[Bug 1001151] New: fisdir_size when combined FIS and config

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           Summary: fisdir_size when combined FIS and config
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: normal
          Priority: low
         Component: RedBoot
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: stano@meduna.org
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


In redboot/current/src/flash.c:

do_flash_init:

        workspace_end = (unsigned char *)(workspace_end-fisdir_size);
        fis_work_block = workspace_end;


fis_update_directory:

#ifdef CYGSEM_REDBOOT_FLASH_COMBINED_FIS_AND_CONFIG
    memcpy((char *)fis_work_block+fisdir_size, config, cfg_size);
    conf_endian_fixup((char *)fis_work_block+fisdir_size);
    blk_size += cfg_size;
#endif



In the case the workspace_end is at the end of the usable memory, there is no
sufficiently large common ZLIB buffer and
CYGSEM_REDBOOT_FLASH_COMBINED_FIS_AND_CONFIG is set, the memcpy writes past the
end of the memory - either generating a fault or possibly wrapping around
overwriting whatever happens to be there.

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