Otherwise, unlinked file will reappear on the next boot.
Reported-by: Kees Cook <[email protected]>
Signed-off-by: Anton Vorontsov <[email protected]>
---
fs/pstore/ram.c | 1 +
fs/pstore/ram_core.c | 6 ++++++
include/linux/pstore_ram.h | 1 +
3 files changed, 8 insertions(+)
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 3a7724b..43d9727 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -186,6 +186,7 @@ static int ramoops_pstore_erase(enum pstore_type_id type,
u64 id,
return -EINVAL;
persistent_ram_free_old(cxt->przs[id]);
+ persistent_ram_zap(cxt->przs[id]);
return 0;
}
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index dff5127..28b6d7f 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -336,6 +336,12 @@ void persistent_ram_free_old(struct persistent_ram_zone
*prz)
prz->old_log_size = 0;
}
+void persistent_ram_zap(struct persistent_ram_zone *prz)
+{
+ atomic_set(&prz->buffer->size, 0);
+ persistent_ram_update_header_ecc(prz);
+}
+
static void *persistent_ram_vmap(phys_addr_t start, size_t size)
{
struct page **pages;
diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index 07d59b7..085199e 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -69,6 +69,7 @@ struct persistent_ram_zone * __init
persistent_ram_new(phys_addr_t start,
size_t size,
bool ecc);
void persistent_ram_free(struct persistent_ram_zone *prz);
+void persistent_ram_zap(struct persistent_ram_zone *prz);
struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
bool ecc);
--
1.7.9.2
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