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common: cmd_boot: Add stack canary test command.

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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>
This commit is contained in:
Md Sadre Alam 2019-05-07 11:14:57 +05:30
parent 8aef0ad840
commit f80127f8a7
2 changed files with 20 additions and 0 deletions
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1
board/qca/arm/common/cmd_bootqca.c
View file

@ -82,6 +82,7 @@ typedef struct {
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.

19
common/cmd_boot.c
View file

@ -44,6 +44,25 @@ static int do_go(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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"
);
/* -------------------------------------------------------------------- */