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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-14 19:07:19 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-11-14 19:07:19 -0800 |
| commit | 8ab774587903771821b59471cc723bba6d893942 (patch) | |
| tree | 20ff73bb47bc9f6f9ea42ad950b6714fa5c183bf /kernel | |
| parent | kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x (diff) | |
| parent | tracing: Add length protection to histogram string copies (diff) | |
| download | linux-dev-8ab774587903771821b59471cc723bba6d893942.tar.xz linux-dev-8ab774587903771821b59471cc723bba6d893942.zip | |
Merge tag 'trace-v5.16-5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
Pull tracing fix from Steven Rostedt:
"Update to tracing histogram variable string copy
A fix to only copy the size of the field to the histogram string did
not take into account that the size can be larger than the storage"
* tag 'trace-v5.16-5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
tracing: Add length protection to histogram string copies
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 8a10046c775f..5ea2c9ec54a6 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -3026,8 +3026,10 @@ static inline void __update_field_vars(struct tracing_map_elt *elt, if (val->flags & HIST_FIELD_FL_STRING) { char *str = elt_data->field_var_str[j++]; char *val_str = (char *)(uintptr_t)var_val; + unsigned int size; - strscpy(str, val_str, val->size); + size = min(val->size, STR_VAR_LEN_MAX); + strscpy(str, val_str, size); var_val = (u64)(uintptr_t)str; } tracing_map_set_var(elt, var_idx, var_val); @@ -4914,6 +4916,7 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, if (hist_field->flags & HIST_FIELD_FL_STRING) { unsigned int str_start, var_str_idx, idx; char *str, *val_str; + unsigned int size; str_start = hist_data->n_field_var_str + hist_data->n_save_var_str; @@ -4922,7 +4925,9 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data, str = elt_data->field_var_str[idx]; val_str = (char *)(uintptr_t)hist_val; - strscpy(str, val_str, hist_field->size); + + size = min(hist_field->size, STR_VAR_LEN_MAX); + strscpy(str, val_str, size); hist_val = (u64)(uintptr_t)str; } |