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Date: Tue, 15 May 2018 10:42:52 -0700
From: Deepa Dinamani <deepa.kernel@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Anton Vorontsov <anton@...msg.org>,
Colin Cross <ccross@...roid.com>,
Tony Luck <tony.luck@...el.com>
Subject: Re: [PATCH v2] pstore: Convert internal records to timespec64
Acked-by: Deepa Dinamani <deepa.kernel@...il.com>
I think for 4.18, I can include it as part of my series.
Thanks,
-Deepa
On Mon, May 14, 2018 at 3:50 PM, Kees Cook <keescook@...omium.org> wrote:
> This prepares pstore for converting the VFS layer to timespec64.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
> I can carry this for v4.18 unless you'd like to do it as part of your series?
> ---
> drivers/firmware/efi/efi-pstore.c | 27 ++++++++++++++-------------
> fs/pstore/inode.c | 3 ++-
> fs/pstore/platform.c | 2 +-
> fs/pstore/ram.c | 21 ++++++++++++++-------
> include/linux/pstore.h | 2 +-
> 5 files changed, 32 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/firmware/efi/efi-pstore.c b/drivers/firmware/efi/efi-pstore.c
> index 5a0fa939d70f..cfe87b465819 100644
> --- a/drivers/firmware/efi/efi-pstore.c
> +++ b/drivers/firmware/efi/efi-pstore.c
> @@ -28,10 +28,9 @@ static int efi_pstore_close(struct pstore_info *psi)
> return 0;
> }
>
> -static inline u64 generic_id(unsigned long timestamp,
> - unsigned int part, int count)
> +static inline u64 generic_id(u64 timestamp, unsigned int part, int count)
> {
> - return ((u64) timestamp * 100 + part) * 1000 + count;
> + return (timestamp * 100 + part) * 1000 + count;
> }
>
> static int efi_pstore_read_func(struct efivar_entry *entry,
> @@ -42,7 +41,8 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
> int i;
> int cnt;
> unsigned int part;
> - unsigned long time, size;
> + unsigned long size;
> + u64 time;
>
> if (efi_guidcmp(entry->var.VendorGuid, vendor))
> return 0;
> @@ -50,7 +50,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
> for (i = 0; i < DUMP_NAME_LEN; i++)
> name[i] = entry->var.VariableName[i];
>
> - if (sscanf(name, "dump-type%u-%u-%d-%lu-%c",
> + if (sscanf(name, "dump-type%u-%u-%d-%llu-%c",
> &record->type, &part, &cnt, &time, &data_type) == 5) {
> record->id = generic_id(time, part, cnt);
> record->part = part;
> @@ -62,7 +62,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
> else
> record->compressed = false;
> record->ecc_notice_size = 0;
> - } else if (sscanf(name, "dump-type%u-%u-%d-%lu",
> + } else if (sscanf(name, "dump-type%u-%u-%d-%llu",
> &record->type, &part, &cnt, &time) == 4) {
> record->id = generic_id(time, part, cnt);
> record->part = part;
> @@ -71,7 +71,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry,
> record->time.tv_nsec = 0;
> record->compressed = false;
> record->ecc_notice_size = 0;
> - } else if (sscanf(name, "dump-type%u-%u-%lu",
> + } else if (sscanf(name, "dump-type%u-%u-%llu",
> &record->type, &part, &time) == 3) {
> /*
> * Check if an old format,
> @@ -250,9 +250,10 @@ static int efi_pstore_write(struct pstore_record *record)
> /* Since we copy the entire length of name, make sure it is wiped. */
> memset(name, 0, sizeof(name));
>
> - snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu-%c",
> + snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld-%c",
> record->type, record->part, record->count,
> - record->time.tv_sec, record->compressed ? 'C' : 'D');
> + (long long)record->time.tv_sec,
> + record->compressed ? 'C' : 'D');
>
> for (i = 0; i < DUMP_NAME_LEN; i++)
> efi_name[i] = name[i];
> @@ -327,15 +328,15 @@ static int efi_pstore_erase(struct pstore_record *record)
