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7cc5cb8083
mlock(2) and munlock(2) operate on memory pages whereas malloc(3) does not. So if you munlock(2) a malloced memory region, the whole page containing it is freed. Since this page may contain another malloced and mlocked memory region, used as a password buffer by a concurrent running instance of pam_zfs_key, there is a slight chance of leaking passwords. By using mmap(2) we avoid such problems since it will return whole pages on page aligned addresses. Although the above concern may be mostly academical, it is still better to use mmap(2) for allocating memory since the FreeBSD documentation suggests to call mlock(2) and munlock(2) on page aligned addresses, and other implementations even require it. While here, remove duplicate code in alloc_pw_string() by calling alloc_pw_size(). Reviewed-by: Felix Dörre <felix@dogcraft.de> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Attila Fülöp <attila@fueloep.org> Closes #12665 |
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| dracut | ||
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| pam_zfs_key | ||
| pyzfs | ||
| zcp | ||
| Makefile.am | ||