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linux/arch/s390/kernel/uprobes.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

389 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* User-space Probes (UProbes) for s390
*
* Copyright IBM Corp. 2014
* Author(s): Jan Willeke,
*/
#include <linux/uaccess.h>
#include <linux/uprobes.h>
#include <linux/compat.h>
#include <linux/kdebug.h>
#include <linux/sched/task_stack.h>
#include <asm/switch_to.h>
#include <asm/facility.h>
#include <asm/kprobes.h>
#include <asm/dis.h>
#include "entry.h"
#define UPROBE_TRAP_NR UINT_MAX
int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, struct mm_struct *mm,
unsigned long addr)
{
return probe_is_prohibited_opcode(auprobe->insn);
}
int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
if (psw_bits(regs->psw).eaba == PSW_BITS_AMODE_24BIT)
return -EINVAL;
if (!is_compat_task() && psw_bits(regs->psw).eaba == PSW_BITS_AMODE_31BIT)
return -EINVAL;
clear_pt_regs_flag(regs, PIF_PER_TRAP);
auprobe->saved_per = psw_bits(regs->psw).per;
auprobe->saved_int_code = regs->int_code;
regs->int_code = UPROBE_TRAP_NR;
regs->psw.addr = current->utask->xol_vaddr;
set_tsk_thread_flag(current, TIF_UPROBE_SINGLESTEP);
update_cr_regs(current);
return 0;
}
bool arch_uprobe_xol_was_trapped(struct task_struct *tsk)
{
struct pt_regs *regs = task_pt_regs(tsk);
if (regs->int_code != UPROBE_TRAP_NR)
return true;
return false;
}
static int check_per_event(unsigned short cause, unsigned long control,
struct pt_regs *regs)
{
if (!(regs->psw.mask & PSW_MASK_PER))
return 0;
/* user space single step */
if (control == 0)
return 1;
/* over indication for storage alteration */
if ((control & 0x20200000) && (cause & 0x2000))
return 1;
if (cause & 0x8000) {
/* all branches */
if ((control & 0x80800000) == 0x80000000)
return 1;
/* branch into selected range */
if (((control & 0x80800000) == 0x80800000) &&
regs->psw.addr >= current->thread.per_user.start &&
regs->psw.addr <= current->thread.per_user.end)
return 1;
}
return 0;
}
int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
int fixup = probe_get_fixup_type(auprobe->insn);
struct uprobe_task *utask = current->utask;
clear_tsk_thread_flag(current, TIF_UPROBE_SINGLESTEP);
update_cr_regs(current);
psw_bits(regs->psw).per = auprobe->saved_per;
regs->int_code = auprobe->saved_int_code;
if (fixup & FIXUP_PSW_NORMAL)
regs->psw.addr += utask->vaddr - utask->xol_vaddr;
if (fixup & FIXUP_RETURN_REGISTER) {
int reg = (auprobe->insn[0] & 0xf0) >> 4;
regs->gprs[reg] += utask->vaddr - utask->xol_vaddr;
}
if (fixup & FIXUP_BRANCH_NOT_TAKEN) {
int ilen = insn_length(auprobe->insn[0] >> 8);
if (regs->psw.addr - utask->xol_vaddr == ilen)
regs->psw.addr = utask->vaddr + ilen;
}
if (check_per_event(current->thread.per_event.cause,
current->thread.per_user.control, regs)) {
/* fix per address */
current->thread.per_event.address = utask->vaddr;
/* trigger per event */
set_pt_regs_flag(regs, PIF_PER_TRAP);
}
return 0;
}
int arch_uprobe_exception_notify(struct notifier_block *self, unsigned long val,
void *data)
{
struct die_args *args = data;
