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layout: Verify layout entries before building a new image using them

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This fixes a SEGFAULT if a layout entry is included that addresses memory
outside the current chip's address range. flashrom will only abort if the
offending region(s) is/are included else it will just warn.

It will print warnings for regions with negative or zero-length address ranges
and bail out after checking all of them.

Also, abort for non-write operations if a layout file is given because there is
no layout support for other operations yet.

Corresponding to flashrom svn r1751.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
This commit is contained in:
Stefan Tauner
2013-09-23 14:21:06 +00:00
parent a6a0d2000a
commit 8268fdb902
4 changed files with 52 additions and 8 deletions
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32
layout.c
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@ -29,15 +29,15 @@
#define MAX_ROMLAYOUT 32
typedef struct {
unsigned int start;
unsigned int end;
chipoff_t start;
chipoff_t end;
unsigned int included;
char name[256];
} romentry_t;
/* rom_entries store the entries specified in a layout file and associated run-time data */
static romentry_t rom_entries[MAX_ROMLAYOUT];
static int num_rom_entries = 0; /* the number of valid rom_entries */
static int num_rom_entries = 0; /* the number of successfully parsed rom_entries */
/* include_args holds the arguments specified at the command line with -i. They must be processed at some point
* so that desired regions are marked as "included" in the rom_entries list. */
@ -232,7 +232,31 @@ romentry_t *get_next_included_romentry(unsigned int start)
return best_entry;
}
int handle_romentries(const struct flashctx *flash, uint8_t *oldcontents, uint8_t *newcontents)
/* Validate and - if needed - normalize layout entries. */
int normalize_romentries(const struct flashctx *flash)
{
chipsize_t total_size = flash->chip->total_size * 1024;
int ret = 0;
int i;
for (i = 0; i < num_rom_entries; i++) {
if (rom_entries[i].start >= total_size || rom_entries[i].end >= total_size) {
msg_gwarn("Warning: Address range of region \"%s\" exceeds the current chip's "
"address space.\n", rom_entries[i].name);
if (rom_entries[i].included)
ret = 1;
}
if (rom_entries[i].start > rom_entries[i].end) {
msg_gerr("Error: Size of the address range of region \"%s\" is not positive.\n",
rom_entries[i].name);
ret = 1;
}
}
return ret;
}
int build_new_image(const struct flashctx *flash, uint8_t *oldcontents, uint8_t *newcontents)
{
unsigned int start = 0;
romentry_t *entry;