Dmitry V. Levin
850ba4b1e9
With this change, printnum_* printers will not attempt to fetch data in case of exiting(tcp) && syserror(tcp). All "at exiting" decoders that call these printers have been made ready for this change in previous commits. * util.c (DEF_PRINTNUM, DEF_PRINTPAIR): Use umove_or_printaddr. * prctl.c (prctl_exit): Use printnum_int and printnum_long. (sys_arch_prctl): Do not check for syserror.
302 lines
6.1 KiB
C
302 lines
6.1 KiB
C
#include "defs.h"
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#include <sys/prctl.h>
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#include "xlat/prctl_options.h"
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#include "xlat/pr_unalign_flags.h"
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#include "xlat/pr_mce_kill.h"
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#include "xlat/pr_mce_kill_policy.h"
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#include "xlat/pr_set_mm.h"
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#include "xlat/pr_tsc.h"
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#ifndef TASK_COMM_LEN
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# define TASK_COMM_LEN 16
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#endif
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#ifdef HAVE_LINUX_SECCOMP_H
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# include <linux/seccomp.h>
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#endif
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#include "xlat/seccomp_mode.h"
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#ifdef HAVE_LINUX_SECUREBITS_H
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# include <linux/securebits.h>
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#endif
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#include "xlat/secbits.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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#include "caps1.h"
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};
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#include "xlat/cap.h"
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static int
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prctl_enter(struct tcb *tcp)
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{
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unsigned int i;
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printxval(prctl_options, tcp->u_arg[0], "PR_???");
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switch (tcp->u_arg[0]) {
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/* PR_GET_* are decoded on exit. */
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case PR_GET_CHILD_SUBREAPER:
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case PR_GET_DUMPABLE:
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case PR_GET_ENDIAN:
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case PR_GET_FPEMU:
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case PR_GET_FPEXC:
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case PR_GET_KEEPCAPS:
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case PR_GET_NAME:
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case PR_GET_PDEATHSIG:
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case PR_GET_SECCOMP:
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case PR_GET_SECUREBITS:
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case PR_GET_TID_ADDRESS:
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case PR_GET_TIMERSLACK:
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case PR_GET_TIMING:
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case PR_GET_TSC:
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case PR_GET_UNALIGN:
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/* PR_TASK_PERF_EVENTS_* have nothing to decode on enter. */
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case PR_TASK_PERF_EVENTS_DISABLE:
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case PR_TASK_PERF_EVENTS_ENABLE:
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break;
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case PR_SET_CHILD_SUBREAPER:
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case PR_SET_DUMPABLE:
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case PR_SET_ENDIAN:
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case PR_SET_FPEMU:
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case PR_SET_FPEXC:
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case PR_SET_KEEPCAPS:
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case PR_SET_TIMING:
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tprintf(", %lu", tcp->u_arg[1]);
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break;
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case PR_CAPBSET_DROP:
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case PR_CAPBSET_READ:
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tprints(", ");
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printxval(cap, tcp->u_arg[1], "CAP_???");
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break;
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case PR_MCE_KILL:
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tprints(", ");
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printxval(pr_mce_kill, tcp->u_arg[1], "PR_MCE_KILL_???");
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tprints(", ");
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if (PR_MCE_KILL_SET == tcp->u_arg[1])
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printxval(pr_mce_kill_policy, tcp->u_arg[2],
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"PR_MCE_KILL_???");
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else
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tprintf("%#lx", tcp->u_arg[2]);
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for (i = 3; i < tcp->s_ent->nargs; i++)
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tprintf(", %#lx", tcp->u_arg[i]);
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break;
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case PR_SET_NAME:
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tprints(", ");
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printstr(tcp, tcp->u_arg[1], TASK_COMM_LEN);
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break;
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case PR_SET_MM:
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tprints(", ");
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printxval(pr_set_mm, tcp->u_arg[1], "PR_SET_MM_???");
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for (i = 2; i < tcp->s_ent->nargs; i++)
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tprintf(", %#lx", tcp->u_arg[i]);
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break;
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case PR_SET_PDEATHSIG:
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tprints(", ");
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if ((unsigned long) tcp->u_arg[1] > 128)
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tprintf("%lu", tcp->u_arg[1]);
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else
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tprints(signame(tcp->u_arg[1]));
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break;
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case PR_SET_PTRACER:
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tprints(", ");
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if (tcp->u_arg[1] == -1)
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tprints("PR_SET_PTRACER_ANY");
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else
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tprintf("%lu", tcp->u_arg[1]);
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break;
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case PR_SET_SECCOMP:
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tprints(", ");
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printxval(seccomp_mode, tcp->u_arg[1],
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"SECCOMP_MODE_???");
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if (SECCOMP_MODE_STRICT == tcp->u_arg[1])
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break;
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if (SECCOMP_MODE_FILTER == tcp->u_arg[1]) {
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tprints(", ");
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print_seccomp_filter(tcp, tcp->u_arg[2]);
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break;
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}
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for (i = 2; i < tcp->s_ent->nargs; i++)
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tprintf(", %#lx", tcp->u_arg[i]);
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break;
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case PR_SET_SECUREBITS:
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tprints(", ");
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printflags(secbits, tcp->u_arg[1], "SECBIT_???");
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break;
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case PR_SET_TIMERSLACK:
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tprintf(", %ld", tcp->u_arg[1]);
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break;
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case PR_SET_TSC:
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tprints(", ");
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printxval(pr_tsc, tcp->u_arg[1], "PR_TSC_???");
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break;
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case PR_SET_UNALIGN:
