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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-14 14:29:55 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-02-14 14:29:55 -0800
commitc21b04f9890ce35bfbb4f5ee1937017613f66017 (patch)
tree0f15558258d2d67f8149d3378b0e6bb83f0d8a35 /lib
parent28c09ec4b6b7a2f9f769966baf54eaf0d6fadf8c (diff)
parent18558cae0272f8fd9647e69d3fec1565a7949865 (diff)
Merge 4.5-rc4 into driver-core-next
We want the fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug15
-rw-r--r--lib/Kconfig.ubsan4
-rw-r--r--lib/klist.c6
-rw-r--r--lib/scatterlist.c6
-rw-r--r--lib/vsprintf.c26
5 files changed, 37 insertions, 20 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index ecb9e75614bf..8bfd1aca7a3d 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1400,6 +1400,21 @@ config RCU_EQS_DEBUG
endmenu # "RCU Debugging"
+config DEBUG_WQ_FORCE_RR_CPU
+ bool "Force round-robin CPU selection for unbound work items"
+ depends on DEBUG_KERNEL
+ default n
+ help
+ Workqueue used to implicitly guarantee that work items queued
+ without explicit CPU specified are put on the local CPU. This
+ guarantee is no longer true and while local CPU is still
+ preferred work items may be put on foreign CPUs. Kernel
+ parameter "workqueue.debug_force_rr_cpu" is added to force
+ round-robin CPU selection to flush out usages which depend on the
+ now broken guarantee. This config option enables the debug
+ feature by default. When enabled, memory and cache locality will
+ be impacted.
+
config DEBUG_BLOCK_EXT_DEVT
bool "Force extended block device numbers and spread them"
depends on DEBUG_KERNEL
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan
index 49518fb48cab..e07c1ba9ba13 100644
--- a/lib/Kconfig.ubsan
+++ b/lib/Kconfig.ubsan
@@ -18,6 +18,8 @@ config UBSAN_SANITIZE_ALL
This option activates instrumentation for the entire kernel.
If you don't enable this option, you have to explicitly specify
UBSAN_SANITIZE := y for the files/directories you want to check for UB.
+ Enabling this option will get kernel image size increased
+ significantly.
config UBSAN_ALIGNMENT
bool "Enable checking of pointers alignment"
@@ -25,5 +27,5 @@ config UBSAN_ALIGNMENT
default y if !HAVE_EFFICIENT_UNALIGNED_ACCESS
help
This option enables detection of unaligned memory accesses.
- Enabling this option on architectures that support unalligned
+ Enabling this option on architectures that support unaligned
accesses may produce a lot of false positives.
diff --git a/lib/klist.c b/lib/klist.c
index d74cf7a29afd..0507fa5d84c5 100644
--- a/lib/klist.c
+++ b/lib/klist.c
@@ -282,9 +282,9 @@ void klist_iter_init_node(struct klist *k, struct klist_iter *i,
struct klist_node *n)
{
i->i_klist = k;
- i->i_cur = n;
- if (n)
- kref_get(&n->n_ref);
+ i->i_cur = NULL;
+ if (n && kref_get_unless_zero(&n->n_ref))
+ i->i_cur = n;
}
EXPORT_SYMBOL_GPL(klist_iter_init_node);
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index bafa9933fa76..004fc70fc56a 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -598,9 +598,9 @@ EXPORT_SYMBOL(sg_miter_next);
*
* Description:
* Stops mapping iterator @miter. @miter should have been started
- * started using sg_miter_start(). A stopped iteration can be
- * resumed by calling sg_miter_next() on it. This is useful when
- * resources (kmap) need to be released during iteration.
+ * using sg_miter_start(). A stopped iteration can be resumed by
+ * calling sg_miter_next() on it. This is useful when resources (kmap)
+ * need to be released during iteration.
*
* Context:
* Preemption disabled if the SG_MITER_ATOMIC is set. Don't care
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 48ff9c36644d..f44e178e6ede 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1590,22 +1590,23 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return buf;
}
case 'K':
- /*
- * %pK cannot be used in IRQ context because its test
- * for CAP_SYSLOG would be meaningless.
- */
- if (kptr_restrict && (in_irq() || in_serving_softirq() ||
- in_nmi())) {
- if (spec.field_width == -1)
- spec.field_width = default_width;
- return string(buf, end, "pK-error", spec);
- }
-
switch (kptr_restrict) {
case 0:
/* Always print %pK values */
break;
case 1: {
+ const struct cred *cred;
+
+ /*
+ * kptr_restrict==1 cannot be used in IRQ context
+ * because its test for CAP_SYSLOG would be meaningless.
+ */
+ if (in_irq() || in_serving_softirq() || in_nmi()) {
+ if (spec.field_width == -1)
+ spec.field_width = default_width;
+ return string(buf, end, "pK-error", spec);
+ }
+
/*
* Only print the real pointer value if the current
* process has CAP_SYSLOG and is running with the
@@ -1615,8 +1616,7 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
* leak pointer values if a binary opens a file using
* %pK and then elevates privileges before reading it.
*/
- const struct cred *cred = current_cred();
-
+ cred = current_cred();
if (!has_capability_noaudit(current, CAP_SYSLOG) ||
!uid_eq(cred->euid, cred->uid) ||
!gid_eq(cred->egid, cred->gid))