clearlinux/systemd-stable
2
0
Fork 0
mirror of https://github.com/clearlinux/systemd-stable.git synced 2026-09-01 11:16:00 +00:00
Code Issues Packages Projects Releases Wiki Activity

bus: map sealed memfds as MAP_PRIVATE

Browse Source 
Mapping files as MAP_SHARED is handled by the kernel as 'writable'
mapping. Always! Even with PROT_READ. Reason for that is,
mprotect(PROT_WRITE) could change the mapping underneath and currently
there is no kernel infrastructure to add protection there. This might
change in the future, but until then, map sealed files as MAP_PRIVATE so
we don't get EPERM.
This commit is contained in:
David Herrmann
2014-08-18 23:56:36 +02:00
parent 9da465df2a
commit 1ac36c67dd
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/libsystemd/sd-bus/bus-message.c
+1 -1
View File
@@ -2840,7 +2840,7 @@ int bus_body_part_map(struct bus_body_part *part) {
psz = PAGE_ALIGN(part->size);
if (part->memfd >= 0)
p = mmap(NULL, psz, PROT_READ, MAP_SHARED, part->memfd, 0);
p = mmap(NULL, psz, PROT_READ, MAP_PRIVATE, part->memfd, 0);
else if (part->is_zero)
p = mmap(NULL, psz, PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
else