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author | 2019-11-26 10:42:40 -0800 | |
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committer | 2019-11-26 10:42:40 -0800 | |
commit | 1d87200446f1d10dfe9672ca8edb027a82612f8c (patch) | |
tree | 45cc71ff8e4d1bcde9b07ce8203277f2b8982941 /arch/x86/mm | |
parent | Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/ker... (diff) | |
parent | Merge branch 'x86/build' into x86/asm, to pick up completed topic branch (diff) | |
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Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 asm updates from Ingo Molnar:
"The main changes in this cycle were:
- Cross-arch changes to move the linker sections for NOTES and
EXCEPTION_TABLE into the RO_DATA area, where they belong on most
architectures. (Kees Cook)
- Switch the x86 linker fill byte from x90 (NOP) to 0xcc (INT3), to
trap jumps into the middle of those padding areas instead of
sliding execution. (Kees Cook)
- A thorough cleanup of symbol definitions within x86 assembler code.
The rather randomly named macros got streamlined around a
(hopefully) straightforward naming scheme:
SYM_START(name, linkage, align...)
SYM_END(name, sym_type)
SYM_FUNC_START(name)
SYM_FUNC_END(name)
SYM_CODE_START(name)
SYM_CODE_END(name)
SYM_DATA_START(name)
SYM_DATA_END(name)
etc - with about three times of these basic primitives with some
label, local symbol or attribute variant, expressed via postfixes.
No change in functionality intended. (Jiri Slaby)
- Misc other changes, cleanups and smaller fixes"
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (67 commits)
x86/entry/64: Remove pointless jump in paranoid_exit
x86/entry/32: Remove unused resume_userspace label
x86/build/vdso: Remove meaningless CFLAGS_REMOVE_*.o
m68k: Convert missed RODATA to RO_DATA
x86/vmlinux: Use INT3 instead of NOP for linker fill bytes
x86/mm: Report actual image regions in /proc/iomem
x86/mm: Report which part of kernel image is freed
x86/mm: Remove redundant address-of operators on addresses
xtensa: Move EXCEPTION_TABLE to RO_DATA segment
powerpc: Move EXCEPTION_TABLE to RO_DATA segment
parisc: Move EXCEPTION_TABLE to RO_DATA segment
microblaze: Move EXCEPTION_TABLE to RO_DATA segment
ia64: Move EXCEPTION_TABLE to RO_DATA segment
h8300: Move EXCEPTION_TABLE to RO_DATA segment
c6x: Move EXCEPTION_TABLE to RO_DATA segment
arm64: Move EXCEPTION_TABLE to RO_DATA segment
alpha: Move EXCEPTION_TABLE to RO_DATA segment
x86/vmlinux: Move EXCEPTION_TABLE to RO_DATA segment
x86/vmlinux: Actually use _etext for the end of the text segment
vmlinux.lds.h: Allow EXCEPTION_TABLE to live in RO_DATA
...
