Vulnerability CVE-2024-39480
Published: 2024-07-05

Description:
In the Linux kernel, the following vulnerability has been resolved:

kdb: Fix buffer overflow during tab-complete

Currently, when the user attempts symbol completion with the Tab key, kdb
will use strncpy() to insert the completed symbol into the command buffer.
Unfortunately it passes the size of the source buffer rather than the
destination to strncpy() with predictably horrible results. Most obviously
if the command buffer is already full but cp, the cursor position, is in
the middle of the buffer, then we will write past the end of the supplied
buffer.

Fix this by replacing the dubious strncpy() calls with memmove()/memcpy()
calls plus explicit boundary checks to make sure we have enough space
before we start moving characters around.

 References:
https://git.kernel.org/stable/c/fb824a99e148ff272a53d71d84122728b5f00992
https://git.kernel.org/stable/c/ddd2972d8e2dee3b33e8121669d55def59f0be8a
https://git.kernel.org/stable/c/cfdc2fa4db57503bc6d3817240547c8ddc55fa96
https://git.kernel.org/stable/c/f636a40834d22e5e3fc748f060211879c056cd33
https://git.kernel.org/stable/c/33d9c814652b971461d1e30bead6792851c209e7
https://git.kernel.org/stable/c/107e825cc448b7834b31e8b1b3cf0f57426d46d5
https://git.kernel.org/stable/c/f694da720dcf795dc3eb97bf76d220213f76aaa7
https://git.kernel.org/stable/c/e9730744bf3af04cda23799029342aa3cddbc454
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