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| author | Jordy Zomer <jordy@pwning.systems> | 2022-01-29 16:06:04 +0100 |
|---|---|---|
| committer | Sumit Semwal <sumit.semwal@linaro.org> | 2022-02-01 08:48:09 +0100 |
| commit | 92c4cfaee6872038563c5b6f2e8e613f9d84d47d (patch) | |
| tree | 6ce6eacdcc10c27bf52fe84152d9f8712fded63a | |
| parent | drm/nouveau: fix off by one in BIOS boundary checking (diff) | |
| download | linux-92c4cfaee6872038563c5b6f2e8e613f9d84d47d.tar.xz linux-92c4cfaee6872038563c5b6f2e8e613f9d84d47d.zip | |
dma-buf: heaps: Fix potential spectre v1 gadget
It appears like nr could be a Spectre v1 gadget as it's supplied by a
user and used as an array index. Prevent the contents
of kernel memory from being leaked to userspace via speculative
execution by using array_index_nospec.
Signed-off-by: Jordy Zomer <jordy@pwning.systems>
Fixes: c02a81fba74f ("dma-buf: Add dma-buf heaps framework")
Cc: <stable@vger.kernel.org> # v5.6+
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
[sumits: added fixes and cc: stable tags]
Link: https://patchwork.freedesktop.org/patch/msgid/20220129150604.3461652-1-jordy@pwning.systems
| -rw-r--r-- | drivers/dma-buf/dma-heap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/dma-buf/dma-heap.c b/drivers/dma-buf/dma-heap.c index 56bf5ad01ad5..8f5848aa144f 100644 --- a/drivers/dma-buf/dma-heap.c +++ b/drivers/dma-buf/dma-heap.c @@ -14,6 +14,7 @@ #include <linux/xarray.h> #include <linux/list.h> #include <linux/slab.h> +#include <linux/nospec.h> #include <linux/uaccess.h> #include <linux/syscalls.h> #include <linux/dma-heap.h> @@ -135,6 +136,7 @@ static long dma_heap_ioctl(struct file *file, unsigned int ucmd, if (nr >= ARRAY_SIZE(dma_heap_ioctl_cmds)) return -EINVAL; + nr = array_index_nospec(nr, ARRAY_SIZE(dma_heap_ioctl_cmds)); /* Get the kernel ioctl cmd that matches */ kcmd = dma_heap_ioctl_cmds[nr]; |