WORM-Xlator: Maybe integer overflow when computing new atime

The structs worm_reten_state_t and read_only_priv_t from read-only.h are
using uint64_t values to store periods of retention and autocommmit.
This seems to be dangerous since in worm-helper.c the function
worm_set_state computes in line 97:

stbuf->ia_atime = time(NULL) + retention_state->ret_period;

stbuf->ia_atime is using int64_t because of the settings of struct
iattr. So if there is a very very high retention period stored, there
is maybe an integer overflow.

What can be the solution? Using int64_t instead if uint64_t may reduce
the probability of the occurance.

Change-Id: Id1e86c6b20edd53f171c4cfcb528804ba7881f65
fixes: bz#1685944
Signed-off-by: David Spisla <david.spisla@iternity.com>

2 files changed, 8 insertions, 8 deletions

diff --git a/xlators/features/read-only/src/read-only.h b/xlators/features/read-only/src/read-only.h
index b959d2a44fb..fc32f82f8c5 100644
--- a/xlators/features/read-only/src/read-only.h
+++ b/xlators/features/read-only/src/read-only.h
@@ -19,16 +19,16 @@ typedef struct {
     uint8_t retain : 1;
     uint8_t legal_hold : 1;
     uint8_t ret_mode : 1;
-    uint64_t ret_period;
-    uint64_t auto_commit_period;
+    int64_t ret_period;
+    int64_t auto_commit_period;
 } worm_reten_state_t;
 
 typedef struct {
     gf_boolean_t readonly_or_worm_enabled;
     gf_boolean_t worm_file;
     gf_boolean_t worm_files_deletable;
-    uint64_t reten_period;
-    uint64_t com_period;
+    int64_t reten_period;
+    int64_t com_period;
     int reten_mode;
     time_t start_time;
 } read_only_priv_t;
diff --git a/xlators/features/read-only/src/worm.c b/xlators/features/read-only/src/worm.c
index 24196f83931..cc3d15b8b2a 100644
--- a/xlators/features/read-only/src/worm.c
+++ b/xlators/features/read-only/src/worm.c
@@ -519,8 +519,8 @@ init(xlator_t *this)
 
     GF_OPTION_INIT("worm", priv->readonly_or_worm_enabled, bool, out);
     GF_OPTION_INIT("worm-file-level", priv->worm_file, bool, out);
-    GF_OPTION_INIT("default-retention-period", priv->reten_period, uint64, out);
-    GF_OPTION_INIT("auto-commit-period", priv->com_period, uint64, out);
+    GF_OPTION_INIT("default-retention-period", priv->reten_period, int64, out);
+    GF_OPTION_INIT("auto-commit-period", priv->com_period, int64, out);
     GF_OPTION_INIT("retention-mode", reten_mode, str, out);
     set_reten_mode(priv, reten_mode);
     GF_OPTION_INIT("worm-files-deletable", priv->worm_files_deletable, bool,
@@ -545,10 +545,10 @@ reconfigure(xlator_t *this, dict_t *options)
                      out);
     GF_OPTION_RECONF("worm-file-level", priv->worm_file, options, bool, out);
     GF_OPTION_RECONF("default-retention-period", priv->reten_period, options,
-                     uint64, out);
+                     int64, out);
     GF_OPTION_RECONF("retention-mode", reten_mode, options, str, out);
     set_reten_mode(priv, reten_mode);
-    GF_OPTION_RECONF("auto-commit-period", priv->com_period, options, uint64,
+    GF_OPTION_RECONF("auto-commit-period", priv->com_period, options, int64,
                      out);
     GF_OPTION_RECONF("worm-files-deletable", priv->worm_files_deletable,
                      options, bool, out);