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| author |   Will Deacon <will@kernel.org> | 2020-10-02 12:16:11 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-10-02 12:16:11 +0100 |
| commit | baab853229ec1f291cec6a70ed61ce93159d0997 (patch) | |
| tree | 0da235bb4a50e32d80a5d703eea2a56626113cc1 /arch/arm64/kernel/signal.c | |
| parent | Merge branch 'for-next/ghostbusters' into for-next/core (diff) | |
| parent | arm64: mte: Fix typo in memory tagging ABI documentation (diff) | |
| download | linux-dev-baab853229ec1f291cec6a70ed61ce93159d0997.tar.xz linux-dev-baab853229ec1f291cec6a70ed61ce93159d0997.zip | |
Merge branch 'for-next/mte' into for-next/core
Add userspace support for the Memory Tagging Extension introduced by
Armv8.5.
(Catalin Marinas and others)
* for-next/mte: (30 commits)
arm64: mte: Fix typo in memory tagging ABI documentation
arm64: mte: Add Memory Tagging Extension documentation
arm64: mte: Kconfig entry
arm64: mte: Save tags when hibernating
arm64: mte: Enable swap of tagged pages
mm: Add arch hooks for saving/restoring tags
fs: Handle intra-page faults in copy_mount_options()
arm64: mte: ptrace: Add NT_ARM_TAGGED_ADDR_CTRL regset
arm64: mte: ptrace: Add PTRACE_{PEEK,POKE}MTETAGS support
arm64: mte: Allow {set,get}_tagged_addr_ctrl() on non-current tasks
arm64: mte: Restore the GCR_EL1 register after a suspend
arm64: mte: Allow user control of the generated random tags via prctl()
arm64: mte: Allow user control of the tag check mode via prctl()
mm: Allow arm64 mmap(PROT_MTE) on RAM-based files
arm64: mte: Validate the PROT_MTE request via arch_validate_flags()
mm: Introduce arch_validate_flags()
arm64: mte: Add PROT_MTE support to mmap() and mprotect()
mm: Introduce arch_calc_vm_flag_bits()
arm64: mte: Tags-aware aware memcmp_pages() implementation
arm64: Avoid unnecessary clear_user_page() indirection
...
Diffstat (limited to 'arch/arm64/kernel/signal.c')
| -rw-r--r-- | arch/arm64/kernel/signal.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index f3af68dc1cf8..bdcaaf091e1e 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -749,6 +749,9 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, regs->pstate |= PSR_BTYPE_C; } + /* TCO (Tag Check Override) always cleared for signal handlers */ + regs->pstate &= ~PSR_TCO_BIT; + if (ka->sa.sa_flags & SA_RESTORER) sigtramp = ka->sa.sa_restorer; else @@ -933,6 +936,12 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, if (thread_flags & _TIF_UPROBE) uprobe_notify_resume(regs); + if (thread_flags & _TIF_MTE_ASYNC_FAULT) { + clear_thread_flag(TIF_MTE_ASYNC_FAULT); + send_sig_fault(SIGSEGV, SEGV_MTEAERR, + (void __user *)NULL, current); + } + if (thread_flags & _TIF_SIGPENDING) do_signal(regs); |