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336d4b814b
Today ptrace_message is easy to overlook as it not a core part of ptrace_stop. It has been overlooked so much that there are places that set ptrace_message and don't clear it, and places that never set it. So if you get an unlucky sequence of events the ptracer may be able to read a ptrace_message that does not apply to the current ptrace stop. Move setting of ptrace_message into ptrace_stop so that it always gets set before the stop, and always gets cleared after the stop. This prevents non-sense from being reported to userspace and makes ptrace_message more visible in the ptrace helper functions so that kernel developers can see it. Link: https://lkml.kernel.org/r/87bky67qfv.fsf_-_@email.froward.int.ebiederm.org Acked-by: Oleg Nesterov <oleg@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
156 lines
4.3 KiB
C
156 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_PTRACE_H
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#define _UAPI_LINUX_PTRACE_H
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/* ptrace.h */
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/* structs and defines to help the user use the ptrace system call. */
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/* has the defines to get at the registers. */
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#include <linux/types.h>
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#define PTRACE_TRACEME 0
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#define PTRACE_PEEKTEXT 1
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#define PTRACE_PEEKDATA 2
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#define PTRACE_PEEKUSR 3
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#define PTRACE_POKETEXT 4
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#define PTRACE_POKEDATA 5
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#define PTRACE_POKEUSR 6
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#define PTRACE_CONT 7
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#define PTRACE_KILL 8
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#define PTRACE_SINGLESTEP 9
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#define PTRACE_ATTACH 16
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#define PTRACE_DETACH 17
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#define PTRACE_SYSCALL 24
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/* 0x4200-0x4300 are reserved for architecture-independent additions. */
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#define PTRACE_SETOPTIONS 0x4200
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#define PTRACE_GETEVENTMSG 0x4201
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#define PTRACE_GETSIGINFO 0x4202
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#define PTRACE_SETSIGINFO 0x4203
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/*
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* Generic ptrace interface that exports the architecture specific regsets
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* using the corresponding NT_* types (which are also used in the core dump).
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* Please note that the NT_PRSTATUS note type in a core dump contains a full
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* 'struct elf_prstatus'. But the user_regset for NT_PRSTATUS contains just the
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* elf_gregset_t that is the pr_reg field of 'struct elf_prstatus'. For all the
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* other user_regset flavors, the user_regset layout and the ELF core dump note
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* payload are exactly the same layout.
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*
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* This interface usage is as follows:
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* struct iovec iov = { buf, len};
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*
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* ret = ptrace(PTRACE_GETREGSET/PTRACE_SETREGSET, pid, NT_XXX_TYPE, &iov);
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*
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* On the successful completion, iov.len will be updated by the kernel,
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* specifying how much the kernel has written/read to/from the user's iov.buf.
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*/
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#define PTRACE_GETREGSET 0x4204
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#define PTRACE_SETREGSET 0x4205
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#define PTRACE_SEIZE 0x4206
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#define PTRACE_INTERRUPT 0x4207
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#define PTRACE_LISTEN 0x4208
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#define PTRACE_PEEKSIGINFO 0x4209
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struct ptrace_peeksiginfo_args {
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__u64 off; /* from which siginfo to start */
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__u32 flags;
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__s32 nr; /* how may siginfos to take */
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};
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#define PTRACE_GETSIGMASK 0x420a
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#define PTRACE_SETSIGMASK 0x420b
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#define PTRACE_SECCOMP_GET_FILTER 0x420c
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#define PTRACE_SECCOMP_GET_METADATA 0x420d
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struct seccomp_metadata {
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__u64 filter_off; /* Input: which filter */
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__u64 flags; /* Output: filter's flags */
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};
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#define PTRACE_GET_SYSCALL_INFO 0x420e
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#define PTRACE_SYSCALL_INFO_NONE 0
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#define PTRACE_SYSCALL_INFO_ENTRY 1
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#define PTRACE_SYSCALL_INFO_EXIT 2
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#define PTRACE_SYSCALL_INFO_SECCOMP 3
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struct ptrace_syscall_info {
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__u8 op; /* PTRACE_SYSCALL_INFO_* */
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__u8 pad[3];
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__u32 arch;
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__u64 instruction_pointer;
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__u64 stack_pointer;
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union {
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struct {
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__u64 nr;
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__u64 args[6];
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} entry;
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struct {
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__s64 rval;
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__u8 is_error;
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} exit;
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struct {
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__u64 nr;
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__u64 args[6];
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__u32 ret_data;
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} seccomp;
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};
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};
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#define PTRACE_GET_RSEQ_CONFIGURATION 0x420f
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struct ptrace_rseq_configuration {
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__u64 rseq_abi_pointer;
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__u32 rseq_abi_size;
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__u32 signature;
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__u32 flags;
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__u32 pad;
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};
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/*
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* These values are stored in task->ptrace_message
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* by ptrace_stop to describe the current syscall-stop.
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*/
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#define PTRACE_EVENTMSG_SYSCALL_ENTRY 1
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#define PTRACE_EVENTMSG_SYSCALL_EXIT 2
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/* Read signals from a shared (process wide) queue */
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#define PTRACE_PEEKSIGINFO_SHARED (1 << 0)
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/* Wait extended result codes for the above trace options. */
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#define PTRACE_EVENT_FORK 1
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#define PTRACE_EVENT_VFORK 2
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#define PTRACE_EVENT_CLONE 3
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#define PTRACE_EVENT_EXEC 4
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#define PTRACE_EVENT_VFORK_DONE 5
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#define PTRACE_EVENT_EXIT 6
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#define PTRACE_EVENT_SECCOMP 7
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/* Extended result codes which enabled by means other than options. */
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#define PTRACE_EVENT_STOP 128
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/* Options set using PTRACE_SETOPTIONS or using PTRACE_SEIZE @data param */
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#define PTRACE_O_TRACESYSGOOD 1
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#define PTRACE_O_TRACEFORK (1 << PTRACE_EVENT_FORK)
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#define PTRACE_O_TRACEVFORK (1 << PTRACE_EVENT_VFORK)
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#define PTRACE_O_TRACECLONE (1 << PTRACE_EVENT_CLONE)
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#define PTRACE_O_TRACEEXEC (1 << PTRACE_EVENT_EXEC)
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#define PTRACE_O_TRACEVFORKDONE (1 << PTRACE_EVENT_VFORK_DONE)
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#define PTRACE_O_TRACEEXIT (1 << PTRACE_EVENT_EXIT)
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#define PTRACE_O_TRACESECCOMP (1 << PTRACE_EVENT_SECCOMP)
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/* eventless options */
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#define PTRACE_O_EXITKILL (1 << 20)
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#define PTRACE_O_SUSPEND_SECCOMP (1 << 21)
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#define PTRACE_O_MASK (\
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0x000000ff | PTRACE_O_EXITKILL | PTRACE_O_SUSPEND_SECCOMP)
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#include <asm/ptrace.h>
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#endif /* _UAPI_LINUX_PTRACE_H */
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