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|
/*
* Copyright (c) 2022 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef SUDO_EXEC_PTRACE_H
#define SUDO_EXEC_PTRACE_H
#include <sys/prctl.h>
#include <sys/ptrace.h>
#include <sys/user.h>
#include <asm/unistd.h>
#include <linux/audit.h>
#include <linux/ptrace.h>
#include <linux/seccomp.h>
#include <linux/filter.h>
/* Older kernel headers may be missing some EM_* defines in linux/elf.h. */
#include <elf.h>
/* Older systems may not support execveat(2). */
#ifndef __NR_execveat
# define __NR_execveat -1
#endif
/* In case userland elf.h doesn't define NT_ARM_SYSTEM_CALL. */
#if defined(__aarch64__) && !defined(NT_ARM_SYSTEM_CALL)
# define NT_ARM_SYSTEM_CALL 0x404
#endif
/* In case userland doesn't define __X32_SYSCALL_BIT. */
#if defined(__x86_64__) && !defined(__X32_SYSCALL_BIT)
# define __X32_SYSCALL_BIT 0x40000000
#endif
#ifdef __mips__
# ifndef __NR_O32_Linux
# define __NR_O32_Linux 4000
# endif
# ifndef __NR_N32_Linux
# define __NR_N32_Linux 6000
# endif
#endif
/* Align address to a (compat) word boundary. */
#define WORDALIGN(_a, _r) \
(((_a) + ((long)(_r).wordsize - 1L)) & ~((long)(_r).wordsize - 1L))
/* Align pointer to a native word boundary. */
#define LONGALIGN(_p) \
(((unsigned long)(_p) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
/*
* See syscall(2) for a list of registers used in system calls.
* For example code, see tools/testing/selftests/seccomp/seccomp_bpf.c
*
* The structs and registers vary among the different platforms.
* We define user_regs_struct as the struct to use for gettings
* and setting the general registers and define accessor
* macros to get/set the individual struct members.
*
* The value of SECCOMP_AUDIT_ARCH is used when matching the architecture
* in the seccomp(2) filter.
*/
#if defined(__x86_64__)
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_X86_64
# ifndef __ILP32__
# define X32_execve __X32_SYSCALL_BIT + 520
# define X32_execveat __X32_SYSCALL_BIT + 545
# endif
# define sudo_pt_regs struct user_regs_struct
# define reg_syscall(x) (x).orig_rax
# define reg_retval(x) (x).rax
# define reg_sp(x) (x).rsp
# define reg_arg1(x) (x).rdi
# define reg_arg2(x) (x).rsi
# define reg_arg3(x) (x).rdx
# define reg_arg4(x) (x).r10
#elif defined(__aarch64__)
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_AARCH64
# define sudo_pt_regs struct user_pt_regs
# define reg_syscall(x) (x).regs[8] /* w8 */
# define reg_retval(x) (x).regs[0] /* x0 */
# define reg_sp(x) (x).sp /* sp */
# define reg_arg1(x) (x).regs[0] /* x0 */
# define reg_arg2(x) (x).regs[1] /* x1 */
# define reg_arg3(x) (x).regs[2] /* x2 */
# define reg_arg4(x) (x).regs[3] /* x3 */
# define reg_set_syscall(_r, _nr) do { \
struct iovec _iov; \
long _syscallno = (_nr); \
_iov.iov_base = &_syscallno; \
_iov.iov_len = sizeof(_syscallno); \
ptrace(PTRACE_SETREGSET, pid, NT_ARM_SYSTEM_CALL, &_iov); \
} while (0)
#elif defined(__arm__)
/* Note: assumes arm EABI, not OABI */
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARM
