linux-hardening - [PATCH] perf/x86/amd/uncore: Use kcalloc*() instead of kzalloc*()

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Date: Tue, 16 Jan 2024 13:58:13 +0100
From: Erick Archer <erick.archer@....com>
To: Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	x86@...nel.org
Cc: Erick Archer <erick.archer@....com>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] perf/x86/amd/uncore: Use kcalloc*() instead of kzalloc*()

As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific kcalloc*() function instead of the argument
size * count in the kzalloc*() function.

[1] https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Link: https://github.com/KSPP/linux/issues/162
Signed-off-by: Erick Archer <erick.archer@....com>
---
 arch/x86/events/amd/uncore.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/events/amd/uncore.c b/arch/x86/events/amd/uncore.c
index 5bf03c575812..9073eb0613cf 100644
--- a/arch/x86/events/amd/uncore.c
+++ b/arch/x86/events/amd/uncore.c
@@ -479,8 +479,8 @@ static int amd_uncore_ctx_init(struct amd_uncore *uncore, unsigned int cpu)
 				goto fail;

 			curr->cpu = cpu;
-			curr->events = kzalloc_node(sizeof(*curr->events) *
-						    pmu->num_counters,
+			curr->events = kcalloc_node(pmu->num_counters,
+						    sizeof(*curr->events),
 						    GFP_KERNEL, node);
 			if (!curr->events) {
 				kfree(curr);
@@ -928,7 +928,7 @@ int amd_uncore_umc_ctx_init(struct amd_uncore *uncore, unsigned int cpu)
 		uncore->num_pmus += group_num_pmus[gid];
 	}

-	uncore->pmus = kzalloc(sizeof(*uncore->pmus) * uncore->num_pmus,
+	uncore->pmus = kcalloc(uncore->num_pmus, sizeof(*uncore->pmus),
 			       GFP_KERNEL);
 	if (!uncore->pmus) {
 		uncore->num_pmus = 0;
--
2.25.1