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The kfifo backing buffer is\n2048 bytes (SNOOP_FIFO_SIZE), allocated from kmalloc-2k slab.\nA read larger than 2048 bytes triggers a BUG under\nCONFIG_HARDENED_USERCOPY:\n\n kernel BUG at mm/usercopy.c:99!\n\nReproducer:\n hexdump /dev/aspeed-lpc-snoop0\n\nFix by clamping count to SNOOP_FIFO_SIZE before the copy.\n\nFixes: 3772e5da4454 (\"drivers/misc: Aspeed LPC snoop output using misc chardev\")\nCc: stable@vger.kernel.org\nSigned-off-by: Karthikeyan KS \n---\n drivers/soc/aspeed/aspeed-lpc-snoop.c | 1 +\n 1 file changed, 1 insertion(+)","diff":"diff --git a/drivers/soc/aspeed/aspeed-lpc-snoop.c b/drivers/soc/aspeed/aspeed-lpc-snoop.c\nindex b03310c0830d..5b59e826cc68 100644\n--- a/drivers/soc/aspeed/aspeed-lpc-snoop.c\n+++ b/drivers/soc/aspeed/aspeed-lpc-snoop.c\n@@ -125,6 +125,7 @@ static ssize_t snoop_file_read(struct file *file, char __user *buffer,\n if (ret == -ERESTARTSYS)\n return -EINTR;\n }\n+ count = min(count, (size_t)SNOOP_FIFO_SIZE);\n ret = kfifo_to_user(&chan->fifo, buffer, count, &copied);\n if (ret)\n return ret;\n","prefixes":[]}