In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
dm: fix a buffer overflow in ioctl processing<\/p>\n
Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the
\nfunction retrieve_status:<\/p>\n
1. The code in retrieve_status checks that the output string fits into
\n the output buffer and writes the output string there
\n2. Then, the code aligns the “outptr” variable to the next 8-byte
\n boundary:
\n\toutptr = align_ptr(outptr);
\n3. The alignment doesn’t check overflow, so outptr could point past the
\n buffer end
\n4. The “for” loop is iterated again, it executes:
\n\tremaining = len – (outptr – outbuf);
\n5. If “outptr” points past “outbuf + len”, the arithmetics wraps around
\n and the variable “remaining” contains unusually high number
\n6. With “remaining” being high, the code writes more data past the end of
\n the buffer<\/p>\n
Luckily, this bug has no security implications because:
\n1. Only root can issue device mapper ioctls
\n2. The commonly used libraries that communicate with device mapper
\n (libdevmapper and devicemapper-rs) use buffer size that is aligned to
\n 8 bytes – thus, “outptr = align_ptr(outptr)” can’t overshoot the input
\n buffer and the bug can’t happen accidentally<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
dm: fix a buffer overflow in ioctl processing<\/p>\n
Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the
\nfunction retr<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-15995","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/15995","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=15995"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=15995"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=15995"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}