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x86/compat: Remove sys32_vm86_warning 

The check against lastcomm is racy, and the message it produces
isn't necessary.  vm86 support can be disabled on a 32-bit
kernel also, and doesn't have this message.  Switch to
sys_ni_syscall instead.

Signed-off-by: Brian Gerst <brgerst@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1425439896-8322-4-git-send-email-brgerst@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Brian Gerst 2015-03-03 22:31:34 -05:00 committed by Ingo Molnar
parent 2aa4a71092
commit 7e8e385aaf
2 changed files with 2 additions and 16 deletions
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14
arch/x86/ia32/sys_ia32.c
View File

@ -201,20 +201,6 @@ long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
advice);
}
long sys32_vm86_warning(void)
{
struct task_struct *me = current;
static char lastcomm[sizeof(me->comm)];
if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
compat_printk(KERN_INFO
"%s: vm86 mode not supported on 64 bit kernel\n",
me->comm);
strncpy(lastcomm, me->comm, sizeof(lastcomm));
}
return -ENOSYS;
}
asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
size_t count)
{

4
arch/x86/syscalls/syscall_32.tbl
View File

@ -119,7 +119,7 @@
110 i386 iopl sys_iopl
111 i386 vhangup sys_vhangup
112 i386 idle
113 i386 vm86old sys_vm86old sys32_vm86_warning
113 i386 vm86old sys_vm86old sys_ni_syscall
114 i386 wait4 sys_wait4 compat_sys_wait4
115 i386 swapoff sys_swapoff
116 i386 sysinfo sys_sysinfo compat_sys_sysinfo
@ -172,7 +172,7 @@
163 i386 mremap sys_mremap
164 i386 setresuid sys_setresuid16
165 i386 getresuid sys_getresuid16
166 i386 vm86 sys_vm86 sys32_vm86_warning
166 i386 vm86 sys_vm86 sys_ni_syscall
167 i386 query_module
168 i386 poll sys_poll
169 i386 nfsservctl