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>
2017-11-01 22:07:57 +08:00
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// SPDX-License-Identifier: GPL-2.0
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2011-03-16 00:08:22 +08:00
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/*
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* Copyright IBM Corp. 2011
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* Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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2012-11-02 19:56:43 +08:00
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#include <linux/hugetlb.h>
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2011-03-16 00:08:22 +08:00
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#include <linux/mm.h>
|
2011-10-30 22:17:13 +08:00
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#include <asm/cacheflush.h>
|
2014-09-24 03:29:20 +08:00
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#include <asm/facility.h>
|
2011-03-16 00:08:22 +08:00
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#include <asm/pgtable.h>
|
2017-06-16 23:51:15 +08:00
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#include <asm/pgalloc.h>
|
2012-11-02 19:56:43 +08:00
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#include <asm/page.h>
|
2017-05-09 06:58:08 +08:00
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#include <asm/set_memory.h>
|
2012-11-02 19:56:43 +08:00
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|
2013-03-14 23:46:05 +08:00
|
|
|
static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
|
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|
|
{
|
2018-07-13 18:28:25 +08:00
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|
asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],1,0"
|
2013-03-14 23:46:05 +08:00
|
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: [addr] "+a" (addr) : [skey] "d" (skey));
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|
return addr;
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|
}
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|
2013-10-07 18:12:32 +08:00
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void __storage_key_init_range(unsigned long start, unsigned long end)
|
2012-11-02 19:56:43 +08:00
|
|
|
{
|
2013-03-14 23:46:05 +08:00
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|
|
unsigned long boundary, size;
|
2012-11-02 19:56:43 +08:00
|
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|
|
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|
while (start < end) {
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|
if (MACHINE_HAS_EDAT1) {
|
|
|
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|
/* set storage keys for a 1MB frame */
|
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|
size = 1UL << 20;
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|
boundary = (start + size) & ~(size - 1);
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|
|
|
|
if (boundary <= end) {
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|
do {
|
2013-03-14 23:46:05 +08:00
|
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start = sske_frame(start, PAGE_DEFAULT_KEY);
|
2012-11-02 19:56:43 +08:00
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} while (start < boundary);
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|
continue;
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}
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|
}
|
2018-07-13 18:28:25 +08:00
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page_set_storage_key(start, PAGE_DEFAULT_KEY, 1);
|
2012-11-02 19:56:43 +08:00