> char name[DUMP_NAME_LEN];
> int ret;
>
> - snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu",
> + snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lld",
> record->type, record->part, record->count,
> - record->time.tv_sec);
> + (long long)record->time.tv_sec);
> ret = efi_pstore_erase_name(name);
> if (ret != -ENOENT)
> return ret;
>
> - snprintf(name, sizeof(name), "dump-type%u-%u-%lu",
> - record->type, record->part, record->time.tv_sec);
> + snprintf(name, sizeof(name), "dump-type%u-%u-%lld",
> + record->type, record->part, (long long)record->time.tv_sec);
> ret = efi_pstore_erase_name(name);
>
> return ret;
> diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
> index 5fcb845b9fec..75afe5eb0574 100644
> --- a/fs/pstore/inode.c
> +++ b/fs/pstore/inode.c
> @@ -392,7 +392,8 @@ int pstore_mkfile(struct dentry *root, struct pstore_record *record)
> inode->i_private = private;
>
> if (record->time.tv_sec)
> - inode->i_mtime = inode->i_ctime = record->time;
> + inode->i_mtime = inode->i_ctime =
> + timespec64_to_timespec(record->time);
>
> d_add(dentry, inode);
>
> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
> index dc720573fd53..c238ab8ba31d 100644
> --- a/fs/pstore/platform.c
> +++ b/fs/pstore/platform.c
> @@ -328,7 +328,7 @@ void pstore_record_init(struct pstore_record *record,
> record->psi = psinfo;
>
> /* Report zeroed timestamp if called before timekeeping has resumed. */
> - record->time = ns_to_timespec(ktime_get_real_fast_ns());
> + record->time = ns_to_timespec64(ktime_get_real_fast_ns());
> }
>
> /*
> diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
> index 49b2bc114868..69e893076ab7 100644
> --- a/fs/pstore/ram.c
> +++ b/fs/pstore/ram.c
> @@ -38,6 +38,11 @@
>
> #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);
> @@ -153,21 +158,23 @@ ramoops_get_next_prz(struct persistent_ram_zone *przs[], uint *c, uint max,
> return prz;
> }
>
> -static int ramoops_read_kmsg_hdr(char *buffer, struct timespec *time,
> +static int ramoops_read_kmsg_hdr(char *buffer, struct timespec64 *time,
> bool *compressed)
> {
> char data_type;
> int header_length = 0;
>
> - if (sscanf(buffer, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n%n", &time->tv_sec,
> - &time->tv_nsec, &data_type, &header_length) == 3) {
> + if (sscanf(buffer, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu-%c\n%n",
> + &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 "%lu.%lu\n%n",
> - &time->tv_sec, &time->tv_nsec, &header_length) == 2) {
> - *compressed = false;
> + } else if (sscanf(buffer, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu\n%n",
> + &time->tv_sec, &time->tv_nsec,
> + &header_length) == 2) {
> + *compressed = false;
> } else {
> time->tv_sec = 0;
> time->tv_nsec = 0;
> @@ -360,7 +367,7 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz,
> char *hdr;
> size_t len;
>
> - hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR "%lu.%lu-%c\n",
> + hdr = kasprintf(GFP_ATOMIC, RAMOOPS_KERNMSG_HDR TVSEC_FMT ".%lu-%c\n",
> record->time.tv_sec,
> record->time.tv_nsec / 1000,
> record->compressed ? 'C' : 'D');
> diff --git a/include/linux/pstore.h b/include/linux/pstore.h
> index 61f806a7fe29..a15bc4d48752 100644
> --- a/include/linux/pstore.h
> +++ b/include/linux/pstore.h
> @@ -71,7 +71,7 @@ struct pstore_record {
> struct pstore_info *psi;
> enum pstore_type_id type;
> u64 id;
> - struct timespec time;
> + struct timespec64 time;
> char *buf;
> ssize_t size;
> ssize_t ecc_notice_size;
> --
> 2.17.0
>
>
> --
> Kees Cook
> Pixel Security
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