144 lines
3.0 KiB
C
144 lines
3.0 KiB
C
/*
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* Copyright (c) 2000 Wichert Akkerman <wakkerma@debian.org>
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* Copyright (c) 2011 Denys Vlasenko <dvlasenk@redhat.com>
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* Copyright (c) 2005-2015 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2014-2018 The strace developers.
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* All rights reserved.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "defs.h"
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/* these constants are the same as in <linux/capability.h> */
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enum {
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#include "caps0.h"
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};
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#include "xlat/cap_mask0.h"
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/* these constants are CAP_TO_INDEX'ed constants from <linux/capability.h> */
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enum {
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#include "caps1.h"
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};
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#include "xlat/cap_mask1.h"
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/* these constants are the same as in <linux/capability.h> */
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enum {
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_LINUX_CAPABILITY_VERSION_1 = 0x19980330,
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_LINUX_CAPABILITY_VERSION_2 = 0x20071026,
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_LINUX_CAPABILITY_VERSION_3 = 0x20080522
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};
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#include "xlat/cap_version.h"
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struct user_cap_header_struct {
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uint32_t version;
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int pid;
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};
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struct user_cap_data_struct {
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uint32_t effective;
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uint32_t permitted;
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uint32_t inheritable;
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};
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static const struct user_cap_header_struct *
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get_cap_header(struct tcb *const tcp, const kernel_ulong_t addr)
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{
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static struct user_cap_header_struct header;
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if (!addr || !verbose(tcp))
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return NULL;
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if (umove(tcp, addr, &header) < 0)
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return NULL;
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return &header;
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}
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static void
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print_cap_header(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct user_cap_header_struct *const h)
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{
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if (!addr || !h) {
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printaddr(addr);
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return;
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}
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tprints("{version=");
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printxval(cap_version, h->version,
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"_LINUX_CAPABILITY_VERSION_???");
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tprintf(", pid=%d}", h->pid);
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}
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static void
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print_cap_bits(const uint32_t lo, const uint32_t hi)
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{
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if (lo || !hi)
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printflags(cap_mask0, lo, "CAP_???");
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if (hi) {
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if (lo)
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tprints("|");
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printflags(cap_mask1, hi, "CAP_???");
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}
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}
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static void
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print_cap_data(struct tcb *const tcp, const kernel_ulong_t addr,
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const struct user_cap_header_struct *const h)
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{
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struct user_cap_data_struct data[2];
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unsigned int len;
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if (!addr || !h) {
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printaddr(addr);
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return;
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}
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if (_LINUX_CAPABILITY_VERSION_2 == h->version ||
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_LINUX_CAPABILITY_VERSION_3 == h->version)
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len = 2;
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else
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len = 1;
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if (umoven_or_printaddr(tcp, addr, len * sizeof(data[0]), data))
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return;
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tprints("{effective=");
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print_cap_bits(data[0].effective, len > 1 ? data[1].effective : 0);
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tprints(", permitted=");
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print_cap_bits(data[0].permitted, len > 1 ? data[1].permitted : 0);
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tprints(", inheritable=");
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print_cap_bits(data[0].inheritable, len > 1 ? data[1].inheritable : 0);
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tprints("}");
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}
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SYS_FUNC(capget)
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{
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const struct user_cap_header_struct *h;
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if (entering(tcp)) {
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h = get_cap_header(tcp, tcp->u_arg[0]);
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print_cap_header(tcp, tcp->u_arg[0], h);
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tprints(", ");
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} else {
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h = syserror(tcp) ? NULL : get_cap_header(tcp, tcp->u_arg[0]);
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print_cap_data(tcp, tcp->u_arg[1], h);
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}
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return 0;
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}
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SYS_FUNC(capset)
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{
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const struct user_cap_header_struct *const h =
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get_cap_header(tcp, tcp->u_arg[0]);
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print_cap_header(tcp, tcp->u_arg[0], h);
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tprints(", ");
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print_cap_data(tcp, tcp->u_arg[1], h);
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return RVAL_DECODED;
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}
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