mbedtls sample app fails when using heap allocation
Posted: Fri Jun 16, 2017 4:07 pm
Hi,
I'm trying to get mbedtls working on my ESP32 but have encountered a strange problem around allocation.
When I attempt to allocate the mbedtls_ssl_context struct on the heap rather than the stack, the program subsequently fails to allocate memory for the certificates. I've attached a sample program with this issue, based on [url]https://github.com/ARMmbed/mbedtls/blob ... rver.c/url], with the primary change as follows:
becomes
Any help would be much appreciated 
Here's my output from the console:
and where GDB tells me the program halted:
I'm trying to get mbedtls working on my ESP32 but have encountered a strange problem around allocation.
When I attempt to allocate the mbedtls_ssl_context struct on the heap rather than the stack, the program subsequently fails to allocate memory for the certificates. I've attached a sample program with this issue, based on [url]https://github.com/ARMmbed/mbedtls/blob ... rver.c/url], with the primary change as follows:
Code: Select all
mbedtls_ssl_context ssl;Code: Select all
mbedtls_ssl_context *ssl = malloc(sizeof(mbedtls_ssl_context));Here's my output from the console:
Code: Select all
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0008,len:8
load:0x3fff0010,len:3444
load:0x40078000,len:10356
load:0x40080000,len:252
entry 0x40080034
I (1135) wifi: wifi firmware version: 41eede3
I (1135) wifi: config NVS flash: enabled
I (1135) wifi: config nano formating: disabled
I (1140) wifi: Init dynamic tx buffer num: 32
I (1141) wifi: Init dynamic rx buffer num: 32
I (1145) wifi: wifi driver task: 3ffcde94, prio:23, stack:4096
I (1150) wifi: Init static rx buffer num: 10
I (1154) wifi: Init dynamic rx buffer num: 32
I (1158) wifi: Init rx ampdu len mblock:7
I (1162) wifi: Init lldesc rx ampdu entry mblock:4
I (1166) wifi: wifi power manager task: 0x3ffd326c prio: 21 stack: 2560
I (1173) wifi: wifi timer task: 3ffd42fc, prio:22, stack:3584
I (1199) wifi: mode : sta (24:0a:c4:04:52:64)
I (2527) wifi: n:11 0, o:1 0, ap:255 255, sta:11 0, prof:1
I (3184) wifi: state: init -> auth (b0)
I (3186) wifi: state: auth -> assoc (0)
I (3191) wifi: state: assoc -> run (10)
I (3213) wifi: connected with LXIII-D, channel 11
. Loading the server cert. and key…[0m
[0;32mI (4791) PEM: Free RAM: 174432[0m
Guru Meditation Error of type LoadProhibited occurred on core 0. Exception was unhandled.
Register dump:
PC : 0x40083283 PS : 0x00060633 A0 : 0x800833e0 A1 : 0x3ffcb7c0
A2 : 0x3ffd52b8 A3 : 0x00000000 A4 : 0xff000000 A5 : 0x80ffffff
A6 : 0x00000005 A7 : 0x00000000 A8 : 0x00000000 A9 : 0x00000000
A10 : 0x3ffc0b68 A11 : 0x00000000 A12 : 0x3ffcc6c8 A13 : 0x00000000
A14 : 0x00000000 A15 : 0x3ffcb8b0 SAR : 0x00000004 EXCCAUSE: 0x0000001c
EXCVADDR: 0x00000000 LBEG : 0x400014fd LEND : 0x4000150d LCOUNT : 0xfffffffe
Backtrace: 0x40083283:0x3ffcb7c0 0x400833e0:0x3ffcb7e0 0x400862b3:0x3ffcb800 0x400862f4:0x3ffcb820 0x40081a9c:0x3ffcb840 0x4000bef8:0x3ffcb860 0x40123710:0x3ffcb880 0x40115e8e:0x3ffcb8d0 0x400def59:0x3ffcb920 0x400df2ea:0x3ffcc310 0x400e0000:0x3ffcc330 0x400e003c:0x3ffcc350
CPU halted.Code: Select all
0x40170954 is in mbedtls_pem_read_buffer (/Users/stephenbarker/bin/espressif/esp32/esp-idf/components/mbedtls/library/pem.c:327).
322 ret = mbedtls_base64_decode( NULL, 0, &len, s1, s2 - s1 );
323
324 if( ret == MBEDTLS_ERR_BASE64_INVALID_CHARACTER )
325 return( MBEDTLS_ERR_PEM_INVALID_DATA + ret );
326
327 if( ( buf = mbedtls_calloc( 1, len ) ) == NULL )
328 return( MBEDTLS_ERR_PEM_ALLOC_FAILED );
329
330 if( ( ret = mbedtls_base64_decode( buf, len, &len, s1, s2 - s1 ) ) != 0 )
331 {