struct pt_regs *regs = args->regs;
if (!user_mode(regs))
return NOTIFY_DONE;
if (regs->int_code & 0x200) /* Trap during transaction */
return NOTIFY_DONE;
switch (val) {
case DIE_BPT:
if (uprobe_pre_sstep_notifier(regs))
return NOTIFY_STOP;
break;
case DIE_SSTEP:
if (uprobe_post_sstep_notifier(regs))
return NOTIFY_STOP;
default:
break;
}
return NOTIFY_DONE;
}
void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
clear_thread_flag(TIF_UPROBE_SINGLESTEP);
regs->int_code = auprobe->saved_int_code;
regs->psw.addr = current->utask->vaddr;
current->thread.per_event.address = current->utask->vaddr;
}
unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline,
struct pt_regs *regs)
{
unsigned long orig;
orig = regs->gprs[14];
regs->gprs[14] = trampoline;
return orig;
}
/* Instruction Emulation */
static void adjust_psw_addr(psw_t *psw, unsigned long len)
{
psw->addr = __rewind_psw(*psw, -len);
}
#define EMU_ILLEGAL_OP 1
#define EMU_SPECIFICATION 2
#define EMU_ADDRESSING 3
#define emu_load_ril(ptr, output) \
({ \
unsigned int mask = sizeof(*(ptr)) - 1; \
__typeof__(*(ptr)) input; \
int __rc = 0; \
\
if (!test_facility(34)) \
__rc = EMU_ILLEGAL_OP; \
else if ((u64 __force)ptr & mask) \
__rc = EMU_SPECIFICATION; \
else if (get_user(input, ptr)) \
__rc = EMU_ADDRESSING; \
else \
*(output) = input; \
__rc; \
})
#define emu_store_ril(regs, ptr, input) \
({ \
unsigned int mask = sizeof(*(ptr)) - 1; \
__typeof__(ptr) __ptr = (ptr); \
int __rc = 0; \
\
if (!test_facility(34)) \
__rc = EMU_ILLEGAL_OP; \
else if ((u64 __force)__ptr & mask) \
__rc = EMU_SPECIFICATION; \
else if (put_user(*(input), __ptr)) \
__rc = EMU_ADDRESSING; \
if (__rc == 0) \
sim_stor_event(regs, \
(void __force *)__ptr, \
mask + 1); \
__rc; \
})
#define emu_cmp_ril(regs, ptr, cmp) \
({ \
unsigned int mask = sizeof(*(ptr)) - 1; \
__typeof__(*(ptr)) input; \
int __rc = 0; \
\
if (!test_facility(34)) \
__rc = EMU_ILLEGAL_OP; \
else if ((u64 __force)ptr & mask) \
__rc = EMU_SPECIFICATION; \
else if (get_user(input, ptr)) \
__rc = EMU_ADDRESSING; \
else if (input > *(cmp)) \
psw_bits((regs)->psw).cc = 1; \
else if (input < *(cmp)) \
psw_bits((regs)->psw).cc = 2; \
else \
psw_bits((regs)->psw).cc = 0; \
__rc; \
})
struct insn_ril {
u8 opc0;
u8 reg : 4;
u8 opc1 : 4;
s32 disp;
} __packed;
union split_register {
u64 u64;
u32 u32[2];
u16 u16[4];
s64 s64;
s32 s32[2];
s16 s16[4];
};
/*
* If user per registers are setup to trace storage alterations and an
* emulated store took place on a fitting address a user trap is generated.
*/
static void sim_stor_event(struct pt_regs *regs, void *addr, int len)
{
if (!(regs->psw.mask & PSW_MASK_PER))
return;
if (!(current->thread.per_user.control & PER_EVENT_STORE))
return;
if ((void *)current->thread.per_user.start > (addr + len))
return;
if ((void *)current->thread.per_user.end < addr)
return;
current->thread.per_event.address = regs->psw.addr;
current->thread.per_event.cause = PER_EVENT_STORE >> 16;
set_pt_regs_flag(regs, PIF_PER_TRAP);
}
/*
* pc relative instructions are emulated, since parameters may not be
* accessible from the xol area due to range limitations.
