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Stricter checking for ExeFS files

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fixes #321
This commit is contained in:
d0k3 2018-03-07 01:22:15 +01:00
parent 67e19ad574
commit 4087a2a2d7
1 changed files with 2 additions and 0 deletions
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2
arm9/source/game/exefs.c
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@ -9,9 +9,11 @@ u32 ValidateExeFsHeader(ExeFsHeader* exefs, u32 size) {
ExeFsFileHeader* file = exefs->files + i; ExeFsFileHeader* file = exefs->files + i;
u8* hash = exefs->hashes[9 - i]; u8* hash = exefs->hashes[9 - i];
if (file->size == 0) continue; if (file->size == 0) continue;
if (!*(file->name)) return 1; // zero filename -> not a valid ExeFS
if (file->offset % NCCH_MEDIA_UNIT) return 1; // not aligned to media unit, failed if (file->offset % NCCH_MEDIA_UNIT) return 1; // not aligned to media unit, failed
if (file->offset < data_size) return 1; // overlapping data, failed if (file->offset < data_size) return 1; // overlapping data, failed
if (memcmp(hash, zeroes, 32) == 0) return 1; // hash not set, failed if (memcmp(hash, zeroes, 32) == 0) return 1; // hash not set, failed
if (file->size >= 0xFFFFFE00) return 1; // obviously an improper value, failed
data_size = file->offset + align(file->size, NCCH_MEDIA_UNIT); data_size = file->offset + align(file->size, NCCH_MEDIA_UNIT);
n_files++; n_files++;
} }