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Avoid specifying VM_PROT_EXECUTE in mappings from pipe_map and exec_map.

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These submaps are used for mapping pipe buffers and execv() argument
strings respectively, so there's no need for such mappings to have
execute permissions.

Reported by:	jhb
Reviewed by:	alc, jhb, kib
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17827
This commit is contained in:
Mark Johnston 2018-11-06 21:57:03 +00:00
parent 2350a089e7
commit 07702f72e5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=340205
2 changed files with 4 additions and 5 deletions
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5
sys/kern/sys_pipe.c
View File

@ -509,9 +509,8 @@ pipespace_new(struct pipe *cpipe, int size)
size = round_page(size);
buffer = (caddr_t) vm_map_min(pipe_map);
error = vm_map_find(pipe_map, NULL, 0,
(vm_offset_t *) &buffer, size, 0, VMFS_ANY_SPACE,
VM_PROT_ALL, VM_PROT_ALL, 0);
error = vm_map_find(pipe_map, NULL, 0, (vm_offset_t *)&buffer, size, 0,
VMFS_ANY_SPACE, VM_PROT_RW, VM_PROT_RW, 0);
if (error != KERN_SUCCESS) {
if ((cpipe->pipe_buffer.buffer == NULL) &&
(size > SMALL_PIPE_SIZE)) {

4
sys/vm/vm_kern.c
View File

@ -650,8 +650,8 @@ kmap_alloc_wait(vm_map_t map, vm_size_t size)
map->needs_wakeup = TRUE;
vm_map_unlock_and_wait(map, 0);
}
vm_map_insert(map, NULL, 0, addr, addr + size, VM_PROT_ALL,
VM_PROT_ALL, MAP_ACC_CHARGED);
vm_map_insert(map, NULL, 0, addr, addr + size, VM_PROT_RW, VM_PROT_RW,
MAP_ACC_CHARGED);
vm_map_unlock(map);
return (addr);
}