# define sudo_pt_regs struct pt_regs
# define reg_syscall(x) (x).ARM_r7
# define reg_retval(x) (x).ARM_r0
# define reg_sp(x) (x).ARM_sp
# define reg_arg1(x) (x).ARM_r0
# define reg_arg2(x) (x).ARM_r1
# define reg_arg3(x) (x).ARM_r2
# define reg_arg4(x) (x).ARM_r3
# define reg_set_syscall(_r, _nr) do { \
ptrace(PTRACE_SET_SYSCALL, pid, NULL, _nr); \
} while (0)
#elif defined (__hppa__)
/* Untested (should also support hppa64) */
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC
# define sudo_pt_regs struct user_regs_struct
# define reg_syscall(x) (x).gr[20] /* r20 */
# define reg_retval(x) (x).gr[28] /* r28 */
# define reg_sp(x) (x).gr[30] /* r30 */
# define reg_arg1(x) (x).gr[26] /* r26 */
# define reg_arg2(x) (x).gr[25] /* r25 */
# define reg_arg3(x) (x).gr[24] /* r24 */
# define reg_arg4(x) (x).gr[23] /* r23 */
#elif defined(__i386__)
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_I386
# define sudo_pt_regs struct user_regs_struct
# define reg_syscall(x) (x).orig_eax
# define reg_retval(x) (x).eax
# define reg_sp(x) (x).esp
# define reg_arg1(x) (x).ebx
# define reg_arg2(x) (x).ecx
# define reg_arg3(x) (x).edx
# define reg_arg4(x) (x).esi
#elif defined(__mips__)
# if _MIPS_SIM == _MIPS_SIM_ABI32
# /* Linux o32 style syscalls, 4000-4999. */
# if BYTE_ORDER == LITTLE_ENDIAN
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL
# else
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS
# endif
# elif _MIPS_SIM == _MIPS_SIM_ABI64
# /* Linux 64-bit syscalls, 5000-5999. */
# if BYTE_ORDER == LITTLE_ENDIAN
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL64
# else
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS64
# endif
# elif _MIPS_SIM == _MIPS_SIM_NABI32
# /* Linux N32 syscalls, 6000-6999. */
# if BYTE_ORDER == LITTLE_ENDIAN
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL64N32
# else
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS64N32
# endif
# else
# error "Unsupported MIPS ABI"
# endif
/*
* If called via syscall(__NR_###), v0 holds __NR_O32_Linux and the real
* syscall is in the first arg (a0). The actual args are shifted by one.
* MIPS does not support setting the syscall return value via ptrace.
*/
# define sudo_pt_regs struct pt_regs
# define reg_syscall(_r) ({ \
__u64 _nr; \
if ((_r).regs[2] == __NR_O32_Linux) \
_nr = (_r).regs[4]; /* a0 */ \
else \
_nr = (_r).regs[2]; /* v0 */ \
_nr; \
})
# define reg_retval(x) (x).regs[2] /* v0 */
# define reg_sp(x) (x).regs[29] /* sp */
# define reg_arg1(x) \
((x).regs[2] == __NR_O32_Linux ? (x).regs[5] : (x).regs[4])
# define reg_set_arg1(_r, _v) do { \
if ((_r).regs[2] == __NR_O32_Linux) \
(_r).regs[5] = _v; /* a1 */ \
else \
(_r).regs[4] = _v; /* a0 */ \
} while (0)
# define reg_arg2(x) \
((x).regs[2] == __NR_O32_Linux ? (x).regs[6] : (x).regs[5])
# define reg_set_arg2(_r, _v) do { \
if ((_r).regs[2] == __NR_O32_Linux) \
(_r).regs[6] = _v; /* a2 */ \
else \
(_r).regs[5] = _v; /* a1 */ \
} while (0)
# define reg_arg3(x) \
((x).regs[2] == __NR_O32_Linux ? (x).regs[7] : (x).regs[6])
