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authorKees Cook <keescook@chromium.org>2012-11-19 10:26:16 -0800
committerJohn Stultz <john.stultz@linaro.org>2013-01-15 18:16:02 -0800
commit1e817fb62cd185a2232ad4302579491805609489 (patch)
treed4155fb65a9fb32cd9236405a8b7534f39c293b9 /fs/pstore
parent9c3f9e281697d02889c3b08922f3b30be75f56c2 (diff)
downloadtalos-op-linux-1e817fb62cd185a2232ad4302579491805609489.tar.gz
talos-op-linux-1e817fb62cd185a2232ad4302579491805609489.zip
time: create __getnstimeofday for WARNless calls
The pstore RAM backend can get called during resume, and must be defensive against a suspended time source. Expose getnstimeofday logic that returns an error instead of a WARN. This can be detected and the timestamp can be zeroed out. Reported-by: Doug Anderson <dianders@chromium.org> Cc: John Stultz <johnstul@us.ibm.com> Cc: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'fs/pstore')
-rw-r--r--fs/pstore/ram.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 1a4f6da58eab..dacfe78aee7e 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -168,12 +168,16 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
{
char *hdr;
- struct timeval timestamp;
+ struct timespec timestamp;
size_t len;
- do_gettimeofday(&timestamp);
+ /* Report zeroed timestamp if called before timekeeping has resumed. */
+ if (__getnstimeofday(&timestamp)) {
+ timestamp.tv_sec = 0;
+ timestamp.tv_nsec = 0;
+ }
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu\n",
- (long)timestamp.tv_sec, (long)timestamp.tv_usec);
+ (long)timestamp.tv_sec, (long)(timestamp.tv_nsec / 1000));
WARN_ON_ONCE(!hdr);
len = hdr ? strlen(hdr) : 0;
persistent_ram_write(prz, hdr, len);
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