linux-dev/arch/csky/kernel/traps.c, branch linus/master

Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-01-17T03:49:30Z

Pull signal/exit/ptrace updates from Eric Biederman: "This set of changes deletes some dead code, makes a lot of cleanups which hopefully make the code easier to follow, and fixes bugs found along the way. The end-game which I have not yet reached yet is for fatal signals that generate coredumps to be short-circuit deliverable from complete_signal, for force_siginfo_to_task not to require changing userspace configured signal delivery state, and for the ptrace stops to always happen in locations where we can guarantee on all architectures that the all of the registers are saved and available on the stack. Removal of profile_task_ext, profile_munmap, and profile_handoff_task are the big successes for dead code removal this round. A bunch of small bug fixes are included, as most of the issues reported were small enough that they would not affect bisection so I simply added the fixes and did not fold the fixes into the changes they were fixing. There was a bug that broke coredumps piped to systemd-coredump. I dropped the change that caused that bug and replaced it entirely with something much more restrained. Unfortunately that required some rebasing. Some successes after this set of changes: There are few enough calls to do_exit to audit in a reasonable amount of time. The lifetime of struct kthread now matches the lifetime of struct task, and the pointer to struct kthread is no longer stored in set_child_tid. The flag SIGNAL_GROUP_COREDUMP is removed. The field group_exit_task is removed. Issues where task->exit_code was examined with signal->group_exit_code should been examined were fixed. There are several loosely related changes included because I am cleaning up and if I don't include them they will probably get lost. The original postings of these changes can be found at: https://lkml.kernel.org/r/87a6ha4zsd.fsf@email.froward.int.ebiederm.org https://lkml.kernel.org/r/87bl1kunjj.fsf@email.froward.int.ebiederm.org https://lkml.kernel.org/r/87r19opkx1.fsf_-_@email.froward.int.ebiederm.org I trimmed back the last set of changes to only the obviously correct once. Simply because there was less time for review than I had hoped" * 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (44 commits) ptrace/m68k: Stop open coding ptrace_report_syscall ptrace: Remove unused regs argument from ptrace_report_syscall ptrace: Remove second setting of PT_SEIZED in ptrace_attach taskstats: Cleanup the use of task->exit_code exit: Use the correct exit_code in /proc//stat exit: Fix the exit_code for wait_task_zombie exit: Coredumps reach do_group_exit exit: Remove profile_handoff_task exit: Remove profile_task_exit & profile_munmap signal: clean up kernel-doc comments signal: Remove the helper signal_group_exit signal: Rename group_exit_task group_exec_task coredump: Stop setting signal->group_exit_task signal: Remove SIGNAL_GROUP_COREDUMP signal: During coredumps set SIGNAL_GROUP_EXIT in zap_process signal: Make coredump handling explicit in complete_signal signal: Have prepare_signal detect coredumps using signal->core_state signal: Have the oom killer detect coredumps using signal->core_state exit: Move force_uaccess back into do_exit exit: Guarantee make_task_dead leaks the tsk when calling do_task_exit ...

csky: Fix function name in csky_alignment() and die()

2022-01-08T15:43:03Z

When building ARCH=csky defconfig: arch/csky/kernel/traps.c: In function 'die': arch/csky/kernel/traps.c:112:17: error: implicit declaration of function 'make_dead_task' [-Werror=implicit-function-declaration] 112 | make_dead_task(SIGSEGV); | ^~~~~~~~~~~~~~ The function's name is make_task_dead(), change it so there is no more build error. Fixes: 0e25498f8cd4 ("exit: Add and use make_task_dead.") Signed-off-by: Nathan Chancellor Reviewed-by: Guo Ren Link: https://lkml.kernel.org/r/20211227184851.2297759-4-nathan@kernel.org Signed-off-by: Eric W. Biederman

exit: Add and use make_task_dead.

2021-12-13T18:04:45Z

There are two big uses of do_exit. The first is it's design use to be the guts of the exit(2) system call. The second use is to terminate a task after something catastrophic has happened like a NULL pointer in kernel code. Add a function make_task_dead that is initialy exactly the same as do_exit to cover the cases where do_exit is called to handle catastrophic failure. In time this can probably be reduced to just a light wrapper around do_task_dead. For now keep it exactly the same so that there will be no behavioral differences introducing this new concept. Replace all of the uses of do_exit that use it for catastraphic task cleanup with make_task_dead to make it clear what the code is doing. As part of this rename rewind_stack_do_exit rewind_stack_and_make_dead. Signed-off-by: "Eric W. Biederman"

csky: fix typo of fpu config macro

2021-12-08T06:15:54Z

Fix typo which will cause fpe and privilege exception error. Signed-off-by: Kelly Devilliv Cc: stable Signed-off-by: Guo Ren

csky: Remove prologue of page fault handler in entry.S

2021-01-12T01:52:40Z

There is a prologue on page fault handler which marking pages dirty and/or accessed in page attributes, but all of these have been handled in handle_pte_fault. - Add flush_tlb_one in vmalloc page fault instead of prologue. - Using cmxchg_fixup C codes in do_page_fault instead of ASM one. Signed-off-by: Guo Ren

