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selinux: make default_noexec read-only after init 

SELinux checks whether VM_EXEC is set in the VM_DATA_DEFAULT_FLAGS
during initialization and saves the result in default_noexec for use
in its mmap and mprotect hook function implementations to decide
whether to apply EXECMEM, EXECHEAP, EXECSTACK, and EXECMOD checks.
Mark default_noexec as ro_after_init to prevent later clearing it
and thereby disabling these checks.  It is only set legitimately from
init code.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Stephen Smalley 2020-01-08 12:23:56 -05:00 committed by Paul Moore
parent fe49c7e4f8
commit b78b7d59bd
1 changed files with 1 additions and 1 deletions
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2
security/selinux/hooks.c
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@ -3647,7 +3647,7 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
return error;
}
static int default_noexec;
static int default_noexec __ro_after_init;
static int file_map_prot_check(struct file *file, unsigned long prot, int shared)
{