lkml.org 
[lkml]   [2020]   [Apr]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subjecthv_hypercall_pg page permissios
Hi all,

The x86 Hyper-V hypercall page (hv_hypercall_pg) is the only allocation
in the kernel using __vmalloc with exectutable persmissions, and the
only user of PAGE_KERNEL_RX. Is there any good reason it needs to
be readable? Otherwise we could use vmalloc_exec and kill off
PAGE_KERNEL_RX. Note that before 372b1e91343e6 ("drivers: hv: Turn off
write permission on the hypercall page") it was even mapped writable..

\
 
 \ /
  Last update: 2020-04-07 08:55    [W:0.098 / U:0.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site