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start += PAGE_SIZE;
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}
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}
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2011-03-16 00:08:22 +08:00
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|
2016-05-20 14:08:14 +08:00
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#ifdef CONFIG_PROC_FS
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atomic_long_t direct_pages_count[PG_DIRECT_MAP_MAX];
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void arch_report_meminfo(struct seq_file *m)
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{
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seq_printf(m, "DirectMap4k: %8lu kB\n",
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|
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atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_4K]) << 2);
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seq_printf(m, "DirectMap1M: %8lu kB\n",
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|
|
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atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_1M]) << 10);
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seq_printf(m, "DirectMap2G: %8lu kB\n",
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|
|
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atomic_long_read(&direct_pages_count[PG_DIRECT_MAP_2G]) << 21);
|
|
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|
|
}
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|
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|
#endif /* CONFIG_PROC_FS */
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|
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|
2016-05-17 16:50:15 +08:00
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|
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static void pgt_set(unsigned long *old, unsigned long new, unsigned long addr,
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unsigned long dtt)
|
2012-10-01 22:18:46 +08:00
|
|
|
{
|
2016-05-17 16:50:15 +08:00
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|
|
unsigned long table, mask;
|
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|
mask = 0;
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|
|
if (MACHINE_HAS_EDAT2) {
|
|
|
|
|
switch (dtt) {
|
|
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|
|
case CRDTE_DTT_REGION3:
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|
mask = ~(PTRS_PER_PUD * sizeof(pud_t) - 1);
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|
|
break;
|
|
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|
|
case CRDTE_DTT_SEGMENT:
|
|
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|
|
mask = ~(PTRS_PER_PMD * sizeof(pmd_t) - 1);
|
|
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|
break;
|
|
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|
case CRDTE_DTT_PAGE:
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|
mask = ~(PTRS_PER_PTE * sizeof(pte_t) - 1);
|
|
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|
break;
|
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|
|
}
|
|
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table = (unsigned long)old & mask;
|
|
|
|
|
crdte(*old, new, table, dtt, addr, S390_lowcore.kernel_asce);
|
|
|
|
|
} else if (MACHINE_HAS_IDTE) {
|
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|
|
cspg(old, *old, new);
|
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|
} else {
|
|
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|
|
csp((unsigned int *)old + 1, *old, new);
