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selftests/bpf: Add unit tests for new sign-extension mov insns

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Add unit tests for movsx insns.

Signed-off-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20230728011309.3719295-1-yonghong.song@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Yonghong Song
2023-07-27 18:13:09 -07:00
committed by Alexei Starovoitov
parent 147c8f4470
commit f02ec3ff3f
2 changed files with 215 additions and 0 deletions
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2
tools/testing/selftests/bpf/prog_tests/verifier.c
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@@ -41,6 +41,7 @@
#include "verifier_map_ret_val.skel.h"
#include "verifier_masking.skel.h"
#include "verifier_meta_access.skel.h"
#include "verifier_movsx.skel.h"
#include "verifier_netfilter_ctx.skel.h"
#include "verifier_netfilter_retcode.skel.h"
#include "verifier_prevent_map_lookup.skel.h"
@@ -144,6 +145,7 @@ void test_verifier_map_ptr_mixing(void) { RUN(verifier_map_ptr_mixing); }
void test_verifier_map_ret_val(void) { RUN(verifier_map_ret_val); }
void test_verifier_masking(void) { RUN(verifier_masking); }
void test_verifier_meta_access(void) { RUN(verifier_meta_access); }
void test_verifier_movsx(void) { RUN(verifier_movsx); }
void test_verifier_netfilter_ctx(void) { RUN(verifier_netfilter_ctx); }
void test_verifier_netfilter_retcode(void) { RUN(verifier_netfilter_retcode); }
void test_verifier_prevent_map_lookup(void) { RUN(verifier_prevent_map_lookup); }

213
tools/testing/selftests/bpf/progs/verifier_movsx.c Normal file
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@@ -0,0 +1,213 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
#if defined(__TARGET_ARCH_x86) && __clang_major__ >= 18
SEC("socket")
__description("MOV32SX, S8")
__success __success_unpriv __retval(0x23)
__naked void mov32sx_s8(void)
{
asm volatile (" \
w0 = 0xff23; \
w0 = (s8)w0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("MOV32SX, S16")
__success __success_unpriv __retval(0xFFFFff23)
__naked void mov32sx_s16(void)
{
asm volatile (" \
w0 = 0xff23; \
w0 = (s16)w0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("MOV64SX, S8")
__success __success_unpriv __retval(-2)
__naked void mov64sx_s8(void)
{
asm volatile (" \
r0 = 0x1fe; \
r0 = (s8)r0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("MOV64SX, S16")
__success __success_unpriv __retval(0xf23)
__naked void mov64sx_s16(void)
{
asm volatile (" \
r0 = 0xf0f23; \
r0 = (s16)r0; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("MOV64SX, S32")
__success __success_unpriv __retval(-1)
__naked void mov64sx_s32(void)
{
asm volatile (" \
r0 = 0xfffffffe; \
r0 = (s32)r0; \
r0 >>= 1; \
exit; \
" ::: __clobber_all);
}
SEC("socket")
__description("MOV32SX, S8, range_check")
__success __success_unpriv __retval(1)
__naked void mov32sx_s8_range(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
w1 = (s8)w0; \
/* w1 with s8 range */ \
if w1 s> 0x7f goto l0_%=; \
if w1 s< -0x80 goto l0_%=; \
r0 = 1; \
l1_%=: \
exit; \
l0_%=: \
r0 = 2; \
goto l1_%=; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("MOV32SX, S16, range_check")
__success __success_unpriv __retval(1)
__naked void mov32sx_s16_range(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
w1 = (s16)w0; \
/* w1 with s16 range */ \
if w1 s> 0x7fff goto l0_%=; \
if w1 s< -0x80ff goto l0_%=; \
r0 = 1; \
l1_%=: \
exit; \
l0_%=: \
r0 = 2; \
goto l1_%=; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("MOV32SX, S16, range_check 2")
__success __success_unpriv __retval(1)
__naked void mov32sx_s16_range_2(void)
{
asm volatile (" \
r1 = 65535; \
w2 = (s16)w1; \
r2 >>= 1; \
if r2 != 0x7fffFFFF goto l0_%=; \
r0 = 1; \
l1_%=: \
exit; \
l0_%=: \
r0 = 0; \
goto l1_%=; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("MOV64SX, S8, range_check")
__success __success_unpriv __retval(1)
__naked void mov64sx_s8_range(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = (s8)r0; \
/* r1 with s8 range */ \
if r1 s> 0x7f goto l0_%=; \
if r1 s< -0x80 goto l0_%=; \
r0 = 1; \
l1_%=: \
exit; \
l0_%=: \
r0 = 2; \
goto l1_%=; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("MOV64SX, S16, range_check")
__success __success_unpriv __retval(1)
__naked void mov64sx_s16_range(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = (s16)r0; \
/* r1 with s16 range */ \
if r1 s> 0x7fff goto l0_%=; \
if r1 s< -0x8000 goto l0_%=; \
r0 = 1; \
l1_%=: \
exit; \
l0_%=: \
r0 = 2; \
goto l1_%=; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("MOV64SX, S32, range_check")
__success __success_unpriv __retval(1)
__naked void mov64sx_s32_range(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r1 = (s32)r0; \
/* r1 with s32 range */ \
if r1 s> 0x7fffffff goto l0_%=; \
if r1 s< -0x80000000 goto l0_%=; \
r0 = 1; \
l1_%=: \
exit; \
l0_%=: \
r0 = 2; \
goto l1_%=; \
" :
: __imm(bpf_get_prandom_u32)
: __clobber_all);
}
#else
SEC("socket")
__description("cpuv4 is not supported by compiler or jit, use a dummy test")
__success
int dummy_test(void)
{
return 0;
}
#endif
char _license[] SEC("license") = "GPL";