# define reg_set_arg3(_r, _v) do { \
if ((_r).regs[2] == __NR_O32_Linux) \
(_r).regs[7] = _v; /* a3 */ \
else \
(_r).regs[6] = _v; /* a2 */ \
} while (0)
/* XXX - reg_arg4 probably wrong for syscall() type calls on 032. */
# define reg_arg4(x) \
((x).regs[2] == __NR_O32_Linux ? (x).regs[8] : (x).regs[7])
# define reg_set_arg4(_r, _v) do { \
if ((_r).regs[2] == __NR_O32_Linux) \
(_r).regs[8] = _v; /* a4 */ \
else \
(_r).regs[7] = _v; /* a3 */ \
} while (0)
# define reg_set_syscall(_r, _nr) do { \
if ((_r).regs[2] == __NR_O32_Linux) \
(_r).regs[4] = _nr; /* a0 */ \
else \
(_r).regs[2] = _nr; /* v0 */ \
} while (0)
#elif defined(__powerpc__)
# if defined(__powerpc64__)
# if BYTE_ORDER == LITTLE_ENDIAN
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64LE
# else
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64
# endif
# else
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC
# endif
# define sudo_pt_regs struct pt_regs
# define reg_syscall(x) (x).gpr[0] /* r0 */
# define reg_retval(x) (x).gpr[3] /* r3 */
# define reg_sp(x) (x).gpr[1] /* r1 */
# define reg_arg1(x) (x).orig_gpr3 /* r3 */
# define reg_arg2(x) (x).gpr[4] /* r4 */
# define reg_arg3(x) (x).gpr[5] /* r5 */
# define reg_arg4(x) (x).gpr[6] /* r6 */
# define reg_set_retval(_r, _v) do { \
if (((_r).trap & 0xfff0) == 0x3000) { \
/* scv 0 system call, uses negative error code for result. */ \
reg_retval(_r) = (_v); \
} else { \
/* \
* Set CR0 SO bit to indicate a syscall error, which is stored \
* as a positive error code. \
*/ \
reg_retval(_r) = -(_v); \
(_r).ccr |= 0x10000000; \
} \
} while (0)
#elif defined(__riscv) && __riscv_xlen == 64
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV64
# define sudo_pt_regs struct user_regs_struct
# define reg_syscall(x) (x).a7
# define reg_retval(x) (x).a0
# define reg_sp(x) (x).sp
# define reg_arg1(x) (x).a0
# define reg_arg2(x) (x).a1
# define reg_arg3(x) (x).a2
# define reg_arg4(x) (x).a3
#elif defined(__s390__)
/*
* Both the syscall number and return value are stored in r2 for
* the s390 ptrace API. The first argument is stored in orig_gpr2.
*/
# if defined(__s390x__)
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390X
# else
# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390
# endif
# define sudo_pt_regs s390_regs
# define reg_syscall(x) (x).gprs[2] /* r2 */
# define reg_retval(x) (x).gprs[2] /* r2 */
# define reg_sp(x) (x).gprs[15] /* r15 */
# define reg_arg1(x) (x).orig_gpr2 /* r2 */
# define reg_arg2(x) (x).gprs[3] /* r3 */
# define reg_arg3(x) (x).gprs[4] /* r4 */
# define reg_arg4(x) (x).gprs[5] /* r6 */
#else
# error "Do not know how to find your architecture's registers"
#endif
/*
* Compat definitions for running 32-bit binaries on 64-bit platforms.
* We must define the register struct too since there is no way to
* get it directly from the system headers.
*
* The value of SECCOMP_AUDIT_ARCH_COMPAT is used when matching the
* architecture in the seccomp(2) filter. We can tell when the compat
* arch matched by inspecting the message returned by PTRACE_GETEVENTMSG.
*/
#if defined(__x86_64__)
struct i386_user_regs_struct {
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
unsigned int esi;
unsigned int edi;
unsigned int ebp;
unsigned int eax;
unsigned int xds;
unsigned int xes;
unsigned int xfs;
unsigned int xgs;
unsigned int orig_eax;
unsigned int eip;
unsigned int xcs;
unsigned int eflags;
unsigned int esp;
unsigned int xss;
};
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_I386
# define COMPAT_execve 11
# define COMPAT_execveat 358
# define compat_sudo_pt_regs struct i386_user_regs_struct
# define compat_reg_syscall(x) (x).orig_eax
# define compat_reg_retval(x) (x).eax
# define compat_reg_sp(x) (x).esp
# define compat_reg_arg1(x) (x).ebx
# define compat_reg_arg2(x) (x).ecx
# define compat_reg_arg3(x) (x).edx
# define compat_reg_arg4(x) (x).esi
#elif defined(__aarch64__)
struct arm_pt_regs {
unsigned int uregs[18];
};
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_ARM
# define COMPAT_execve 11
# define COMPAT_execveat 387
# define compat_sudo_pt_regs struct arm_pt_regs
# define compat_reg_syscall(x) (x).uregs[7] /* r7 */
# define compat_reg_retval(x) (x).uregs[0] /* r0 */
# define compat_reg_sp(x) (x).uregs[13] /* r13 */
# define compat_reg_arg1(x) (x).uregs[0] /* r0 */
# define compat_reg_arg2(x) (x).uregs[1] /* r1 */
# define compat_reg_arg3(x) (x).uregs[2] /* r2 */
# define compat_reg_arg4(x) (x).uregs[3] /* r3 */
# define compat_reg_set_syscall(_r, _nr) reg_set_syscall(_r, _nr)
#elif defined(__mips__)
# if _MIPS_SIM == _MIPS_SIM_ABI64
/* MIPS o32/n32 binary compatibility on a mips64 system. */
# if BYTE_ORDER == LITTLE_ENDIAN
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_MIPSEL
# define SECCOMP_AUDIT_ARCH_COMPAT2 AUDIT_ARCH_MIPSEL64N32
# else
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_MIPS
# define SECCOMP_AUDIT_ARCH_COMPAT2 AUDIT_ARCH_MIPS64N32
# endif
# define COMPAT_execve __NR_O32_Linux + 11
# define COMPAT_execveat __NR_O32_Linux + 356
# define COMPAT2_execve __NR_N32_Linux + 57
# define COMPAT2_execveat __NR_N32_Linux + 320
# elif _MIPS_SIM == _MIPS_SIM_NABI32
# if BYTE_ORDER == LITTLE_ENDIAN
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_MIPSEL
# else
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_MIPS
# endif
# define COMPAT_execve __NR_O32_Linux + 11
# define COMPAT_execveat __NR_O32_Linux + 356
# endif /* _MIPS_SIM_ABI64 */
/* MIPS ABIs use a common ptrace interface. */
# define compat_sudo_pt_regs struct pt_regs
# define compat_reg_syscall(x) reg_syscall(x)
# define compat_reg_retval(x) reg_retval(x)
# define compat_reg_sp(x) reg_sp(x)
# define compat_reg_arg1(x) reg_arg1(x)
# define compat_reg_set_arg1(_r, _v) reg_set_arg1(_r, _v)
# define compat_reg_arg2(x) reg_arg2(x)
# define compat_reg_set_arg2(_r, _v) reg_set_arg2(_r, _v)
# define compat_reg_arg3(x) reg_arg3(x)
# define compat_reg_set_arg3(_r, _v) reg_set_arg3(_r, _v)
# define compat_reg_arg4(x) reg_arg4(x)
# define compat_reg_set_arg4(_r, _v) reg_set_arg4(_r, _v)
# define compat_reg_set_syscall(_r, _nr) reg_set_syscall(_r, _nr)
#elif defined(__powerpc64__)
struct ppc_pt_regs {
unsigned int gpr[32];
unsigned int nip;
unsigned int msr;
unsigned int orig_gpr3;
unsigned int ctr;
unsigned int link;
unsigned int xer;
unsigned int ccr;
unsigned int mq;
unsigned int trap;
unsigned int dar;
unsigned int dsisr;
unsigned int result;
};
# if BYTE_ORDER == LITTLE_ENDIAN
/* There is no AUDIT_ARCH_PPCLE define. */
