| Message ID | c215b244a19a07327ec81bf99f3c5f89c68af7b4.1633964380.git.christophe.leroy@csgroup.eu (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Fix LKDTM for PPC64/IA64/PARISC | expand |
On Mon, Oct 11, 2021 at 05:25:33PM +0200, Christophe Leroy wrote: > dereference_function_descriptor() and > dereference_kernel_function_descriptor() are identical on the > three architectures implementing them. > > Make it common. > > Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> > --- > arch/ia64/include/asm/sections.h | 19 ------------------- > arch/parisc/include/asm/sections.h | 9 --------- > arch/parisc/kernel/process.c | 21 --------------------- > arch/powerpc/include/asm/sections.h | 23 ----------------------- > include/asm-generic/sections.h | 18 ++++++++++++++++++ > 5 files changed, 18 insertions(+), 72 deletions(-) A diffstat to love. :) Reviewed-by: Kees Cook <keescook@chromium.org> > > diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h > index 929b5c535620..d9addaea8339 100644 > --- a/arch/ia64/include/asm/sections.h > +++ b/arch/ia64/include/asm/sections.h > @@ -30,23 +30,4 @@ 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[]; > > -#undef dereference_function_descriptor > -static inline void *dereference_function_descriptor(void *ptr) > -{ > - struct fdesc *desc = ptr; > - void *p; > - > - if (!get_kernel_nofault(p, (void *)&desc->addr)) > - 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 /* _ASM_IA64_SECTIONS_H */ > diff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h > index 329e80f7af0a..b041fb32a300 100644 > --- a/arch/parisc/include/asm/sections.h > +++ b/arch/parisc/include/asm/sections.h > @@ -12,13 +12,4 @@ typedef Elf64_Fdesc funct_descr_t; > > extern char __alt_instructions[], __alt_instructions_end[]; > > -#ifdef CONFIG_64BIT > - > -#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/process.c b/arch/parisc/kernel/process.c > index 38ec4ae81239..7382576b52a8 100644 > --- a/arch/parisc/kernel/process.c > +++ b/arch/parisc/kernel/process.c > @@ -266,27 +266,6 @@ get_wchan(struct task_struct *p) > return 0; > } > > -#ifdef CONFIG_64BIT > -void *dereference_function_descriptor(void *ptr) > -{ > - Elf64_Fdesc *desc = ptr; > - void *p; > - > - if (!get_kernel_nofault(p, (void *)&desc->addr)) > - 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) > { > return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; > diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h > index d0d5287fa568..8f8e95f234e2 100644 > --- a/arch/powerpc/include/asm/sections.h > +++ b/arch/powerpc/include/asm/sections.h > @@ -72,29 +72,6 @@ static inline int overlaps_kernel_text(unsigned long start, unsigned long end) > (unsigned long)_stext < end; > } > > -#ifdef PPC64_ELF_ABI_v1 > - > -#undef dereference_function_descriptor > -static inline void *dereference_function_descriptor(void *ptr) > -{ > - struct ppc64_opd_entry *desc = ptr; > - void *p; > - > - if (!get_kernel_nofault(p, (void *)&desc->addr)) > - 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 > > #endif /* __KERNEL__ */ > diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h > index 436412d94054..5baaf9d7c671 100644 > --- a/include/asm-generic/sections.h > +++ b/include/asm-generic/sections.h > @@ -60,6 +60,24 @@ extern __visible const void __nosave_begin, __nosave_end; > > /* Function descriptor handling (if any). Override in asm/sections.h */ > #ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR > +static inline void *dereference_function_descriptor(void *ptr) > +{ > + funct_descr_t *desc = ptr; > + void *p; > + > + if (!get_kernel_nofault(p, (void *)&desc->addr)) > + ptr = p; > + return ptr; > +} > + > +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); > +} > + > #else > #define dereference_function_descriptor(p) ((void *)(p)) > #define dereference_kernel_function_descriptor(p) ((void *)(p)) > -- > 2.31.1 >
Le 13/10/2021 à 09:02, Kees Cook a écrit : > On Mon, Oct 11, 2021 at 05:25:33PM +0200, Christophe Leroy wrote: >> dereference_function_descriptor() and >> dereference_kernel_function_descriptor() are identical on the >> three architectures implementing them. >> >> Make it common. >> >> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> >> --- >> arch/ia64/include/asm/sections.h | 19 ------------------- >> arch/parisc/include/asm/sections.h | 9 --------- >> arch/parisc/kernel/process.c | 21 --------------------- >> arch/powerpc/include/asm/sections.h | 23 ----------------------- >> include/asm-generic/sections.h | 18 ++++++++++++++++++ >> 5 files changed, 18 insertions(+), 72 deletions(-) > > A diffstat to love. :) > > Reviewed-by: Kees Cook <keescook@chromium.org> Unless somebody minds, I will make them out of line as suggested by Helge in he's comment to patch 4. Allthough there is no spectacular size reduction, the functions are not worth being inlined as they are not used in critical pathes.