Diffstat (limited to 'arch/x86/mm')
-rw-r--r-- | arch/x86/mm/init.c | 8 | ||||
-rw-r--r-- | arch/x86/mm/init_64.c | 16 | ||||
-rw-r--r-- | arch/x86/mm/mem_encrypt_boot.S | 8 | ||||
-rw-r--r-- | arch/x86/mm/pti.c | 2 |
4 files changed, 18 insertions, 16 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index fd10d91a6115..e7bb483557c9 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -829,14 +829,13 @@ void free_init_pages(const char *what, unsigned long begin, unsigned long end) * used for the kernel image only. free_init_pages() will do the * right thing for either kind of address. */ -void free_kernel_image_pages(void *begin, void *end) +void free_kernel_image_pages(const char *what, void *begin, void *end) { unsigned long begin_ul = (unsigned long)begin; unsigned long end_ul = (unsigned long)end; unsigned long len_pages = (end_ul - begin_ul) >> PAGE_SHIFT; - - free_init_pages("unused kernel image", begin_ul, end_ul); + free_init_pages(what, begin_ul, end_ul); /* * PTI maps some of the kernel into userspace. For performance, @@ -865,7 +864,8 @@ void __ref free_initmem(void) mem_encrypt_free_decrypted_mem(); - free_kernel_image_pages(&__init_begin, &__init_end); + free_kernel_image_pages("unused kernel image (initmem)", + &__init_begin, &__init_end); } #ifdef CONFIG_BLK_DEV_INITRD diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index a6b5c653727b..dcb9bc961b39 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1263,7 +1263,7 @@ int kernel_set_to_readonly; void set_kernel_text_rw(void) { unsigned long start = PFN_ALIGN(_text); - unsigned long end = PFN_ALIGN(__stop___ex_table); + unsigned long end = PFN_ALIGN(_etext); if (!kernel_set_to_readonly) return; @@ -1282,7 +1282,7 @@ void set_kernel_text_rw(void) void set_kernel_text_ro(void) { unsigned long start = PFN_ALIGN(_text); - unsigned long end = PFN_ALIGN(__stop___ex_table); + unsigned long end = PFN_ALIGN(_etext); if (!kernel_set_to_readonly) return; @@ -1300,9 +1300,9 @@ void mark_rodata_ro(void) { unsigned long start = PFN_ALIGN(_text); unsigned long rodata_start = PFN_ALIGN(__start_rodata); - unsigned long end = (unsigned long) &__end_rodata_hpage_align; - unsigned long text_end = PFN_ALIGN(&__stop___ex_table); - unsigned long rodata_end = PFN_ALIGN(&__end_rodata); + unsigned long end = (unsigned long)__end_rodata_hpage_align; + unsigned long text_end = PFN_ALIGN(_etext); + unsigned long rodata_end = PFN_ALIGN(__end_rodata); unsigned long all_end; printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n", @@ -1334,8 +1334,10 @@ void mark_rodata_ro(void) set_memory_ro(start, (end-start) >> PAGE_SHIFT); #endif - free_kernel_image_pages((void *)text_end, (void *)rodata_start); - free_kernel_image_pages((void *)rodata_end, (void *)_sdata); + free_kernel_image_pages("unused kernel image (text/rodata gap)", + (void *)text_end, (void *)rodata_start); + free_kernel_image_pages("unused kernel image (rodata/data gap)", + (void *)rodata_end, (void *)_sdata); debug_checkwx(); } diff --git a/arch/x86/mm/mem_encrypt_boot.S b/arch/x86/mm/mem_encrypt_boot.S index 6d71481a1e70..106ead05bbe3 100644 --- a/arch/x86/mm/mem_encrypt_boot.S +++ b/arch/x86/mm/mem_encrypt_boot.S @@ -16,7 +16,7 @@ .text .code64 -ENTRY(sme_encrypt_execute) +SYM_FUNC_START(sme_encrypt_execute) /* * Entry parameters: @@ -66,9 +66,9 @@ ENTRY(sme_encrypt_execute) pop %rbp ret -ENDPROC(sme_encrypt_execute) +SYM_FUNC_END(sme_encrypt_execute) -ENTRY(__enc_copy) +SYM_FUNC_START(__enc_copy) /* * Routine used to encrypt memory in place. * This routine must be run outside of the kernel proper since @@ -153,4 +153,4 @@ ENTRY(__enc_copy) ret .L__enc_copy_end: -ENDPROC(__enc_copy) +SYM_FUNC_END(__enc_copy) diff --git a/arch/x86/mm/pti.c b/arch/x86/mm/pti.c index 7f2140414440..44a9f068eee0 100644 --- a/arch/x86/mm/pti.c +++ b/arch/x86/mm/pti.c @@ -574,7 +574,7 @@ static void pti_clone_kernel_text(void) */ unsigned long start = PFN_ALIGN(_text); unsigned long end_clone = (unsigned long)__end_rodata_aligned; - unsigned long end_global = PFN_ALIGN((unsigned long)__stop___ex_table); + unsigned long end_global = PFN_ALIGN((unsigned long)_etext); if (!pti_kernel_image_global_ok()) return; |