Xin LI
c4f458da44
Exercise each of the 32-bit BIOS Parameter Block and FSInfo fields that readboot() decodes, using values whose most significant byte has its high bit set. Each case checks two things: that fsck_msdosfs(8) reports the full unsigned 32-bit value back on stdout, and that nothing writes a sanitizer runtime error to stderr. The second check is what catches a byte-at-a-time decode. Shifting such a byte left by 24 is undefined, but every compiler we use wraps it into the same bit pattern, so the decoded value alone cannot tell a correct decode from an overflowing one. In a WITH_UBSAN build bsd.sanitizer.mk compiles with -fsanitize=undefined and -fsanitize-recover=undefined, so the shift is reported on stderr and execution continues, which the test can then assert on. Against the byte-at-a-time decode these cases fail in a WITH_UBSAN build and pass without it. Note that the stderr check also fails on unrelated undefined behavior that these images reach anywhere in fsck_msdosfs(8), which is intended. MFC after: 1 week
FreeBSD Source:
This is the top level of the FreeBSD source directory.
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Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.