From: "Joel Fernandes (Google)" <joel@joelfernandes.org>
To: linux-kernel@vger.kernel.org
Cc: kernel-team@android.com,
"Joel Fernandes (Google)" <joel@joelfernandes.org>,
Anton Vorontsov <anton@enomsg.org>,
Colin Cross <ccross@android.com>,
Kees Cook <keescook@chromium.org>,
Tony Luck <tony.luck@intel.com>
Subject: [RFC 5/6] pstore: donot treat empty buffers as valid
Date: Fri, 26 Oct 2018 11:00:41 -0700 [thread overview]
Message-ID: <20181026180042.52199-5-joel@joelfernandes.org> (raw)
In-Reply-To: <20181026180042.52199-1-joel@joelfernandes.org>
pstore currently calls persistent_ram_save_old even if a buffer is
empty. While this appears to work, it is simply not the right thing to
do and could lead to bugs so lets avoid that. It also prevent misleading
prints in the logs which claim the buffer is valid.
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
---
fs/pstore/ram_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 0792595ebcfb..1299aa3ea734 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -495,7 +495,7 @@ static int persistent_ram_post_init(struct persistent_ram_zone *prz, u32 sig,
sig ^= PERSISTENT_RAM_SIG;
- if (prz->buffer->sig == sig) {
+ if (prz->buffer->sig == sig && buffer_size(prz)) {
if (buffer_size(prz) > prz->buffer_size ||
buffer_start(prz) > buffer_size(prz))
pr_info("found existing invalid buffer, size %zu, start %zu\n",
--
2.19.1.568.g152ad8e336-goog
next prev parent reply other threads:[~2018-10-26 18:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-26 18:00 [RFC 1/6] pstore: map pstore types to names Joel Fernandes (Google)
2018-10-26 18:00 ` [RFC 2/6] pstore: remove type argument from ramoops_get_next_prz Joel Fernandes (Google)
2018-10-26 19:05 ` Kees Cook
2018-10-26 18:00 ` [RFC 3/6] pstore: remove max " Joel Fernandes (Google)
2018-10-26 19:22 ` Joel Fernandes
2018-10-26 19:27 ` Kees Cook
2018-10-26 19:40 ` Joel Fernandes
2018-10-26 19:22 ` Kees Cook
2018-10-26 18:00 ` [RFC 4/6] pstore: further reduce ramoops_get_next_prz arguments by passing record Joel Fernandes (Google)
2018-10-26 19:32 ` Kees Cook
2018-10-26 19:36 ` Joel Fernandes
2018-10-26 18:00 ` Joel Fernandes (Google) [this message]
2018-10-26 19:39 ` [RFC 5/6] pstore: donot treat empty buffers as valid Kees Cook
2018-10-26 20:22 ` Joel Fernandes
2018-10-26 18:00 ` [RFC 6/6] Revert "pstore/ram_core: Do not reset restored zone's position and size" Joel Fernandes (Google)
2018-10-26 18:16 ` Kees Cook
2018-10-26 18:22 ` Joel Fernandes
2018-10-26 19:42 ` Kees Cook
2018-10-26 20:09 ` Joel Fernandes
2018-10-26 19:04 ` [RFC 1/6] pstore: map pstore types to names Kees Cook
2018-10-26 20:35 ` Joel Fernandes
2018-10-26 20:41 ` Kees Cook
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