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common: bootm: add checks to verify if ramdisk / fdtimage overlaps OS image

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These cases are typically fatal and are difficult to debug for random
users. Add checks for detecting overlapping images and abort if overlap
is detected.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
This commit is contained in:
Tero Kristo 2020-06-12 15:41:20 +03:00 committed by Tom Rini
parent 19c6808d87
commit fbde7589ce
5 changed files with 33 additions and 7 deletions
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2
cmd/booti.c
View file

@ -93,7 +93,7 @@ static int booti_start(struct cmd_tbl *cmdtp, int flag, int argc,
* Handle the BOOTM_STATE_FINDOTHER state ourselves as we do not
* have a header that provide this informaiton.
*/
if (bootm_find_images(flag, argc, argv))
if (bootm_find_images(flag, argc, argv, relocated_addr, image_size))
return 1;
return 0;

2
cmd/bootz.c
View file

@ -54,7 +54,7 @@ static int bootz_start(struct cmd_tbl *cmdtp, int flag, int argc,
* Handle the BOOTM_STATE_FINDOTHER state ourselves as we do not
* have a header that provide this informaiton.
*/
if (bootm_find_images(flag, argc, argv))
if (bootm_find_images(flag, argc, argv, zi_start, zi_end - zi_start))
return 1;
return 0;

29
common/bootm.c
View file

@ -228,6 +228,8 @@ static int bootm_find_os(struct cmd_tbl *cmdtp, int flag, int argc,
* @flag: Ignored Argument
* @argc: command argument count
* @argv: command argument list
* @start: OS image start address
* @size: OS image size
*
* boot_find_images() will attempt to load an available ramdisk,
* flattened device tree, as well as specifically marked
@ -239,7 +241,8 @@ static int bootm_find_os(struct cmd_tbl *cmdtp, int flag, int argc,
* 0, if all existing images were loaded correctly
* 1, if an image is found but corrupted, or invalid
*/
int bootm_find_images(int flag, int argc, char *const argv[])
int bootm_find_images(int flag, int argc, char *const argv[], ulong start,
ulong size)
{
int ret;
@ -251,6 +254,16 @@ int bootm_find_images(int flag, int argc, char *const argv[])
return 1;
}
/* check if ramdisk overlaps OS image */
if (images.rd_start && (((ulong)images.rd_start >= start &&
(ulong)images.rd_start <= start + size) ||
((ulong)images.rd_end >= start &&
(ulong)images.rd_end <= start + size))) {
printf("ERROR: RD image overlaps OS image (OS=0x%lx..0x%lx)\n",
start, start + size);
return 1;
}
#if IMAGE_ENABLE_OF_LIBFDT
/* find flattened device tree */
ret = boot_get_fdt(flag, argc, argv, IH_ARCH_DEFAULT, &images,
@ -259,6 +272,18 @@ int bootm_find_images(int flag, int argc, char *const argv[])
puts("Could not find a valid device tree\n");
return 1;
}
/* check if FDT overlaps OS image */
if (images.ft_addr &&
(((ulong)images.ft_addr >= start &&
(ulong)images.ft_addr <= start + size) ||
((ulong)images.ft_addr + images.ft_len >= start &&
(ulong)images.ft_addr + images.ft_len <= start + size))) {
printf("ERROR: FDT image overlaps OS image (OS=0x%lx..0x%lx)\n",
start, start + size);
return 1;
}
if (CONFIG_IS_ENABLED(CMD_FDT))
set_working_fdt_addr(map_to_sysmem(images.ft_addr));
#endif
@ -294,7 +319,7 @@ static int bootm_find_other(struct cmd_tbl *cmdtp, int flag, int argc,
(images.os.type == IH_TYPE_MULTI)) &&
(images.os.os == IH_OS_LINUX ||
images.os.os == IH_OS_VXWORKS))
return bootm_find_images(flag, argc, argv);
return bootm_find_images(flag, argc, argv, 0, 0);
return 0;
}

4
common/bootm_os.c
View file

@ -495,7 +495,7 @@ static int do_bootm_tee(int flag, int argc, char *const argv[],
return ret;
/* Locate FDT etc */
ret = bootm_find_images(flag, argc, argv);
ret = bootm_find_images(flag, argc, argv, 0, 0);
if (ret)
return ret;
@ -516,7 +516,7 @@ static int do_bootm_efi(int flag, int argc, char *const argv[],
return 0;
/* Locate FDT, if provided */
ret = bootm_find_images(flag, argc, argv);
ret = bootm_find_images(flag, argc, argv, 0, 0);
if (ret)
return ret;

3
include/bootm.h
View file

@ -53,7 +53,8 @@ int boot_selected_os(int argc, char *const argv[], int state,
ulong bootm_disable_interrupts(void);
/* This is a special function used by booti/bootz */
int bootm_find_images(int flag, int argc, char *const argv[]);
int bootm_find_images(int flag, int argc, char *const argv[], ulong start,
ulong size);
int do_bootm_states(struct cmd_tbl *cmdtp, int flag, int argc,
char *const argv[], int states, bootm_headers_t *images,