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/*
* Check decoding of lsm_get_self_attr syscall.
*
* Copyright (c) 2024 Dmitry V. Levin <ldv@strace.io>
* All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "tests.h"
#include "scno.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <linux/lsm.h>
#ifdef INJECT_RETVAL
# define INJ_STR " (INJECTED)\n"
#else
# define INJ_STR "\n"
#endif
static const kernel_ulong_t bad = (kernel_ulong_t) 0xbadc0dedbadc0dedULL;
static const char *errstr;
static long
k_lsm_get_self_attr(const unsigned int attr, const void *p_ctx,
const void *p_size, const uint32_t flags)
{
const kernel_ulong_t fill = (kernel_ulong_t) 0xdefaced00000000ULL;
const kernel_ulong_t arg1 = fill | attr;
const kernel_ulong_t arg2 = (uintptr_t) p_ctx;
const kernel_ulong_t arg3 = (uintptr_t) p_size;
const kernel_ulong_t arg4 = fill | flags;
const long rc = syscall(__NR_lsm_get_self_attr,
arg1, arg2, arg3, arg4, bad, bad);
errstr = sprintrc(rc);
return rc;
}
int
main(void)
{
k_lsm_get_self_attr(0, 0, 0, 0);
printf("lsm_get_self_attr(LSM_ATTR_UNDEF, NULL, NULL, 0) = %s" INJ_STR,
errstr);
struct lsm_ctx *const ctx =
midtail_alloc(sizeof(*ctx), 2 * sizeof(*ctx));
fill_memory(ctx, sizeof(*ctx));
const void *const bad_ctx = (void *) ctx + 1;
TAIL_ALLOC_OBJECT_CONST_PTR(uint32_t, size);
const void *const bad_size = (void *) size + 1;
const unsigned int bad_attr = 0xfacefed1;
const uint32_t bad_flags = 0xfacefed2;
k_lsm_get_self_attr(bad_attr, bad_ctx, bad_size, bad_flags);
printf("lsm_get_self_attr(%#x /* LSM_ATTR_??? */, %p, %p"
", %#x /* LSM_FLAG_??? */) = %s" INJ_STR,
bad_attr, bad_ctx, bad_size, bad_flags, errstr);
k_lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, bad_size, 0);
printf("lsm_get_self_attr(%s, %p, %p, 0) = %s" INJ_STR,
"LSM_ATTR_CURRENT", ctx, bad_size, errstr);
*size = 0xdeadbeef;
k_lsm_get_self_attr(LSM_ATTR_EXEC, bad_ctx, size, 1);
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s" INJ_STR,
"LSM_ATTR_EXEC", bad_ctx, *size, "LSM_FLAG_SINGLE", errstr);
k_lsm_get_self_attr(LSM_ATTR_FSCREATE, bad_ctx, size, 2);
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s" INJ_STR,
"LSM_ATTR_FSCREATE", bad_ctx, *size, "0x2 /* LSM_FLAG_??? */",
errstr);
*size = sizeof(*ctx) - 1;
k_lsm_get_self_attr(LSM_ATTR_KEYCREATE, ctx, size, 3);
printf("lsm_get_self_attr(%s, {id=%#jx} => %p, [%u], %s) = %s" INJ_STR,
"LSM_ATTR_KEYCREATE", (uintmax_t) ctx->id, ctx, *size,
"LSM_FLAG_SINGLE|0x2", errstr);
*size = sizeof(*ctx) + 1;
ctx->id = 0;
if (k_lsm_get_self_attr(LSM_ATTR_PREV, ctx, size, 4) < 0)
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s" INJ_STR,
"LSM_ATTR_PREV", ctx, *size, "0x4 /* LSM_FLAG_??? */",
errstr);
else
printf("lsm_get_self_attr(%s, [{id=%s, flags=%#jx, len=%ju"
", ctx_len=%ju, ctx=%p}], [%u], %s) = %s" INJ_STR,
"LSM_ATTR_PREV", "LSM_ID_UNDEF", (uintmax_t) ctx->flags,
(uintmax_t) ctx->len, (uintmax_t) ctx->ctx_len, ctx->ctx,
*size, "0x4 /* LSM_FLAG_??? */", errstr);
*size = sizeof(*ctx);
ctx->id = LSM_ID_CAPABILITY;
if (k_lsm_get_self_attr(LSM_ATTR_SOCKCREATE, ctx, size, 5) < 0)
printf("lsm_get_self_attr(%s, {id=%s} => %p, [%u], %s) = %s"
INJ_STR, "LSM_ATTR_SOCKCREATE", "LSM_ID_CAPABILITY",
ctx, *size, "LSM_FLAG_SINGLE|0x4", errstr);
else
printf("lsm_get_self_attr(%s, {id=%s} => [{id=%s, flags=%#jx"
