CVE-2024-50099

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

arm64: probes: Remove broken LDR (literal) uprobe support

The simulate_ldr_literal() and simulate_ldrsw_literal() functions are

unsafe to use for uprobes. Both functions were originally written for

use with kprobes, and access memory with plain C accesses. When uprobes

was added, these were reused unmodified even though they cannot safely

access user memory.

There are three key problems:

1) The plain C accesses do not have corresponding extable entries, and

thus if they encounter a fault the kernel will treat these as

unintentional accesses to user memory, resulting in a BUG() which

will kill the kernel thread, and likely lead to further issues (e.g.

lockup or panic()).

2) The plain C accesses are subject to HW PAN and SW PAN, and so when

either is in use, any attempt to simulate an access to user memory

will fault. Thus neither simulate_ldr_literal() nor

simulate_ldrsw_literal() can do anything useful when simulating a

user instruction on any system with HW PAN or SW PAN.

3) The plain C accesses are privileged, as they run in kernel context,

and in practice can access a small range of kernel virtual addresses.

The instructions they simulate have a range of +/-1MiB, and since the

simulated instructions must itself be a user instructions in the

TTBR0 address range, these can address the final 1MiB of the TTBR1

acddress range by wrapping downwards from an address in the first

1MiB of the TTBR0 address range.

In contemporary kernels the last 8MiB of TTBR1 address range is

reserved, and accesses to this will always fault, meaning this is no

worse than (1).

Historically, it was theoretically possible for the linear map or

vmemmap to spill into the final 8MiB of the TTBR1 address range, but

in practice this is extremely unlikely to occur as this would

require either:

* Having enough physical memory to fill the entire linear map all the

way to the final 1MiB of the TTBR1 address range.

* Getting unlucky with KASLR randomization of the linear map such

that the populated region happens to overlap with the last 1MiB of

the TTBR address range.

... and in either case if we were to spill into the final page there

would be larger problems as the final page would alias with error

pointers.

Practically speaking, (1) and (2) are the big issues. Given there have

been no reports of problems since the broken code was introduced, it

appears that no-one is relying on probing these instructions with

uprobes.

Avoid these issues by not allowing uprobes on LDR (literal) and LDRSW

(literal), limiting the use of simulate_ldr_literal() and

simulate_ldrsw_literal() to kprobes. Attempts to place uprobes on LDR

(literal) and LDRSW (literal) will be rejected as

arm_probe_decode_insn() will return INSN_REJECTED. In future we can

consider introducing working uprobes support for these instructions, but

this will require more significant work.