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/*
* Check decoding of arch_prctl syscall.
*
* Copyright (c) 2021-2022 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#ifdef __NR_arch_prctl
# include <stdio.h>
# include <stdlib.h>
# include <unistd.h>
# include <linux/prctl.h>
# define XLAT_MACROS_ONLY
# include "xlat/archvals.h"
# undef XLAT_MACROS_ONLY
# include "xlat.h"
# include "xlat/x86_xfeature_bits.h"
# include "xlat/x86_xfeatures.h"
# ifdef INJECT_RETVAL
# define INJ_STR " (INJECTED)\n"
# else
# define INJ_STR "\n"
# endif
# define ARRAY_END(a_) ((a_) + ARRAY_SIZE(a_))
static long
sys_arch_prctl(unsigned int cmd, kernel_ulong_t arg)
{
return syscall(__NR_arch_prctl, cmd, arg, (unsigned long) -3U,
(unsigned long) -4U,
(unsigned long) -5U);
}
static long
arch_prctl_marker(void)
{
return sys_arch_prctl(-1U, (unsigned long) -2U);
}
int
main(int argc, char *argv[])
{
const kernel_ulong_t dummy = (kernel_ulong_t) 0xbadfaceddeadbeefULL;
const char *errstr;
long rc;
arch_prctl_marker();
# ifdef INJECT_RETVAL
unsigned long num_skip;
long inject_retval;
bool locked = false;
if (argc < 3)
error_msg_and_fail("Usage: %s NUM_SKIP INJECT_RETVAL", argv[0]);
num_skip = strtoul(argv[1], NULL, 0);
inject_retval = strtol(argv[2], NULL, 0);
for (size_t i = 0; i < num_skip; i++) {
if (arch_prctl_marker() != inject_retval)
continue;
locked = true;
break;
}
if (!locked)
error_msg_and_fail("Have not locked on arch_prctl(-1, -2)"
" returning %ld", inject_retval);
# endif /* INJECT_RETVAL */
TAIL_ALLOC_OBJECT_CONST_PTR(uint64_t, u64_p);
/* Unknown commands */
static const uint32_t unk_cmds[] = {
0, 0x1,
0x1000, 0x1005,
0x1010, 0x1013,
0x1020, 0x1026,
0x1030, 0x1031,
0x1100, 0x1101,
0x2000, 0x2004,
0x2010, 0x2011,
0x2100, 0x2101,
0x3000, 0x3001,
0xdeadc0de };
for (size_t i = 0; i < ARRAY_SIZE(unk_cmds); i++) {
rc = sys_arch_prctl(unk_cmds[i], 0);
printf("arch_prctl(" XLAT_UNKNOWN_FMT("%#x", "ARCH_???")
", 0) = %s" INJ_STR,
unk_cmds[i], sprintrc(rc));
rc = sys_arch_prctl(unk_cmds[i], (kernel_ulong_t) dummy);
printf("arch_prctl(" XLAT_UNKNOWN_FMT("%#x", "ARCH_???")
", %#llx) = %s" INJ_STR,
unk_cmds[i], (unsigned long long) dummy, sprintrc(rc));
rc = sys_arch_prctl(unk_cmds[i], (uintptr_t) u64_p);
printf("arch_prctl(" XLAT_UNKNOWN_FMT("%#x", "ARCH_???")
