cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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prctl.c (2483B)

      1// SPDX-License-Identifier: LGPL-2.1
      2/*
      3 * trace/beauty/prctl.c
      4 *
      5 *  Copyright (C) 2017, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
      6 */
      7
      8#include "trace/beauty/beauty.h"
      9#include <linux/kernel.h>
     10#include <uapi/linux/prctl.h>
     11
     12#include "trace/beauty/generated/prctl_option_array.c"
     13
     14DEFINE_STRARRAY(prctl_options, "PR_");
     15
     16static size_t prctl__scnprintf_option(int option, char *bf, size_t size, bool show_prefix)
     17{
     18	return strarray__scnprintf(&strarray__prctl_options, bf, size, "%d", show_prefix, option);
     19}
     20
     21static size_t prctl__scnprintf_set_mm(int option, char *bf, size_t size, bool show_prefix)
     22{
     23	static DEFINE_STRARRAY(prctl_set_mm_options, "PR_SET_MM_");
     24	return strarray__scnprintf(&strarray__prctl_set_mm_options, bf, size, "%d", show_prefix, option);
     25}
     26
     27size_t syscall_arg__scnprintf_prctl_arg2(char *bf, size_t size, struct syscall_arg *arg)
     28{
     29	int option = syscall_arg__val(arg, 0);
     30
     31	if (option == PR_SET_MM)
     32		return prctl__scnprintf_set_mm(arg->val, bf, size, arg->show_string_prefix);
     33	/*
     34	 * We still don't grab the contents of pointers on entry or exit,
     35	 * so just print them as hex numbers
     36	 */
     37	if (option == PR_SET_NAME)
     38		return syscall_arg__scnprintf_hex(bf, size, arg);
     39
     40	return syscall_arg__scnprintf_long(bf, size, arg);
     41}
     42
     43size_t syscall_arg__scnprintf_prctl_arg3(char *bf, size_t size, struct syscall_arg *arg)
     44{
     45	int option = syscall_arg__val(arg, 0);
     46
     47	if (option == PR_SET_MM)
     48		return syscall_arg__scnprintf_hex(bf, size, arg);
     49
     50	return syscall_arg__scnprintf_long(bf, size, arg);
     51}
     52
     53size_t syscall_arg__scnprintf_prctl_option(char *bf, size_t size, struct syscall_arg *arg)
     54{
     55	unsigned long option = arg->val;
     56	enum {
     57                SPO_ARG2 = (1 << 1),
     58                SPO_ARG3 = (1 << 2),
     59                SPO_ARG4 = (1 << 3),
     60                SPO_ARG5 = (1 << 4),
     61                SPO_ARG6 = (1 << 5),
     62        };
     63	const u8 all_but2 = SPO_ARG3 | SPO_ARG4 | SPO_ARG5 | SPO_ARG6;
     64	const u8 all = SPO_ARG2 | all_but2;
     65	const u8 masks[] = {
     66		[PR_GET_DUMPABLE]	 = all,
     67		[PR_SET_DUMPABLE]	 = all_but2,
     68		[PR_SET_NAME]		 = all_but2,
     69		[PR_GET_CHILD_SUBREAPER] = all_but2,
     70		[PR_SET_CHILD_SUBREAPER] = all_but2,
     71		[PR_GET_SECUREBITS]	 = all,
     72		[PR_SET_SECUREBITS]	 = all_but2,
     73		[PR_SET_MM]		 = SPO_ARG4 | SPO_ARG5 | SPO_ARG6,
     74		[PR_GET_PDEATHSIG]	 = all,
     75		[PR_SET_PDEATHSIG]	 = all_but2,
     76	};
     77
     78	if (option < ARRAY_SIZE(masks))
     79		arg->mask |= masks[option];
     80
     81	return prctl__scnprintf_option(option, bf, size, arg->show_string_prefix);
     82}