CVE-2024-44965 | In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not t
In the Linux kernel, the following vulnerability has been resolved:
x86/mm: Fix pti_clone_pgtable() alignment assumption
Guenter reported dodgy crashes on an i386-nosmp build using GCC-11
that had the form of endless traps until entry stack exhaust and then
#DF from the stack guard.
It turned out that pti_clone_pgtable() had alignment assumptions on
the start address, notably it hard assumes start is PMD aligned. This
is true on x86_64, but very much not true on i386.
These assumptions can cause the end condition to malfunction, leading
to a 'short' clone. Guess what happens when the user mapping has a
short copy of the entry text?
Use the correct increment form for addr to avoid alignment
assumptions.
- 🔗 git.kernel.org/stable/c/18da1b27ce16a14a9b636af9232acb4f…
- 🔗 git.kernel.org/stable/c/25a727233a40a9b33370eec9f0cad67d…
- 🔗 git.kernel.org/stable/c/d00c9b4bbc442d99e1dafbdfdab848bc…
- 🔗 git.kernel.org/stable/c/4d143ae782009b43b4f366402e5c37f5…
- 🔗 git.kernel.org/stable/c/5c580c1050bcbc15c3e78090859d798d…
- 🔗 git.kernel.org/stable/c/ca07aab70dd3b5e7fddb62d7a6ecd7a7…
- 🔗 git.kernel.org/stable/c/df3eecb5496f87263d171b254ca6e275…
- 🔗 git.kernel.org/stable/c/41e71dbb0e0a0fe214545fe64af03130…
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CVE-2024-44965 | In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not t
In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry sta