diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2016-12-10 02:13:51 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2016-12-10 02:24:39 +0300 |
| commit | 990e9dc381e6999a0eba8ebaf8747daaa8c58337 (patch) | |
| tree | e0531b6b297a4361cdca9da4d5f715ec44539c00 /arch/x86 | |
| parent | 296dc5806de57dc84fce000d60fc201ba40f96e8 (diff) | |
| download | linux-990e9dc381e6999a0eba8ebaf8747daaa8c58337.tar.xz | |
x86/ldt: Make all size computations unsigned
ldt->size can never be negative. The helper functions take 'unsigned int'
arguments which are assigned from ldt->size. The related user space
user_desc struct member entry_number is unsigned as well.
But ldt->size itself and a few local variables which are related to
ldt->size are type 'int' which makes no sense whatsoever and results in
typecasts which make the eyes bleed.
Clean it up and convert everything which is related to ldt->size to
unsigned it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/events/core.c | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/mmu_context.h | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/ldt.c | 10 |
3 files changed, 7 insertions, 7 deletions
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c index 6e395c996900..55e6c8a397c2 100644 --- a/arch/x86/events/core.c +++ b/arch/x86/events/core.c @@ -2299,7 +2299,7 @@ valid_user_frame(const void __user *fp, unsigned long size) static unsigned long get_segment_base(unsigned int segment) { struct desc_struct *desc; - int idx = segment >> 3; + unsigned int idx = segment >> 3; if ((segment & SEGMENT_TI_MASK) == SEGMENT_LDT) { #ifdef CONFIG_MODIFY_LDT_SYSCALL diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h index 8e0a9fe86de4..306c7e12af55 100644 --- a/arch/x86/include/asm/mmu_context.h +++ b/arch/x86/include/asm/mmu_context.h @@ -47,7 +47,7 @@ struct ldt_struct { * allocations, but it's not worth trying to optimize. */ struct desc_struct *entries; - int size; + unsigned int size; }; /* diff --git a/arch/x86/kernel/ldt.c b/arch/x86/kernel/ldt.c index e25b6681cc65..f09df2ff1bcc 100644 --- a/arch/x86/kernel/ldt.c +++ b/arch/x86/kernel/ldt.c @@ -37,7 +37,7 @@ static void flush_ldt(void *current_mm) static struct ldt_struct *alloc_ldt_struct(unsigned int size) { struct ldt_struct *new_ldt; - int alloc_size; + unsigned int alloc_size; if (size > LDT_ENTRIES) return NULL; @@ -207,11 +207,11 @@ static int read_default_ldt(void __user *ptr, unsigned long bytecount) static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode) { struct mm_struct *mm = current->mm; + struct ldt_struct *new_ldt, *old_ldt; + unsigned int oldsize, newsize; + struct user_desc ldt_info; struct desc_struct ldt; int error; - struct user_desc ldt_info; - int oldsize, newsize; - struct ldt_struct *new_ldt, *old_ldt; error = -EINVAL; if (bytecount != sizeof(ldt_info)) @@ -249,7 +249,7 @@ static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode) old_ldt = mm->context.ldt; oldsize = old_ldt ? old_ldt->size : 0; - newsize = max((int)(ldt_info.entry_number + 1), oldsize); + newsize = max(ldt_info.entry_number + 1, oldsize); error = -ENOMEM; new_ldt = alloc_ldt_struct(newsize); |