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Char/Misc fixes for 5.5-rc7

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Here are some small fixes for 5.5-rc7
 
 Included here are:
 	- two lkdtm fixes
 	- coresight build fix
 	- Documentation update for the hw process document
 
 All of these have been in linux-next with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-5.5-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc fixes from Greg KH:
 "Here are some small fixes for 5.5-rc7

  Included here are:

   -  two lkdtm fixes

   -  coresight build fix

   -  Documentation update for the hw process document

  All of these have been in linux-next with no reported issues"

* tag 'char-misc-5.5-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc:
  Documentation/process: Add Amazon contact for embargoed hardware issues
  lkdtm/bugs: fix build error in lkdtm_UNSET_SMEP
  lkdtm/bugs: Make double-fault test always available
  coresight: etm4x: Fix unused function warning
This commit is contained in:
Linus Torvalds 2020-01-18 12:08:57 -08:00
commit f04dba64d6
3 changed files with 14 additions and 13 deletions
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2
Documentation/process/embargoed-hardware-issues.rst
View File

@ -255,7 +255,7 @@ an involved disclosed party. The current ambassadors list:
Red Hat Josh Poimboeuf <jpoimboe@redhat.com> Red Hat Josh Poimboeuf <jpoimboe@redhat.com>
SUSE Jiri Kosina <jkosina@suse.cz> SUSE Jiri Kosina <jkosina@suse.cz>
Amazon Amazon Peter Bowen <pzb@amzn.com>
Google Kees Cook <keescook@chromium.org> Google Kees Cook <keescook@chromium.org>
============= ======================================================== ============= ========================================================

9
drivers/hwtracing/coresight/coresight-etm4x.c
View File

@ -1132,7 +1132,6 @@ static void etm4_init_trace_id(struct etmv4_drvdata *drvdata)
drvdata->trcid = coresight_get_trace_id(drvdata->cpu); drvdata->trcid = coresight_get_trace_id(drvdata->cpu);
} }
#ifdef CONFIG_CPU_PM
static int etm4_cpu_save(struct etmv4_drvdata *drvdata) static int etm4_cpu_save(struct etmv4_drvdata *drvdata)
{ {
int i, ret = 0; int i, ret = 0;
@ -1402,17 +1401,17 @@ static struct notifier_block etm4_cpu_pm_nb = {
static int etm4_cpu_pm_register(void) static int etm4_cpu_pm_register(void)
{ {
if (IS_ENABLED(CONFIG_CPU_PM))
return cpu_pm_register_notifier(&etm4_cpu_pm_nb); return cpu_pm_register_notifier(&etm4_cpu_pm_nb);
return 0;
} }
static void etm4_cpu_pm_unregister(void) static void etm4_cpu_pm_unregister(void)
{ {
if (IS_ENABLED(CONFIG_CPU_PM))
cpu_pm_unregister_notifier(&etm4_cpu_pm_nb); cpu_pm_unregister_notifier(&etm4_cpu_pm_nb);
} }
#else
static int etm4_cpu_pm_register(void) { return 0; }
static void etm4_cpu_pm_unregister(void) { }
#endif
static int etm4_probe(struct amba_device *adev, const struct amba_id *id) static int etm4_probe(struct amba_device *adev, const struct amba_id *id)
{ {

12
drivers/misc/lkdtm/bugs.c
View File

@ -278,7 +278,7 @@ void lkdtm_STACK_GUARD_PAGE_TRAILING(void)
void lkdtm_UNSET_SMEP(void) void lkdtm_UNSET_SMEP(void)
{ {
#ifdef CONFIG_X86_64 #if IS_ENABLED(CONFIG_X86_64) && !IS_ENABLED(CONFIG_UML)
#define MOV_CR4_DEPTH 64 #define MOV_CR4_DEPTH 64
void (*direct_write_cr4)(unsigned long val); void (*direct_write_cr4)(unsigned long val);
unsigned char *insn; unsigned char *insn;
@ -338,13 +338,13 @@ void lkdtm_UNSET_SMEP(void)
native_write_cr4(cr4); native_write_cr4(cr4);
} }
#else #else
pr_err("FAIL: this test is x86_64-only\n"); pr_err("XFAIL: this test is x86_64-only\n");
#endif #endif
} }
#ifdef CONFIG_X86_32
void lkdtm_DOUBLE_FAULT(void) void lkdtm_DOUBLE_FAULT(void)
{ {
#ifdef CONFIG_X86_32
/* /*
* Trigger #DF by setting the stack limit to zero. This clobbers * Trigger #DF by setting the stack limit to zero. This clobbers
* a GDT TLS slot, which is okay because the current task will die * a GDT TLS slot, which is okay because the current task will die
@ -373,6 +373,8 @@ void lkdtm_DOUBLE_FAULT(void)
asm volatile ("movw %0, %%ss; addl $0, (%%esp)" :: asm volatile ("movw %0, %%ss; addl $0, (%%esp)" ::
"r" ((unsigned short)(GDT_ENTRY_TLS_MIN << 3))); "r" ((unsigned short)(GDT_ENTRY_TLS_MIN << 3)));
panic("tried to double fault but didn't die\n"); pr_err("FAIL: tried to double fault but didn't die\n");
} #else
pr_err("XFAIL: this test is ia32-only\n");
#endif #endif
}