On Wed, Oct 13, 2021 at 1:20 PM Christophe Leroy <christophe.leroy@csgroup.eu> wrote: > Le 13/10/2021 à 09:02, Kees Cook a écrit : > > On Mon, Oct 11, 2021 at 05:25:33PM +0200, Christophe Leroy wrote: > >> dereference_function_descriptor() and > >> dereference_kernel_function_descriptor() are identical on the > >> three architectures implementing them. > >> > >> Make it common. > >> > >> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> > >> --- > >> arch/ia64/include/asm/sections.h | 19 ------------------- > >> arch/parisc/include/asm/sections.h | 9 --------- > >> arch/parisc/kernel/process.c | 21 --------------------- > >> arch/powerpc/include/asm/sections.h | 23 ----------------------- > >> include/asm-generic/sections.h | 18 ++++++++++++++++++ > >> 5 files changed, 18 insertions(+), 72 deletions(-) > > > > A diffstat to love. :) > > > > Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Arnd Bergmann <arnd@arndb.de> > Unless somebody minds, I will make them out of line as > suggested by Helge in he's comment to patch 4. > > Allthough there is no spectacular size reduction, the functions > are not worth being inlined as they are not used in critical pathes. Sounds good to me. Arnd
diff --git a/arch/ia64/include/asm/sections.h b/arch/ia64/include/asm/sections.h index 929b5c535620..d9addaea8339 100644 --- a/arch/ia64/include/asm/sections.h +++ b/arch/ia64/include/asm/sections.h @@ -30,23 +30,4 @@ 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[]; -#undef dereference_function_descriptor -static inline void *dereference_function_descriptor(void *ptr) -{ - struct fdesc *desc = ptr; - void *p; - - if (!get_kernel_nofault(p, (void *)&desc->addr)) - 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 /* _ASM_IA64_SECTIONS_H */ diff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h index 329e80f7af0a..b041fb32a300 100644 --- a/arch/parisc/include/asm/sections.h +++ b/arch/parisc/include/asm/sections.h @@ -12,13 +12,4 @@ typedef Elf64_Fdesc funct_descr_t; extern char __alt_instructions[], __alt_instructions_end[]; -#ifdef CONFIG_64BIT - -#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/process.c b/arch/parisc/kernel/process.c index 38ec4ae81239..7382576b52a8 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -266,27 +266,6 @@ get_wchan(struct task_struct *p) return 0; } -#ifdef CONFIG_64BIT -void *dereference_function_descriptor(void *ptr) -{ - Elf64_Fdesc *desc = ptr; - void *p; - - if (!get_kernel_nofault(p, (void *)&desc->addr)) - 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) { return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT; diff --git a/arch/powerpc/include/asm/sections.h b/arch/powerpc/include/asm/sections.h index d0d5287fa568..8f8e95f234e2 100644 --- a/arch/powerpc/include/asm/sections.h +++ b/arch/powerpc/include/asm/sections.h @@ -72,29 +72,6 @@ static inline int overlaps_kernel_text(unsigned long start, unsigned long end) (unsigned long)_stext < end; } -#ifdef PPC64_ELF_ABI_v1 - -#undef dereference_function_descriptor -static inline void *dereference_function_descriptor(void *ptr) -{ - struct ppc64_opd_entry *desc = ptr; - void *p; - - if (!get_kernel_nofault(p, (void *)&desc->addr)) - 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 #endif /* __KERNEL__ */ diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h index 436412d94054..5baaf9d7c671 100644 --- a/include/asm-generic/sections.h +++ b/include/asm-generic/sections.h @@ -60,6 +60,24 @@ extern __visible const void __nosave_begin, __nosave_end; /* Function descriptor handling (if any). Override in asm/sections.h */ #ifdef HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR +static inline void *dereference_function_descriptor(void *ptr) +{ + funct_descr_t *desc = ptr; + void *p; + + if (!get_kernel_nofault(p, (void *)&desc->addr)) + ptr = p; + return ptr; +} + +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); +} + #else #define dereference_function_descriptor(p) ((void *)(p)) #define dereference_kernel_function_descriptor(p) ((void *)(p))
dereference_function_descriptor() and dereference_kernel_function_descriptor() are identical on the three architectures implementing them. Make it common. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> --- arch/ia64/include/asm/sections.h | 19 ------------------- arch/parisc/include/asm/sections.h | 9 --------- arch/parisc/kernel/process.c | 21 --------------------- arch/powerpc/include/asm/sections.h | 23 ----------------------- include/asm-generic/sections.h | 18 ++++++++++++++++++ 5 files changed, 18 insertions(+), 72 deletions(-)