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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@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Daniel Micay 2017-05-10 13:36:37 -04:00 committed by Tejun Heo
parent 56868a460b
commit 1328710b8e
1 changed files with 18 additions and 18 deletions
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36
mm/percpu.c
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@ -121,35 +121,35 @@ struct pcpu_chunk {
unsigned long populated[]; /* populated bitmap */ unsigned long populated[]; /* populated bitmap */
}; };
static int pcpu_unit_pages __read_mostly; static int pcpu_unit_pages __ro_after_init;
static int pcpu_unit_size __read_mostly; static int pcpu_unit_size __ro_after_init;
static int pcpu_nr_units __read_mostly; static int pcpu_nr_units __ro_after_init;
static int pcpu_atom_size __read_mostly; static int pcpu_atom_size __ro_after_init;
static int pcpu_nr_slots __read_mostly; static int pcpu_nr_slots __ro_after_init;
static size_t pcpu_chunk_struct_size __read_mostly; static size_t pcpu_chunk_struct_size __ro_after_init;
/* cpus with the lowest and highest unit addresses */ /* cpus with the lowest and highest unit addresses */
static unsigned int pcpu_low_unit_cpu __read_mostly; static unsigned int pcpu_low_unit_cpu __ro_after_init;
static unsigned int pcpu_high_unit_cpu __read_mostly; static unsigned int pcpu_high_unit_cpu __ro_after_init;
/* the address of the first chunk which starts with the kernel static area */ /* 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); EXPORT_SYMBOL_GPL(pcpu_base_addr);
static const int *pcpu_unit_map __read_mostly; /* cpu -> unit */ static const int *pcpu_unit_map __ro_after_init; /* cpu -> unit */
const unsigned long *pcpu_unit_offsets __read_mostly; /* cpu -> unit offset */ const unsigned long *pcpu_unit_offsets __ro_after_init; /* cpu -> unit offset */
/* group information, used for vm allocation */ /* group information, used for vm allocation */
static int pcpu_nr_groups __read_mostly; static int pcpu_nr_groups __ro_after_init;
static const unsigned long *pcpu_group_offsets __read_mostly; static const unsigned long *pcpu_group_offsets __ro_after_init;
static const size_t *pcpu_group_sizes __read_mostly; static const size_t *pcpu_group_sizes __ro_after_init;
/* /*
* The first chunk which always exists. Note that unlike other * The first chunk which always exists. Note that unlike other
* chunks, this one can be allocated and mapped in several different * chunks, this one can be allocated and mapped in several different
* ways and thus often doesn't live in the vmalloc area. * 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 * 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 * area doesn't exist, the following variables contain NULL and 0
* respectively. * respectively.
*/ */
static struct pcpu_chunk *pcpu_reserved_chunk; static struct pcpu_chunk *pcpu_reserved_chunk __ro_after_init;
static int pcpu_reserved_chunk_limit; static int pcpu_reserved_chunk_limit __ro_after_init;
static DEFINE_SPINLOCK(pcpu_lock); /* all internal data structures */ static DEFINE_SPINLOCK(pcpu_lock); /* all internal data structures */
static DEFINE_MUTEX(pcpu_alloc_mutex); /* chunk create/destroy, [de]pop, map ext */ 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 */ /* chunks which need their map areas extended, protected by pcpu_lock */
static LIST_HEAD(pcpu_map_extend_chunks); static LIST_HEAD(pcpu_map_extend_chunks);