From 233b2ca181f20674ecad11be90b00814911ce345 Mon Sep 17 00:00:00 2001 From: James Hogan Date: Mon, 25 Jul 2016 16:59:50 +0100 Subject: MIPS: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO AT_VECTOR_SIZE_ARCH should be defined with the maximum number of NEW_AUX_ENT entries that ARCH_DLINFO can contain, but it wasn't defined for MIPS at all even though ARCH_DLINFO will contain one NEW_AUX_ENT for the VDSO address. This shouldn't be a problem as AT_VECTOR_SIZE_BASE includes space for AT_BASE_PLATFORM which MIPS doesn't use, but lets define it now and add the comment above ARCH_DLINFO as found in several other architectures to remind future modifiers of ARCH_DLINFO to keep AT_VECTOR_SIZE_ARCH up to date. Fixes: ebb5e78cc634 ("MIPS: Initial implementation of a VDSO") Signed-off-by: James Hogan Cc: linux-mips@linux-mips.org Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/13823/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/elf.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/mips/include/asm/elf.h') diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h index f5f45717968e..ede8c4ff56f7 100644 --- a/arch/mips/include/asm/elf.h +++ b/arch/mips/include/asm/elf.h @@ -458,6 +458,7 @@ extern const char *__elf_platform; #define ELF_ET_DYN_BASE (TASK_SIZE / 3 * 2) #endif +/* update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT entries changes */ #define ARCH_DLINFO \ do { \ NEW_AUX_ENT(AT_SYSINFO_EHDR, \ -- cgit v1.2.3 From 1a770b85c1f1c1ee37afd7cef5237ffc4c970f04 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Fri, 8 Jul 2016 11:06:20 +0100 Subject: MIPS: non-exec stack & heap when non-exec PT_GNU_STACK is present The stack and heap have both been executable by default on MIPS until now. This patch changes the default to be non-executable, but only for ELF binaries with a non-executable PT_GNU_STACK header present. This does apply to both the heap & the stack, despite the name PT_GNU_STACK, and this matches the behaviour of other architectures like ARM & x86. Current MIPS toolchains do not produce the PT_GNU_STACK header, which means that we can rely upon this patch not changing the behaviour of existing binaries. The new default will only take effect for newly compiled binaries once toolchains are updated to support PT_GNU_STACK, and since those binaries are newly compiled they can be compiled expecting the change in default behaviour. Again this matches the way in which the ARM & x86 architectures handled their implementations of non-executable memory. Signed-off-by: Paul Burton Cc: Leonid Yegoshin Cc: Maciej Rozycki Cc: Faraz Shahbazker Cc: Raghu Gandham Cc: Matthew Fortune Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/13765/ Signed-off-by: Ralf Baechle --- arch/mips/include/asm/elf.h | 3 +++ arch/mips/include/asm/page.h | 6 ++++-- arch/mips/kernel/elf.c | 19 +++++++++++++++++++ 3 files changed, 26 insertions(+), 2 deletions(-) (limited to 'arch/mips/include/asm/elf.h') diff --git a/arch/mips/include/asm/elf.h b/arch/mips/include/asm/elf.h index ede8c4ff56f7..2b3dc2973670 100644 --- a/arch/mips/include/asm/elf.h +++ b/arch/mips/include/asm/elf.h @@ -499,4 +499,7 @@ extern int arch_check_elf(void *ehdr, bool has_interpreter, void *interp_ehdr, extern void mips_set_personality_nan(struct arch_elf_state *state); extern void mips_set_personality_fp(struct arch_elf_state *state); +#define elf_read_implies_exec(ex, stk) mips_elf_read_implies_exec(&(ex), stk) +extern int mips_elf_read_implies_exec(void *elf_ex, int exstack); + #endif /* _ASM_ELF_H */ diff --git a/arch/mips/include/asm/page.h b/arch/mips/include/asm/page.h index 21ed7150fec3..74cb004c2868 100644 --- a/arch/mips/include/asm/page.h +++ b/arch/mips/include/asm/page.h @@ -229,8 +229,10 @@ extern int __virt_addr_valid(const volatile void *kaddr); #define virt_addr_valid(kaddr) \ __virt_addr_valid((const volatile void *) (kaddr)) -#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ - VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) +#define VM_DATA_DEFAULT_FLAGS \ + (VM_READ | VM_WRITE | \ + ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) #define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE) #define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET) diff --git a/arch/mips/kernel/elf.c b/arch/mips/kernel/elf.c index 891f5ee63983..824b0373ba71 100644 --- a/arch/mips/kernel/elf.c +++ b/arch/mips/kernel/elf.c @@ -8,9 +8,12 @@ * option) any later version. */ +#include #include +#include #include +#include #include /* Whether to accept legacy-NaN and 2008-NaN user binaries. */ @@ -326,3 +329,19 @@ void mips_set_personality_nan(struct arch_elf_state *state) BUG(); } } + +int mips_elf_read_implies_exec(void *elf_ex, int exstack) +{ + if (exstack != EXSTACK_DISABLE_X) { + /* The binary doesn't request a non-executable stack */ + return 1; + } + + if (!cpu_has_rixi) { + /* The CPU doesn't support non-executable memory */ + return 1; + } + + return 0; +} +EXPORT_SYMBOL(mips_elf_read_implies_exec); -- cgit v1.2.3