# define SECCOMP_AUDIT_ARCH_COMPAT (AUDIT_ARCH_PPC|__AUDIT_ARCH_LE)
# else
# define SECCOMP_AUDIT_ARCH_COMPAT AUDIT_ARCH_PPC
# endif
# define COMPAT_execve __NR_execve
# define COMPAT_execveat __NR_execveat
# define compat_sudo_pt_regs struct ppc_pt_regs
# define compat_reg_syscall(x) (x).gpr[0] /* r0 */
# define compat_reg_retval(x) (x).gpr[3] /* r3 */
# define compat_reg_sp(x) (x).gpr[1] /* r1 */
# define compat_reg_arg1(x) (x).orig_gpr3 /* r3 */
# define compat_reg_arg2(x) (x).gpr[4] /* r4 */
# define compat_reg_arg3(x) (x).gpr[5] /* r5 */
# define compat_reg_arg4(x) (x).gpr[6] /* r6 */
# define compat_reg_set_retval(_r, _v) reg_set_retval(_r, _v)
#endif
/* Set the syscall number the "normal" way by default. */
#ifndef reg_set_syscall
# define reg_set_syscall(_r, _nr) do { \
reg_syscall(_r) = (_nr); \
} while (0)
#endif
#ifndef compat_reg_set_syscall
# define compat_reg_set_syscall(_r, _nr) do { \
compat_reg_syscall(_r) = (_nr); \
} while (0)
#endif
/* Set the syscall return value the "normal" way by default. */
#ifndef reg_set_retval
# define reg_set_retval(_r, _v) do { \
reg_retval(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_retval
# define compat_reg_set_retval(_r, _v) do { \
compat_reg_retval(_r) = (_v); \
} while (0)
#endif
/* Set the syscall arguments the "normal" way by default. */
#ifndef reg_set_arg1
# define reg_set_arg1(_r, _v) do { \
reg_arg1(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg1
# define compat_reg_set_arg1(_r, _v) do { \
compat_reg_arg1(_r) = (_v); \
} while (0)
#endif
#ifndef reg_set_arg2
# define reg_set_arg2(_r, _v) do { \
reg_arg2(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg2
# define compat_reg_set_arg2(_r, _v) do { \
compat_reg_arg2(_r) = (_v); \
} while (0)
#endif
#ifndef reg_set_arg3
# define reg_set_arg3(_r, _v) do { \
reg_arg3(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg3
# define compat_reg_set_arg3(_r, _v) do { \
compat_reg_arg3(_r) = (_v); \
} while (0)
#endif
#ifndef reg_set_arg4
# define reg_set_arg4(_r, _v) do { \
reg_arg4(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg4
# define compat_reg_set_arg4(_r, _v) do { \
compat_reg_arg4(_r) = (_v); \
} while (0)
#endif
/* Set the syscall arguments the "normal" way by default. */
#ifndef reg_set_arg1
# define reg_set_arg1(_r, _v) do { \
reg_arg1(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg1
# define compat_reg_set_arg1(_r, _v) do { \
compat_reg_arg1(_r) = (_v); \
} while (0)
#endif
#ifndef reg_set_arg2
# define reg_set_arg2(_r, _v) do { \
reg_arg2(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg2
# define compat_reg_set_arg2(_r, _v) do { \
compat_reg_arg2(_r) = (_v); \
} while (0)
#endif
#ifndef reg_set_arg3
# define reg_set_arg3(_r, _v) do { \
reg_arg3(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg3
# define compat_reg_set_arg3(_r, _v) do { \
compat_reg_arg3(_r) = (_v); \
} while (0)
#endif
#ifndef reg_set_arg4
# define reg_set_arg4(_r, _v) do { \
reg_arg4(_r) = (_v); \
} while (0)
#endif
#ifndef compat_reg_set_arg4
# define compat_reg_set_arg4(_r, _v) do { \
compat_reg_arg4(_r) = (_v); \
} while (0)
#endif
struct sudo_ptrace_regs {
union {
sudo_pt_regs native;
#ifdef SECCOMP_AUDIT_ARCH_COMPAT
compat_sudo_pt_regs compat;
#endif
} u;
unsigned int wordsize;
bool compat;
};
#endif /* SUDO_EXEC_PTRACE_H */
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