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dma-mapping: benchmark: fix node id validation
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[ Upstream commit 1ff05e7 ]

While validating node ids in map_benchmark_ioctl(), node_possible() may
be provided with invalid argument outside of [0,MAX_NUMNODES-1] range
leading to:

BUG: KASAN: wild-memory-access in map_benchmark_ioctl (kernel/dma/map_benchmark.c:214)
Read of size 8 at addr 1fffffff8ccb6398 by task dma_map_benchma/971
CPU: 7 PID: 971 Comm: dma_map_benchma Not tainted 6.9.0-rc6 torvalds#37
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Call Trace:
 <TASK>
dump_stack_lvl (lib/dump_stack.c:117)
kasan_report (mm/kasan/report.c:603)
kasan_check_range (mm/kasan/generic.c:189)
variable_test_bit (arch/x86/include/asm/bitops.h:227) [inline]
arch_test_bit (arch/x86/include/asm/bitops.h:239) [inline]
_test_bit at (include/asm-generic/bitops/instrumented-non-atomic.h:142) [inline]
node_state (include/linux/nodemask.h:423) [inline]
map_benchmark_ioctl (kernel/dma/map_benchmark.c:214)
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)

Compare node ids with sane bounds first. NUMA_NO_NODE is considered a
special valid case meaning that benchmarking kthreads won't be bound to a
cpuset of a given node.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 65789da ("dma-mapping: add benchmark support for streaming DMA APIs")
Signed-off-by: Fedor Pchelkin <[email protected]>
Reviewed-by: Robin Murphy <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
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Fedor Pchelkin authored and gregkh committed Jun 9, 2024
1 parent ec7740e commit 8e335ca
Showing 1 changed file with 2 additions and 1 deletion.
3 changes: 2 additions & 1 deletion kernel/dma/map_benchmark.c
Original file line number Diff line number Diff line change
Expand Up @@ -212,7 +212,8 @@ static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
}

if (map->bparam.node != NUMA_NO_NODE &&
!node_possible(map->bparam.node)) {
(map->bparam.node < 0 || map->bparam.node >= MAX_NUMNODES ||
!node_possible(map->bparam.node))) {
pr_err("invalid numa node\n");
return -EINVAL;
}
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