diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0110-USB-gadget-fix-illegal-array-access-in-binding-with-.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0110-USB-gadget-fix-illegal-array-access-in-binding-with-.patch | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0110-USB-gadget-fix-illegal-array-access-in-binding-with-.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0110-USB-gadget-fix-illegal-array-access-in-binding-with-.patch new file mode 100644 index 000000000..542d80e16 --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0110-USB-gadget-fix-illegal-array-access-in-binding-with-.patch @@ -0,0 +1,75 @@ +From 15753588bcd4bbffae1cca33c8ced5722477fe1f Mon Sep 17 00:00:00 2001 +From: Kyungtae Kim <kt0755@gmail.com> +Date: Sun, 10 May 2020 05:43:34 +0000 +Subject: [PATCH] USB: gadget: fix illegal array access in binding with UDC + +FuzzUSB (a variant of syzkaller) found an illegal array access +using an incorrect index while binding a gadget with UDC. + +Reference: https://www.spinics.net/lists/linux-usb/msg194331.html + +This bug occurs when a size variable used for a buffer +is misused to access its strcpy-ed buffer. +Given a buffer along with its size variable (taken from user input), +from which, a new buffer is created using kstrdup(). +Due to the original buffer containing 0 value in the middle, +the size of the kstrdup-ed buffer becomes smaller than that of the original. +So accessing the kstrdup-ed buffer with the same size variable +triggers memory access violation. + +The fix makes sure no zero value in the buffer, +by comparing the strlen() of the orignal buffer with the size variable, +so that the access to the kstrdup-ed buffer is safe. + +BUG: KASAN: slab-out-of-bounds in gadget_dev_desc_UDC_store+0x1ba/0x200 +drivers/usb/gadget/configfs.c:266 +Read of size 1 at addr ffff88806a55dd7e by task syz-executor.0/17208 + +CPU: 2 PID: 17208 Comm: syz-executor.0 Not tainted 5.6.8 #1 +Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 +Call Trace: + __dump_stack lib/dump_stack.c:77 [inline] + dump_stack+0xce/0x128 lib/dump_stack.c:118 + print_address_description.constprop.4+0x21/0x3c0 mm/kasan/report.c:374 + __kasan_report+0x131/0x1b0 mm/kasan/report.c:506 + kasan_report+0x12/0x20 mm/kasan/common.c:641 + __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:132 + gadget_dev_desc_UDC_store+0x1ba/0x200 drivers/usb/gadget/configfs.c:266 + flush_write_buffer fs/configfs/file.c:251 [inline] + configfs_write_file+0x2f1/0x4c0 fs/configfs/file.c:283 + __vfs_write+0x85/0x110 fs/read_write.c:494 + vfs_write+0x1cd/0x510 fs/read_write.c:558 + ksys_write+0x18a/0x220 fs/read_write.c:611 + __do_sys_write fs/read_write.c:623 [inline] + __se_sys_write fs/read_write.c:620 [inline] + __x64_sys_write+0x73/0xb0 fs/read_write.c:620 + do_syscall_64+0x9e/0x510 arch/x86/entry/common.c:294 + entry_SYSCALL_64_after_hwframe+0x49/0xbe + +Signed-off-by: Kyungtae Kim <kt0755@gmail.com> +Reported-and-tested-by: Kyungtae Kim <kt0755@gmail.com> +Cc: Felipe Balbi <balbi@kernel.org> +Cc: stable <stable@vger.kernel.org> +Link: https://lore.kernel.org/r/20200510054326.GA19198@pizza01 +Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> +--- + drivers/usb/gadget/configfs.c | 3 +++ + 1 file changed, 3 insertions(+) + +diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c +index 32b637e3e1fa..6a9aa4413d64 100644 +--- a/drivers/usb/gadget/configfs.c ++++ b/drivers/usb/gadget/configfs.c +@@ -260,6 +260,9 @@ static ssize_t gadget_dev_desc_UDC_store(struct config_item *item, + char *name; + int ret; + ++ if (strlen(page) < len) ++ return -EOVERFLOW; ++ + name = kstrdup(page, GFP_KERNEL); + if (!name) + return -ENOMEM; +-- +2.7.4 + |