Le 27/08/2024 à 16:01, Adhemerval Zanella Netto a écrit :
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On 27/08/24 11:00, Christophe Leroy wrote:
Le 27/08/2024 à 15:39, Adhemerval Zanella Netto a écrit :
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On 27/08/24 10:34, Jason A. Donenfeld wrote:
On Tue, Aug 27, 2024 at 10:17:18AM -0300, Adhemerval Zanella Netto wrote:
On 26/08/24 17:27, Jason A. Donenfeld wrote:
Hi Adhemerval,
Thanks for posting this! Exciting to have it here.
Just some small nits for now:
On Mon, Aug 26, 2024 at 06:10:40PM +0000, Adhemerval Zanella wrote:
+static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags)
+{
+ register long int x8 asm ("x8") = __NR_getrandom;
+ register long int x0 asm ("x0") = (long int) buffer;
+ register long int x1 asm ("x1") = (long int) len;
+ register long int x2 asm ("x2") = (long int) flags;
Usually it's written just as `long` or `unsigned long`, and likewise
with the cast. Also, no space after the cast.
Ack.
+#define __VDSO_RND_DATA_OFFSET 480
This is the size of the data currently there?
Yes, I used the same strategy x86 did.
#include <asm/page.h>
#include <asm/vdso.h>
#include <asm-generic/vmlinux.lds.h>
+#include <vdso/datapage.h>
+#include <asm/vdso/vsyscall.h>
Possible to keep the asm/ together?
Ack.
+ * ARM64 ChaCha20 implementation meant for vDSO. Produces a given positive
+ * number of blocks of output with nonnce 0, taking an input key and 8-bytes
nonnce -> nonce
Ack.
-ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
+ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/ -e s/aarch64.*/arm64/)
SODIUM := $(shell pkg-config --libs libsodium 2>/dev/null)
TEST_GEN_PROGS := vdso_test_gettimeofday
@@ -11,7 +11,7 @@ ifeq ($(ARCH),$(filter $(ARCH),x86 x86_64))
TEST_GEN_PROGS += vdso_standalone_test_x86
endif
TEST_GEN_PROGS += vdso_test_correctness
-ifeq ($(uname_M),x86_64)
+ifeq ($(uname_M), $(filter x86_64 aarch64, $(uname_M)))
TEST_GEN_PROGS += vdso_test_getrandom
ifneq ($(SODIUM),)
TEST_GEN_PROGS += vdso_test_chacha
You'll need to add the symlink to get the chacha selftest running:
$ ln -s ../../../arch/arm64/kernel/vdso tools/arch/arm64/vdso
$ git add tools/arch/arm64/vdso
Also, can you confirm that the chacha selftest runs and works?
Yes, last time I has to built it manually since the Makefile machinery seem
to be broken even on x86_64. In a Ubuntu vm I have:
tools/testing/selftests/vDSO$ make
CC vdso_test_gettimeofday
CC vdso_test_getcpu
CC vdso_test_abi
CC vdso_test_clock_getres
CC vdso_standalone_test_x86
CC vdso_test_correctness
CC vdso_test_getrandom
CC vdso_test_chacha
In file included from /home/azanella/Projects/linux/linux-git/include/linux/limits.h:7,
from /usr/include/x86_64-linux-gnu/bits/local_lim.h:38,
from /usr/include/x86_64-linux-gnu/bits/posix1_lim.h:161,
from /usr/include/limits.h:195,
from /usr/lib/gcc/x86_64-linux-gnu/13/include/limits.h:205,
from /usr/lib/gcc/x86_64-linux-gnu/13/include/syslimits.h:7,
from /usr/lib/gcc/x86_64-linux-gnu/13/include/limits.h:34,
from /usr/include/sodium/export.h:7,
from /usr/include/sodium/crypto_stream_chacha20.h:14,
from vdso_test_chacha.c:6:
/usr/include/x86_64-linux-gnu/bits/xopen_lim.h:99:6: error: missing binary operator before token "("
99 | # if INT_MAX == 32767
| ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/xopen_lim.h:102:7: error: missing binary operator before token "("
102 | # if INT_MAX == 2147483647
| ^~~~~~~
/usr/include/x86_64-linux-gnu/bits/xopen_lim.h:126:6: error: missing binary operator before token "("
126 | # if LONG_MAX == 2147483647
| ^~~~~~~~
make: *** [../lib.mk:222: /home/azanella/Projects/linux/linux-git/tools/testing/selftests/vDSO/vdso_test_chacha] Error 1
You get that even with the latest random.git? I thought Christophe's
patch fixed that, but maybe not and I should just remove the dependency
on the sodium header instead.
On x86_64 I tested with Linux master. With random.git it is a different issue:
linux-git/tools/testing/selftests/vDSO$ make
CC vdso_test_gettimeofday
CC vdso_test_getcpu
CC vdso_test_abi
CC vdso_test_clock_getres
CC vdso_standalone_test_x86
CC vdso_test_correctness
CC vdso_test_getrandom
CC vdso_test_chacha
/usr/bin/ld: /tmp/ccKpjnSM.o: in function `main':
vdso_test_chacha.c:(.text+0x276): undefined reference to `crypto_stream_chacha20'
collect2: error: ld returned 1 exit status
If I move -lsodium to the end of the compiler command it works.
Try a "make clean" maybe ?
I have Fedora 38 and no build problem with latest random tree:
$ make V=1
gcc -std=gnu99 -D_GNU_SOURCE= vdso_test_gettimeofday.c parse_vdso.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_gettimeofday
gcc -std=gnu99 -D_GNU_SOURCE= vdso_test_getcpu.c parse_vdso.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_getcpu
gcc -std=gnu99 -D_GNU_SOURCE= vdso_test_abi.c parse_vdso.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_abi
gcc -std=gnu99 -D_GNU_SOURCE= vdso_test_clock_getres.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_clock_getres
gcc -std=gnu99 -D_GNU_SOURCE= -nostdlib -fno-asynchronous-unwind-tables -fno-stack-protector vdso_standalone_test_x86.c parse_vdso.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_standalone_test_x86
gcc -std=gnu99 -D_GNU_SOURCE= -ldl vdso_test_correctness.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_correctness
gcc -std=gnu99 -D_GNU_SOURCE= -isystem /home/chleroy/linux-powerpc/tools/testing/selftests/../../../tools/include -isystem /home/chleroy/linux-powerpc/tools/testing/selftests/../../../include/uapi vdso_test_getrandom.c parse_vdso.c -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_getrandom
gcc -std=gnu99 -D_GNU_SOURCE= -idirafter /home/chleroy/linux-powerpc/tools/testing/selftests/../../../tools/include -idirafter /home/chleroy/linux-powerpc/tools/testing/selftests/../../../arch/x86/include -idirafter /home/chleroy/linux-powerpc/tools/testing/selftests/../../../include -D__ASSEMBLY__ -DBULID_VDSO -DCONFIG_FUNCTION_ALIGNMENT=0 -Wa,--noexecstack -lsodium vdso_test_chacha.c /home/chleroy/linux-powerpc/tools/testing/selftests/../../../tools/arch/x86/vdso/vgetrandom-chacha.S -o /home/chleroy/linux-powerpc/tools/testing/selftests/vDSO/vdso_test_chacha
$
It is a clean tree (git clean -dfx), and I take there is no need to build a kernel
prior hand.
I meeant 'make clean'
Right, I have not built any x86 kernel at the moment.
Just :
$ pwd
/home/chleroy/linux-powerpc/tools/testing/selftests/vDSO
$ make clean
then
$ make V=1
Christophe
