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dma-mapping: benchmark: handle NUMA_NO_NODE correctly

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cpumask_of_node() can be called for NUMA_NO_NODE inside do_map_benchmark()
resulting in the following sanitizer report:

UBSAN: array-index-out-of-bounds in ./arch/x86/include/asm/topology.h:72:28
index -1 is out of range for type 'cpumask [64][1]'
CPU: 1 PID: 990 Comm: dma_map_benchma Not tainted 6.9.0-rc6 #29
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Call Trace:
 <TASK>
dump_stack_lvl (lib/dump_stack.c:117)
ubsan_epilogue (lib/ubsan.c:232)
__ubsan_handle_out_of_bounds (lib/ubsan.c:429)
cpumask_of_node (arch/x86/include/asm/topology.h:72) [inline]
do_map_benchmark (kernel/dma/map_benchmark.c:104)
map_benchmark_ioctl (kernel/dma/map_benchmark.c:246)
full_proxy_unlocked_ioctl (fs/debugfs/file.c:333)
__x64_sys_ioctl (fs/ioctl.c:890)
do_syscall_64 (arch/x86/entry/common.c:83)
entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)

Use cpumask_of_node() in place when binding a kernel thread to a cpuset
of a particular node.

Note that the provided node id is checked inside map_benchmark_ioctl().
It's just a NUMA_NO_NODE case which is not handled properly later.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 65789daa80 ("dma-mapping: add benchmark support for streaming DMA APIs")
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Acked-by: Barry Song <baohua@kernel.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Fedor Pchelkin 2024-05-04 14:47:04 +03:00 committed by Christoph Hellwig
parent 1ff05e723f
commit e64746e74f
1 changed files with 1 additions and 2 deletions
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3
kernel/dma/map_benchmark.c
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@ -101,7 +101,6 @@ static int do_map_benchmark(struct map_benchmark_data *map)
struct task_struct **tsk; struct task_struct **tsk;
int threads = map->bparam.threads; int threads = map->bparam.threads;
int node = map->bparam.node; int node = map->bparam.node;
const cpumask_t *cpu_mask = cpumask_of_node(node);
u64 loops; u64 loops;
int ret = 0; int ret = 0;
int i; int i;
@ -124,7 +123,7 @@ static int do_map_benchmark(struct map_benchmark_data *map)
} }
if (node != NUMA_NO_NODE) if (node != NUMA_NO_NODE)
kthread_bind_mask(tsk[i], cpu_mask); kthread_bind_mask(tsk[i], cpumask_of_node(node));
} }
/* clear the old value in the previous benchmark */ /* clear the old value in the previous benchmark */