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tprints(", ");
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printflags(pr_unalign_flags, tcp->u_arg[1], "PR_UNALIGN_???");
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break;
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case PR_SET_NO_NEW_PRIVS:
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case PR_SET_THP_DISABLE:
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tprintf(", %lu", tcp->u_arg[1]);
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for (i = 2; i < tcp->s_ent->nargs; i++)
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tprintf(", %#lx", tcp->u_arg[i]);
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break;
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case PR_GET_NO_NEW_PRIVS:
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case PR_GET_THP_DISABLE:
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case PR_MCE_KILL_GET:
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/* Return code of "GET" commands will be decoded on exit */
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case PR_MPX_DISABLE_MANAGEMENT:
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case PR_MPX_ENABLE_MANAGEMENT:
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default:
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for (i = 1; i < tcp->s_ent->nargs; i++)
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tprintf(", %#lx", tcp->u_arg[i]);
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break;
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}
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return 0;
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}
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static int
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prctl_exit(struct tcb *tcp)
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{
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unsigned int i;
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switch (tcp->u_arg[0]) {
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case PR_CAPBSET_READ:
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case PR_GET_DUMPABLE:
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case PR_GET_KEEPCAPS:
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case PR_GET_NO_NEW_PRIVS:
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case PR_GET_SECCOMP:
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case PR_GET_THP_DISABLE:
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case PR_GET_TIMERSLACK:
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case PR_GET_TIMING:
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return syserror(tcp) ? 0 : RVAL_UDECIMAL;
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case PR_GET_CHILD_SUBREAPER:
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case PR_GET_ENDIAN:
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case PR_GET_FPEMU:
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case PR_GET_FPEXC:
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tprints(", ");
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printnum_int(tcp, tcp->u_arg[1], "%u");
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break;
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case PR_GET_NAME:
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tprints(", ");
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if (!tcp->u_arg[1])
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tprints("NULL");
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else if (syserror(tcp))
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tprintf("%#lx", tcp->u_arg[1]);
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else
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printstr(tcp, tcp->u_arg[1], -1);
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break;
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case PR_GET_PDEATHSIG:
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tprints(", ");
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if (!tcp->u_arg[1])
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tprints("NULL");
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else if (syserror(tcp) || umove(tcp, tcp->u_arg[1], &i) < 0)
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tprintf("%#lx", tcp->u_arg[1]);
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else {
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tprints("[");
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tprints(signame(i));
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tprints("]");
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}
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break;
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case PR_GET_SECUREBITS:
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if (syserror(tcp) || tcp->u_rval == 0)
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return 0;
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tcp->auxstr = sprintflags("", secbits, tcp->u_rval);
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return RVAL_STR;
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case PR_GET_TID_ADDRESS:
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tprints(", ");
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printnum_long(tcp, tcp->u_arg[1], "%#lx");
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break;
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case PR_GET_TSC:
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tprints(", ");
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if (!tcp->u_arg[1])
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tprints("NULL");
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else if (syserror(tcp) || umove(tcp, tcp->u_arg[1], &i) < 0)
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tprintf("%#lx", tcp->u_arg[1]);
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else {
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tprints("[");
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printxval(pr_tsc, i, "PR_TSC_???");
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tprints("]");
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}
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break;
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case PR_GET_UNALIGN:
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tprints(", ");
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if (!tcp->u_arg[1])
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tprints("NULL");
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else if (syserror(tcp) || umove(tcp, tcp->u_arg[1], &i) < 0)
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tprintf("%#lx", tcp->u_arg[1]);
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else {
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tprints("[");
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printflags(pr_unalign_flags, i, "PR_UNALIGN_???");
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tprints("]");
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}
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break;
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case PR_MCE_KILL_GET:
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if (syserror(tcp))
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return 0;
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tcp->auxstr = xlookup(pr_mce_kill_policy, tcp->u_rval);
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return tcp->auxstr ? RVAL_STR : RVAL_UDECIMAL;
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default:
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break;
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}
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return 0;
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}
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SYS_FUNC(prctl)
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{
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return entering(tcp) ? prctl_enter(tcp) : prctl_exit(tcp);
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}
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#if defined X86_64 || defined X32
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# include <asm/prctl.h>
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# include "xlat/archvals.h"
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SYS_FUNC(arch_prctl)
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{
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if (entering(tcp))
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printxval(archvals, tcp->u_arg[0], "ARCH_???");
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switch (tcp->u_arg[0]) {
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case ARCH_GET_GS:
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case ARCH_GET_FS:
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if (exiting(tcp)) {
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tprints(", ");
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printnum_long(tcp, tcp->u_arg[1], "%#lx");
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}
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return 0;
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default:
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if (exiting(tcp))
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return 0;
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}
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tprintf(", %#lx", tcp->u_arg[1]);
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return 0;
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}
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#endif /* X86_64 || X32 */
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