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|
}
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|
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|
}
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static int walk_pte_level(pmd_t *pmdp, unsigned long addr, unsigned long end,
|
2016-03-22 17:54:24 +08:00
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unsigned long flags)
|
2016-05-17 16:50:15 +08:00
|
|
|
{
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|
pte_t *ptep, new;
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ptep = pte_offset(pmdp, addr);
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do {
|
2016-03-22 17:54:24 +08:00
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new = *ptep;
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|
if (pte_none(new))
|
2016-05-17 16:50:15 +08:00
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|
return -EINVAL;
|
2016-03-22 17:54:24 +08:00
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|
if (flags & SET_MEMORY_RO)
|
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|
new = pte_wrprotect(new);
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|
else if (flags & SET_MEMORY_RW)
|
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|
new = pte_mkwrite(pte_mkdirty(new));
|
2017-04-24 21:27:35 +08:00
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|
if (flags & SET_MEMORY_NX)
|
2016-03-22 17:54:24 +08:00
|
|
|
pte_val(new) |= _PAGE_NOEXEC;
|
|
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|
else if (flags & SET_MEMORY_X)
|
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|
pte_val(new) &= ~_PAGE_NOEXEC;
|
2016-05-17 16:50:15 +08:00
|
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|
pgt_set((unsigned long *)ptep, pte_val(new), addr, CRDTE_DTT_PAGE);
|
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|
ptep++;
|
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|
addr += PAGE_SIZE;
|
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|
|
cond_resched();
|
|
|
|
|
} while (addr < end);
|
|
|
|
|
return 0;
|
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|
|
|
}
|
|
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|
|
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|
|
|
static int split_pmd_page(pmd_t *pmdp, unsigned long addr)
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|
|
|
|
{
|
|
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|
|
unsigned long pte_addr, prot;
|
|
|
|
|
pte_t *pt_dir, *ptep;
|
|
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|
pmd_t new;
|
2016-03-22 17:54:24 +08:00
|
|
|
int i, ro, nx;
|
2016-05-17 16:50:15 +08:00
|
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pt_dir = vmem_pte_alloc();
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|
if (!pt_dir)
|
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|
return -ENOMEM;
|
|
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|
|
pte_addr = pmd_pfn(*pmdp) << PAGE_SHIFT;
|
|
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|
|
ro = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT);
|
2016-03-22 17:54:24 +08:00
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nx = !!(pmd_val(*pmdp) & _SEGMENT_ENTRY_NOEXEC);
|
2016-05-17 16:50:15 +08:00
|
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|
prot = pgprot_val(ro ? PAGE_KERNEL_RO : PAGE_KERNEL);
|
2016-03-22 17:54:24 +08:00
|
|
|
if (!nx)
|
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|
|
prot &= ~_PAGE_NOEXEC;
|
2016-05-17 16:50:15 +08:00
|
|
|
ptep = pt_dir;
|
|
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|
for (i = 0; i < PTRS_PER_PTE; i++) {
|
|
|
|
|
pte_val(*ptep) = pte_addr | prot;
|
