diff options
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/livepatch/livepatch-shadow-fix1.c | 18 | ||||
| -rw-r--r-- | samples/livepatch/livepatch-shadow-fix2.c | 6 |
2 files changed, 19 insertions, 5 deletions
diff --git a/samples/livepatch/livepatch-shadow-fix1.c b/samples/livepatch/livepatch-shadow-fix1.c index 830c55514f9f..04151c7f2631 100644 --- a/samples/livepatch/livepatch-shadow-fix1.c +++ b/samples/livepatch/livepatch-shadow-fix1.c @@ -56,6 +56,21 @@ struct dummy { unsigned long jiffies_expire; }; +/* + * The constructor makes more sense together with klp_shadow_get_or_alloc(). + * In this example, it would be safe to assign the pointer also to the shadow + * variable returned by klp_shadow_alloc(). But we wanted to show the more + * complicated use of the API. + */ +static int shadow_leak_ctor(void *obj, void *shadow_data, void *ctor_data) +{ + void **shadow_leak = shadow_data; + void *leak = ctor_data; + + *shadow_leak = leak; + return 0; +} + struct dummy *livepatch_fix1_dummy_alloc(void) { struct dummy *d; @@ -74,7 +89,8 @@ struct dummy *livepatch_fix1_dummy_alloc(void) * pointer to handle resource release. */ leak = kzalloc(sizeof(int), GFP_KERNEL); - klp_shadow_alloc(d, SV_LEAK, &leak, sizeof(leak), GFP_KERNEL); + klp_shadow_alloc(d, SV_LEAK, sizeof(leak), GFP_KERNEL, + shadow_leak_ctor, leak); pr_info("%s: dummy @ %p, expires @ %lx\n", __func__, d, d->jiffies_expire); diff --git a/samples/livepatch/livepatch-shadow-fix2.c b/samples/livepatch/livepatch-shadow-fix2.c index ff9948f0ec00..d6c62844dc15 100644 --- a/samples/livepatch/livepatch-shadow-fix2.c +++ b/samples/livepatch/livepatch-shadow-fix2.c @@ -53,17 +53,15 @@ struct dummy { bool livepatch_fix2_dummy_check(struct dummy *d, unsigned long jiffies) { int *shadow_count; - int count; /* * Patch: handle in-flight dummy structures, if they do not * already have a SV_COUNTER shadow variable, then attach a * new one. */ - count = 0; shadow_count = klp_shadow_get_or_alloc(d, SV_COUNTER, - &count, sizeof(count), - GFP_NOWAIT); + sizeof(*shadow_count), GFP_NOWAIT, + NULL, NULL); if (shadow_count) *shadow_count += 1; |