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scs: Add page accounting for shadow call stack allocations

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This change adds accounting for the memory allocated for shadow stacks.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Sami Tolvanen 2020-04-27 09:00:08 -07:00 committed by Will Deacon
parent d08b9f0ca6
commit 628d06a48f
6 changed files with 37 additions and 0 deletions
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6
drivers/base/node.c
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@ -415,6 +415,9 @@ static ssize_t node_read_meminfo(struct device *dev,
"Node %d AnonPages: %8lu kB\n"
"Node %d Shmem: %8lu kB\n"
"Node %d KernelStack: %8lu kB\n"
#ifdef CONFIG_SHADOW_CALL_STACK
"Node %d ShadowCallStack:%8lu kB\n"
#endif
"Node %d PageTables: %8lu kB\n"
"Node %d NFS_Unstable: %8lu kB\n"
"Node %d Bounce: %8lu kB\n"
@ -438,6 +441,9 @@ static ssize_t node_read_meminfo(struct device *dev,
nid, K(node_page_state(pgdat, NR_ANON_MAPPED)),
nid, K(i.sharedram),
nid, sum_zone_node_page_state(nid, NR_KERNEL_STACK_KB),
#ifdef CONFIG_SHADOW_CALL_STACK
nid, sum_zone_node_page_state(nid, NR_KERNEL_SCS_KB),
#endif
nid, K(sum_zone_node_page_state(nid, NR_PAGETABLE)),
nid, K(node_page_state(pgdat, NR_UNSTABLE_NFS)),
nid, K(sum_zone_node_page_state(nid, NR_BOUNCE)),

4
fs/proc/meminfo.c
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@ -103,6 +103,10 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
show_val_kb(m, "SUnreclaim: ", sunreclaim);
seq_printf(m, "KernelStack: %8lu kB\n",
global_zone_page_state(NR_KERNEL_STACK_KB));
#ifdef CONFIG_SHADOW_CALL_STACK
seq_printf(m, "ShadowCallStack:%8lu kB\n",
global_zone_page_state(NR_KERNEL_SCS_KB));
#endif
show_val_kb(m, "PageTables: ",
global_zone_page_state(NR_PAGETABLE));

3
include/linux/mmzone.h
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@ -156,6 +156,9 @@ enum zone_stat_item {
NR_MLOCK, /* mlock()ed pages found and moved off LRU */
NR_PAGETABLE, /* used for pagetables */
NR_KERNEL_STACK_KB, /* measured in KiB */
#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
NR_KERNEL_SCS_KB, /* measured in KiB */
#endif
/* Second 128 byte cacheline */
NR_BOUNCE,
#if IS_ENABLED(CONFIG_ZSMALLOC)

15
kernel/scs.c
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@ -6,8 +6,10 @@
*/
#include <linux/kasan.h>
#include <linux/mm.h>
#include <linux/scs.h>
#include <linux/slab.h>
#include <linux/vmstat.h>
#include <asm/scs.h>
static struct kmem_cache *scs_cache;
@ -40,6 +42,17 @@ void __init scs_init(void)
scs_cache = kmem_cache_create("scs_cache", SCS_SIZE, 0, 0, NULL);
}
static struct page *__scs_page(struct task_struct *tsk)
{
return virt_to_page(task_scs(tsk));
}
static void scs_account(struct task_struct *tsk, int account)
{
mod_zone_page_state(page_zone(__scs_page(tsk)), NR_KERNEL_SCS_KB,
account * (SCS_SIZE / 1024));
}
int scs_prepare(struct task_struct *tsk, int node)
{
void *s = scs_alloc(node);
@ -49,6 +62,7 @@ int scs_prepare(struct task_struct *tsk, int node)
task_scs(tsk) = s;
task_scs_offset(tsk) = 0;
scs_account(tsk, 1);
return 0;
}
@ -61,5 +75,6 @@ void scs_release(struct task_struct *tsk)
return;
WARN(scs_corrupted(tsk), "corrupted shadow stack detected when freeing task\n");
scs_account(tsk, -1);
scs_free(s);
}

6
mm/page_alloc.c
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@ -5411,6 +5411,9 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
" managed:%lukB"
" mlocked:%lukB"
" kernel_stack:%lukB"
#ifdef CONFIG_SHADOW_CALL_STACK
" shadow_call_stack:%lukB"
#endif
" pagetables:%lukB"
" bounce:%lukB"
" free_pcp:%lukB"
@ -5433,6 +5436,9 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
K(zone_managed_pages(zone)),
K(zone_page_state(zone, NR_MLOCK)),
zone_page_state(zone, NR_KERNEL_STACK_KB),
#ifdef CONFIG_SHADOW_CALL_STACK
zone_page_state(zone, NR_KERNEL_SCS_KB),
#endif
K(zone_page_state(zone, NR_PAGETABLE)),
K(zone_page_state(zone, NR_BOUNCE)),
K(free_pcp),

3
mm/vmstat.c
View File

@ -1119,6 +1119,9 @@ const char * const vmstat_text[] = {
"nr_mlock",
"nr_page_table_pages",
"nr_kernel_stack",
#if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
"nr_shadow_call_stack",
#endif
"nr_bounce",
#if IS_ENABLED(CONFIG_ZSMALLOC)
"nr_zspages",