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|
pte_addr += PAGE_SIZE;
|
|
|
|
|
ptep++;
|
|
|
|
|
}
|
|
|
|
|
pmd_val(new) = __pa(pt_dir) | _SEGMENT_ENTRY;
|
|
|
|
|
pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
|
2016-05-20 14:08:14 +08:00
|
|
|
update_page_count(PG_DIRECT_MAP_4K, PTRS_PER_PTE);
|
|
|
|
|
update_page_count(PG_DIRECT_MAP_1M, -1);
|
2016-05-17 16:50:15 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-03-22 17:54:24 +08:00
|
|
|
static void modify_pmd_page(pmd_t *pmdp, unsigned long addr,
|
|
|
|
|
unsigned long flags)
|
2016-05-17 16:50:15 +08:00
|
|
|
{
|
2016-03-22 17:54:24 +08:00
|
|
|
pmd_t new = *pmdp;
|
|
|
|
|
|
|
|
|
|
if (flags & SET_MEMORY_RO)
|
|
|
|
|
new = pmd_wrprotect(new);
|
|
|
|
|
else if (flags & SET_MEMORY_RW)
|
|
|
|
|
new = pmd_mkwrite(pmd_mkdirty(new));
|
2017-04-24 21:27:35 +08:00
|
|
|
if (flags & SET_MEMORY_NX)
|
2016-03-22 17:54:24 +08:00
|
|
|
pmd_val(new) |= _SEGMENT_ENTRY_NOEXEC;
|
|
|
|
|
else if (flags & SET_MEMORY_X)
|
|
|
|
|
pmd_val(new) &= ~_SEGMENT_ENTRY_NOEXEC;
|
2016-05-17 16:50:15 +08:00
|
|
|
pgt_set((unsigned long *)pmdp, pmd_val(new), addr, CRDTE_DTT_SEGMENT);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int walk_pmd_level(pud_t *pudp, unsigned long addr, unsigned long end,
|
2016-03-22 17:54:24 +08:00
|
|
|
unsigned long flags)
|
2016-05-17 16:50:15 +08:00
|
|
|
{
|
|
|
|
|
unsigned long next;
|
2012-10-01 22:18:46 +08:00
|
|
|
pmd_t *pmdp;
|
2016-05-17 16:50:15 +08:00
|
|
|
int rc = 0;
|
2012-10-01 22:18:46 +08:00
|
|
|
|
|
|
|
|
pmdp = pmd_offset(pudp, addr);
|
2016-05-17 16:50:15 +08:00
|
|
|
do {
|
|
|
|
|
if (pmd_none(*pmdp))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
next = pmd_addr_end(addr, end);
|
|
|
|
|
if (pmd_large(*pmdp)) {
|
|
|
|
|
if (addr & ~PMD_MASK || addr + PMD_SIZE > next) {
|
|
|
|
|
rc = split_pmd_page(pmdp, addr);
|
|
|
|
|
if (rc)
|
|
|
|
|
return rc;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
2016-03-22 17:54:24 +08:00
|
|
|
modify_pmd_page(pmdp, addr, flags);
|
2016-05-17 16:50:15 +08:00
|
|
|
} else {
|
2016-03-22 17:54:24 +08:00
|
|
|
rc = walk_pte_level(pmdp, addr, next, flags);
|
2016-05-17 16:50:15 +08:00
|
|
|
if (rc)
|
|
|
|
|
return rc;
|
|
|
|
|
}
|
|
|
|
|
pmdp++;
|
|
|
|
|
addr = next;
|
|
|
|
|
cond_resched();
|
|
|
|
|
} while (addr < end);
|
|
|
|
|
return rc;
|
2012-10-01 22:18:46 +08:00
|
|
|
}
|
|
|
|
|
|
2016-05-17 16:50:15 +08:00
|
|
|
static int split_pud_page(pud_t *pudp, unsigned long addr)
|
2011-03-16 00:08:22 +08:00
|
|
|
{
|
2016-05-17 16:50:15 +08:00
|
|
|
unsigned long pmd_addr, prot;
|
|
|
|
|
pmd_t *pm_dir, *pmdp;
|
|
|
|
|
pud_t new;
|
2016-03-22 17:54:24 +08:00
|
|
|
int i, ro, nx;
|
2011-03-16 00:08:22 +08:00
|
|
|
|
2017-06-16 23:51:15 +08:00
|
|
|
pm_dir = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
|
2016-05-17 16:50:15 +08:00
|
|
|
if (!pm_dir)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
pmd_addr = pud_pfn(*pudp) << PAGE_SHIFT;
|
|
|
|
|
ro = !!(pud_val(*pudp) & _REGION_ENTRY_PROTECT);
|
2016-03-22 17:54:24 +08:00
|
|
|
nx = !!(pud_val(*pudp) & _REGION_ENTRY_NOEXEC);
|
2016-05-17 16:50:15 +08:00
|
|
|
prot = pgprot_val(ro ? SEGMENT_KERNEL_RO : SEGMENT_KERNEL);
|
2016-03-22 17:54:24 +08:00
|
|
|
if (!nx)
|
|
|
|
|
prot &= ~_SEGMENT_ENTRY_NOEXEC;
|
2016-05-17 16:50:15 +08:00
|
|
|
pmdp = pm_dir;
|
|
|
|
|
for (i = 0; i < PTRS_PER_PMD; i++) {
|
|
|
|
|
pmd_val(*pmdp) = pmd_addr | prot;
|
|
|
|
|
pmd_addr += PMD_SIZE;
|
|
|
|
|
pmdp++;
|
2011-03-16 00:08:22 +08:00
|
|
|
}
|
2016-05-17 16:50:15 +08:00
|
|
|
pud_val(new) = __pa(pm_dir) | _REGION3_ENTRY;
|
|
|
|
|
pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
|
2016-05-20 14:08:14 +08:00
|
|
|
