31 lines
1.1 KiB
Diff
31 lines
1.1 KiB
Diff
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From ba5d26d85d0c4250b10a46a5c9cd3a3e1f0ce43b Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>
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Date: Fri, 4 Nov 2022 19:36:31 +0100
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Subject: [PATCH] loop-util: open lock fd read-only
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flock(2) works with file descriptors opened with O_RDONLY.
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This affects SELinux systems where access to block devices is quite
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restricted to avoid bypasses on filesystem objects.
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(cherry picked from commit 3e6b7d2626de9c0faf8b34b2629e8d6d8fa85a7d)
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Related #2138081
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---
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src/shared/loop-util.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/shared/loop-util.c b/src/shared/loop-util.c
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index 731ce29112..fb7e80b1b5 100644
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--- a/src/shared/loop-util.c
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+++ b/src/shared/loop-util.c
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@@ -77,7 +77,7 @@ static int open_lock_fd(int primary_fd, int operation) {
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assert(primary_fd >= 0);
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assert(IN_SET(operation & ~LOCK_NB, LOCK_SH, LOCK_EX));
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- lock_fd = fd_reopen(primary_fd, O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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+ lock_fd = fd_reopen(primary_fd, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (lock_fd < 0)
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return lock_fd;
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