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/*
* Check decoding of listxattrat syscall.
*
* Copyright (c) 2016-2025 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include "xmalloc.h"
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <linux/xattr.h>
#define XLAT_MACROS_ONLY
# include "xlat/xattrat_flags.h"
#undef XLAT_MACROS_ONLY
#ifndef XATTR_LIST_MAX
# define XATTR_LIST_MAX 65536
#endif
#ifndef FD_PATH
# define FD_PATH ""
#else
# define YFLAG
#endif
#ifndef SKIP_IF_PROC_IS_UNAVAILABLE
# define SKIP_IF_PROC_IS_UNAVAILABLE
#endif
static const char *errstr;
static long
k_listxattrat(const unsigned int dirfd,
const void *const pathname,
const unsigned int flags,
const void *const addr,
const unsigned long size)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
const kernel_ulong_t arg1 = fill | dirfd;
const kernel_ulong_t arg2 = (uintptr_t) pathname;
const kernel_ulong_t arg3 = fill | flags;
const kernel_ulong_t arg4 = (uintptr_t) addr;
const kernel_ulong_t arg5 = size;
const long rc = syscall(__NR_listxattrat,
arg1, arg2, arg3, arg4, arg5, bad);
errstr = sprintrc(rc);
return rc;
}
static long
k_setxattrat(const unsigned int dirfd,
const void *const pathname,
const unsigned int flags,
const void *const name,
const void *const args,
const unsigned long size)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t arg1 = fill | dirfd;
const kernel_ulong_t arg2 = (uintptr_t) pathname;
const kernel_ulong_t arg3 = fill | flags;
const kernel_ulong_t arg4 = (uintptr_t) name;
const kernel_ulong_t arg5 = (uintptr_t) args;
const kernel_ulong_t arg6 = size;
const long rc = syscall(__NR_setxattrat,
arg1, arg2, arg3, arg4, arg5, arg6);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
SKIP_IF_PROC_IS_UNAVAILABLE;
TAIL_ALLOC_OBJECT_CONST_PTR(const char, unterminated);
char *unterminated_str = xasprintf("%p", unterminated);
const void *const efault = unterminated + 1;
char *efault_str = xasprintf("%p", efault);
typedef struct {
char sym;
char null;
} sym_null;
TAIL_ALLOC_OBJECT_CONST_PTR(sym_null, dot);
dot->sym = '.';
dot->null = '\0';
const char *const null = &dot->null;
TAIL_ALLOC_OBJECT_CONST_PTR(sym_null, slash);
slash->sym = '/';
slash->null = '\0';
static const char path[] = "/dev/full";
const char *const fd_path = tail_memdup(path, sizeof(path));
int fd = open(path, O_WRONLY);
if (fd < 0)
perror_msg_and_fail("open: %s", path);
char *fd_str = xasprintf("%d%s", fd, FD_PATH);
const char *at_fdcwd_str =
#ifdef YFLAG
xasprintf("AT_FDCWD<%s>", get_fd_path(get_dir_fd(".")));
#else
"AT_FDCWD";
#endif
char *path_quoted = xasprintf("\"%s\"", path);
struct strival32 dirfds[] = {
{ ARG_STR(-1) },
{ -100, at_fdcwd_str },
{ fd, fd_str },
}, flags[] = {
{ ARG_STR(0) },
{ ARG_STR(AT_SYMLINK_NOFOLLOW) },
{ ARG_STR(AT_EMPTY_PATH) },
{ ARG_STR(AT_SYMLINK_NOFOLLOW|AT_EMPTY_PATH) },
{ 1, "0x1 /* AT_??? */" },
{ -1, "AT_SYMLINK_NOFOLLOW|AT_EMPTY_PATH|0xffffeeff" },
};
struct {
const void *val;
const char *str;
} paths[] = {
{ 0, "NULL" },
{ efault, efault_str },
{ unterminated, unterminated_str },
{ null, "\"\"" },
{ &dot->sym, "\".\"" },
{ &slash->sym, "\"/\"" },
{ fd_path, path_quoted },
};
char *const big = tail_alloc(XATTR_LIST_MAX);
void *addrs[] = {
big,
big + XATTR_LIST_MAX
};
const unsigned long sizes[] = {
0,
XATTR_LIST_MAX,
};
static const char c_value[] = {'f', 'o', 'o', '\0', 'b', 'a', 'r'};
struct xattr_args args = {
.value = (uintptr_t) c_value,
.size = sizeof(c_value)
};
k_setxattrat(-100, ".", 0, "user.strace.test.listxattrat",
&args, sizeof(args));
for (unsigned int dirfd_i = 0;
dirfd_i < ARRAY_SIZE(dirfds);
++dirfd_i) {
for (unsigned int path_i = 0;
path_i < ARRAY_SIZE(paths);
++path_i) {
for (unsigned int flag_i = 0;
flag_i < ARRAY_SIZE(flags);
++flag_i) {
for (unsigned int addr_i = 0;
addr_i < ARRAY_SIZE(addrs);
++addr_i) {
for (unsigned int size_i = 0;
size_i < ARRAY_SIZE(sizes);
++size_i) {
long rc = k_listxattrat(dirfds[dirfd_i].val,
paths[path_i].val,
flags[flag_i].val,
addrs[addr_i],
sizes[size_i]);
#ifdef PATH_TRACING
if (dirfds[dirfd_i].val == fd ||
paths[path_i].val == fd_path)
#endif
{
printf("listxattrat(%s, %s, %s, ",
dirfds[dirfd_i].str,
paths[path_i].str,
flags[flag_i].str);
if (rc < 0 || sizes[size_i] == 0)
printf("%p", addrs[addr_i]);
else {
const int ellipsis =
rc > DEFAULT_STRLEN;
const size_t size =
ellipsis ? DEFAULT_STRLEN : rc;
print_quoted_memory(addrs[addr_i],
size);
if (ellipsis)
fputs("...", stdout);
}
printf(", %lu) = %s\n",
sizes[size_i], errstr);
}
}
}
}
}
}
puts("+++ exited with 0 +++");
return 0;
}
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