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linux/arch/frv/mm/fault.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

329 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/frv/mm/fault.c
*
* Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
* - Written by David Howells (dhowells@redhat.com)
* - Derived from arch/m68knommu/mm/fault.c
* - Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
* - Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
*
* Based on:
*
* linux/arch/m68k/mm/fault.c
*
* Copyright (C) 1995 Hamish Macdonald
*/
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/hardirq.h>
#include <linux/uaccess.h>
#include <asm/pgtable.h>
#include <asm/gdb-stub.h>
/*****************************************************************************/
/*
* This routine handles page faults. It determines the problem, and
* then passes it off to one of the appropriate routines.
*/
asmlinkage void do_page_fault(int datammu, unsigned long esr0, unsigned long ear0)
{
struct vm_area_struct *vma;
struct mm_struct *mm;
unsigned long _pme, lrai, lrad;
unsigned long flags = 0;
siginfo_t info;
pgd_t *pge;
pud_t *pue;
pte_t *pte;
int fault;
#if 0
const char *atxc[16] = {
[0x0] = "mmu-miss", [0x8] = "multi-dat", [0x9] = "multi-sat",
[0xa] = "tlb-miss", [0xc] = "privilege", [0xd] = "write-prot",
};
printk("do_page_fault(%d,%lx [%s],%lx)\n",
datammu, esr0, atxc[esr0 >> 20 & 0xf], ear0);
#endif
mm = current->mm;
/*
* We fault-in kernel-space virtual memory on-demand. The
* 'reference' page table is init_mm.pgd.
*
* NOTE! We MUST NOT take any locks for this case. We may
* be in an interrupt or a critical region, and should
* only copy the information from the master page table,
* nothing more.
*
* This verifies that the fault happens in kernel space
* and that the fault was a page not present (invalid) error
*/
if (!user_mode(__frame) && (esr0 & ESR0_ATXC) == ESR0_ATXC_AMRTLB_MISS) {
if (ear0 >= VMALLOC_START && ear0 < VMALLOC_END)
goto kernel_pte_fault;
if (ear0 >= PKMAP_BASE && ear0 < PKMAP_END)
goto kernel_pte_fault;
}
info.si_code = SEGV_MAPERR;
/*
* If we're in an interrupt or have no user
* context, we must not take the fault..
*/
if (faulthandler_disabled() || !mm)
goto no_context;
if (user_mode(__frame))
flags |= FAULT_FLAG_USER;
down_read(&mm->mmap_sem);
vma = find_vma(mm, ear0);
if (!vma)
goto bad_area;
if (vma->vm_start <= ear0)
goto good_area;
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
if (user_mode(__frame)) {
/*
* accessing the stack below %esp is always a bug.
* The "+ 32" is there due to some instructions (like
* pusha) doing post-decrement on the stack and that
* doesn't show up until later..
*/
if ((ear0 & PAGE_MASK) + 2 * PAGE_SIZE < __frame->sp) {
#if 0
printk("[%d] ### Access below stack @%lx (sp=%lx)\n",
current->pid, ear0, __frame->sp);
show_registers(__frame);
printk("[%d] ### Code: [%08lx] %02x %02x %02x %02x %02x %02x %02x %02x\n",
current->pid,
__frame->pc,
((u8*)__frame->pc)[0],
((u8*)__frame->pc)[1],
((u8*)__frame->pc)[2],
((u8*)__frame->pc)[3],
((u8*)__frame->pc)[4],
((u8*)__frame->pc)[5],
((u8*)__frame->pc)[6],
((u8*)__frame->pc)[7]
);
#endif
goto bad_area;
}
}
if (expand_stack(vma, ear0))
goto bad_area;
/*
* Ok, we have a good vm_area for this memory access, so
* we can handle it..
*/
good_area:
info.si_code = SEGV_ACCERR;
switch (esr0 & ESR0_ATXC) {
default:
/* handle write to write protected page */
case ESR0_ATXC_WP_EXCEP:
#ifdef TEST_VERIFY_AREA
if (!(user_mode(__frame)))
printk("WP fault at %08lx\n", __frame->pc);
#endif
if (!(vma->vm_flags & VM_WRITE))
goto bad_area;
flags |= FAULT_FLAG_WRITE;
break;
/* handle read from protected page */
case ESR0_ATXC_PRIV_EXCEP:
goto bad_area;
/* handle read, write or exec on absent page
* - can't support write without permitting read
* - don't support execute without permitting read and vice-versa
*/
case ESR0_ATXC_AMRTLB_MISS:
if (!(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
goto bad_area;
break;
}
/*
* If for any reason at all we couldn't handle the fault,
* make sure we exit gracefully rather than endlessly redo
* the fault.
