include/uapi/linux/prctl.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 #ifndef _LINUX_PRCTL_H
   3 #define _LINUX_PRCTL_H
   4
   5 #include <linux/types.h>
   6
   7 /* Values to pass as first argument to prctl() */
   8
   9 #define PR_SET_PDEATHSIG  1  /* Second arg is a signal */
  10 #define PR_GET_PDEATHSIG  2  /* Second arg is a ptr to return the signal */
  11
  12 /* Get/set current->mm->dumpable */
  13 #define PR_GET_DUMPABLE   3
  14 #define PR_SET_DUMPABLE   4
  15
  16 /* Get/set unaligned access control bits (if meaningful) */
  17 #define PR_GET_UNALIGN    5
  18 #define PR_SET_UNALIGN    6
  19 # define PR_UNALIGN_NOPRINT     1       /* silently fix up unaligned user accesses */
  20 # define PR_UNALIGN_SIGBUS      2       /* generate SIGBUS on unaligned user access */
  21
  22 /* Get/set whether or not to drop capabilities on setuid() away from
  23  * uid 0 (as per security/commoncap.c) */
  24 #define PR_GET_KEEPCAPS   7
  25 #define PR_SET_KEEPCAPS   8
  26
  27 /* Get/set floating-point emulation control bits (if meaningful) */
  28 #define PR_GET_FPEMU  9
  29 #define PR_SET_FPEMU 10
  30 # define PR_FPEMU_NOPRINT       1       /* silently emulate fp operations accesses */
  31 # define PR_FPEMU_SIGFPE        2       /* don't emulate fp operations, send SIGFPE instead */
  32
  33 /* Get/set floating-point exception mode (if meaningful) */
  34 #define PR_GET_FPEXC    11
  35 #define PR_SET_FPEXC    12
  36 # define PR_FP_EXC_SW_ENABLE    0x80    /* Use FPEXC for FP exception enables */
  37 # define PR_FP_EXC_DIV          0x010000        /* floating point divide by zero */
  38 # define PR_FP_EXC_OVF          0x020000        /* floating point overflow */
  39 # define PR_FP_EXC_UND          0x040000        /* floating point underflow */
  40 # define PR_FP_EXC_RES          0x080000        /* floating point inexact result */
  41 # define PR_FP_EXC_INV          0x100000        /* floating point invalid operation */
  42 # define PR_FP_EXC_DISABLED     0       /* FP exceptions disabled */
  43 # define PR_FP_EXC_NONRECOV     1       /* async non-recoverable exc. mode */
  44 # define PR_FP_EXC_ASYNC        2       /* async recoverable exception mode */
  45 # define PR_FP_EXC_PRECISE      3       /* precise exception mode */
  46
  47 /* Get/set whether we use statistical process timing or accurate timestamp
  48  * based process timing */
  49 #define PR_GET_TIMING   13
  50 #define PR_SET_TIMING   14
  51 # define PR_TIMING_STATISTICAL  0       /* Normal, traditional,
  52                                                    statistical process timing */
  53 # define PR_TIMING_TIMESTAMP    1       /* Accurate timestamp based
  54                                                    process timing */
  55
  56 #define PR_SET_NAME    15               /* Set process name */
  57 #define PR_GET_NAME    16               /* Get process name */
  58
  59 /* Get/set process endian */
  60 #define PR_GET_ENDIAN   19
  61 #define PR_SET_ENDIAN   20
  62 # define PR_ENDIAN_BIG          0
  63 # define PR_ENDIAN_LITTLE       1       /* True little endian mode */
  64 # define PR_ENDIAN_PPC_LITTLE   2       /* "PowerPC" pseudo little endian */
  65
  66 /* Get/set process seccomp mode */
  67 #define PR_GET_SECCOMP  21
  68 #define PR_SET_SECCOMP  22
  69
  70 /* Get/set the capability bounding set (as per security/commoncap.c) */
  71 #define PR_CAPBSET_READ 23
  72 #define PR_CAPBSET_DROP 24
  73
  74 /* Get/set the process' ability to use the timestamp counter instruction */
  75 #define PR_GET_TSC 25
  76 #define PR_SET_TSC 26
  77 # define PR_TSC_ENABLE          1       /* allow the use of the timestamp counter */
  78 # define PR_TSC_SIGSEGV         2       /* throw a SIGSEGV instead of reading the TSC */
  79
  80 /* Get/set securebits (as per security/commoncap.c) */
  81 #define PR_GET_SECUREBITS 27
  82 #define PR_SET_SECUREBITS 28
  83
  84 /*
  85  * Get/set the timerslack as used by poll/select/nanosleep
  86  * A value of 0 means "use default"
  87  */
  88 #define PR_SET_TIMERSLACK 29
  89 #define PR_GET_TIMERSLACK 30
  90
  91 #define PR_TASK_PERF_EVENTS_DISABLE             31
  92 #define PR_TASK_PERF_EVENTS_ENABLE              32
  93
  94 /*
  95  * Set early/late kill mode for hwpoison memory corruption.
  96  * This influences when the process gets killed on a memory corruption.
