diff options
| author | Philip Paeps <philip@FreeBSD.org> | 2021-05-27 05:17:01 +0000 |
|---|---|---|
| committer | Philip Paeps <philip@FreeBSD.org> | 2021-05-27 05:17:36 +0000 |
| commit | 23f6f30d5c54472a4039759ebb031ea4518b8c0b (patch) | |
| tree | 1be2204feb82d053f6602d0741390f8dd27e616c | |
| parent | 8a139f445dcbba03236e7af4cd8091957bc1dba9 (diff) | |
security/vuxml: add FreeBSD SA-21:11.smap
| -rw-r--r-- | security/vuxml/vuln.xml | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/security/vuxml/vuln.xml b/security/vuxml/vuln.xml index 122fd9f8865e..2183734a60a3 100644 --- a/security/vuxml/vuln.xml +++ b/security/vuxml/vuln.xml @@ -76,6 +76,46 @@ Notes: * Do not forget port variants (linux-f10-libxml2, libxml2, etc.) --> <vuxml xmlns="http://www.vuxml.org/apps/vuxml-1"> + <vuln vid="d1ac6a6a-bea8-11eb-b87a-901b0ef719ab"> + <topic>FreeBSD-kernel -- SMAP bypass</topic> + <affects> + <package> + <name>FreeBSD-kernel</name> + <range><ge>13.0</ge><lt>13.0_1</lt></range> + <range><ge>12.2</ge><lt>12.2_7</lt></range> + </package> + </affects> + <description> + <body xmlns="http://www.w3.org/1999/xhtml"> + <h1>Problem Description:</h1> + <p>The FreeBSD kernel enables SMAP during boot when the CPU reports that + the SMAP capability is present. Subroutines such as copyin() and + copyout() are responsible for disabling SMAP around the sections of code + that perform user memory accesses.</p> + <p>Such subroutines must handle page faults triggered when user memory is + not mapped. The kernel's page fault handler checks the validity of the + fault, and if it is indeed valid it will map a page and resume copying. + If the fault is invalid, the fault handler returns control to a + trampoline which aborts the operation and causes an error to be + returned. In this second scenario, a bug in the implementation of SMAP + support meant that SMAP would remain disabled until the thread returns + to user mode.</p> + <h1>Impact:</h1> + <p>This bug may be used to bypass the protections provided by SMAP for the + duration of a system call. It could thus be combined with other kernel + bugs to craft an exploit.</p> + </body> + </description> + <references> + <cvename>CVE-2021-29628</cvename> + <freebsdsa>SA-21:11.smap</freebsdsa> + </references> + <dates> + <discovery>2021-05-27</discovery> + <entry>2021-05-27</entry> + </dates> + </vuln> + <vuln vid="674ed047-be0a-11eb-b927-3065ec8fd3ec"> <topic>chromium -- multiple vulnerabilities</topic> <affects> |