On Wed, May 30, 2018 at 1:30 PM, Arnd Bergmann arnd@arndb.de wrote:
The pstore conversion to timespec64 introduces its own method of passing seconds into sscanf() and sprintf() type functions to work around the timespec64 definition on 64-bit systems that redefine it to 'timespec'.
That hack is now finally getting removed, but that means we get a (harmless) warning once both patches are merged:
fs/pstore/ram.c: In function 'ramoops_read_kmsg_hdr': fs/pstore/ram.c:39:29: error: format '%ld' expects argument of type 'long int *', but argument 3 has type 'time64_t *' {aka 'long long int *'} [-Werror=format=] #define RAMOOPS_KERNMSG_HDR "====" ^~~~~~ fs/pstore/ram.c:167:21: note: in expansion of macro 'RAMOOPS_KERNMSG_HDR'
This removes the pstore specific workaround and uses the same method that we have in place for all other functions that print a timespec64.
Related to this, I found that the kasprintf() output contains an incorrect nanosecond values for any number starting with zeroes, and I adapt the format string accordingly.
Link: https://lkml.org/lkml/2018/5/19/115 Link: https://lkml.org/lkml/2018/5/16/1080 Fixes: 0f0d83b99ef7 ("pstore: Convert internal records to timespec64") Signed-off-by: Arnd Bergmann arnd@arndb.de
Acked-by: Kees Cook keescook@chromium.org
Please feel free to carry this patch in which ever series/tree it is needed. :P
-Kees
fs/pstore/ram.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-)
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c index 69e893076ab7..bbd1e357c23d 100644 --- a/fs/pstore/ram.c +++ b/fs/pstore/ram.c @@ -38,11 +38,6 @@
#define RAMOOPS_KERNMSG_HDR "====" #define MIN_MEM_SIZE 4096UL -#if __BITS_PER_LONG == 64 -# define TVSEC_FMT "%ld" -#else -# define TVSEC_FMT "%lld" -#endif
static ulong record_size = MIN_MEM_SIZE; module_param(record_size, ulong, 0400); @@ -164,15 +159,15 @@ static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time, char data_type; int header_length = 0;
if (sscanf(buffer, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu-%c\n%n",&time->tv_sec, &time->tv_nsec, &data_type,
if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu-%c\n%n",(time64_t *)&time->tv_sec, &time->tv_nsec, &data_type, &header_length) == 3) { if (data_type == 'C') *compressed = true; else *compressed = false;
} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu\n%n",&time->tv_sec, &time->tv_nsec,
} else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lld.%lu\n%n",(time64_t *)&time->tv_sec, &time->tv_nsec, &header_length) == 2) { *compressed = false; } else {@@ -367,8 +362,8 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, char *hdr; size_t len;
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu-%c\n",record->time.tv_sec,
hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lld.%06lu-%c\n",(time64_t)record->time.tv_sec, record->time.tv_nsec / 1000, record->compressed ? 'C' : 'D'); WARN_ON_ONCE(!hdr);-- 2.9.0