  97  */
  98 #define PR_MCE_KILL     33
  99 # define PR_MCE_KILL_CLEAR   0
 100 # define PR_MCE_KILL_SET     1
 101
 102 # define PR_MCE_KILL_LATE    0
 103 # define PR_MCE_KILL_EARLY   1
 104 # define PR_MCE_KILL_DEFAULT 2
 105
 106 #define PR_MCE_KILL_GET 34
 107
 108 /*
 109  * Tune up process memory map specifics.
 110  */
 111 #define PR_SET_MM               35
 112 # define PR_SET_MM_START_CODE           1
 113 # define PR_SET_MM_END_CODE             2
 114 # define PR_SET_MM_START_DATA           3
 115 # define PR_SET_MM_END_DATA             4
 116 # define PR_SET_MM_START_STACK          5
 117 # define PR_SET_MM_START_BRK            6
 118 # define PR_SET_MM_BRK                  7
 119 # define PR_SET_MM_ARG_START            8
 120 # define PR_SET_MM_ARG_END              9
 121 # define PR_SET_MM_ENV_START            10
 122 # define PR_SET_MM_ENV_END              11
 123 # define PR_SET_MM_AUXV                 12
 124 # define PR_SET_MM_EXE_FILE             13
 125 # define PR_SET_MM_MAP                  14
 126 # define PR_SET_MM_MAP_SIZE             15
 127
 128 /*
 129  * This structure provides new memory descriptor
 130  * map which mostly modifies /proc/pid/stat[m]
 131  * output for a task. This mostly done in a
 132  * sake of checkpoint/restore functionality.
 133  */
 134 struct prctl_mm_map {
 135         __u64   start_code;             /* code section bounds */
 136         __u64   end_code;
 137         __u64   start_data;             /* data section bounds */
 138         __u64   end_data;
 139         __u64   start_brk;              /* heap for brk() syscall */
 140         __u64   brk;
 141         __u64   start_stack;            /* stack starts at */
 142         __u64   arg_start;              /* command line arguments bounds */
 143         __u64   arg_end;
 144         __u64   env_start;              /* environment variables bounds */
 145         __u64   env_end;
 146         __u64   *auxv;                  /* auxiliary vector */
 147         __u32   auxv_size;              /* vector size */
 148         __u32   exe_fd;                 /* /proc/$pid/exe link file */
 149 };
 150
 151 /*
 152  * Set specific pid that is allowed to ptrace the current task.
 153  * A value of 0 mean "no process".
 154  */
 155 #define PR_SET_PTRACER 0x59616d61
 156 # define PR_SET_PTRACER_ANY ((unsigned long)-1)
 157
 158 #define PR_SET_CHILD_SUBREAPER  36
 159 #define PR_GET_CHILD_SUBREAPER  37
 160
 161 /*
 162  * If no_new_privs is set, then operations that grant new privileges (i.e.
 163  * execve) will either fail or not grant them.  This affects suid/sgid,
 164  * file capabilities, and LSMs.
 165  *
 166  * Operations that merely manipulate or drop existing privileges (setresuid,
 167  * capset, etc.) will still work.  Drop those privileges if you want them gone.
 168  *
 169  * Changing LSM security domain is considered a new privilege.  So, for example,
 170  * asking selinux for a specific new context (e.g. with runcon) will result
 171  * in execve returning -EPERM.
 172  *
 173  * See Documentation/prctl/no_new_privs.txt for more details.
 174  */
 175 #define PR_SET_NO_NEW_PRIVS     38
 176 #define PR_GET_NO_NEW_PRIVS     39
 177
 178 #define PR_GET_TID_ADDRESS      40
 179
 180 #define PR_SET_THP_DISABLE      41
 181 #define PR_GET_THP_DISABLE      42
 182
 183 /*
 184  * Tell the kernel to start/stop helping userspace manage bounds tables.
 185  */
 186 #define PR_MPX_ENABLE_MANAGEMENT  43
 187 #define PR_MPX_DISABLE_MANAGEMENT 44
 188
 189 #define PR_SET_FP_MODE          45
 190 #define PR_GET_FP_MODE          46
 191 # define PR_FP_MODE_FR          (1 << 0)        /* 64b FP registers */
 192 # define PR_FP_MODE_FRE         (1 << 1)        /* 32b compatibility */
 193
 194 /* Control the ambient capability set */
 195 #define PR_CAP_AMBIENT                  47
 196 # define PR_CAP_AMBIENT_IS_SET          1
 197 # define PR_CAP_AMBIENT_RAISE           2
 198 # define PR_CAP_AMBIENT_LOWER           3
 199 # define PR_CAP_AMBIENT_CLEAR_ALL       4
 200
 201 /* arm64 Scalable Vector Extension controls */
 202 /* Flag values must be kept in sync with ptrace NT_ARM_SVE interface */
 203 #define PR_SVE_SET_VL                   50      /* set task vector length */
 204 # define PR_SVE_SET_VL_ONEXEC           (1 << 18) /* defer effect until exec */
 205 #define PR_SVE_GET_VL                   51      /* get task vector length */
 206 /* Bits common to PR_SVE_SET_VL and PR_SVE_GET_VL */
 207 # define PR_SVE_VL_LEN_MASK             0xffff
 208 # define PR_SVE_VL_INHERIT              (1 << 17) /* inherit across exec */
 209
 210 #endif /* _LINUX_PRCTL_H */