kernel.git/arch/parisc, branch linux-4.20.y

parisc: Fix ptrace syscall number modification

2019-02-27T09:09:55Z

commit b7dc5a071ddf69c0350396b203cba32fe5bab510 upstream. Commit 910cd32e552e ("parisc: Fix and enable seccomp filter support") introduced a regression in ptrace-based syscall tampering: when tracer changes syscall number to -1, the kernel fails to initialize %r28 with -ENOSYS and subsequently fails to return the error code of the failed syscall to userspace. This erroneous behaviour could be observed with a simple strace syscall fault injection command which is expected to print something like this: $ strace -a0 -ewrite -einject=write:error=enospc echo hello write(1, "hello\n", 6) = -1 ENOSPC (No space left on device) (INJECTED) write(2, "echo: ", 6) = -1 ENOSPC (No space left on device) (INJECTED) write(2, "write error", 11) = -1 ENOSPC (No space left on device) (INJECTED) write(2, "\n", 1) = -1 ENOSPC (No space left on device) (INJECTED) +++ exited with 1 +++ After commit 910cd32e552ea09caa89cdbe328e468979b030dd it loops printing something like this instead: write(1, "hello\n", 6../strace: Failed to tamper with process 12345: unexpectedly got no error (return value 0, error 0) ) = 0 (INJECTED) This bug was found by strace test suite. Fixes: 910cd32e552e ("parisc: Fix and enable seccomp filter support") Cc: stable@vger.kernel.org # v4.5+ Signed-off-by: Dmitry V. Levin Tested-by: Helge Deller Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman

parisc: Remap hugepage-aligned pages in set_kernel_text_rw()

2019-01-09T16:46:05Z

commit dfbaecb2b707cfdc5276b548d52b437384bd6483 upstream. The alternative coding patch for parisc in kernel 4.20 broke booting machines with PA8500-PA8700 CPUs. The problem is, that for such machines the parisc kernel automatically utilizes huge pages to access kernel text code, but the set_kernel_text_rw() function, which is used shortly before applying any alternative patches, didn't used the correctly hugepage-aligned addresses to remap the kernel text read-writeable. Fixes: 3847dab77421 ("parisc: Add alternative coding infrastructure") Cc: [4.20] Signed-off-by: Helge Deller Signed-off-by: Greg Kroah-Hartman

Merge branch 'parisc-4.20-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2018-12-04T17:10:39Z

Pull parisc fix from Helge Deller: "On parisc, use -ffunction-sections compiler option when building 32-bit kernel modules to avoid sysfs-warnings when loading such modules. This got broken with kernel v4.18" * 'parisc-4.20-4' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Enable -ffunction-sections for modules on 32-bit kernel

parisc: Enable -ffunction-sections for modules on 32-bit kernel

2018-12-02T19:34:07Z

Frank Schreiner reported, that since kernel 4.18 he faces sysfs-warnings when loading modules on a 32-bit kernel. Here is one such example: sysfs: cannot create duplicate filename '/module/nfs/sections/.text' CPU: 0 PID: 98 Comm: modprobe Not tainted 4.18.0-2-parisc #1 Debian 4.18.10-2 Backtrace: [<1017ce2c>] show_stack+0x3c/0x50 [<107a7210>] dump_stack+0x28/0x38 [<103f900c>] sysfs_warn_dup+0x88/0xac [<103f8b1c>] sysfs_add_file_mode_ns+0x164/0x1d0 [<103f9e70>] internal_create_group+0x11c/0x304 [<103fa0a0>] sysfs_create_group+0x48/0x60 [<1022abe8>] load_module.constprop.35+0x1f9c/0x23b8 [<1022b278>] sys_finit_module+0xd0/0x11c [<101831dc>] syscall_exit+0x0/0x14 This warning gets triggered by the fact, that due to commit 24b6c22504a2 ("parisc: Build kernel without -ffunction-sections") we now get multiple .text sections in the kernel modules for which sysfs_create_group() can't create multiple virtual files. This patch works around the problem by re-enabling the -ffunction-sections compiler option for modules, while keeping it disabled for the non-module kernel code. Reported-by: Frank Scheiner Fixes: 24b6c22504a2 ("parisc: Build kernel without -ffunction-sections") Cc: # v4.18+ Signed-off-by: Helge Deller

parisc: function_graph: Simplify with function_graph_enter()