", len=%ju, ctx_len=%ju}], [%u], %s) = %s" INJ_STR,
"LSM_ATTR_SOCKCREATE", "LSM_ID_CAPABILITY",
"LSM_ID_CAPABILITY", (uintmax_t) ctx->flags,
(uintmax_t) ctx->len, (uintmax_t) ctx->ctx_len,
*size, "LSM_FLAG_SINGLE|0x4", errstr);
*size = 3 * sizeof(*ctx) + 1;
ctx->id = LSM_ID_SELINUX;
ctx->len = sizeof(*ctx) + 1;
if (k_lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, size, 6) < 0)
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", ctx, *size,
"0x6 /* LSM_FLAG_??? */", errstr);
else
printf("lsm_get_self_attr(%s, [{id=%s, flags=%#jx"
", len=%ju, ctx_len=%ju, ctx=%p}, ... /* %p */], [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", "LSM_ID_SELINUX",
(uintmax_t) ctx->flags, (uintmax_t) ctx->len,
(uintmax_t) ctx->ctx_len, ctx->ctx,
(void *) (ctx + 1) + 1, *size,
"0x6 /* LSM_FLAG_??? */", errstr);
ctx->len = *size + 1;
if (k_lsm_get_self_attr(LSM_ATTR_CURRENT, ctx, size, 6) < 0)
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", ctx, *size,
"0x6 /* LSM_FLAG_??? */", errstr);
else
printf("lsm_get_self_attr(%s, [{id=%s, flags=%#jx"
", len=%ju, ctx_len=%ju, ctx=%p}], [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", "LSM_ID_SELINUX",
(uintmax_t) ctx->flags, (uintmax_t) ctx->len,
(uintmax_t) ctx->ctx_len, ctx->ctx,
*size, "0x6 /* LSM_FLAG_??? */", errstr);
ctx->len = -1;
memcpy(ctx - 1, ctx, sizeof(*ctx));
fill_memory(ctx, sizeof(*ctx));
if (k_lsm_get_self_attr(LSM_ATTR_CURRENT, ctx - 1, size, 8) < 0)
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", ctx - 1, *size,
"0x8 /* LSM_FLAG_??? */", errstr);
else
printf("lsm_get_self_attr(%s, [{id=%s, flags=%#jx"
", len=%ju, ctx_len=%ju, ctx=\"\\x%x\\x%x\"...}]"
", [%u], %s) = %s" INJ_STR,
"LSM_ATTR_CURRENT", "LSM_ID_SELINUX",
(uintmax_t) (ctx - 1)->flags, (uintmax_t) (ctx - 1)->len,
(uintmax_t) (ctx - 1)->ctx_len, * (unsigned char *) ctx,
* ((unsigned char *) ctx + 1), *size,
"0x8 /* LSM_FLAG_??? */", errstr);
(ctx - 1)->len = sizeof(*ctx) - 1;
if (k_lsm_get_self_attr(LSM_ATTR_CURRENT, ctx - 1, size, 16) < 0)
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", ctx - 1, *size,
"0x10 /* LSM_FLAG_??? */", errstr);
else
printf("lsm_get_self_attr(%s, [{id=%s, flags=%#jx"
", len=%ju, ctx_len=%ju}], [%u], %s) = %s" INJ_STR,
"LSM_ATTR_CURRENT", "LSM_ID_SELINUX",
(uintmax_t) (ctx - 1)->flags, (uintmax_t) (ctx - 1)->len,
(uintmax_t) (ctx - 1)->ctx_len, *size,
"0x10 /* LSM_FLAG_??? */", errstr);
fill_memory(ctx - 2, 3 * sizeof(*ctx));
(ctx - 2)->id = LSM_ID_CAPABILITY;
(ctx - 2)->len = sizeof(*ctx);
ctx->id = LSM_ID_SELINUX;
(ctx - 1)->id = LSM_ID_SELINUX;
(ctx - 1)->len = sizeof(*ctx);
if (k_lsm_get_self_attr(LSM_ATTR_CURRENT, ctx - 2, size, 32) < 0)
printf("lsm_get_self_attr(%s, %p, [%u], %s) = %s"
INJ_STR, "LSM_ATTR_CURRENT", ctx - 2, *size,
"0x20 /* LSM_FLAG_??? */", errstr);
else
printf("lsm_get_self_attr(%s"
", [{id=%s, flags=%#jx, len=%ju, ctx_len=%ju}"
", {id=%s, flags=%#jx, len=%ju, ctx_len=%ju}"
", ...], [%u], %s) = %s" INJ_STR,
"LSM_ATTR_CURRENT",
"LSM_ID_CAPABILITY", (uintmax_t) (ctx - 2)->flags,
(uintmax_t) (ctx - 2)->len,
(uintmax_t) (ctx - 2)->ctx_len,
"LSM_ID_SELINUX", (uintmax_t) (ctx - 1)->flags,
(uintmax_t) (ctx - 1)->len,
(uintmax_t) (ctx - 1)->ctx_len,
*size, "0x20 /* LSM_FLAG_??? */", errstr);
puts("+++ exited with 0 +++");
return 0;
}
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