yi chen
b9c9c238e8
romfs_seek() clamps the computed position to the file size when it exceeds rf_size, but never checks for a negative result. lseek(fd, offset, SEEK_SET/SEEK_CUR/SEEK_END) with an offset that produces a negative position (e.g. a negative SEEK_SET offset, or a SEEK_CUR/ SEEK_END offset more negative than the current position/file size) is written straight into filep->f_pos. The subsequent romfs_read() computes `rf->rf_startoffset + filep->f_pos` into a uint32_t, so a negative f_pos wraps around to a huge unsigned offset, and romfs_hwread()'s XIP path memcpy()s from rm_xipbase plus that offset -- an out-of-bounds read far past the mapped flash region. Add the same "if (position < 0) return -EINVAL" guard already used by fs/fat/fs_fat32.c's seek function, before the existing end-of-file clamp. Signed-off-by: yi chen <94xhn1@gmail.com> Assisted-by: Claude:claude-sonnet-5
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
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