diff options
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/compat_signal.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/entry.S | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/signal.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso.c | 26 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/Makefile | 9 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/vdso.h | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/vdso64.lds.S | 7 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/vgetrandom-chacha.S | 185 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso64/vgetrandom.c | 14 |
9 files changed, 237 insertions, 11 deletions
diff --git a/arch/s390/kernel/compat_signal.c b/arch/s390/kernel/compat_signal.c index 1942e2a9f8db..5a86b9d1da71 100644 --- a/arch/s390/kernel/compat_signal.c +++ b/arch/s390/kernel/compat_signal.c @@ -24,11 +24,11 @@ #include <linux/tty.h> #include <linux/personality.h> #include <linux/binfmts.h> +#include <asm/vdso-symbols.h> #include <asm/access-regs.h> #include <asm/ucontext.h> #include <linux/uaccess.h> #include <asm/lowcore.h> -#include <asm/vdso.h> #include <asm/fpu.h> #include "compat_linux.h" #include "compat_ptrace.h" diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 749410cfdbc0..269436665d02 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -42,7 +42,7 @@ _LPP_OFFSET = __LC_LPP .macro LPSWEY address, lpswe ALTERNATIVE_2 "b \lpswe;nopr", \ - ".insn siy,0xeb0000000071,\address,0", ALT_FACILITY_EARLY(193), \ + ".insn siy,0xeb0000000071,\address,0", ALT_FACILITY(193), \ __stringify(.insn siy,0xeb0000000071,LOWCORE_ALT_ADDRESS+\address,0), \ ALT_LOWCORE .endm diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c index 6c2cb345402f..e48013cd832c 100644 --- a/arch/s390/kernel/signal.c +++ b/arch/s390/kernel/signal.c @@ -30,9 +30,9 @@ #include <linux/compat.h> #include <asm/ucontext.h> #include <linux/uaccess.h> +#include <asm/vdso-symbols.h> #include <asm/access-regs.h> #include <asm/lowcore.h> -#include <asm/vdso.h> #include "entry.h" /* diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index 2f967ac2b8e3..598b512cde01 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -12,12 +12,15 @@ #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/module.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/smp.h> #include <linux/time_namespace.h> #include <linux/random.h> #include <vdso/datapage.h> +#include <asm/vdso/vsyscall.h> +#include <asm/alternative.h> #include <asm/vdso.h> extern char vdso64_start[], vdso64_end[]; @@ -29,12 +32,6 @@ static union vdso_data_store vdso_data_store __page_aligned_data; struct vdso_data *vdso_data = vdso_data_store.data; -enum vvar_pages { - VVAR_DATA_PAGE_OFFSET, - VVAR_TIMENS_PAGE_OFFSET, - VVAR_NR_PAGES, -}; - #ifdef CONFIG_TIME_NS struct vdso_data *arch_get_vdso_data(void *vvar_page) { @@ -250,8 +247,25 @@ static struct page ** __init vdso_setup_pages(void *start, void *end) return pagelist; } +static void vdso_apply_alternatives(void) +{ + const struct elf64_shdr *alt, *shdr; + struct alt_instr *start, *end; + const struct elf64_hdr *hdr; + + hdr = (struct elf64_hdr *)vdso64_start; + shdr = (void *)hdr + hdr->e_shoff; + alt = find_section(hdr, shdr, ".altinstructions"); + if (!alt) + return; + start = (void *)hdr + alt->sh_offset; + end = (void *)hdr + alt->sh_offset + alt->sh_size; + apply_alternatives(start, end); +} + static int __init vdso_init(void) { + vdso_apply_alternatives(); vdso64_mapping.pages = vdso_setup_pages(vdso64_start, vdso64_end); if (IS_ENABLED(CONFIG_COMPAT)) vdso32_mapping.pages = vdso_setup_pages(vdso32_start, vdso32_end); diff --git a/arch/s390/kernel/vdso64/Makefile b/arch/s390/kernel/vdso64/Makefile index ba19c0ca7c87..37bb4b761229 100644 --- a/arch/s390/kernel/vdso64/Makefile +++ b/arch/s390/kernel/vdso64/Makefile @@ -3,12 +3,17 @@ # Include the generic Makefile to check the built vdso. include $(srctree)/lib/vdso/Makefile -obj-vdso64 = vdso_user_wrapper.o note.o -obj-cvdso64 = vdso64_generic.o getcpu.o +obj-vdso64 = vdso_user_wrapper.o note.o vgetrandom-chacha.o +obj-cvdso64 = vdso64_generic.o getcpu.o vgetrandom.o VDSO_CFLAGS_REMOVE := -pg $(CC_FLAGS_FTRACE) $(CC_FLAGS_EXPOLINE) $(CC_FLAGS_CHECK_STACK) CFLAGS_REMOVE_getcpu.o = $(VDSO_CFLAGS_REMOVE) +CFLAGS_REMOVE_vgetrandom.o = $(VDSO_CFLAGS_REMOVE) CFLAGS_REMOVE_vdso64_generic.o = $(VDSO_CFLAGS_REMOVE) +ifneq ($(c-getrandom-y),) + CFLAGS_vgetrandom.o += -include $(c-getrandom-y) +endif + # Build rules targets := $(obj-vdso64) $(obj-cvdso64) vdso64.so vdso64.so.dbg diff --git a/arch/s390/kernel/vdso64/vdso.h b/arch/s390/kernel/vdso64/vdso.h index 34c7a2312f9d..9e5397e7b590 100644 --- a/arch/s390/kernel/vdso64/vdso.h +++ b/arch/s390/kernel/vdso64/vdso.h @@ -10,5 +10,6 @@ int __s390_vdso_getcpu(unsigned *cpu, unsigned *node, struct getcpu_cache *unuse int __s390_vdso_gettimeofday(struct __kernel_old_timeval *tv, struct timezone *tz); int __s390_vdso_clock_gettime(clockid_t clock, struct __kernel_timespec *ts); int __s390_vdso_clock_getres(clockid_t clock, struct __kernel_timespec *ts); +ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len); #endif /* __ARCH_S390_KERNEL_VDSO64_VDSO_H */ diff --git a/arch/s390/kernel/vdso64/vdso64.lds.S b/arch/s390/kernel/vdso64/vdso64.lds.S index 37e2a505e81d..753040a4b5ab 100644 --- a/arch/s390/kernel/vdso64/vdso64.lds.S +++ b/arch/s390/kernel/vdso64/vdso64.lds.S @@ -4,6 +4,7 @@ * library */ +#include <asm/vdso/vsyscall.h> #include <asm/page.h> #include <asm/vdso.h> @@ -13,6 +14,7 @@ OUTPUT_ARCH(s390:64-bit) SECTIONS { PROVIDE(_vdso_data = . - __VVAR_PAGES * PAGE_SIZE); + PROVIDE(_vdso_rng_data = _vdso_data + __VDSO_RND_DATA_OFFSET); #ifdef CONFIG_TIME_NS PROVIDE(_timens_data = _vdso_data + PAGE_SIZE); #endif @@ -42,6 +44,10 @@ SECTIONS .