kernel.git/arch/mips/kernel/signal.c, branch linux-6.9.y

Merge tag 'mips_6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux

2024-01-17T19:20:50Z

Pull MIPS updates from Thomas Bogendoerfer: "Just cleanups and fixes" * tag 'mips_6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: MIPS: Alchemy: Fix an out-of-bound access in db1550_dev_setup() MIPS: Alchemy: Fix an out-of-bound access in db1200_dev_setup() MIPS: Fix typos MIPS: Remove unused shadow GPR support from vector irq setup MIPS: Allow vectored interrupt handler to reside everywhere for 64bit mips: Set dump-stack arch description mips: mm: add slab availability checking in ioremap_prot mips: Optimize max_mapnr init procedure mips: Fix max_mapnr being uninitialized on early stages mips: Fix incorrect max_low_pfn adjustment mips: dmi: Fix early remap on MIPS32 MIPS: compressed: Use correct instruction for 64 bit code MIPS: SGI-IP27: hubio: fix nasid kernel-doc warning MAINTAINERS: Add myself as maintainer of the Ralink architecture

MIPS: Fix typos

2024-01-08T09:39:12Z

Fix typos, most reported by "codespell arch/mips". Only touches comments, no code changes. Signed-off-by: Bjorn Helgaas Cc: linux-mips@vger.kernel.org Reviewed-by: Randy Dunlap Signed-off-by: Thomas Bogendoerfer

mips: add asm/syscalls.h header

2023-12-11T01:21:38Z

System call prototypes are generally in linux/syscalls.h, but there are a couple of mips specific entry points that are missing there: arch/mips/kernel/signal.c:636:17: error: no previous prototype for 'sys_sigreturn' [-Werror=missing-prototypes] arch/mips/kernel/signal.c:673:17: error: no previous prototype for 'sys_rt_sigreturn' [-Werror=missing-prototypes] arch/mips/kernel/syscall.c:51:16: error: no previous prototype for 'sysm_pipe' [-Werror=missing-prototypes] arch/mips/kernel/mips-mt-fpaff.c:65:17: error: no previous prototype for 'mipsmt_sys_sched_setaffinity' [-Werror=missing-prototypes] arch/mips/kernel/mips-mt-fpaff.c:157:17: error: no previous prototype for 'mipsmt_sys_sched_getaffinity' [-Werror=missing-prototypes] Add these to a new asm/syscalls.h as we have in other architectures. Link: https://lkml.kernel.org/r/20231204115710.2247097-3-arnd@kernel.org Signed-off-by: Arnd Bergmann Cc: Stephen Rothwell Cc: Thomas Bogendoerfer Signed-off-by: Andrew Morton

Merge tag 'ptrace-cleanups-for-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2022-03-29T00:29:53Z

Pull ptrace cleanups from Eric Biederman: "This set of changes removes tracehook.h, moves modification of all of the ptrace fields inside of siglock to remove races, adds a missing permission check to ptrace.c The removal of tracehook.h is quite significant as it has been a major source of confusion in recent years. Much of that confusion was around task_work and TIF_NOTIFY_SIGNAL (which I have now decoupled making the semantics clearer). For people who don't know tracehook.h is a vestiage of an attempt to implement uprobes like functionality that was never fully merged, and was later superseeded by uprobes when uprobes was merged. For many years now we have been removing what tracehook functionaly a little bit at a time. To the point where anything left in tracehook.h was some weird strange thing that was difficult to understand" * tag 'ptrace-cleanups-for-v5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: ptrace: Remove duplicated include in ptrace.c ptrace: Check PTRACE_O_SUSPEND_SECCOMP permission on PTRACE_SEIZE ptrace: Return the signal to continue with from ptrace_stop ptrace: Move setting/clearing ptrace_message into ptrace_stop tracehook: Remove tracehook.h resume_user_mode: Move to resume_user_mode.h resume_user_mode: Remove #ifdef TIF_NOTIFY_RESUME in set_notify_resume signal: Move set_notify_signal and clear_notify_signal into sched/signal.h task_work: Decouple TIF_NOTIFY_SIGNAL and task_work task_work: Call tracehook_notify_signal from get_signal on all architectures task_work: Introduce task_work_pending task_work: Remove unnecessary include from posix_timers.h ptrace: Remove tracehook_signal_handler ptrace: Remove arch_syscall_{enter,exit}_tracehook ptrace: Create ptrace_report_syscall_{entry,exit} in ptrace.h ptrace/arm: Rename tracehook_report_syscall report_syscall ptrace: Move ptrace_report_syscall into ptrace.h

resume_user_mode: Move to resume_user_mode.h

2022-03-10T22:51:50Z

Move set_notify_resume and tracehook_notify_resume into resume_user_mode.h. While doing that rename tracehook_notify_resume to resume_user_mode_work. Update all of the places that included tracehook.h for these functions to include resume_user_mode.h instead. Update all of the callers of tracehook_notify_resume to call resume_user_mode_work. Reviewed-by: Kees Cook Link: https://lkml.kernel.org/r/20220309162454.123006-12-ebiederm@xmission.com Signed-off-by: "Eric W. Biederman"

