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| author |   Sami Tolvanen <samitolvanen@google.com> | 2020-04-27 09:00:08 -0700 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2020-05-15 16:35:49 +0100 |
| commit | 628d06a48f57c36abdc2a024930212e654a501b7 (patch) | |
| tree | de784916db6c4bc3c63a99efc825e0726dd4b930 /kernel/scs.c | |
| parent | scs: Add support for Clang's Shadow Call Stack (SCS) (diff) | |
| download | linux-dev-628d06a48f57c36abdc2a024930212e654a501b7.tar.xz linux-dev-628d06a48f57c36abdc2a024930212e654a501b7.zip | |
scs: Add page accounting for shadow call stack allocations
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>
Diffstat (limited to 'kernel/scs.c')
| -rw-r--r-- | kernel/scs.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/scs.c b/kernel/scs.c index 38f8f31c9451..6d2f983ac54e 100644 --- a/kernel/scs.c +++ b/kernel/scs.c @@ -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); } |