update_page_count(PG_DIRECT_MAP_1M, PTRS_PER_PMD);
|
|
|
|
|
update_page_count(PG_DIRECT_MAP_2G, -1);
|
2016-05-17 16:50:15 +08:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2016-03-22 17:54:24 +08:00
|
|
|
static void modify_pud_page(pud_t *pudp, unsigned long addr,
|
|
|
|
|
unsigned long flags)
|
2016-05-17 16:50:15 +08:00
|
|
|
{
|
2016-03-22 17:54:24 +08:00
|
|
|
pud_t new = *pudp;
|
|
|
|
|
|
|
|
|
|
if (flags & SET_MEMORY_RO)
|
|
|
|
|
new = pud_wrprotect(new);
|
|
|
|
|
else if (flags & SET_MEMORY_RW)
|
|
|
|
|
new = pud_mkwrite(pud_mkdirty(new));
|
2017-04-24 21:27:35 +08:00
|
|
|
if (flags & SET_MEMORY_NX)
|
2016-03-22 17:54:24 +08:00
|
|
|
pud_val(new) |= _REGION_ENTRY_NOEXEC;
|
|
|
|
|
else if (flags & SET_MEMORY_X)
|
|
|
|
|
pud_val(new) &= ~_REGION_ENTRY_NOEXEC;
|
2016-05-17 16:50:15 +08:00
|
|
|
pgt_set((unsigned long *)pudp, pud_val(new), addr, CRDTE_DTT_REGION3);
|
|
|
|
|
}
|
|
|
|
|
|
2017-04-25 00:19:10 +08:00
|
|
|
static int walk_pud_level(p4d_t *p4d, unsigned long addr, unsigned long end,
|
2016-03-22 17:54:24 +08:00
|
|
|
unsigned long flags)
|
2016-05-17 16:50:15 +08:00
|
|
|
{
|
|
|
|
|
unsigned long next;
|
|
|
|
|
pud_t *pudp;
|
|
|
|
|
int rc = 0;
|
|
|
|
|
|
2017-04-25 00:19:10 +08:00
|
|
|
pudp = pud_offset(p4d, addr);
|
2016-05-17 16:50:15 +08:00
|
|
|
do {
|
|
|
|
|
if (pud_none(*pudp))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
next = pud_addr_end(addr, end);
|
|
|
|
|
if (pud_large(*pudp)) {
|
|
|
|
|
if (addr & ~PUD_MASK || addr + PUD_SIZE > next) {
|
|
|
|
|
rc = split_pud_page(pudp, addr);
|
|
|
|
|
if (rc)
|
|
|
|
|
break;
|
|
|
|
|
continue;
|
|
|
|
|
}
|
2016-03-22 17:54:24 +08:00
|
|
|
modify_pud_page(pudp, addr, flags);
|
2016-05-17 16:50:15 +08:00
|
|
|
} else {
|
2016-03-22 17:54:24 +08:00
|
|
|
rc = walk_pmd_level(pudp, addr, next, flags);
|
2016-05-17 16:50:15 +08:00
|
|
|
}
|
|
|
|
|
pudp++;
|
|
|
|
|
addr = next;
|
|
|
|
|
cond_resched();
|
|
|
|
|
} while (addr < end && !rc);
|
|
|
|
|
return rc;
|
|
|
|
|
}
|
|
|
|
|
|
2017-04-25 00:19:10 +08:00
|
|
|
static int walk_p4d_level(pgd_t *pgd, unsigned long addr, unsigned long end,
|
|
|
|
|
unsigned long flags)
|
|
|
|
|
{
|
|
|
|
|
unsigned long next;
|
|
|
|
|
p4d_t *p4dp;
|
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
|
|
p4dp = p4d_offset(pgd, addr);
|
|
|
|
|
do {
|
|
|
|
|
if (p4d_none(*p4dp))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
next = p4d_addr_end(addr, end);
|
|
|
|
|
rc = walk_pud_level(p4dp, addr, next, flags);
|
|
|
|
|
p4dp++;
|
|
|
|
|
addr = next;
|
|
|
|
|
cond_resched();
|
|
|
|
|
} while (addr < end && !rc);
|
|
|
|
|
return rc;
|
|
|
|
|
}
|
|
|
|
|
|
2016-05-17 16:50:15 +08:00
|
|
|
static DEFINE_MUTEX(cpa_mutex);
|
|
|
|
|
|
|
|
|
|
static int change_page_attr(unsigned long addr, unsigned long end,
|
2016-03-22 17:54:24 +08:00
|
|
|
unsigned long flags)
|
2016-05-17 16:50:15 +08:00
|
|
|
{
|
|
|
|
|
unsigned long next;
|
|
|
|
|
int rc = -EINVAL;
|
|
|
|
|
pgd_t *pgdp;
|
|
|
|
|
|
s390/pageattr: handle numpages parameter correctly
Both set_memory_ro() and set_memory_rw() will modify the page
attributes of at least one page, even if the numpages parameter is
zero.
The author expected that calling these functions with numpages == zero
would never happen. However with the new 444d13ff10fb ("modules: add
ro_after_init support") feature this happens frequently.
Therefore do the right thing and make these two functions return
gracefully if nothing should be done.
Fixes crashes on module load like this one:
Unable to handle kernel pointer dereference in virtual kernel address space
Failing address: 000003ff80008000 TEID: 000003ff80008407
Fault in home space mode while using kernel ASCE.
