diff options
Diffstat (limited to 'pkg/sentry/loader/elf.go')
| -rw-r--r-- | pkg/sentry/loader/elf.go | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/pkg/sentry/loader/elf.go b/pkg/sentry/loader/elf.go index d4610ec3b..98af2cc38 100644 --- a/pkg/sentry/loader/elf.go +++ b/pkg/sentry/loader/elf.go @@ -194,6 +194,10 @@ func parseHeader(ctx context.Context, f fullReader) (elfInfo, error) { log.Infof("Too many phdrs (%d): total size %d > %d", hdr.Phnum, totalPhdrSize, maxTotalPhdrSize) return elfInfo{}, syserror.ENOEXEC } + if int64(hdr.Phoff) < 0 || int64(hdr.Phoff+uint64(totalPhdrSize)) < 0 { + ctx.Infof("Unsupported phdr offset %d", hdr.Phoff) + return elfInfo{}, syserror.ENOEXEC + } phdrBuf := make([]byte, totalPhdrSize) _, err = f.ReadFull(ctx, usermem.BytesIOSequence(phdrBuf), int64(hdr.Phoff)) @@ -437,6 +441,10 @@ func loadParsedELF(ctx context.Context, m *mm.MemoryManager, f fsbridge.File, in ctx.Infof("PT_INTERP path too big: %v", phdr.Filesz) return loadedELF{}, syserror.ENOEXEC } + if int64(phdr.Off) < 0 || int64(phdr.Off+phdr.Filesz) < 0 { + ctx.Infof("Unsupported PT_INTERP offset %d", phdr.Off) + return loadedELF{}, syserror.ENOEXEC + } path := make([]byte, phdr.Filesz) _, err := f.ReadFull(ctx, usermem.BytesIOSequence(path), int64(phdr.Off)) |