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Change History

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

bpf, arm64: Fix fp initialization for exception boundary

In the ARM64 BPF JIT when prog->aux->exception_boundary is set for a BPF
program, find_used_callee_regs() is not called because for a program
acting as exception boundary, all callee saved registers are saved.
find_used_callee_regs() sets `ctx->fp_used = true;` when it sees FP
being used in any of the instructions.

For programs acting as exception boundary, ctx->fp_used remains false
even if frame pointer is used by the program and therefore, FP is not
set-up for such programs in the prologue. This can cause the kernel to
crash due to a pagefault.

Fix it by setting ctx->fp_used = true for exception boundary programs as
fp is always saved in such programs.

https://git.kernel.org/stable/c/0dbef493cae7d451f740558665893c000adb2321

https://git.kernel.org/stable/c/1ce30231e0a2c8c361ee5f8f7f265fc17130adce

https://git.kernel.org/stable/c/b114fcee766d5101eada1aca7bb5fd0a86c89b35

https://git.kernel.org/stable/c/e23184725dbb72d5d02940222eee36dbba2aa422