2018-11-28T01:30:52Z

The function_graph_enter() function does the work of calling the function graph hook function and the management of the shadow stack, simplifying the work done in the architecture dependent prepare_ftrace_return(). Have parisc use the new code, and remove the shadow stack management as well as having to set up the trace structure. This is needed to prepare for a fix of a design bug on how the curr_ret_stack is used. Cc: "James E.J. Bottomley" Cc: Helge Deller Cc: linux-parisc@vger.kernel.org Cc: stable@kernel.org Fixes: 03274a3ffb449 ("tracing/fgraph: Adjust fgraph depth before calling trace return callback") Reviewed-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware)

Merge branch 'parisc-4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux

2018-11-14T19:42:41Z

Pull parisc fix from Helge Deller: "Revert one patch which changed how spinlocks get released. It breaks the rwlock implementation in glibc" * 'parisc-4.20-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Revert "Release spinlocks using ordered store"

Merge tag 's390-4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2018-11-09T12:30:44Z

Pull s390 fixes from Martin Schwidefsky: - A fix for the pgtable_bytes misaccounting on s390. The patch changes common code part in regard to page table folding and adds extra checks to mm_[inc|dec]_nr_[pmds|puds]. - Add FORCE for all build targets using if_changed - Use non-loadable phdr for the .vmlinux.info section to avoid a segment overlap that confuses kexec - Cleanup the attribute definition for the diagnostic sampling - Increase stack size for CONFIG_KASAN=y builds - Export __node_distance to fix a build error - Correct return code of a PMU event init function - An update for the default configs * tag 's390-4.20-2' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: s390/perf: Change CPUM_CF return code in event init function s390: update defconfigs s390/mm: Fix ERROR: "__node_distance" undefined! s390/kasan: increase instrumented stack size to 64k s390/cpum_sf: Rework attribute definition for diagnostic sampling s390/mm: fix mis-accounting of pgtable_bytes mm: add mm_pxd_folded checks to pgtable_bytes accounting functions mm: introduce mm_[p4d|pud|pmd]_folded mm: make the __PAGETABLE_PxD_FOLDED defines non-empty s390: avoid vmlinux segments overlap s390/vdso: add missing FORCE to build targets s390/decompressor: add missing FORCE to build targets

parisc: Revert "Release spinlocks using ordered store"

2018-11-06T11:03:22Z

This reverts commit d27dfa13b9f77ae7e6ed09d70a0426ed26c1a8f9. Unfortunately, this patch needs to be reverted. We need the full sync barrier and not the limited barrier provided by using an ordered store. The sync ensures that all accesses and cache purge instructions that follow the sync are performed after all such instructions prior the sync instruction have completed executing. The patch breaks the rwlock implementation in glibc. This caused the test-lock application in the libprelude testsuite to hang. With the change reverted, the test runs correctly and the libprelude package builds successfully. Signed-off-by: John David Anglin Signed-off-by: Helge Deller

mm: make the __PAGETABLE_PxD_FOLDED defines non-empty

2018-11-02T07:31:52Z

Change the currently empty defines for __PAGETABLE_PMD_FOLDED, __PAGETABLE_PUD_FOLDED and __PAGETABLE_P4D_FOLDED to return 1. This makes it possible to use __is_defined() to test if the preprocessor define exists. Acked-by: Kirill A. Shutemov Signed-off-by: Martin Schwidefsky

mm: remove include/linux/bootmem.h

2018-10-31T15:54:16Z

Move remaining definitions and declarations from include/linux/bootmem.h into include/linux/memblock.h and remove the redundant header. The includes were replaced with the semantic patch below and then semi-automated removal of duplicated '#include @@ @@ - #include + #include [sfr@canb.auug.org.au: dma-direct: fix up for the removal of linux/bootmem.h] Link: http://lkml.kernel.org/r/20181002185342.133d1680@canb.auug.org.au [sfr@canb.auug.org.au: powerpc: fix up for removal of linux/bootmem.h] Link: http://lkml.kernel.org/r/20181005161406.73ef8727@canb.auug.org.au [sfr@canb.auug.org.au: x86/kaslr, ACPI/NUMA: fix for linux/bootmem.h removal] Link: http://lkml.kernel.org/r/20181008190341.5e396491@canb.auug.org.au Link: http://lkml.kernel.org/r/1536927045-23536-30-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by: Mike Rapoport Signed-off-by: Stephen Rothwell Acked-by: Michal Hocko Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Kroah-Hartman Cc: Guan Xuetao Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Jonas Bonn Cc: Jonathan Corbet Cc: Ley Foon Tan Cc: Mark Salter Cc: Martin Schwidefsky Cc: Matt Turner Cc: Michael Ellerman Cc: Michal Simek Cc: Palmer Dabbelt Cc: Paul Burton Cc: Richard Kuo Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Serge Semin Cc: Thomas Gleixner Cc: Tony Luck Cc: Vineet Gupta Cc: Yoshinori Sato Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds