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Date: Wed, 10 May 2017 13:36:37 -0400
From: Daniel Micay <danielmicay@...il.com>
To: Tejun Heo <tj@...nel.org>,
Christoph Lameter <cl@...ux.com>
Cc: Kees Cook <keescook@...omium.org>,
kernel-hardening@...ts.openwall.com,
Daniel Micay <danielmicay@...il.com>
Subject: [PATCH] mark most percpu globals as __ro_after_init
Moving pcpu_base_addr to this section comes from PaX where it's part of
KERNEXEC. This extends it to the rest of the globals only written by the
init code.
Signed-off-by: Daniel Micay <danielmicay@...il.com>
---
mm/percpu.c | 36 ++++++++++++++++++------------------
1 file changed, 18 insertions(+), 18 deletions(-)
diff --git a/mm/percpu.c b/mm/percpu.c
index e0aa8ae7bde7..c03753054099 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -121,35 +121,35 @@ struct pcpu_chunk {
unsigned long populated[]; /* populated bitmap */
};
-static int pcpu_unit_pages __read_mostly;
-static int pcpu_unit_size __read_mostly;
-static int pcpu_nr_units __read_mostly;
-static int pcpu_atom_size __read_mostly;
-static int pcpu_nr_slots __read_mostly;
-static size_t pcpu_chunk_struct_size __read_mostly;
+static int pcpu_unit_pages __ro_after_init;
+static int pcpu_unit_size __ro_after_init;
+static int pcpu_nr_units __ro_after_init;
+static int pcpu_atom_size __ro_after_init;
+static int pcpu_nr_slots __ro_after_init;
+static size_t pcpu_chunk_struct_size __ro_after_init;
/* cpus with the lowest and highest unit addresses */
-static unsigned int pcpu_low_unit_cpu __read_mostly;
-static unsigned int pcpu_high_unit_cpu __read_mostly;
+static unsigned int pcpu_low_unit_cpu __ro_after_init;
+static unsigned int pcpu_high_unit_cpu __ro_after_init;
/* the address of the first chunk which starts with the kernel static area */
-void *pcpu_base_addr __read_mostly;
+void *pcpu_base_addr __ro_after_init;
EXPORT_SYMBOL_GPL(pcpu_base_addr);
-static const int *pcpu_unit_map __read_mostly; /* cpu -> unit */
-const unsigned long *pcpu_unit_offsets __read_mostly; /* cpu -> unit offset */
+static const int *pcpu_unit_map __ro_after_init; /* cpu -> unit */
+const unsigned long *pcpu_unit_offsets __ro_after_init; /* cpu -> unit offset */
/* group information, used for vm allocation */
-static int pcpu_nr_groups __read_mostly;
-static const unsigned long *pcpu_group_offsets __read_mostly;
-static const size_t *pcpu_group_sizes __read_mostly;
+static int pcpu_nr_groups __ro_after_init;
+static const unsigned long *pcpu_group_offsets __ro_after_init;
+static const size_t *pcpu_group_sizes __ro_after_init;
/*
* The first chunk which always exists. Note that unlike other
* chunks, this one can be allocated and mapped in several different
* ways and thus often doesn't live in the vmalloc area.
*/
-static struct pcpu_chunk *pcpu_first_chunk;
+static struct pcpu_chunk *pcpu_first_chunk __ro_after_init;
/*
* Optional reserved chunk. This chunk reserves part of the first
@@ -158,13 +158,13 @@ static struct pcpu_chunk *pcpu_first_chunk;
* area doesn't exist, the following variables contain NULL and 0
* respectively.
*/
-static struct pcpu_chunk *pcpu_reserved_chunk;
-static int pcpu_reserved_chunk_limit;
+static struct pcpu_chunk *pcpu_reserved_chunk __ro_after_init;
+static int pcpu_reserved_chunk_limit __ro_after_init;
static DEFINE_SPINLOCK(pcpu_lock); /* all internal data structures */
static DEFINE_MUTEX(pcpu_alloc_mutex); /* chunk create/destroy, [de]pop, map ext */
-static struct list_head *pcpu_slot __read_mostly; /* chunk list slots */
+static struct list_head *pcpu_slot __ro_after_init; /* chunk list slots */
/* chunks which need their map areas extended, protected by pcpu_lock */
static LIST_HEAD(pcpu_map_extend_chunks);
--
2.12.2
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