common: cmd_boot: Add stack canary test command.
This change will add stack canary test command in
u-boot command list.
The stack canary test command format like as :
canary <string>. The string must be 10 bytes long.
e.g
" #canary Helloworldhelloworld".
After this command we can see the below print.
Stack Canary test start.
stack-protector: U-boot stack is corrupted.
Resetting CPU ...
If stack-protection not enabled and stack overflow
occure then we will get the following print.
prefetch abort
pc : [<4a006f72>] lr : [<4a90faf0>]
reloc pc : [<4a006f72>] lr : [<4a90faf0>]
sp : 4a77f948 ip : 20f14495 fp : 4a90fab4
r10: 00000002 r9 : 4a77fea0 r8 : 00000000
r7 : 4a983d20 r6 : 6f6f6f6f r5 : 6f6f6f6f r4 : 6f6f6f6f
r3 : 00000000 r2 : 4a77f946 r1 : 4a78233b r0 : 00000000
Flags: nZCv IRQs off FIQs off Mode SVC_32
Resetting CPU ...
Change-Id: If36d1da3ecc1d0038cd1a6bad6ab3d265b47dac8
Signed-off-by: Md Sadre Alam <mdalam@codeaurora.org>
diff --git a/board/qca/arm/common/cmd_bootqca.c b/board/qca/arm/common/cmd_bootqca.c
index a787d55..d1a5ad0 100644
--- a/board/qca/arm/common/cmd_bootqca.c
+++ b/board/qca/arm/common/cmd_bootqca.c
@@ -82,6 +82,7 @@
void __stack_chk_fail(void)
{
printf("stack-protector: U-boot stack is corrupted.\n");
+ bad_mode ();
}
/*
* Set the root device and bootargs for mounting root filesystem.
diff --git a/common/cmd_boot.c b/common/cmd_boot.c
index 8f2e070..ad5fcdf 100644
--- a/common/cmd_boot.c
+++ b/common/cmd_boot.c
@@ -44,6 +44,25 @@
printf ("## Application terminated, rc = 0x%lX\n", rc);
return rcode;
}
+static int do_canary(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ char Buffer[10] = {'\0'};
+ printf("Stack Canary test start.\n");
+
+ if (argc < 2 || argc > 2)
+ return CMD_RET_USAGE;
+
+ strlcpy(Buffer, argv[1], strlen(argv[1]));
+
+ return 0;
+}
+
+U_BOOT_CMD(
+ canary, 2, 0, do_canary,
+ "test stack canary",
+ "\n canary HelloworldHelloWorld \n"
+);
/* -------------------------------------------------------------------- */