/vmlinux.lds.S | 2 ++ 4 files changed, 31 insertions(+)