linux-kernel - [PATCH 2/2] tools/power turbostat: Fix offset overflow issue in index converting

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Message-Id: <8167875a1d688b92b0ec707b95855a604afacf01.1619600637.git.yu.c.chen@intel.com>
Date:   Wed, 28 Apr 2021 17:09:16 +0800
From:   Chen Yu <yu.c.chen@...el.com>
To:     youling257 <youling257@...il.com>, Kurt Garloff <kurt@...loff.de>,
        Bingsong Si <owen.si@...oud.cn>,
        "Artem S . Tashkinov" <aros@....com>
Cc:     Terry Bowman <terry.bowman@....com>,
        Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
        Calvin Walton <calvin.walton@...stin.ca>,
        Borislav Petkov <bp@...e.de>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] tools/power turbostat: Fix offset overflow issue in index converting

From: Calvin Walton <calvin.walton@...stin.ca>

The idx_to_offset() function returns type int (32-bit signed), but
MSR_PKG_ENERGY_STAT is u32 and would be interpreted as a negative number.
The end result is that it hits the if (offset < 0) check in update_msr_sum()
which prevents the timer callback from updating the stat in the background when
long durations are used. The similar issue exists in offset_to_idx() and
update_msr_sum(). Fix this issue by converting the 'int' to 'off_t' accordingly.

Fixes: 9972d5d84d76 ("tools/power turbostat: Enable accumulate RAPL display")
Signed-off-by: Calvin Walton <calvin.walton@...stin.ca>
---
 tools/power/x86/turbostat/turbostat.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 37759d6c463d..085057daef86 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -291,9 +291,9 @@ struct msr_sum_array {
 /* The percpu MSR sum array.*/
 struct msr_sum_array *per_cpu_msr_sum;
 
-int idx_to_offset(int idx)
+off_t idx_to_offset(int idx)
 {
-	int offset;
+	off_t offset;
 
 	switch (idx) {
 	case IDX_PKG_ENERGY:
@@ -323,7 +323,7 @@ int idx_to_offset(int idx)
 	return offset;
 }
 
-int offset_to_idx(int offset)
+int offset_to_idx(off_t offset)
 {
 	int idx;
 
@@ -3276,7 +3276,7 @@ static int update_msr_sum(struct thread_data *t, struct core_data *c, struct pkg
 
 	for (i = IDX_PKG_ENERGY; i < IDX_COUNT; i++) {
 		unsigned long long msr_cur, msr_last;
-		int offset;
+		off_t offset;
 
 		if (!idx_valid(i))
 			continue;
@@ -3285,7 +3285,8 @@ static int update_msr_sum(struct thread_data *t, struct core_data *c, struct pkg
 			continue;
 		ret = get_msr(cpu, offset, &msr_cur);
 		if (ret) {
-			fprintf(outf, "Can not update msr(0x%x)\n", offset);
+			fprintf(outf, "Can not update msr(0x%llx)\n",
+				(unsigned long long)offset);
 			continue;
 		}
 
-- 
2.25.1