strncpy() is deprecated for use on NUL-terminated destination strings
[1] and as such we should prefer more robust and less ambiguous string
interfaces.
Both of these fields want to be NUL-terminated as per their use in
printk:
F_printk("%u:%s:%s (%u)%s",
__entry->line,
__entry->func, __entry->file, __entry->correct,
__entry->constant ? " CONSTANT" : "")
Use strscpy() as it NUL-terminates the destination buffer, so it doesn't
have to be done manually.
Link:
https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
[1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinst...@google.com>
---
kernel/trace/trace_branch.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index e47fdb4c92fb..aa63548873c3 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -74,10 +74,8 @@ probe_likely_condition(struct ftrace_likely_data *f, int
val, int expect)
p--;
p++;
- strncpy(entry->func, f->data.func, TRACE_FUNC_SIZE);
- strncpy(entry->file, p, TRACE_FILE_SIZE);
- entry->func[TRACE_FUNC_SIZE] = 0;
- entry->file[TRACE_FILE_SIZE] = 0;
+ strscpy(entry->func, f->data.func);
+ strscpy(entry->file, p);
entry->constant = f->constant;
entry->line = f->data.line;
entry->correct = val == expect;
---
base-commit: 521b1e7f4cf0b05a47995b103596978224b380a8
change-id: 20240820-strncpy-kernel-trace-trace_branch-c-0a953ebcdfe1
Best regards,
--
Justin Stitt <justinst...@google.com>
