[PATCH] arm64: Fix text patching logic when using fixmap
From: Jon Masters <hidden>
Date: 2015-02-27 13:25:16
On 02/24/2015 11:30 AM, Marc Zyngier wrote:
Patch 2f896d586610 ("arm64: use fixmap for text patching") changed
the way we patch the kernel text, using a fixmap when the kernel or
modules are flagged as read only.
Unfortunately, a flaw in the logic makes it fall over when patching
modules without CONFIG_DEBUG_SET_MODULE_RONX enabled:
[...]
[ 32.032636] Call trace:
[ 32.032716] [<fffffe00003da0dc>] __copy_to_user+0x2c/0x60
[ 32.032837] [<fffffe0000099f08>] __aarch64_insn_write+0x94/0xf8
[ 32.033027] [<fffffe000009a0a0>] aarch64_insn_patch_text_nosync+0x18/0x58
[ 32.033200] [<fffffe000009c3ec>] ftrace_modify_code+0x58/0x84
[ 32.033363] [<fffffe000009c4e4>] ftrace_make_nop+0x3c/0x58
[ 32.033532] [<fffffe0000164420>] ftrace_process_locs+0x3d0/0x5c8
[ 32.033709] [<fffffe00001661cc>] ftrace_module_init+0x28/0x34
[ 32.033882] [<fffffe0000135148>] load_module+0xbb8/0xfc4
[ 32.034044] [<fffffe0000135714>] SyS_finit_module+0x94/0xc4
[...]
This is triggered by the use of virt_to_page() on a module address,
which ends to pointing to Nowhereland if you're lucky, or corrupt
your precious data if not.
This patch fixes the logic by mimicking what is done on arm:
- If we're patching a module and CONFIG_DEBUG_SET_MODULE_RONX is set,
use vmalloc_to_page().
- If we're patching the kernel and CONFIG_DEBUG_RODATA is set,
use virt_to_page().
- Otherwise, use the provided address, as we can write to it directly.
Tested on 4.0-rc1 as a KVM guest.
Reported-by: Richard W.M. Jones <redacted>
Cc: Kees Cook <redacted>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Laura Abbott <redacted>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <redacted>
Signed-off-by: Marc Zyngier <redacted>This fixes a crash on boot in the AHCI driver experienced by a test Fedora Hosted arm64 kernel when running on various platforms. Tested by me on AMD Seattle and confirmed fixing the issue. Tested-by: Jon Masters <redacted>
quoted hunk ↗ jump to hunk
--- arch/arm64/kernel/insn.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)diff --git a/arch/arm64/kernel/insn.c b/arch/arm64/kernel/insn.c index 27d4864..c8eca88 100644 --- a/arch/arm64/kernel/insn.c +++ b/arch/arm64/kernel/insn.c@@ -87,8 +87,10 @@ static void __kprobes *patch_map(void *addr, int fixmap) if (module && IS_ENABLED(CONFIG_DEBUG_SET_MODULE_RONX)) page = vmalloc_to_page(addr); - else + else if (!module && IS_ENABLED(CONFIG_DEBUG_RODATA)) page = virt_to_page(addr); + else + return addr; BUG_ON(!page); set_fixmap(fixmap, page_to_phys(page));