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } .rodata1 : { *(.rodata1) } + . = ALIGN(8); + .altinstructions : { *(.altinstructions) } + .altinstr_replacement : { *(.altinstr_replacement) } + .dynamic : { *(.dynamic) } :text :dynamic .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr @@ -140,6 +146,7 @@ VERSION __kernel_restart_syscall; __kernel_rt_sigreturn; __kernel_sigreturn; + __kernel_getrandom; local: *; }; } diff --git a/arch/s390/kernel/vdso64/vgetrandom-chacha.S b/arch/s390/kernel/vdso64/vgetrandom-chacha.S new file mode 100644 index 000000000000..d802b0a96f41 --- /dev/null +++ b/arch/s390/kernel/vdso64/vgetrandom-chacha.S @@ -0,0 +1,185 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <linux/linkage.h> +#include <asm/alternative.h> +#include <asm/fpu-insn.h> + +#define STATE0 %v0 +#define STATE1 %v1 +#define STATE2 %v2 +#define STATE3 %v3 +#define COPY0 %v4 +#define COPY1 %v5 +#define COPY2 %v6 +#define COPY3 %v7 +#define PERM4 %v16 +#define PERM8 %v17 +#define PERM12 %v18 +#define BEPERM %v19 +#define TMP0 %v20 +#define TMP1 %v21 +#define TMP2 %v22 +#define TMP3 %v23 + + .section .rodata + + .balign 128 +.Lconstants: + .long 0x61707865,0x3320646e,0x79622d32,0x6b206574 # endian-neutral + .long 0x04050607,0x08090a0b,0x0c0d0e0f,0x00010203 # rotl 4 bytes + .long 0x08090a0b,0x0c0d0e0f,0x00010203,0x04050607 # rotl 8 bytes + .long 0x0c0d0e0f,0x00010203,0x04050607,0x08090a0b # rotl 12 bytes + .long 0x03020100,0x07060504,0x0b0a0908,0x0f0e0d0c # byte swap + + .text +/* + * s390 ChaCha20 implementation meant for vDSO. Produces a given positive + * number of blocks of output with nonce 0, taking an input key and 8-bytes + * counter. Does not spill to the stack. + * + * void __arch_chacha20_blocks_nostack(uint8_t *dst_bytes, + * const uint8_t *key, + * uint32_t *counter, + * size_t nblocks) + */ +SYM_FUNC_START(__arch_chacha20_blocks_nostack) + larl %r1,.Lconstants + + /* COPY0 = "expand 32-byte k" */ + VL COPY0,0,,%r1 + + /* PERM4-PERM12,BEPERM = byte selectors for VPERM */ + VLM PERM4,BEPERM,16,%r1 + + /* COPY1,COPY2 = key */ + VLM COPY1,COPY2,0,%r3 + + /* COPY3 = counter || zero nonce */ + lg %r3,0(%r4) + VZERO COPY3 + VLVGG COPY3,%r3,0 + + lghi %r1,0 +.Lblock: + VLR STATE0,COPY0 + VLR STATE1,COPY1 + VLR STATE2,COPY2 + VLR STATE3,COPY3 + + lghi %r0,10 +.Ldoubleround: + /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 16) */ + VAF STATE0,STATE0,STATE1 + VX STATE3,STATE3,STATE0 + VERLLF STATE3,STATE3,16 + + /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 12) */ + VAF STATE2,STATE2,STATE3 + VX STATE1,STATE1,STATE2 + VERLLF STATE1,STATE1,12 + + /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 8) */ + VAF STATE0,STATE0,STATE1 + VX STATE3,STATE3,STATE0 + VERLLF STATE3,STATE3,8 + + /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 7) */ + VAF STATE2,STATE2,STATE3 + VX STATE1,STATE1,STATE2 + VERLLF STATE1,STATE1,7 + + /* STATE1[0,1,2,3] = STATE1[1,2,3,0] */ + VPERM STATE1,STATE1,STATE1,PERM4 + /* STATE2[0,1,2,3] = STATE2[2,3,0,1] */ + VPERM STATE2,STATE2,STATE2,PERM8 + /* STATE3[0,1,2,3] = STATE3[3,0,1,2] */ + VPERM STATE3,STATE3,STATE3,PERM12 + + /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 16) */ + VAF STATE0,STATE0,STATE1 + VX STATE3,STATE3,STATE0 + VERLLF STATE3,STATE3,16 + + /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 12) */ + VAF STATE2,STATE2,STATE3 + VX STATE1,STATE1,STATE2 + VERLLF STATE1,STATE1,12 + + /* STATE0 += STATE1, STATE3 = rotl32(STATE3 ^ STATE0, 8) */ + VAF STATE0,STATE0,STATE1 + VX STATE3,STATE3,STATE0 + VERLLF STATE3,STATE3,8 + + /* STATE2 += STATE3, STATE1 = rotl32(STATE1 ^ STATE2, 7) */ + VAF STATE2,STATE2,STATE3 + VX STATE1,STATE1,STATE2 + VERLLF STATE1,STATE1,7 + + /* STATE1[0,1,2,3] = STATE1[3,0,1,2] */ + VPERM STATE1,STATE1,STATE1,PERM12 + /* STATE2[0,1,2,3] = STATE2[2,3,0,1] */ + VPERM STATE2,STATE2,STATE2,PERM8 + /* STATE3[0,1,2,3] = STATE3[1,2,3,0] */ + VPERM STATE3,STATE3,STATE3,PERM4 + brctg %r0,.Ldoubleround + + /* OUTPUT0 = STATE0 + STATE0 */ + VAF STATE0,STATE0,COPY0 + /* OUTPUT1 = STATE1 + STATE1 */ + VAF STATE1,STATE1,COPY1 + /* OUTPUT2 = STATE2 + STATE2 */ + VAF STATE2,STATE2,COPY2 + /* OUTPUT2 = STATE3 + STATE3 */ + VAF STATE3,STATE3,COPY3 + + /* + * 32 bit wise little endian store to OUTPUT. If the vector + * enhancement facility 2 is not installed use the slow path. + */ + ALTERNATIVE "brc 0xf,.Lstoreslow", "nop", ALT_FACILITY(148) + VSTBRF STATE0,0,,%r2 + VSTBRF STATE1,16,,%r2 + VSTBRF STATE2,32,,%r2 + VSTBRF STATE3,48,,%r2 +.Lstoredone: + + /* ++COPY3.COUNTER */ + /* alsih %r3,1 */ + .insn rilu,0xcc0a00000000,%r3,1 + alcr %r3,%r1 + VLVGG COPY3,%r3,0 + + /* OUTPUT += 64, --NBLOCKS */ + aghi %r2,64 + brctg %r5,.Lblock + + /* COUNTER = COPY3.COUNTER */ + stg %r3,0(%r4) + + /* Zero out potentially sensitive regs */ + VZERO STATE0 + VZERO STATE1 + VZERO STATE2 + VZERO STATE3 + VZERO COPY1 + VZERO COPY2 + + /* Early exit if TMP0-TMP3 have not been used */ + ALTERNATIVE "nopr", "br %r14", ALT_FACILITY(148) + + VZERO TMP0 + VZERO TMP1 + VZERO TMP2 + VZERO TMP3 + + br %r14 + +.Lstoreslow: + /* Convert STATE to little endian format and store to OUTPUT */ + VPERM TMP0,STATE0,STATE0,BEPERM + VPERM TMP1,STATE1,STATE1,BEPERM + VPERM TMP2,STATE2,STATE2,BEPERM + VPERM TMP3,STATE3,STATE3,BEPERM + VSTM TMP0,TMP3,0,%r2 + j .Lstoredone +SYM_FUNC_END(__arch_chacha20_blocks_nostack) diff --git a/arch/s390/kernel/vdso64/vgetrandom.c b/arch/s390/kernel/vdso64/vgetrandom.c new file mode 100644 index 000000000000..b5268b507fb5 --- /dev/null +++ b/arch/s390/kernel/vdso64/vgetrandom.c @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <asm/facility.h> +#include <uapi/asm-generic/errno.h> +#include "vdso.h" + +ssize_t __kernel_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len) +{ + if (test_facility(129)) + return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len); + if (unlikely(opaque_len == ~0UL && !buffer && !len && !flags)) + return -ENOSYS; + return getrandom_syscall(buffer, len, flags); +} |