diff options
Diffstat (limited to 'arch/x86/vdso')
| -rw-r--r-- | arch/x86/vdso/vdso.S | 1 | ||||
| -rw-r--r-- | arch/x86/vdso/vdso32/sysenter.S | 2 | ||||
| -rw-r--r-- | arch/x86/vdso/vma.c | 9 |
3 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/vdso/vdso.S b/arch/x86/vdso/vdso.S index 1b979c12ba85..01f5e3b4613c 100644 --- a/arch/x86/vdso/vdso.S +++ b/arch/x86/vdso/vdso.S @@ -9,6 +9,7 @@ __PAGE_ALIGNED_DATA vdso_start: .incbin "arch/x86/vdso/vdso.so" vdso_end: + .align PAGE_SIZE /* extra data here leaks to userspace. */ .previous diff --git a/arch/x86/vdso/vdso32/sysenter.S b/arch/x86/vdso/vdso32/sysenter.S index e2800affa754..e354bceee0e0 100644 --- a/arch/x86/vdso/vdso32/sysenter.S +++ b/arch/x86/vdso/vdso32/sysenter.S @@ -43,7 +43,7 @@ __kernel_vsyscall: .space 7,0x90 /* 14: System call restart point is here! (SYSENTER_RETURN-2) */ - jmp .Lenter_kernel + int $0x80 /* 16: System call normal return point is here! */ VDSO32_SYSENTER_RETURN: /* Symbol used by sysenter.c via vdso32-syms.h */ pop %ebp diff --git a/arch/x86/vdso/vma.c b/arch/x86/vdso/vma.c index 316fbca3490e..153407c35b75 100644 --- a/arch/x86/vdso/vma.c +++ b/arch/x86/vdso/vma.c @@ -89,6 +89,15 @@ static unsigned long vdso_addr(unsigned long start, unsigned len) addr = start + (offset << PAGE_SHIFT); if (addr >= end) addr = end; + + /* + * page-align it here so that get_unmapped_area doesn't + * align it wrongfully again to the next page. addr can come in 4K + * unaligned here as a result of stack start randomization. + */ + addr = PAGE_ALIGN(addr); + addr = align_addr(addr, NULL, ALIGN_VDSO); + return addr; } |