MIPS: remove asm/war.h

2022-02-22T08:35:49Z

The major part for workaround handling has already moved to config options. This change replaces the remaining defines by already available config options and gets rid of war.h Signed-off-by: Thomas Bogendoerfer

MIPS: signal: Return immediately if call fails

2022-01-02T13:16:40Z

When debug sigaltstack(), copy_siginfo_to_user() fails first in setup_rt_frame() if the alternate signal stack is too small, so it should return immediately if call fails, no need to call the following functions. Signed-off-by: Tiezhu Yang Signed-off-by: Thomas Bogendoerfer

MIPS: signal: Protect against sigaltstack wraparound

2022-01-02T13:16:29Z

If a process uses alternative signal stack by using sigaltstack(), then that stack overflows and stack wraparound occurs. Simple Explanation: The accurate sp order is A,B,C,D,... But now the sp points to A,B,C and A,B,C again. This problem can reproduce by the following code: $ cat test_sigaltstack.c #include #include #include #include volatile int counter = 0; void print_sp() { unsigned long sp; __asm__ __volatile__("move %0, $sp" : "=r" (sp)); printf("sp = 0x%08lx\n", sp); } void segv_handler() { int *c = NULL; print_sp(); counter++; printf("%d\n", counter); if (counter == 23) abort(); *c = 1; // SEGV } int main() { int *c = NULL; char *s = malloc(SIGSTKSZ); stack_t stack; struct sigaction action; memset(s, 0, SIGSTKSZ); stack.ss_sp = s; stack.ss_flags = 0; stack.ss_size = SIGSTKSZ; if (sigaltstack(&stack, NULL)) { printf("Failed to use sigaltstack!\n"); return -1; } memset(&action, 0, sizeof(action)); action.sa_handler = segv_handler; action.sa_flags = SA_ONSTACK | SA_NODEFER; sigemptyset(&action.sa_mask); sigaction(SIGSEGV, &action, NULL); *c = 0; //SEGV if (!s) free(s); return 0; } $ gcc test_sigaltstack.c -o test_sigaltstack $ ./test_sigaltstack sp = 0x120015c80 1 sp = 0x120015900 2 sp = 0x120015580 3 sp = 0x120015200 4 sp = 0x120014e80 5 sp = 0x120014b00 6 sp = 0x120014780 7 sp = 0x120014400 8 sp = 0x120014080 9 sp = 0x120013d00 10 sp = 0x120015c80 11 # wraparound occurs! the 11nd output is same as 1st. sp = 0x120015900 12 sp = 0x120015580 13 sp = 0x120015200 14 sp = 0x120014e80 15 sp = 0x120014b00 16 sp = 0x120014780 17 sp = 0x120014400 18 sp = 0x120014080 19 sp = 0x120013d00 20 sp = 0x120015c80 21 # wraparound occurs! the 21nd output is same as 1st. sp = 0x120015900 22 sp = 0x120015580 23 Aborted With this patch: $ ./test_sigaltstack sp = 0x120015c80 1 sp = 0x120015900 2 sp = 0x120015580 3 sp = 0x120015200 4 sp = 0x120014e80 5 sp = 0x120014b00 6 sp = 0x120014780 7 sp = 0x120014400 8 sp = 0x120014080 9 Segmentation fault If we are on the alternate signal stack and would overflow it, don't. Return an always-bogus address instead so we will die with SIGSEGV. This patch is similar with commit 83bd01024b1f ("x86: protect against sigaltstack wraparound"). Signed-off-by: Tiezhu Yang Signed-off-by: Thomas Bogendoerfer

entry: rseq: Call rseq_handle_notify_resume() in tracehook_notify_resume()

2021-09-22T14:24:01Z

Invoke rseq_handle_notify_resume() from tracehook_notify_resume() now that the two function are always called back-to-back by architectures that have rseq. The rseq helper is stubbed out for architectures that don't support rseq, i.e. this is a nop across the board. Note, tracehook_notify_resume() is horribly named and arguably does not belong in tracehook.h as literally every line of code in it has nothing to do with tracing. But, that's been true since commit a42c6ded827d ("move key_repace_session_keyring() into tracehook_notify_resume()") first usurped tracehook_notify_resume() back in 2012. Punt cleaning that mess up to future patches. No functional change intended. Acked-by: Mathieu Desnoyers Signed-off-by: Sean Christopherson Message-Id: <20210901203030.1292304-3-seanjc@google.com> Signed-off-by: Paolo Bonzini

mips: add support for TIF_NOTIFY_SIGNAL

2020-11-09T15:16:55Z

Wire up TIF_NOTIFY_SIGNAL handling for mips. Cc: linux-mips@vger.kernel.org Acked-By: Thomas Bogendoerfer Signed-off-by: Jens Axboe