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powerpc fixes for 5.12 #4 

Fix a possible stack corruption and subsequent DLPAR failure in the rpadlpar_io
 PCI hotplug driver.
 
 Two build fixes for uncommon configurations.
 
 Thanks to Christophe Leroy, Tyrel Datwyler.
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Merge tag 'powerpc-5.12-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:

 - Fix a possible stack corruption and subsequent DLPAR failure in the
   rpadlpar_io PCI hotplug driver

 - Two build fixes for uncommon configurations

Thanks to Christophe Leroy and Tyrel Datwyler.

* tag 'powerpc-5.12-4' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  PCI: rpadlpar: Fix potential drc_name corruption in store functions
  powerpc: Force inlining of cpu_has_feature() to avoid build failure
  powerpc/vdso32: Add missing _restgpr_31_x to fix build failure
This commit is contained in:
Linus Torvalds 2021-03-21 10:57:35 -07:00
parent 812da4d394 cc7a0bb058
commit b35660a7ce
3 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/powerpc/include/asm/cpu_has_feature.h
View File

@ -7,7 +7,7 @@
#include <linux/bug.h>
#include <asm/cputable.h>
static inline bool early_cpu_has_feature(unsigned long feature)
static __always_inline bool early_cpu_has_feature(unsigned long feature)
{
return !!((CPU_FTRS_ALWAYS & feature) ||
(CPU_FTRS_POSSIBLE & cur_cpu_spec->cpu_features & feature));
@ -46,7 +46,7 @@ static __always_inline bool cpu_has_feature(unsigned long feature)
return static_branch_likely(&cpu_feature_keys[i]);
}
#else
static inline bool cpu_has_feature(unsigned long feature)
static __always_inline bool cpu_has_feature(unsigned long feature)
{
return early_cpu_has_feature(feature);
}

11
arch/powerpc/kernel/vdso32/gettimeofday.S
View File

@ -65,3 +65,14 @@ V_FUNCTION_END(__kernel_clock_getres)
V_FUNCTION_BEGIN(__kernel_time)
cvdso_call_time __c_kernel_time
V_FUNCTION_END(__kernel_time)
/* Routines for restoring integer registers, called by the compiler. */
/* Called with r11 pointing to the stack header word of the caller of the */
/* function, just beyond the end of the integer restore area. */
_GLOBAL(_restgpr_31_x)
_GLOBAL(_rest32gpr_31_x)
lwz r0,4(r11)
lwz r31,-4(r11)
mtlr r0
mr r1,r11
blr

14
drivers/pci/hotplug/rpadlpar_sysfs.c
View File

@ -34,12 +34,11 @@ static ssize_t add_slot_store(struct kobject *kobj, struct kobj_attribute *attr,
if (nbytes >= MAX_DRC_NAME_LEN)
return 0;
memcpy(drc_name, buf, nbytes);
strscpy(drc_name, buf, nbytes + 1);
end = strchr(drc_name, '\n');
if (!end)
end = &drc_name[nbytes];
*end = '\0';
if (end)
*end = '\0';
rc = dlpar_add_slot(drc_name);
if (rc)
@ -65,12 +64,11 @@ static ssize_t remove_slot_store(struct kobject *kobj,
if (nbytes >= MAX_DRC_NAME_LEN)
return 0;
memcpy(drc_name, buf, nbytes);
strscpy(drc_name, buf, nbytes + 1);
end = strchr(drc_name, '\n');
if (!end)
end = &drc_name[nbytes];
*end = '\0';
if (end)
*end = '\0';
rc = dlpar_remove_slot(drc_name);
if (rc)