*/
static void handle_insn_ril(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
union split_register *rx;
struct insn_ril *insn;
unsigned int ilen;
void *uptr;
int rc = 0;
insn = (struct insn_ril *) &auprobe->insn;
rx = (union split_register *) &regs->gprs[insn->reg];
uptr = (void *)(regs->psw.addr + (insn->disp * 2));
ilen = insn_length(insn->opc0);
switch (insn->opc0) {
case 0xc0:
switch (insn->opc1) {
case 0x00: /* larl */
rx->u64 = (unsigned long)uptr;
break;
}
break;
case 0xc4:
switch (insn->opc1) {
case 0x02: /* llhrl */
rc = emu_load_ril((u16 __user *)uptr, &rx->u32[1]);
break;
case 0x04: /* lghrl */
rc = emu_load_ril((s16 __user *)uptr, &rx->u64);
break;
case 0x05: /* lhrl */
rc = emu_load_ril((s16 __user *)uptr, &rx->u32[1]);
break;
case 0x06: /* llghrl */
rc = emu_load_ril((u16 __user *)uptr, &rx->u64);
break;
case 0x08: /* lgrl */
rc = emu_load_ril((u64 __user *)uptr, &rx->u64);
break;
case 0x0c: /* lgfrl */
rc = emu_load_ril((s32 __user *)uptr, &rx->u64);
break;
case 0x0d: /* lrl */
rc = emu_load_ril((u32 __user *)uptr, &rx->u32[1]);
break;
case 0x0e: /* llgfrl */
rc = emu_load_ril((u32 __user *)uptr, &rx->u64);
break;
case 0x07: /* sthrl */
rc = emu_store_ril(regs, (u16 __user *)uptr, &rx->u16[3]);
break;
case 0x0b: /* stgrl */
rc = emu_store_ril(regs, (u64 __user *)uptr, &rx->u64);
break;
case 0x0f: /* strl */
rc = emu_store_ril(regs, (u32 __user *)uptr, &rx->u32[1]);
break;
}
break;
case 0xc6:
switch (insn->opc1) {
case 0x02: /* pfdrl */
if (!test_facility(34))
rc = EMU_ILLEGAL_OP;
break;
case 0x04: /* cghrl */
rc = emu_cmp_ril(regs, (s16 __user *)uptr, &rx->s64);
break;
case 0x05: /* chrl */
rc = emu_cmp_ril(regs, (s16 __user *)uptr, &rx->s32[1]);
break;
case 0x06: /* clghrl */
rc = emu_cmp_ril(regs, (u16 __user *)uptr, &rx->u64);
break;
case 0x07: /* clhrl */
rc = emu_cmp_ril(regs, (u16 __user *)uptr, &rx->u32[1]);
break;
case 0x08: /* cgrl */
rc = emu_cmp_ril(regs, (s64 __user *)uptr, &rx->s64);
break;
case 0x0a: /* clgrl */
rc = emu_cmp_ril(regs, (u64 __user *)uptr, &rx->u64);
break;
case 0x0c: /* cgfrl */
rc = emu_cmp_ril(regs, (s32 __user *)uptr, &rx->s64);
break;
case 0x0d: /* crl */
rc = emu_cmp_ril(regs, (s32 __user *)uptr, &rx->s32[1]);
break;
case 0x0e: /* clgfrl */
rc = emu_cmp_ril(regs, (u32 __user *)uptr, &rx->u64);
break;
case 0x0f: /* clrl */
rc = emu_cmp_ril(regs, (u32 __user *)uptr, &rx->u32[1]);
break;
}
break;
}
adjust_psw_addr(&regs->psw, ilen);
switch (rc) {
case EMU_ILLEGAL_OP:
regs->int_code = ilen << 16 | 0x0001;
do_report_trap(regs, SIGILL, ILL_ILLOPC, NULL);
break;
case EMU_SPECIFICATION:
regs->int_code = ilen << 16 | 0x0006;
do_report_trap(regs, SIGILL, ILL_ILLOPC , NULL);
break;
case EMU_ADDRESSING:
regs->int_code = ilen << 16 | 0x0005;
do_report_trap(regs, SIGSEGV, SEGV_MAPERR, NULL);
break;
}
}
bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
if ((psw_bits(regs->psw).eaba == PSW_BITS_AMODE_24BIT) ||
((psw_bits(regs->psw).eaba == PSW_BITS_AMODE_31BIT) &&
!is_compat_task())) {
regs->psw.addr = __rewind_psw(regs->psw, UPROBE_SWBP_INSN_SIZE);
do_report_trap(regs, SIGILL, ILL_ILLADR, NULL);
return true;
}
if (probe_is_insn_relative_long(auprobe->insn)) {
handle_insn_ril(auprobe, regs);
return true;
}
return false;
}
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