AS:0000000000d18007 R3:00000001e6aa4007 S:00000001e6a10800 P:00000001e34ee21d
Oops: 0004 ilc:3 [#1] SMP
Modules linked in: x_tables
CPU: 10 PID: 1 Comm: systemd Not tainted 4.7.0-11895-g3fa9045 #4
Hardware name: IBM 2964 N96 703 (LPAR)
task: 00000001e9118000 task.stack: 00000001e9120000
Krnl PSW : 0704e00180000000 00000000005677f8 (rb_erase+0xf0/0x4d0)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3
Krnl GPRS: 000003ff80008b20 000003ff80008b20 000003ff80008b70 0000000000b9d608
000003ff80008b20 0000000000000000 00000001e9123e88 000003ff80008950
00000001e485ab40 000003ff00000000 000003ff80008b00 00000001e4858480
0000000100000000 000003ff80008b68 00000000001d5998 00000001e9123c28
Krnl Code: 00000000005677e8: ec1801c3007c cgij %r1,0,8,567b6e
00000000005677ee: e32010100020 cg %r2,16(%r1)
#00000000005677f4: a78401c2 brc 8,567b78
>00000000005677f8: e35010080024 stg %r5,8(%r1)
00000000005677fe: ec5801af007c cgij %r5,0,8,567b5c
0000000000567804: e30050000024 stg %r0,0(%r5)
000000000056780a: ebacf0680004 lmg %r10,%r12,104(%r15)
0000000000567810: 07fe bcr 15,%r14
Call Trace:
([<000003ff80008900>] __this_module+0x0/0xffffffffffffd700 [x_tables])
([<0000000000264fd4>] do_init_module+0x12c/0x220)
([<00000000001da14a>] load_module+0x24e2/0x2b10)
([<00000000001da976>] SyS_finit_module+0xbe/0xd8)
([<0000000000803b26>] system_call+0xd6/0x264)
Last Breaking-Event-Address:
[<000000000056771a>] rb_erase+0x12/0x4d0
Kernel panic - not syncing: Fatal exception: panic_on_oops
Reported-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reported-and-tested-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Fixes: e8a97e42dc98 ("s390/pageattr: allow kernel page table splitting")
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2016-08-09 18:26:28 +08:00
|
|
|
if (addr == end)
|
|
|
|
|
return 0;
|
2016-05-17 16:50:15 +08:00
|
|
|
if (end >= MODULES_END)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
mutex_lock(&cpa_mutex);
|
|
|
|
|
pgdp = pgd_offset_k(addr);
|
|
|
|
|
do {
|
|
|
|
|
if (pgd_none(*pgdp))
|
|
|
|
|
break;
|
|
|
|
|
next = pgd_addr_end(addr, end);
|
2017-04-25 00:19:10 +08:00
|
|
|
rc = walk_p4d_level(pgdp, addr, next, flags);
|
2016-05-17 16:50:15 +08:00
|
|
|
if (rc)
|
|
|
|
|
break;
|
|
|
|
|
cond_resched();
|
|
|
|
|
} while (pgdp++, addr = next, addr < end && !rc);
|
|
|
|
|
mutex_unlock(&cpa_mutex);
|
|
|
|
|
return rc;
|
2011-03-16 00:08:22 +08:00
|
|
|
}
|
|
|
|
|
|
2016-03-22 17:54:24 +08:00
|
|
|
int __set_memory(unsigned long addr, int numpages, unsigned long flags)
|
2011-03-16 00:08:22 +08:00
|
|
|
{
|
2017-04-24 21:27:35 +08:00
|
|
|
if (!MACHINE_HAS_NX)
|
|
|
|
|
flags &= ~(SET_MEMORY_NX | SET_MEMORY_X);
|
|
|
|
|
if (!flags)
|
|
|
|
|
return 0;
|
2016-05-17 16:50:15 +08:00
|
|
|
