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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2008-07-30 01:29:19 +08:00
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#ifndef __ASM_X86_XSAVE_H
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#define __ASM_X86_XSAVE_H
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2008-07-30 08:23:16 +08:00
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#include <linux/types.h>
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2008-07-30 01:29:19 +08:00
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#include <asm/processor.h>
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2015-04-30 14:53:18 +08:00
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#include <linux/uaccess.h>
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2008-07-30 01:29:19 +08:00
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2014-02-22 01:39:02 +08:00
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/* Bit 63 of XCR0 is reserved for future expansion */
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2015-09-03 07:31:26 +08:00
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#define XFEATURE_MASK_EXTEND (~(XFEATURE_MASK_FPSSE | (1ULL << 63)))
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2008-07-30 01:29:19 +08:00
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2015-04-28 15:40:26 +08:00
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#define XSTATE_CPUID 0x0000000d
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2008-07-30 01:29:19 +08:00
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#define FXSAVE_SIZE 512
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2010-06-13 17:29:39 +08:00
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#define XSAVE_HDR_SIZE 64
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#define XSAVE_HDR_OFFSET FXSAVE_SIZE
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#define XSAVE_YMM_SIZE 256
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#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
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2010-05-17 17:22:23 +08:00
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2016-06-18 04:07:16 +08:00
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/* Supervisor features */
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#define XFEATURE_MASK_SUPERVISOR (XFEATURE_MASK_PT)
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2016-10-05 08:34:32 +08:00
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/* All currently supported features */
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#define XCNTXT_MASK (XFEATURE_MASK_FP | \
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2016-03-10 08:28:54 +08:00
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XFEATURE_MASK_SSE | \
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2015-09-03 07:31:26 +08:00
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XFEATURE_MASK_YMM | \
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2016-01-07 06:24:54 +08:00
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XFEATURE_MASK_OPMASK | \
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2015-09-03 07:31:26 +08:00
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XFEATURE_MASK_ZMM_Hi256 | \
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2016-02-13 05:02:04 +08:00
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XFEATURE_MASK_Hi16_ZMM | \
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2016-10-05 08:34:32 +08:00
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XFEATURE_MASK_PKRU | \
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XFEATURE_MASK_BNDREGS | \
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XFEATURE_MASK_BNDCSR)
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2008-07-30 01:29:19 +08:00
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2008-07-30 01:29:20 +08:00
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#ifdef CONFIG_X86_64
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#define REX_PREFIX "0x48, "
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#else
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#define REX_PREFIX
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#endif
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2015-04-24 15:20:33 +08:00
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extern u64 xfeatures_mask;
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2010-02-12 03:50:59 +08:00
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extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
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2008-07-30 01:29:19 +08:00
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2016-08-09 07:29:06 +08:00
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extern void __init update_regset_xstate_info(unsigned int size,
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u64 xstate_mask);
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2008-07-30 01:29:20 +08:00
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2015-09-03 07:31:24 +08:00
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void fpu__xstate_clear_all_cpu_caps(void);
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2015-04-30 23:15:32 +08:00
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void *get_xsave_addr(struct xregs_state *xsave, int xstate);
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x86/fpu/xstate: Wrap get_xsave_addr() to make it safer
The MPX code appears is calling a low-level FPU function
(copy_fpregs_to_fpstate()). This function is not able to
be called in all contexts, although it is safe to call
directly in some cases.
Although probably correct, the current code is ugly and
potentially error-prone. So, add a wrapper that calls
the (slightly) higher-level fpu__save() (which is preempt-
safe) and also ensures that we even *have* an FPU context
(in the case that this was called when in lazy FPU mode).
Ingo had this to say about the details about when we need
preemption disabled:
> it's indeed generally unsafe to access/copy FPU registers with preemption enabled,
> for two reasons:
>
> - on older systems that use FSAVE the instruction destroys FPU register
> contents, which has to be handled carefully
>
> - even on newer systems if we copy to FPU registers (which this code doesn't)
> then we don't want a context switch to occur in the middle of it, because a
> context switch will write to the fpstate, potentially overwriting our new data
> with old FPU state.
>
> But it's safe to access FPU registers with preemption enabled in a couple of
> special cases:
>
> - potentially destructively saving FPU registers: the signal handling code does
> this in copy_fpstate_to_sigframe(), because it can rely on the signal restore
> side to restore the original FPU state.
>
> - reading FPU registers on modern systems: we don't do this anywhere at the
> moment, mostly to keep symmetry with older systems where FSAVE is
> destructive.
>
> - initializing FPU registers on modern systems: fpu__clear() does this. Here
> it's safe because we don't copy from the fpstate.
>
> - directly writing FPU registers from user-space memory (!). We do this in
> fpu__restore_sig(), and it's safe because neither context switches nor
> irq-handler FPU use can corrupt the source context of the copy (which is
> user-space memory).
>
> Note that the MPX code's current use of copy_fpregs_to_fpstate() was safe I think,
> because:
>
> - MPX is predicated on eagerfpu, so the destructive F[N]SAVE instruction won't be
> used.
>
> - the code was only reading FPU registers, and was doing it only in places that
> guaranteed that an FPU state was already active (i.e. didn't do it in
> kthreads)
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave@sr71.net>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Cc: bp@alien8.de
Link: http://lkml.kernel.org/r/20150607183700.AA881696@viggo.jf.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-06-08 02:37:00 +08:00
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const void *get_xsave_field_ptr(int xstate_field);
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2016-05-21 01:47:08 +08:00
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int using_compacted_format(void);
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2017-09-23 20:59:51 +08:00
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int copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
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int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
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2017-09-23 20:59:57 +08:00
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int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf);
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int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf);
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2017-09-24 18:59:04 +08:00
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/* Validate an xstate header supplied by userspace (ptrace or sigreturn) */
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extern int validate_xstate_header(const struct xstate_header *hdr);
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2008-07-30 01:29:19 +08:00
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#endif
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