#include #include #include #include /* 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); net-next plumbingsTobias Klauser
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authorEmese Revfy <re.emese@gmail.com>2016-06-20 20:42:34 +0200
committerKees Cook <keescook@chromium.org>2016-10-10 14:51:45 -0700
commit0766f788eb727e2e330d55d30545db65bcf2623f (patch)
tree0436ae3b005558a4fb827459fe5c602037fe764a /include/xen/interface
parent38addce8b600ca335dc86fa3d48c890f1c6fa1f4 (diff)
latent_entropy: Mark functions with __latent_entropy
The __latent_entropy gcc attribute can be used only on functions and variables. If it is on a function then the plugin will instrument it for gathering control-flow entropy. If the attribute is on a variable then the plugin will initialize it with random contents. The variable must be an integer, an integer array type or a structure with integer fields. These specific functions have been selected because they are init functions (to help gather boot-time entropy), are called at unpredictable times, or they have variable loops, each of which provide some level of latent entropy. Signed-off-by: Emese Revfy <re.emese@gmail.com> [kees: expanded commit message] Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'include/xen/interface')