diff options
| -rw-r--r-- | arch/powerpc/include/asm/nohash/32/mmu-44x.h | 1 | ||||
| -rw-r--r-- | arch/powerpc/kernel/head_44x.S | 8 | ||||
| -rw-r--r-- | arch/powerpc/mm/nohash/44x.c | 13 | ||||
| -rw-r--r-- | arch/powerpc/platforms/Kconfig.cputype | 1 |
4 files changed, 23 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/nohash/32/mmu-44x.h b/arch/powerpc/include/asm/nohash/32/mmu-44x.h index 2d92a39d8f2e..43ceca128531 100644 --- a/arch/powerpc/include/asm/nohash/32/mmu-44x.h +++ b/arch/powerpc/include/asm/nohash/32/mmu-44x.h @@ -113,6 +113,7 @@ typedef struct { /* patch sites */ extern s32 patch__tlb_44x_hwater_D, patch__tlb_44x_hwater_I; +extern s32 patch__tlb_44x_kuep, patch__tlb_47x_kuep; #endif /* !__ASSEMBLY__ */ diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S index 5c106ac36626..2cfb496df615 100644 --- a/arch/powerpc/kernel/head_44x.S +++ b/arch/powerpc/kernel/head_44x.S @@ -532,6 +532,10 @@ finish_tlb_load_44x: andi. r10,r12,_PAGE_USER /* User page ? */ beq 1f /* nope, leave U bits empty */ rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */ +#ifdef CONFIG_PPC_KUEP +0: rlwinm r11,r11,0,~PPC44x_TLB_SX /* Clear SX if User page */ + patch_site 0b, patch__tlb_44x_kuep +#endif 1: tlbwe r11,r13,PPC44x_TLB_ATTRIB /* Write ATTRIB */ /* Done...restore registers and get out of here. @@ -743,6 +747,10 @@ finish_tlb_load_47x: andi. r10,r12,_PAGE_USER /* User page ? */ beq 1f /* nope, leave U bits empty */ rlwimi r11,r11,3,26,28 /* yes, copy S bits to U */ +#ifdef CONFIG_PPC_KUEP +0: rlwinm r11,r11,0,~PPC47x_TLB2_SX /* Clear SX if User page */ + patch_site 0b, patch__tlb_47x_kuep +#endif 1: tlbwe r11,r13,2 /* Done...restore registers and get out of here. diff --git a/arch/powerpc/mm/nohash/44x.c b/arch/powerpc/mm/nohash/44x.c index 3d6ae7c72412..7da6d1e9fc9b 100644 --- a/arch/powerpc/mm/nohash/44x.c +++ b/arch/powerpc/mm/nohash/44x.c @@ -239,3 +239,16 @@ void __init mmu_init_secondary(int cpu) } } #endif /* CONFIG_SMP */ + +#ifdef CONFIG_PPC_KUEP +void __init setup_kuep(bool disabled) +{ + if (disabled) + patch_instruction_site(&patch__tlb_44x_kuep, ppc_inst(PPC_RAW_NOP())); + else + pr_info("Activating Kernel Userspace Execution Prevention\n"); + + if (IS_ENABLED(CONFIG_PPC_47x) && disabled) + patch_instruction_site(&patch__tlb_47x_kuep, ppc_inst(PPC_RAW_NOP())); +} +#endif diff --git a/arch/powerpc/platforms/Kconfig.cputype b/arch/powerpc/platforms/Kconfig.cputype index dc7c46f92302..d4acba7551c2 100644 --- a/arch/powerpc/platforms/Kconfig.cputype +++ b/arch/powerpc/platforms/Kconfig.cputype @@ -61,6 +61,7 @@ config 44x select 4xx_SOC select HAVE_PCI select PHYS_64BIT + select PPC_HAVE_KUEP endchoice |