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pstore fix:

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- Fix corrupted compression due to unlucky size choice with ECC
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 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'pstore-v4.20-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore fix from Kees Cook:
 "Fix corrupted compression due to unlucky size choice with ECC"

* tag 'pstore-v4.20-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore/ram: Correctly calculate usable PRZ bytes
This commit is contained in:
Linus Torvalds 2018-11-30 09:03:15 -08:00
commit e9eaf72e73
2 changed files with 10 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
fs/pstore/ram.c
View File

@ -816,17 +816,14 @@ static int ramoops_probe(struct platform_device *pdev)
cxt->pstore.data = cxt;
/*
* Console can handle any buffer size, so prefer LOG_LINE_MAX. If we
* have to handle dumps, we must have at least record_size buffer. And
* for ftrace, bufsize is irrelevant (if bufsize is 0, buf will be
* ZERO_SIZE_PTR).
* Since bufsize is only used for dmesg crash dumps, it
* must match the size of the dprz record (after PRZ header
* and ECC bytes have been accounted for).
*/
if (cxt->console_size)
cxt->pstore.bufsize = 1024; /* LOG_LINE_MAX */
cxt->pstore.bufsize = max(cxt->record_size, cxt->pstore.bufsize);
cxt->pstore.buf = kmalloc(cxt->pstore.bufsize, GFP_KERNEL);
cxt->pstore.bufsize = cxt->dprzs[0]->buffer_size;
cxt->pstore.buf = kzalloc(cxt->pstore.bufsize, GFP_KERNEL);
if (!cxt->pstore.buf) {
pr_err("cannot allocate pstore buffer\n");
pr_err("cannot allocate pstore crash dump buffer\n");
err = -ENOMEM;
goto fail_clear;
}

5
include/linux/pstore.h
View File

@ -90,7 +90,10 @@ struct pstore_record {
*
* @buf_lock: spinlock to serialize access to @buf
* @buf: preallocated crash dump buffer
* @bufsize: size of @buf available for crash dump writes
* @bufsize: size of @buf available for crash dump bytes (must match
* smallest number of bytes available for writing to a
* backend entry, since compressed bytes don't take kindly
* to being truncated)
*
* @read_mutex: serializes @open, @read, @close, and @erase callbacks
* @flags: bitfield of frontends the backend can accept writes for