", %p) = %s" INJ_STR,
unk_cmds[i], u64_p, sprintrc(rc));
}
/* Default decoding */
static const struct strval32 def_cmds[] = {
{ ARG_XLAT_KNOWN(0x1001, "ARCH_SET_GS") },
# ifdef INJECT_RETVAL
{ ARG_XLAT_KNOWN(0x1002, "ARCH_SET_FS") },
# endif
{ ARG_XLAT_KNOWN(0x1012, "ARCH_SET_CPUID") },
{ ARG_XLAT_KNOWN(0x2001, "ARCH_MAP_VDSO_X32") },
{ ARG_XLAT_KNOWN(0x2002, "ARCH_MAP_VDSO_32") },
{ ARG_XLAT_KNOWN(0x2003, "ARCH_MAP_VDSO_64") },
};
for (const struct strval32 *p = def_cmds; p < ARRAY_END(def_cmds); p++)
{
rc = sys_arch_prctl(p->val, (kernel_ulong_t) dummy);
printf("arch_prctl(%s, %#llx) = %s" INJ_STR,
p->str, (unsigned long long) dummy, sprintrc(rc));
rc = sys_arch_prctl(p->val, (uintptr_t) u64_p);
printf("arch_prctl(%s, %p) = %s" INJ_STR,
p->str, u64_p, sprintrc(rc));
rc = sys_arch_prctl(p->val, 0);
printf("arch_prctl(%s, 0) = %s" INJ_STR, p->str, sprintrc(rc));
}
/* ARCH_GET_GS, ARCH_GET_FS */
static const struct strval32 kptr_cmds[] = {
# ifdef INJECT_RETVAL
{ ARG_XLAT_KNOWN(0x1003, "ARCH_GET_FS") },
# endif
{ ARG_XLAT_KNOWN(0x1004, "ARCH_GET_GS") },
};
TAIL_ALLOC_OBJECT_CONST_PTR(kernel_ulong_t, kulong_p);
const kernel_ulong_t ptrs[] = {
(kernel_ulong_t) 0xdeadfacecafebeefULL,
(uintptr_t) (kulong_p + 1),
(uintptr_t) kulong_p ,
0
};
for (const struct strval32 *p = kptr_cmds; p < ARRAY_END(kptr_cmds);
p++) {
rc = sys_arch_prctl(p->val, 0);
printf("arch_prctl(%s, NULL) = %s" INJ_STR,
p->str, sprintrc(rc));
rc = sys_arch_prctl(p->val, (uintptr_t) (kulong_p + 1));
printf("arch_prctl(%s, %p) = %s" INJ_STR,
p->str, kulong_p + 1, sprintrc(rc));
for (size_t j = 0; j < ARRAY_SIZE(ptrs); j++) {
*kulong_p = ptrs[j];
uint32_t wr_cmd = p->val == ARCH_GET_GS ? ARCH_SET_GS
: ARCH_SET_FS;
# if !XLAT_RAW
const char *wr_str = p->val == ARCH_GET_GS
? "ARCH_SET_GS" : "ARCH_SET_FS";
# endif
rc = sys_arch_prctl(wr_cmd, *kulong_p);
printf("arch_prctl(" XLAT_FMT ", %#llx) = %s" INJ_STR,
XLAT_SEL(wr_cmd, wr_str),
(unsigned long long) *kulong_p, sprintrc(rc));
rc = sys_arch_prctl(p->val, (uintptr_t) kulong_p);
errstr = sprintrc(rc);
printf("arch_prctl(%s, ", p->str);
if (rc >= 0) {
if (*kulong_p) {
printf("[%#llx]",
(unsigned long long) *kulong_p);
} else {
printf("[NULL]");
}
} else {
printf("%p", kulong_p);
}
printf(") = %s" INJ_STR, errstr);
}
}
/* ARCH_GET_CPUID */
rc = sys_arch_prctl(ARCH_GET_CPUID, 0xdeadc0de);
printf("arch_prctl(" XLAT_FMT ") = %s" INJ_STR,
XLAT_ARGS(ARCH_GET_CPUID), sprintrc(rc));
/* xfeature mask get */
static const struct strval32 xfget_cmds[] = {
{ ARG_XLAT_KNOWN(0x1021, "ARCH_GET_XCOMP_SUPP") },
{ ARG_XLAT_KNOWN(0x1022, "ARCH_GET_XCOMP_PERM") },
{ ARG_XLAT_KNOWN(0x1024, "ARCH_GET_XCOMP_GUEST_PERM") },
};
static const struct strval64 xfget_vals[] = {
{ ARG_STR(0) },
{ ARG_XLAT_UNKNOWN(0x1, "XFEATURE_MASK_FP") },
{ ARG_XLAT_UNKNOWN(0x2, "XFEATURE_MASK_SSE") },
{ ARG_XLAT_UNKNOWN(0x3, "XFEATURE_MASK_FPSSE") },
{ ARG_XLAT_UNKNOWN(0x20, "XFEATURE_MASK_OPMASK") },
{ ARG_XLAT_UNKNOWN(0xc0, "XFEATURE_MASK_ZMM_Hi256"
