This is a note to let you know that I've just added the patch titled
efi-pstore: Fix an overflow on 32-bit builds
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
efi-pstore-fix-an-overflow-on-32-bit-builds.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 783ee43118dc773bc8b0342c5b230e017d5a04d0 Mon Sep 17 00:00:00 2001
From: Andrzej Zaborowski <andrew.zaborowski@xxxxxxxxx>
Date: Mon, 9 Jun 2014 16:50:40 +0200
Subject: efi-pstore: Fix an overflow on 32-bit builds
From: Andrzej Zaborowski <andrew.zaborowski@xxxxxxxxx>
commit 783ee43118dc773bc8b0342c5b230e017d5a04d0 upstream.
In generic_id the long int timestamp is multiplied by 100000 and needs
an explicit cast to u64.
Without that the id in the resulting pstore filename is wrong and
userspace may have problems parsing it, but more importantly files in
pstore can never be deleted and may fill the EFI flash (brick device?).
This happens because when generic pstore code wants to delete a file,
it passes the id to the EFI backend which reinterpretes it and a wrong
variable name is attempted to be deleted. There's no error message but
after remounting pstore, deleted files would reappear.
Signed-off-by: Andrew Zaborowski <andrew.zaborowski@xxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/efi/efi-pstore.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/firmware/efi/efi-pstore.c
+++ b/drivers/firmware/efi/efi-pstore.c
@@ -40,7 +40,7 @@ struct pstore_read_data {
static inline u64 generic_id(unsigned long timestamp,
unsigned int part, int count)
{
- return (timestamp * 100 + part) * 1000 + count;
+ return ((u64) timestamp * 100 + part) * 1000 + count;
}
static int efi_pstore_read_func(struct efivar_entry *entry, void *data)
Patches currently in stable-queue which might be from andrew.zaborowski@xxxxxxxxx are
queue-3.14/efi-pstore-fix-an-overflow-on-32-bit-builds.patch
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