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/userspace-api/no_new_privs.rst 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 /* Per task speculation control */ 211 #define PR_GET_SPECULATION_CTRL 52 212 #define PR_SET_SPECULATION_CTRL 53 213 /* Speculation control variants */ 214 # define PR_SPEC_STORE_BYPASS 0 215 # define PR_SPEC_INDIRECT_BRANCH 1 216 /* Return and control values for PR_SET/GET_SPECULATION_CTRL */ 217 # define PR_SPEC_NOT_AFFECTED 0 218 # define PR_SPEC_PRCTL (1UL << 0) 219 # define PR_SPEC_ENABLE (1UL << 1) 220 # define PR_SPEC_DISABLE (1UL << 2) 221 # define PR_SPEC_FORCE_DISABLE (1UL << 3) 222 223 #endif /* _LINUX_PRCTL_H */ 224