diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2019-11-12 21:40:33 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-11-16 11:24:06 +0100 |
| commit | 111e7b15cf10f6e973ccf537c70c66a5de539060 (patch) | |
| tree | 93f6a063e7829376797a00750c338338be0eee7d /arch/x86/include/asm/processor.h | |
| parent | a24ca9976843156eabbc5f2d798954b5674d1b61 (diff) | |
x86/ioperm: Extend IOPL config to control ioperm() as well
If iopl() is disabled, then providing ioperm() does not make much sense.
Rename the config option and disable/enable both syscalls with it. Guard
the code with #ifdefs where appropriate.
Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/include/asm/processor.h')
| -rw-r--r-- | arch/x86/include/asm/processor.h | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 1387d31c5e07..45f416a2c1f1 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -340,13 +340,18 @@ struct x86_hw_tss { (offsetof(struct tss_struct, io_bitmap.mapall) - \ offsetof(struct tss_struct, x86_tss)) +#ifdef CONFIG_X86_IOPL_IOPERM /* * sizeof(unsigned long) coming from an extra "long" at the end of the * iobitmap. The limit is inclusive, i.e. the last valid byte. */ -#define __KERNEL_TSS_LIMIT \ +# define __KERNEL_TSS_LIMIT \ (IO_BITMAP_OFFSET_VALID_ALL + IO_BITMAP_BYTES + \ sizeof(unsigned long) - 1) +#else +# define __KERNEL_TSS_LIMIT \ + (offsetof(struct tss_struct, x86_tss) + sizeof(struct x86_hw_tss) - 1) +#endif /* Base offset outside of TSS_LIMIT so unpriviledged IO causes #GP */ #define IO_BITMAP_OFFSET_INVALID (__KERNEL_TSS_LIMIT + 1) @@ -398,7 +403,9 @@ struct tss_struct { */ struct x86_hw_tss x86_tss; +#ifdef CONFIG_X86_IOPL_IOPERM struct x86_io_bitmap io_bitmap; +#endif } __aligned(PAGE_SIZE); DECLARE_PER_CPU_PAGE_ALIGNED(struct tss_struct, cpu_tss_rw); |