1. 23 Jun, 2021 31 commits
  2. 22 Jun, 2021 2 commits
    • Thomas Gleixner's avatar
      x86/fpu: Make init_fpstate correct with optimized XSAVE · f9dfb5e3
      Thomas Gleixner authored
      The XSAVE init code initializes all enabled and supported components with
      XRSTOR(S) to init state. Then it XSAVEs the state of the components back
      into init_fpstate which is used in several places to fill in the init state
      of components.
      
      This works correctly with XSAVE, but not with XSAVEOPT and XSAVES because
      those use the init optimization and skip writing state of components which
      are in init state. So init_fpstate.xsave still contains all zeroes after
      this operation.
      
      There are two ways to solve that:
      
         1) Use XSAVE unconditionally, but that requires to reshuffle the buffer when
            XSAVES is enabled because XSAVES uses compacted format.
      
         2) Save the components which are known to have a non-zero init state by other
            means.
      
      Looking deeper, #2 is the right thing to do because all components the
      kernel supports have all-zeroes init state except the legacy features (FP,
      SSE). Those cannot be hard coded because the states are not identical on all
      CPUs, but they can be saved with FXSAVE which avoids all conditionals.
      
      Use FXSAVE to save the legacy FP/SSE components in init_fpstate along with
      a BUILD_BUG_ON() which reminds developers to validate that a newly added
      component has all zeroes init state. As a bonus remove the now unused
      copy_xregs_to_kernel_booting() crutch.
      
      The XSAVE and reshuffle method can still be implemented in the unlikely
      case that components are added which have a non-zero init state and no
      other means to save them. For now, FXSAVE is just simple and good enough.
      
        [ bp: Fix a typo or two in the text. ]
      
      Fixes: 6bad06b7 ("x86, xsave: Use xsaveopt in context-switch path when supported")
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Reviewed-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: stable@vger.kernel.org
      Link: https://lkml.kernel.org/r/20210618143444.587311343@linutronix.de
      f9dfb5e3
    • Thomas Gleixner's avatar
      x86/fpu: Preserve supervisor states in sanitize_restored_user_xstate() · 9301982c
      Thomas Gleixner authored
      sanitize_restored_user_xstate() preserves the supervisor states only
      when the fx_only argument is zero, which allows unprivileged user space
      to put supervisor states back into init state.
      
      Preserve them unconditionally.
      
       [ bp: Fix a typo or two in the text. ]
      
      Fixes: 5d6b6a6f ("x86/fpu/xstate: Update sanitize_restored_xstate() for supervisor xstates")
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
      Cc: stable@vger.kernel.org
      Link: https://lkml.kernel.org/r/20210618143444.438635017@linutronix.de
      9301982c
  3. 20 Jun, 2021 4 commits
  4. 19 Jun, 2021 3 commits
    • Linus Torvalds's avatar
      Merge tag 'powerpc-5.13-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux · b84a7c28
      Linus Torvalds authored
      Pull powerpc fixes from Michael Ellerman:
       "Fix initrd corruption caused by our recent change to use relative jump
        labels.
      
        Fix a crash using perf record on systems without a hardware PMU
        backend.
      
        Rework our 64-bit signal handling slighty to make it more closely
        match the old behaviour, after the recent change to use unsafe user
        accessors.
      
        Thanks to Anastasia Kovaleva, Athira Rajeev, Christophe Leroy, Daniel
        Axtens, Greg Kurz, and Roman Bolshakov"
      
      * tag 'powerpc-5.13-6' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
        powerpc/perf: Fix crash in perf_instruction_pointer() when ppmu is not set
        powerpc: Fix initrd corruption with relative jump labels
        powerpc/signal64: Copy siginfo before changing regs->nip
        powerpc/mem: Add back missing header to fix 'no previous prototype' error
      b84a7c28
    • Linus Torvalds's avatar
      Merge tag 'perf-tools-fixes-for-v5.13-2021-06-19' of... · 913ec3c2
      Linus Torvalds authored
      Merge tag 'perf-tools-fixes-for-v5.13-2021-06-19' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux
      
      Pull perf tools fixes from Arnaldo Carvalho de Melo:
      
       - Fix refcount usage when processing PERF_RECORD_KSYMBOL.
      
       - 'perf stat' metric group fixes.
      
       - Fix 'perf test' non-bash issue with stat bpf counters.
      
       - Update unistd, in.h and socket.h with the kernel sources, silencing
         perf build warnings.
      
      * tag 'perf-tools-fixes-for-v5.13-2021-06-19' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux:
        tools headers UAPI: Sync linux/in.h copy with the kernel sources
        tools headers UAPI: Sync asm-generic/unistd.h with the kernel original
        perf beauty: Update copy of linux/socket.h with the kernel sources
        perf test: Fix non-bash issue with stat bpf counters
        perf machine: Fix refcount usage when processing PERF_RECORD_KSYMBOL
        perf metricgroup: Return error code from metricgroup__add_metric_sys_event_iter()
        perf metricgroup: Fix find_evsel_group() event selector
      913ec3c2
    • Linus Torvalds's avatar
      Merge tag 'riscv-for-linus-5.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux · d9403d30
      Linus Torvalds authored
      Pull RISC-V fixes from Palmer Dabbelt:
      
       - A build fix to always build modules with the 'medany' code model, as
         the module loader doesn't support 'medlow'.
      
       - A Kconfig warning fix for the SiFive errata.
      
       - A pair of fixes that for regressions to the recent memory layout
         changes.
      
       - A fix for the FU740 device tree.
      
      * tag 'riscv-for-linus-5.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
        riscv: dts: fu740: fix cache-controller interrupts
        riscv: Ensure BPF_JIT_REGION_START aligned with PMD size
        riscv: kasan: Fix MODULES_VADDR evaluation due to local variables' name
        riscv: sifive: fix Kconfig errata warning
        riscv32: Use medany C model for modules
      d9403d30