*/
fault = handle_mm_fault(vma, ear0, flags);
if (unlikely(fault & VM_FAULT_ERROR)) {
if (fault & VM_FAULT_OOM)
goto out_of_memory;
else if (fault & VM_FAULT_SIGSEGV)
goto bad_area;
else if (fault & VM_FAULT_SIGBUS)
goto do_sigbus;
BUG();
}
if (fault & VM_FAULT_MAJOR)
current->maj_flt++;
else
current->min_flt++;
up_read(&mm->mmap_sem);
return;
/*
* Something tried to access memory that isn't in our memory map..
* Fix it, but check if it's kernel or user first..
*/
bad_area:
up_read(&mm->mmap_sem);
/* User mode accesses just cause a SIGSEGV */
if (user_mode(__frame)) {
info.si_signo = SIGSEGV;
info.si_errno = 0;
/* info.si_code has been set above */
info.si_addr = (void *) ear0;
force_sig_info(SIGSEGV, &info, current);
return;
}
no_context:
/* are we prepared to handle this kernel fault? */
if (fixup_exception(__frame))
return;
/*
* Oops. The kernel tried to access some bad page. We'll have to
* terminate things with extreme prejudice.
*/
bust_spinlocks(1);
if (ear0 < PAGE_SIZE)
printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference");
else
printk(KERN_ALERT "Unable to handle kernel paging request");
printk(" at virtual addr %08lx\n", ear0);
printk(" PC : %08lx\n", __frame->pc);
printk(" EXC : esr0=%08lx ear0=%08lx\n", esr0, ear0);
asm("lrai %1,%0,#1,#0,#0" : "=&r"(lrai) : "r"(ear0));
asm("lrad %1,%0,#1,#0,#0" : "=&r"(lrad) : "r"(ear0));
printk(KERN_ALERT " LRAI: %08lx\n", lrai);
printk(KERN_ALERT " LRAD: %08lx\n", lrad);
__break_hijack_kernel_event();
pge = pgd_offset(current->mm, ear0);
pue = pud_offset(pge, ear0);
_pme = pue->pue[0].ste[0];
printk(KERN_ALERT " PGE : %8p { PME %08lx }\n", pge, _pme);
if (_pme & xAMPRx_V) {
unsigned long dampr, damlr, val;
asm volatile("movsg dampr2,%0 ! movgs %2,dampr2 ! movsg damlr2,%1"
: "=&r"(dampr), "=r"(damlr)
: "r" (_pme | xAMPRx_L|xAMPRx_SS_16Kb|xAMPRx_S|xAMPRx_C|xAMPRx_V)
);
pte = (pte_t *) damlr + __pte_index(ear0);
val = pte_val(*pte);
asm volatile("movgs %0,dampr2" :: "r" (dampr));
printk(KERN_ALERT " PTE : %8p { %08lx }\n", pte, val);
}
die_if_kernel("Oops\n");
do_exit(SIGKILL);
/*
* We ran out of memory, or some other thing happened to us that made
* us unable to handle the page fault gracefully.
*/
out_of_memory:
up_read(&mm->mmap_sem);
if (!user_mode(__frame))
goto no_context;
pagefault_out_of_memory();
return;
do_sigbus:
up_read(&mm->mmap_sem);
/*
* Send a sigbus, regardless of whether we were in kernel
* or user mode.
*/
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRERR;
info.si_addr = (void *) ear0;
force_sig_info(SIGBUS, &info, current);
/* Kernel mode? Handle exceptions or die */
if (!user_mode(__frame))
goto no_context;
return;
/*
* The fault was caused by a kernel PTE (such as installed by vmalloc or kmap)
*/
kernel_pte_fault:
{
/*
* Synchronize this task's top level page-table
* with the 'reference' page table.
*
* Do _not_ use "tsk" here. We might be inside
* an interrupt in the middle of a task switch..
*/
int index = pgd_index(ear0);
pgd_t *pgd, *pgd_k;
pud_t *pud, *pud_k;
pmd_t *pmd, *pmd_k;
pte_t *pte_k;
pgd = (pgd_t *) __get_TTBR();
pgd = (pgd_t *)__va(pgd) + index;
pgd_k = ((pgd_t *)(init_mm.pgd)) + index;
if (!pgd_present(*pgd_k))
goto no_context;
//set_pgd(pgd, *pgd_k); /////// gcc ICE's on this line
pud_k = pud_offset(pgd_k, ear0);
if (!pud_present(*pud_k))
goto no_context;
pmd_k = pmd_offset(pud_k, ear0);
if (!pmd_present(*pmd_k))
goto no_context;
pud = pud_offset(pgd, ear0);
pmd = pmd_offset(pud, ear0);
set_pmd(pmd, *pmd_k);
pte_k = pte_offset_kernel(pmd_k, ear0);
if (!pte_present(*pte_k))
goto no_context;
return;
}
} /* end do_page_fault() */
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