wireguard-linux/arch/xtensa/kernel/ptrace.c, branch jd/unified-crypt-queue

xtensa: fix system_call interaction with ptrace

2019-11-29T23:47:54Z

Don't overwrite return value if system call was cancelled at entry by ptrace. Return status code from do_syscall_trace_enter so that pt_regs::syscall doesn't need to be changed to skip syscall. Signed-off-by: Max Filippov

xtensa: implement syscall tracepoints

2018-12-17T21:50:25Z

Add TIF_SYSCALL_TRACEPOINT flag definition; add _TIF_SYSCALL_TRACEPOINT to _TIF_WORK_MASK. Call trace_sys_enter from do_syscall_trace_enter and trace_sys_exit from do_syscall_trace_leave when TIF_SYSCALL_TRACEPOINT flag is set. Add declaration of sys_call_table to arch/xtensa/include/asm/syscall.h Add definition of NR_syscalls to arch/xtensa/include/asm/unistd.h Select HAVE_SYSCALL_TRACEPOINTS. This change allows tracing each syscall entry and exit through the ftrace mechanism. Signed-off-by: Max Filippov

xtensa: implement TIE regset

2018-12-17T21:48:22Z

Put all coprocessors and non-coprocessor TIE state into the REGSET_TIE. Mark TIE regset with NT_PRFPREG note type. Reimplement ptrace_getxregs and ptrace_setxregs using REGSET_TIE. Signed-off-by: Max Filippov

xtensa: implement task_user_regset_view

2018-12-17T21:48:21Z

- define struct user_pt_regs in the arch/xtensa/include/uapi/asm/ptrace.h with the same layout as xtensa_gregset_t; make xtensa_gregset_t a typedef; - define REGSET_GPR regset, implement register get and set functions; - define task_user_regset_view function and expose REGSET_GPR. Signed-off-by: Max Filippov

xtensa: call do_syscall_trace_{enter,leave} selectively

2018-12-17T21:48:21Z

Check whether calls to do_syscall_trace_{enter,leave} are necessary in the system_call function. Define _TIF_WORK_MASK to a bitmask of flags that reuire the calls. Fix comment. Signed-off-by: Max Filippov

xtensa: use NO_SYSCALL instead of -1

2018-12-17T21:48:21Z

For the sake of clarity define macro NO_SYSCALL and use it for setting/checking struct pt_regs::syscall field. Signed-off-by: Max Filippov

xtensa: drop custom PTRACE_{PEEK,POKE}{TEXT,DATA}

2018-12-03T09:39:23Z

Custom implementations of these ptrace calls are the same as generic implementations. Drop custom code and use generic. Signed-off-by: Max Filippov

xtensa: fix coprocessor part of ptrace_{get,set}xregs

2018-11-27T02:37:51Z

Layout of coprocessor registers in the elf_xtregs_t and xtregs_coprocessor_t may be different due to alignment. Thus it is not always possible to copy data between the xtregs_coprocessor_t structure and the elf_xtregs_t and get correct values for all registers. Use a table of offsets and sizes of individual coprocessor register groups to do coprocessor context copying in the ptrace_getxregs and ptrace_setxregs. This fixes incorrect coprocessor register values reading from the user process by the native gdb on an xtensa core with multiple coprocessors and registers with high alignment requirements. Cc: stable@vger.kernel.org Signed-off-by: Max Filippov

signal/ptrace: Add force_sig_ptrace_errno_trap and use it where needed

2018-01-23T01:07:11Z

There are so many places that build struct siginfo by hand that at least one of them is bound to get it wrong. A handful of cases in the kernel arguably did just that when using the errno field of siginfo to pass no errno values to userspace. The usage is limited to a single si_code so at least does not mess up anything else. Encapsulate this questionable pattern in a helper function so that the userspace ABI is preserved. Update all of the places that use this pattern to use the new helper function. Signed-off-by: "Eric W. Biederman"

xtensa: use generic tracehooks

2017-05-01T14:00:10Z

Use tracehook_report_syscall_{entry,exit} instead of a local copy of it in do_syscall_trace. Allow tracehook to cancel syscall by returning invalid syscall number to the system_call function. Signed-off-by: Max Filippov