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| author | Rob Herring <rob.herring@calxeda.com> | 2013-03-22 11:26:21 (GMT) |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-04-02 20:23:34 (GMT) |
| commit | 60d7d5a63189c9f77a190c9965861dc15482c2d0 (patch) | |
| tree | 68bf7c543f8f282142eb7a10c700b3a3d86341fb /common/env_eeprom.c | |
| parent | c17b94ec5ec89c63070dd385b6c3a6645761c405 (diff) | |
| download | u-boot-60d7d5a63189c9f77a190c9965861dc15482c2d0.tar.xz | |
env: fix potential stack overflow in environment functions
Most of the various environment functions create CONFIG_ENV_SIZE buffers on
the stack. At least on ARM and PPC which have 4KB stacks, this can overflow
the stack if we have large environment sizes. So move all the buffers off
the stack to static buffers.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Diffstat (limited to 'common/env_eeprom.c')
| -rw-r--r-- | common/env_eeprom.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/common/env_eeprom.c b/common/env_eeprom.c index 45c935b..b136f04 100644 --- a/common/env_eeprom.c +++ b/common/env_eeprom.c @@ -38,6 +38,7 @@ DECLARE_GLOBAL_DATA_PTR; env_t *env_ptr; +static char env_buf[CONFIG_ENV_SIZE]; char *env_name_spec = "EEPROM"; int env_eeprom_bus = -1; @@ -111,7 +112,7 @@ uchar env_get_char_spec(int index) void env_relocate_spec(void) { - char buf[CONFIG_ENV_SIZE]; + char *buf = env_buf; unsigned int off = CONFIG_ENV_OFFSET; #ifdef CONFIG_ENV_OFFSET_REDUND @@ -126,7 +127,7 @@ void env_relocate_spec(void) int saveenv(void) { - env_t env_new; + env_t *env_new = (env_t *)env_buf; ssize_t len; char *res; int rc; @@ -138,13 +139,13 @@ int saveenv(void) BUG_ON(env_ptr != NULL); - res = (char *)&env_new.data; + res = (char *)env_new->data; len = hexport_r(&env_htab, '\0', 0, &res, ENV_SIZE, 0, NULL); if (len < 0) { error("Cannot export environment: errno = %d\n", errno); return 1; } - env_new.crc = crc32(0, env_new.data, ENV_SIZE); + env_new->crc = crc32(0, env_new->data, ENV_SIZE); #ifdef CONFIG_ENV_OFFSET_REDUND if (gd->env_valid == 1) { @@ -152,11 +153,11 @@ int saveenv(void) off_red = CONFIG_ENV_OFFSET; } - env_new.flags = ACTIVE_FLAG; + env_new->flags = ACTIVE_FLAG; #endif rc = eeprom_bus_write(CONFIG_SYS_DEF_EEPROM_ADDR, - off, (uchar *)&env_new, CONFIG_ENV_SIZE); + off, (uchar *)env_new, CONFIG_ENV_SIZE); #ifdef CONFIG_ENV_OFFSET_REDUND if (rc == 0) { |