From 4cd7ed94428babb0cdbf08cc14c257e223186079 Mon Sep 17 00:00:00 2001 From: Paolo 'Blaisorblade' Giarrusso Date: Wed, 1 Feb 2006 03:06:28 -0800 Subject: [PATCH] [PATCH] uml: skas0-hold-own-ldt fixups for x86-64 In a recent fixup i386 code was copied raw to x86_64 subarch to make it compile again. Here there are some little fixups and resyncs needed for it (mainly for cleanliness sake) - I did an audit and found the rest of the code to be safe. Signed-off-by: Paolo 'Blaisorblade' Giarrusso Cc: Jeff Dike Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-um/ldt-x86_64.h | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/include/asm-um/ldt-x86_64.h b/include/asm-um/ldt-x86_64.h index 57159f12dde2..96b35aada79a 100644 --- a/include/asm-um/ldt-x86_64.h +++ b/include/asm-um/ldt-x86_64.h @@ -39,11 +39,13 @@ typedef struct uml_ldt { } uml_ldt_t; /* - * macros stolen from include/asm-i386/desc.h + * macros stolen from include/asm-x86_64/desc.h */ #define LDT_entry_a(info) \ ((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff)) +/* Don't allow setting of the lm bit. It is useless anyways because + * 64bit system calls require __USER_CS. */ #define LDT_entry_b(info) \ (((info)->base_addr & 0xff000000) | \ (((info)->base_addr & 0x00ff0000) >> 16) | \ @@ -54,6 +56,7 @@ typedef struct uml_ldt { ((info)->seg_32bit << 22) | \ ((info)->limit_in_pages << 23) | \ ((info)->useable << 20) | \ + /* ((info)->lm << 21) | */ \ 0x7000) #define LDT_empty(info) (\ @@ -64,6 +67,7 @@ typedef struct uml_ldt { (info)->seg_32bit == 0 && \ (info)->limit_in_pages == 0 && \ (info)->seg_not_present == 1 && \ - (info)->useable == 0 ) + (info)->useable == 0 && \ + (info)->lm == 0) #endif -- GitLab