"|XFEATURE_MASK_Hi16_ZMM") },
{ ARG_XLAT_UNKNOWN(0xe0, "XFEATURE_MASK_AVX512") },
{ ARG_XLAT_UNKNOWN(0x20000, "XFEATURE_MASK_XTILE_CFG") },
{ ARG_XLAT_UNKNOWN(0x40000, "XFEATURE_MASK_XTILE_DATA") },
{ ARG_XLAT_UNKNOWN(0x60000, "XFEATURE_MASK_XTILE") },
{ ARG_XLAT_UNKNOWN(0xbadfaced,
"XFEATURE_MASK_FP|XFEATURE_MASK_YMM"
"|XFEATURE_MASK_BNDREGS|XFEATURE_MASK_AVX512"
"|XFEATURE_MASK_PASID|XFEATURE_MASK_LBR"
"|XFEATURE_MASK_XTILE|0xbad92800") },
{ ARG_XLAT_UNKNOWN(0x687ff,
"XFEATURE_MASK_FPSSE|XFEATURE_MASK_YMM"
"|XFEATURE_MASK_BNDREGS|XFEATURE_MASK_BNDCSR"
"|XFEATURE_MASK_AVX512|XFEATURE_MASK_PT"
"|XFEATURE_MASK_PKRU|XFEATURE_MASK_PASID"
"|XFEATURE_MASK_LBR|XFEATURE_MASK_XTILE") },
{ ARG_XLAT_UNKNOWN(0xfffffffffff97800, "XFEATURE_MASK_???") },
};
for (const struct strval32 *p = xfget_cmds; p < ARRAY_END(xfget_cmds);
p++) {
rc = sys_arch_prctl(p->val, 0);
printf("arch_prctl(%s, NULL) = %s" INJ_STR,
p->str, sprintrc(rc));
rc = sys_arch_prctl(p->val, (uintptr_t) (u64_p + 1));
printf("arch_prctl(%s, %p) = %s" INJ_STR,
p->str, u64_p + 1, sprintrc(rc));
for (const struct strval64 *q = xfget_vals;
q < ARRAY_END(xfget_vals); q++) {
*u64_p = q->val;
rc = sys_arch_prctl(p->val, (uintptr_t) u64_p);
errstr = sprintrc(rc);
printf("arch_prctl(%s, ", p->str);
if (rc >= 0) {
# ifdef INJECT_RETVAL
printf("[%s]", q->str);
# else
if (*u64_p) {
printf("[%#llx" NRAW(" /* "),
(unsigned long long) *u64_p);
# if !XLAT_RAW
printflags(x86_xfeatures, *u64_p, NULL);
# endif
printf(NRAW(" */") "]");
} else {
printf("[0]");
}
# endif
} else {
printf("%p", u64_p);
}
printf(") = %s" INJ_STR, errstr);
}
}
/* xfeature in arg, xfeature mask in ret */
static const struct strval32 xfreq_cmds[] = {
{ ARG_XLAT_KNOWN(0x1023, "ARCH_REQ_XCOMP_PERM") },
{ ARG_XLAT_KNOWN(0x1025, "ARCH_REQ_XCOMP_GUEST_PERM") },
};
static const struct strval32 xfreq_vals[] = {
{ ARG_XLAT_UNKNOWN(0, "XFEATURE_FP") },
{ ARG_XLAT_UNKNOWN(0x8, "XFEATURE_PT_UNIMPLEMENTED_SO_FAR") },
{ ARG_XLAT_UNKNOWN(0xb, "XFEATURE_???") },
{ ARG_XLAT_UNKNOWN(0xc, "XFEATURE_???") },
{ ARG_XLAT_UNKNOWN(0xd, "XFEATURE_???") },
{ ARG_XLAT_UNKNOWN(0xe, "XFEATURE_???") },
{ ARG_XLAT_UNKNOWN(0xf, "XFEATURE_LBR") },
{ ARG_XLAT_UNKNOWN(0x10, "XFEATURE_???") },
{ ARG_XLAT_UNKNOWN(0x11, "XFEATURE_XTILE_CFG") },
{ ARG_XLAT_UNKNOWN(0x12, "XFEATURE_XTILE_DATA") },
{ ARG_XLAT_UNKNOWN(0x13, "XFEATURE_???") },
{ ARG_XLAT_UNKNOWN(0xdeadface, "XFEATURE_???") },
};
for (const struct strval32 *p = xfreq_cmds; p < ARRAY_END(xfreq_cmds);
p++) {
for (const struct strval32 *q = xfreq_vals;
q < ARRAY_END(xfreq_vals); q++) {
rc = sys_arch_prctl(p->val, q->val);
errstr = sprintrc(rc);
printf("arch_prctl(%s, %s) = ", p->str, q->str);
if (rc > 0) {
printf("%#lx", rc);
# if !XLAT_RAW
if (rc & x86_xfeatures->flags_mask) {
printf(" (");
printflags(x86_xfeatures, rc, NULL);
printf(")");
}
# endif
printf(INJ_STR);
} else {
printf("%s" INJ_STR, errstr);
}
}
}
puts("+++ exited with 0 +++");
return 0;
}
#else
SKIP_MAIN_UNDEFINED("__NR_arch_prctl")
#endif
|
