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tracing: Reject string operand in the histogram expression 

commit a9d10ca4986571bffc19778742d508cc8dd13e02 upstream.

Since the string type can not be the target of the addition / subtraction
operation, it must be rejected. Without this fix, the string type silently
converted to digits.

Link: https://lkml.kernel.org/r/162742654278.290973.1523000673366456634.stgit@devnote2

Cc: stable@vger.kernel.org
Fixes: 100719dcef ("tracing: Add simple expression support to hist triggers")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu 2021-07-28 07:55:43 +09:00 committed by Greg Kroah-Hartman
parent 28276c280f
commit 396f29ea0c
1 changed files with 19 additions and 1 deletions
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20
kernel/trace/trace_events_hist.c
View File

@ -66,7 +66,8 @@
C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \
C(INVALID_REF_KEY, "Using variable references in keys not supported"), \
C(VAR_NOT_FOUND, "Couldn't find variable"), \
C(FIELD_NOT_FOUND, "Couldn't find field"),
C(FIELD_NOT_FOUND, "Couldn't find field"), \
C(INVALID_STR_OPERAND, "String type can not be an operand in expression"),
#undef C
#define C(a, b) HIST_ERR_##a
@ -3038,6 +3039,13 @@ static struct hist_field *parse_unary(struct hist_trigger_data *hist_data,
ret = PTR_ERR(operand1);
goto free;
}
if (operand1->flags & HIST_FIELD_FL_STRING) {
/* String type can not be the operand of unary operator. */
hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
destroy_hist_field(operand1, 0);
ret = -EINVAL;
goto free;
}
expr->flags |= operand1->flags &
(HIST_FIELD_FL_TIMESTAMP | HIST_FIELD_FL_TIMESTAMP_USECS);
@ -3139,6 +3147,11 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
operand1 = NULL;
goto free;
}
if (operand1->flags & HIST_FIELD_FL_STRING) {
hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(operand1_str));
ret = -EINVAL;
goto free;
}
/* rest of string could be another expression e.g. b+c in a+b+c */
operand_flags = 0;
@ -3148,6 +3161,11 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
operand2 = NULL;
goto free;
}
if (operand2->flags & HIST_FIELD_FL_STRING) {
hist_err(file->tr, HIST_ERR_INVALID_STR_OPERAND, errpos(str));
ret = -EINVAL;
goto free;
}
ret = check_expr_operands(file->tr, operand1, operand2);
if (ret)