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Merge pull request #871 from amshinde/allow-read-only-image

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qemu: Patch qemu to support image without write access.
This commit is contained in:
Archana Shinde
2019-12-11 10:43:29 -08:00
committed by GitHub
parent e76cf80b50 076cfa9b6a
commit 55e81c2d39
1 changed files with 7 additions and 5 deletions
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12
qemu/patches/4.1.x/0002-memory-backend-file-nvdimm-support-read-only-files-a.patch
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@@ -4,11 +4,12 @@ Date: Mon, 8 Jul 2019 21:19:36 +0000
Subject: [PATCH 2/3] memory-backend-file/nvdimm: support read-only files as
memory-backends
Currently is not possible to use a file that is part of a read-only
filesystem as memory backend for nvdimm devices, even if this is not modified
in the guest. In order to improve the security of Virtual Machines that share
Currently it is not possible to use a file that is part of a read-only
filesystem as memory backend for nvdimm devices, even if the file itself
is not modified in the guest. Same goes for files that do not have write access.
In order to improve the security of Virtual Machines that share
and do not modify the memory-backend-file, QEMU should support
read-only memory-backeds.
read-only memory-backends.
Use case:
* Kata Containers use a memory-backed-file as read-only rootfs, and this
@@ -16,6 +17,7 @@ Use case:
It would be really bad if somehow a malicious container modified it.
Signed-off-by: Julio Montes <julio.montes@intel.com>
Signed-off-by: Archana Shinde <archana.m.shinde@intel.com>
Message-Id: <20190708211936.8037-1-julio.montes@intel.com>
---
exec.c | 6 ++++++
@@ -29,7 +31,7 @@ index 3e78de3b8f..a1b6f939fb 100644
break;
}
g_free(filename);
+ } else if (errno == EROFS) {
+ } else if (errno == EROFS || errno == EACCES) {
+ fd = open(path, O_RDONLY);
+ if (fd >= 0) {
+ /* @path names an existing read-only file, use it */