Anders Roxell 966866892c arm64: kprobe: make page to RO mode when allocate it ... Commit 1404d6f13e ("arm64: dump: Add checking for writable and exectuable pages") has successfully identified code that leaves a page with W+X permissions. [ 3.245140] arm64/mm: Found insecure W+X mapping at address (____ptrval____)/0xffff000000d90000 [ 3.245771] WARNING: CPU: 0 PID: 1 at ../arch/arm64/mm/dump.c:232 note_page+0x410/0x420 [ 3.246141] Modules linked in: [ 3.246653] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.0-rc5-next-20180928-00001-ge70ae259b853-dirty #62 [ 3.247008] Hardware name: linux,dummy-virt (DT) [ 3.247347] pstate: 80000005 (Nzcv daif -PAN -UAO) [ 3.247623] pc : note_page+0x410/0x420 [ 3.247898] lr : note_page+0x410/0x420 [ 3.248071] sp : ffff00000804bcd0 [ 3.248254] x29: ffff00000804bcd0 x28: ffff000009274000 [ 3.248578] x27: ffff00000921a000 x26: ffff80007dfff000 [ 3.248845] x25: ffff0000093f5000 x24: ffff000009526f6a [ 3.249109] x23: 0000000000000004 x22: ffff000000d91000 [ 3.249396] x21: ffff000000d90000 x20: 0000000000000000 [ 3.249661] x19: ffff00000804bde8 x18: 0000000000000400 [ 3.249924] x17: 0000000000000000 x16: 0000000000000000 [ 3.250271] x15: ffffffffffffffff x14: 295f5f5f5f6c6176 [ 3.250594] x13: 7274705f5f5f5f28 x12: 2073736572646461 [ 3.250941] x11: 20746120676e6970 x10: 70616d20582b5720 [ 3.251252] x9 : 6572756365736e69 x8 : 3039643030303030 [ 3.251519] x7 : 306666666678302f x6 : ffff0000095467b2 [ 3.251802] x5 : 0000000000000000 x4 : 0000000000000000 [ 3.252060] x3 : 0000000000000000 x2 : ffffffffffffffff [ 3.252323] x1 : 4d151327adc50b00 x0 : 0000000000000000 [ 3.252664] Call trace: [ 3.252953] note_page+0x410/0x420 [ 3.253186] walk_pgd+0x12c/0x238 [ 3.253417] ptdump_check_wx+0x68/0xf8 [ 3.253637] mark_rodata_ro+0x68/0x98 [ 3.253847] kernel_init+0x38/0x160 [ 3.254103] ret_from_fork+0x10/0x18 kprobes allocates a writable executable page with module_alloc() in order to store executable code. Reworked to that when allocate a page it sets mode RO. Inspired by commit 63fef14fc9 ("kprobes/x86: Make insn buffer always ROX and use text_poke()"). Suggested-by: Arnd Bergmann <arnd@arndb.de> Suggested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Will Deacon <will.deacon@arm.com> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Reviewed-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Anders Roxell <anders.roxell@linaro.org> [catalin.marinas@arm.com: removed unnecessary casts] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>		2018-11-02 18:15:07 +00:00
..
boot	ARM: SoC: late updates	2018-08-25 14:12:36 -07:00
configs	arm64: defconfig: Enable TI's AM6 SoC platform	2018-08-29 11:51:26 -07:00
crypto	crypto: arm64/aes-gcm-ce - fix scatterwalk API violation	2018-08-25 19:50:43 +08:00
include	arm64: cpufeature: Fix handling of CTR_EL0.IDC field	2018-10-16 11:53:31 +01:00
kernel	arm64: kprobe: make page to RO mode when allocate it	2018-11-02 18:15:07 +00:00
kvm	arm64: KVM: Enable Common Not Private translations	2018-09-18 12:03:34 +01:00
lib	arm64: lse: remove -fcall-used-x0 flag	2018-09-24 10:56:24 +01:00
mm	arm64: mm: Use __pa_symbol() for set_swapper_pgd()	2018-10-10 17:57:06 +01:00
net	bpf, arm64: save 4 bytes in prologue when ebpf insns came from cbpf	2018-05-14 19:11:45 -07:00
xen	arm64: mm: Add additional parameter to uaccess_ttbr0_disable	2018-01-17 13:57:49 +01:00
Kconfig	arm64: arch_timer: avoid unused function warning	2018-10-03 11:41:34 +01:00
Kconfig.debug	Kconfig: consolidate the "Kernel hacking" menu	2018-08-02 08:06:48 +09:00
Kconfig.platforms	ARM: SoC: late updates	2018-08-25 14:12:36 -07:00
Makefile	arm64: makefile fix build of .i file in external module case	2018-11-02 17:16:48 +00:00