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fw: Limit flash offsets to be within sane limits

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Limit flash offsets passed to syscalls. Be sure to check the limits
before doing any form of calculation with the passed values.

Co-authored-by: Mikael Ågren <mikael@tillitis.se>
This commit is contained in:
Michael Cardell Widerkrantz 2025-04-25 15:16:41 +02:00
parent 506b4c8269
commit 632b6d8fc7
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GPG key ID: D3DB3DDF57E704E5
2 changed files with 30 additions and 2 deletions
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10
hw/application_fpga/fw/tk1/preload_app.c
View file

@ -67,7 +67,15 @@ int preload_store(struct partition_table *part_table, uint32_t offset,
return -1;
}
if ((offset + size) > SIZE_PRE_LOADED_APP || size > 4096) {
if (offset > SIZE_PRE_LOADED_APP) {
return -2;
}
if (size > 4096) {
return -2;
}
if ((offset + size) > SIZE_PRE_LOADED_APP) {
/* Writing outside of area */
return -2;
}

22
hw/application_fpga/fw/tk1/storage.c
View file

@ -176,6 +176,10 @@ int storage_erase_sector(struct partition_table *part_table, uint32_t offset,
return -3;
}
if (offset > SIZE_STORAGE_AREA) {
return -2;
}
/* Cannot only erase entire sectors */
if (offset % 4096 != 0) {
return -2;
@ -227,7 +231,15 @@ int storage_write_data(struct partition_table *part_table, uint32_t offset,
return -3;
}
if ((offset + size) > SIZE_STORAGE_AREA || size > 4096) {
if (offset > SIZE_STORAGE_AREA) {
return -2;
}
if (size > 4096) {
return -2;
}
if ((offset + size) > SIZE_STORAGE_AREA) {
/* Writing outside of area */
return -2;
}
@ -263,6 +275,14 @@ int storage_read_data(struct partition_table *part_table, uint32_t offset,
return -3;
}
if (offset > SIZE_STORAGE_AREA) {
return -2;
}
if (size > 4096) {
return -2;
}
if ((offset + size) > SIZE_STORAGE_AREA) {
/* Reading outside of area */
return -2;