addr &= PAGE_MASK;
|
2016-03-22 17:54:24 +08:00
|
|
|
return change_page_attr(addr, addr + numpages * PAGE_SIZE, flags);
|
2011-05-20 06:55:26 +08:00
|
|
|
}
|
2012-11-02 20:28:48 +08:00
|
|
|
|
|
|
|
|
#ifdef CONFIG_DEBUG_PAGEALLOC
|
2014-09-24 03:29:20 +08:00
|
|
|
|
|
|
|
|
static void ipte_range(pte_t *pte, unsigned long address, int nr)
|
|
|
|
|
{
|
|
|
|
|
int i;
|
|
|
|
|
|
2015-02-12 20:08:27 +08:00
|
|
|
if (test_facility(13)) {
|
2016-06-14 18:38:40 +08:00
|
|
|
__ptep_ipte_range(address, nr - 1, pte, IPTE_GLOBAL);
|
2014-09-24 03:29:20 +08:00
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
for (i = 0; i < nr; i++) {
|
2016-07-26 22:00:22 +08:00
|
|
|
__ptep_ipte(address, pte, 0, 0, IPTE_GLOBAL);
|
2014-09-24 03:29:20 +08:00
|
|
|
address += PAGE_SIZE;
|
|
|
|
|
pte++;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2014-12-13 08:55:52 +08:00
|
|
|
void __kernel_map_pages(struct page *page, int numpages, int enable)
|
2012-11-02 20:28:48 +08:00
|
|
|
{
|
|
|
|
|
unsigned long address;
|
2014-09-24 03:29:20 +08:00
|
|
|
int nr, i, j;
|
2012-11-02 20:28:48 +08:00
|
|
|
pgd_t *pgd;
|
2017-04-25 00:19:10 +08:00
|
|
|
p4d_t *p4d;
|
2012-11-02 20:28:48 +08:00
|
|
|
pud_t *pud;
|
|
|
|
|
pmd_t *pmd;
|
|
|
|
|
pte_t *pte;
|
|
|
|
|
|
2014-09-24 03:29:20 +08:00
|
|
|
for (i = 0; i < numpages;) {
|
2012-11-02 20:28:48 +08:00
|
|
|
address = page_to_phys(page + i);
|
|
|
|
|
pgd = pgd_offset_k(address);
|
2017-04-25 00:19:10 +08:00
|
|
|
p4d = p4d_offset(pgd, address);
|
|
|
|
|
pud = pud_offset(p4d, address);
|
2012-11-02 20:28:48 +08:00
|
|
|
pmd = pmd_offset(pud, address);
|
|
|
|
|
pte = pte_offset_kernel(pmd, address);
|
2014-09-24 03:29:20 +08:00
|
|
|
nr = (unsigned long)pte >> ilog2(sizeof(long));
|
|
|
|
|
nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
|
|
|
|
|
nr = min(numpages - i, nr);
|
|
|
|
|
if (enable) {
|
|
|
|
|
for (j = 0; j < nr; j++) {
|
2016-03-22 17:54:24 +08:00
|
|
|
pte_val(*pte) &= ~_PAGE_INVALID;
|
2014-09-24 03:29:20 +08:00
|
|
|
address += PAGE_SIZE;
|
|
|
|
|
pte++;
|
|
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
ipte_range(pte, address, nr);
|
2012-11-02 20:28:48 +08:00
|
|
|
}
|
2014-09-24 03:29:20 +08:00
|
|
|
i += nr;
|
2012-11-02 20:28:48 +08:00
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#ifdef CONFIG_HIBERNATION
|
|
|
|
|
bool kernel_page_present(struct page *page)
|
|
|
|
|
{
|
|
|
|
|
unsigned long addr;
|
|
|
|
|
int cc;
|
|
|
|
|
|
|
|
|
|
addr = page_to_phys(page);
|
|
|
|
|
asm volatile(
|
|
|
|
|
" lra %1,0(%1)\n"
|
|
|
|
|
" ipm %0\n"
|
|
|
|
|
" srl %0,28"
|
|
|
|
|
: "=d" (cc), "+a" (addr) : : "cc");
|
|
|
|
|
return cc == 0;
|
|
|
|
|
}
|
|
|
|
|
#endif /* CONFIG_HIBERNATION */
|
|
|
|
|
|
|
|
|
|
#endif /* CONFIG_DEBUG_PAGEALLOC */
|