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flash/nor/core: fix Segmentation fault during flash write of bad formed img 

flash_write_unlock() sorts sections by base address but does not check
if they overlap. In case of overlapped sections an item of padding[]
array can get negative and padding loop writes out of allocated buffer.

How to replicate: cat two copies of an ihex file to one file and try
to flash it.

Check for overlapped sections and abort write in such case.

Change-Id: I43eee7dc290a8d18faa59567b2118b88ad4bedca
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/4397
Tested-by: jenkins
Reviewed-by: Andreas Bolsch <hyphen0break@gmail.com>
This commit is contained in:
Tomas Vanek 2018-02-08 14:44:10 +01:00
parent efe6991e80
commit cb75947a09
1 changed files with 14 additions and 3 deletions
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17
src/flash/nor/core.c
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@ -601,7 +601,7 @@ int flash_write_unlock(struct target *target, struct image *image,
uint32_t buffer_size;
uint8_t *buffer;
int section_last;
uint32_t run_address = sections[section]->base_address + section_offset;
target_addr_t run_address = sections[section]->base_address + section_offset;
uint32_t run_size = sections[section]->size - section_offset;
int pad_bytes = 0;
@ -617,7 +617,7 @@ int flash_write_unlock(struct target *target, struct image *image,
if (retval != ERROR_OK)
goto done;
if (c == NULL) {
LOG_WARNING("no flash bank found for address %" PRIx32, run_address);
LOG_WARNING("no flash bank found for address " TARGET_ADDR_FMT, run_address);
section++; /* and skip it */
section_offset = 0;
continue;
@ -652,7 +652,18 @@ int flash_write_unlock(struct target *target, struct image *image,
/* if we have multiple sections within our image,
* flash programming could fail due to alignment issues
* attempt to rebuild a consecutive buffer for the flash loader */
pad_bytes = (sections[section_last + 1]->base_address) - (run_address + run_size);
target_addr_t run_next_addr = run_address + run_size;
if (sections[section_last + 1]->base_address < run_next_addr) {
LOG_ERROR("Section at " TARGET_ADDR_FMT
" overlaps section ending at " TARGET_ADDR_FMT,
sections[section_last + 1]->base_address,
run_next_addr);
LOG_ERROR("Flash write aborted.");
retval = ERROR_FAIL;
goto done;
}
pad_bytes = sections[section_last + 1]->base_address - run_next_addr;
padding[section_last] = pad_bytes;
run_size += sections[++section_last]->size;
run_size += pad_bytes;