https://github.com/torvalds/linux
Revision ed52a9b556f31c07d1697acb16bd6fdb6ad9f504 authored by Dave Airlie on 28 May 2020, 05:38:42 UTC, committed by Dave Airlie on 28 May 2020, 05:38:43 UTC
Merge tag 'amd-drm-fixes-5.7-2020-05-27' of git://people.freedesktop.org/~agd5f/linux into drm-fixes
amd-drm-fixes-5.7-2020-05-27: amdgpu: - Display atomic test fix - Fix soft hang in display vupdate code Signed-off-by: Dave Airlie <airlied@redhat.com> From: Alex Deucher <alexdeucher@gmail.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200527222700.4378-1-alexander.deucher@amd.com
Tip revision: ed52a9b556f31c07d1697acb16bd6fdb6ad9f504 authored by Dave Airlie on 28 May 2020, 05:38:42 UTC
Merge tag 'amd-drm-fixes-5.7-2020-05-27' of git://people.freedesktop.org/~agd5f/linux into drm-fixes
Merge tag 'amd-drm-fixes-5.7-2020-05-27' of git://people.freedesktop.org/~agd5f/linux into drm-fixes
Tip revision: ed52a9b
min_addr.c
// SPDX-License-Identifier: GPL-2.0
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/security.h>
#include <linux/sysctl.h>
/* amount of vm to protect from userspace access by both DAC and the LSM*/
unsigned long mmap_min_addr;
/* amount of vm to protect from userspace using CAP_SYS_RAWIO (DAC) */
unsigned long dac_mmap_min_addr = CONFIG_DEFAULT_MMAP_MIN_ADDR;
/* amount of vm to protect from userspace using the LSM = CONFIG_LSM_MMAP_MIN_ADDR */
/*
* Update mmap_min_addr = max(dac_mmap_min_addr, CONFIG_LSM_MMAP_MIN_ADDR)
*/
static void update_mmap_min_addr(void)
{
#ifdef CONFIG_LSM_MMAP_MIN_ADDR
if (dac_mmap_min_addr > CONFIG_LSM_MMAP_MIN_ADDR)
mmap_min_addr = dac_mmap_min_addr;
else
mmap_min_addr = CONFIG_LSM_MMAP_MIN_ADDR;
#else
mmap_min_addr = dac_mmap_min_addr;
#endif
}
/*
* sysctl handler which just sets dac_mmap_min_addr = the new value and then
* calls update_mmap_min_addr() so non MAP_FIXED hints get rounded properly
*/
int mmap_min_addr_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int ret;
if (write && !capable(CAP_SYS_RAWIO))
return -EPERM;
ret = proc_doulongvec_minmax(table, write, buffer, lenp, ppos);
update_mmap_min_addr();
return ret;
}
static int __init init_mmap_min_addr(void)
{
update_mmap_min_addr();
return 0;
}
pure_initcall(init_mmap_min_addr);
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