csky: Optimize the trap processing flow

2020-07-31T01:52:22Z

- Seperate different trap functions - Add trap_no() - Remove panic code print - Redesign die_if_kerenl to die with riscv's - Print exact trap info for app segment fault [ 17.389321] gzip[126]: unhandled signal 11 code 0x3 at 0x0007835a in busybox[8000+d4000] [ 17.393882] [ 17.393882] CURRENT PROCESS: [ 17.393882] [ 17.394309] COMM=gzip PID=126 [ 17.394513] TEXT=00008000-000db2e4 DATA=000dcf14-000dd1ad BSS=000dd1ad-000ff000 [ 17.395499] USER-STACK=7f888e50 KERNEL-STACK=bf130300 [ 17.395499] [ 17.396801] PC: 0x0007835a (0x7835a) [ 17.397048] LR: 0x000058b4 (0x58b4) [ 17.397285] SP: 0xbe519f68 [ 17.397555] orig_a0: 0x00002852 [ 17.397886] PSR: 0x00020341 [ 17.398356] a0: 0x00002852 a1: 0x000f2f5a a2: 0x0000d7ae a3: 0x0000005d [ 17.399289] r4: 0x000de150 r5: 0x00000002 r6: 0x00000102 r7: 0x00007efa [ 17.399800] r8: 0x7f888bc4 r9: 0x00000001 r10: 0x000002eb r11: 0x0000aac1 [ 17.400166] r12: 0x00002ef2 r13: 0x00000007 r15: 0x000058b4 [ 17.400531] r16: 0x0000004c r17: 0x00000031 r18: 0x000f5816 r19: 0x000e8068 [ 17.401006] r20: 0x000f5818 r21: 0x000e8068 r22: 0x000f5918 r23: 0x90000000 [ 17.401721] r24: 0x00000031 r25: 0x000000c8 r26: 0x00000000 r27: 0x00000000 [ 17.402199] r28: 0x2ac2a000 r29: 0x00000000 r30: 0x00000000 tls: 0x2aadbaa8 [ 17.402686] hi: 0x00120340 lo: 0x7f888bec /etc/init.ci/ntfs3g_run: line 61: 126 Segmentation fault gzip -c -9 /mnt/test.bin > /mnt/test_bin.gz Signed-off-by: Guo Ren Cc: Arnd Bergmann

csky: Add uprobes support

2020-04-03T03:37:51Z

This patch adds support for uprobes on csky architecture. Just like kprobe, it support single-step and simulate instructions. Signed-off-by: Guo Ren Cc: Arnd Bergmann Cc: Steven Rostedt (VMware)

csky: Add kprobes supported

2020-04-03T03:14:17Z

This patch enable kprobes, kretprobes, ftrace interface. It utilized software breakpoint and single step debug exceptions, instructions simulation on csky. We use USR_BKPT replace origin instruction, and the kprobe handler prepares an excutable memory slot for out-of-line execution with a copy of the original instruction being probed. Most of instructions could be executed by single-step, but some instructions need origin pc value to execute and we need software simulate these instructions. Signed-off-by: Guo Ren Cc: Arnd Bergmann Cc: Steven Rostedt (VMware)

csky: Fixup get wrong psr value from phyical reg

2020-03-31T16:06:40Z

We should get psr value from regs->psr in stack, not directly get it from phyiscal register then save the vector number in tsk->trap_no. Signed-off-by: Guo Ren

Merge tag 'csky-for-linus-5.3-rc1' of git://github.com/c-sky/csky-linux

2019-07-19T19:15:33Z

Pull arch/csky pupdates from Guo Ren: "This round of csky subsystem gives two features (ASID algorithm update, Perf pmu record support) and some fixups. ASID updates: - Revert mmu ASID mechanism - Add new asid lib code from arm - Use generic asid algorithm to implement switch_mm - Improve tlb operation with help of asid Perf pmu record support: - Init pmu as a device - Add count-width property for csky pmu - Add pmu interrupt support - Fix perf record in kernel/user space - dt-bindings: Add csky PMU bindings Fixes: - Fixup no panic in kernel for some traps - Fixup some error count in 810 & 860. - Fixup abiv1 memset error" * tag 'csky-for-linus-5.3-rc1' of git://github.com/c-sky/csky-linux: csky: Fixup abiv1 memset error csky: Improve tlb operation with help of asid csky: Use generic asid algorithm to implement switch_mm csky: Add new asid lib code from arm csky: Revert mmu ASID mechanism dt-bindings: csky: Add csky PMU bindings dt-bindings: interrupt-controller: Update csky mpintc csky: Fixup some error count in 810 & 860. csky: Fix perf record in kernel/user space csky: Add pmu interrupt support csky: Add count-width property for csky pmu csky: Init pmu as a device csky: Fixup no panic in kernel for some traps csky: Select intc & timer drivers