Compare commits
No commits in common. "c8" and "c9-beta" have entirely different histories.
@ -1 +1 @@
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f62f7900c32a5fec4e53a929eae5a9fd16bb3536 SOURCES/bubblewrap-0.4.0.tar.xz
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00e121950ea494fcd9cfbe23971c0938d6be6755 SOURCES/bubblewrap-0.4.1.tar.xz
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2
.gitignore
vendored
2
.gitignore
vendored
@ -1 +1 @@
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SOURCES/bubblewrap-0.4.0.tar.xz
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SOURCES/bubblewrap-0.4.1.tar.xz
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@ -1,128 +0,0 @@
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From 52d5f7c3ba5c8e10b3a992304fd28cd4d18caeeb Mon Sep 17 00:00:00 2001
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From: Alexander Larsson <alexl@redhat.com>
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Date: Tue, 18 Jun 2024 10:20:36 +0200
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Subject: [PATCH] Add --bind-fd and --ro-bind-fd to let you bind a O_PATH fd.
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This is useful for example if you for some reason don't have the real
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path. It is also a way to make bind-mounts race-free (i.e. to have the
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mount actually be the thing you wanted to be mounted, avoiding issues
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where some other process replaces the target in parallel with the bwrap
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launch.
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Unfortunately due to some technical details we can't actually directly
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mount the dirfd, as they come from different user namespace which is not
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permitted, but at least we can delay resolving the fd to a path as much as
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possible, and then validate after mount that we actually mounted the right
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thing.
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Signed-off-by: Alexander Larsson <alexl@redhat.com>
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(cherry picked from commit a253257cd298892da43e15201d83f9a02c9b58b5)
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[kalev: Backport to 0.4.x]
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Signed-off-by: Kalev Lember <klember@redhat.com>
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---
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bubblewrap.c | 50 +++++++++++++++++++++++++++++++++++++++++++++++
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tests/test-run.sh | 7 ++++++-
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2 files changed, 56 insertions(+), 1 deletion(-)
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diff --git a/bubblewrap.c b/bubblewrap.c
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index b3d52bc..38b3646 100644
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--- a/bubblewrap.c
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+++ b/bubblewrap.c
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@@ -250,6 +250,8 @@ usage (int ecode, FILE *out)
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" --dev-bind-try SRC DEST Equal to --dev-bind but ignores non-existent SRC\n"
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" --ro-bind SRC DEST Bind mount the host path SRC readonly on DEST\n"
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" --ro-bind-try SRC DEST Equal to --ro-bind but ignores non-existent SRC\n"
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+ " --bind-fd FD DEST Bind open directory or path fd on DEST\n"
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+ " --ro-bind-fd FD DEST Bind open directory or path fd read-only on DEST\n"
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" --remount-ro DEST Remount DEST as readonly; does not recursively remount\n"
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" --exec-label LABEL Exec label for the sandbox\n"
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" --file-label LABEL File label for temporary sandbox content\n"
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@@ -1111,6 +1113,30 @@ setup_newroot (bool unshare_pid,
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(op->type == SETUP_RO_BIND_MOUNT ? BIND_READONLY : 0) |
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(op->type == SETUP_DEV_BIND_MOUNT ? BIND_DEVICES : 0),
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source, dest);
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+
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+ if (op->fd >= 0)
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+ {
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+ struct stat fd_st, mount_st;
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+
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+ /* When using bind-fd, there is a race condition between resolving the fd as a magic symlink
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+ * and mounting it, where someone could replace what is at the symlink target. Ideally
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+ * we would not even resolve the symlink and directly bind-mount from the fd, but unfortunately
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+ * we can't do that, because its not permitted to bind mount a fd from another user namespace.
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+ * So, we resolve, mount and then compare fstat+stat to detect the race. */
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+
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+ if (fstat(op->fd, &fd_st) != 0)
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+ die_with_error("Can't stat fd %d", op->fd);
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+ if (lstat(dest, &mount_st) != 0)
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+ die_with_error("Can't stat mount at %s", dest);
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+
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+ if (fd_st.st_ino != mount_st.st_ino ||
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+ fd_st.st_dev != mount_st.st_dev)
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+ die_with_error("Race condition binding dirfd");
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+
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+ close(op->fd);
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+ op->fd = -1;
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+ }
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+
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break;
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case SETUP_REMOUNT_RO_NO_RECURSIVE:
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@@ -1648,6 +1674,30 @@ parse_args_recurse (int *argcp,
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if (strcmp(arg, "--dev-bind-try") == 0)
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op->flags = ALLOW_NOTEXIST;
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+ argv += 2;
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+ argc -= 2;
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+ }
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+ else if (strcmp (arg, "--bind-fd") == 0 ||
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+ strcmp (arg, "--ro-bind-fd") == 0)
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+ {
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+ int src_fd;
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+ char *endptr;
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+
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+ if (argc < 3)
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+ die ("--bind-fd takes two arguments");
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+
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+ src_fd = strtol (argv[1], &endptr, 10);
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+ if (argv[1][0] == 0 || endptr[0] != 0 || src_fd < 0)
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+ die ("Invalid fd: %s", argv[1]);
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+
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+ if (strcmp(arg, "--ro-bind-fd") == 0)
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+ op = setup_op_new (SETUP_RO_BIND_MOUNT);
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+ else
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+ op = setup_op_new (SETUP_BIND_MOUNT);
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+ op->source = xasprintf ("/proc/self/fd/%d", src_fd);
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+ op->fd = src_fd;
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+ op->dest = argv[2];
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+
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argv += 2;
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argc -= 2;
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}
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diff --git a/tests/test-run.sh b/tests/test-run.sh
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index 702c480..ce1eaf6 100755
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--- a/tests/test-run.sh
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+++ b/tests/test-run.sh
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@@ -80,7 +80,7 @@ if ! $RUN true; then
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skip Seems like bwrap is not working at all. Maybe setuid is not working
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fi
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-echo "1..49"
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+echo "1..50"
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# Test help
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${BWRAP} --help > help.txt
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@@ -382,5 +382,10 @@ else
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echo "ok - Test --pidns"
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fi
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+echo "foobar" > file-data
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+$RUN --proc /proc --dev /dev --bind / / --bind-fd 100 /tmp cat /tmp/file-data 100< . > stdout
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+assert_file_has_content stdout foobar
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+
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+echo "ok - bind-fd"
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echo "ok - End of test"
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--
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2.46.0
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|
@ -0,0 +1,39 @@
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From d70c640aecc30e9216dc1a614a207e85c8732036 Mon Sep 17 00:00:00 2001
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From: Colin Walters <walters@verbum.org>
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Date: Thu, 27 May 2021 16:19:27 -0400
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Subject: [PATCH] Avoid memory leak if --args is specified multiple times
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Found by a static analyzer.
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```
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bubblewrap-0.4.1/bubblewrap.c:1500: overwrite_var: Overwriting "opt_args_data" in "opt_args_data = load_file_data(the_fd, &data_len)" leaks the storage that "opt_args_data" points to.
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# 1498| * keep allocated until exit time, since its argv entries get used
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# 1499| * by the other cases in parse_args_recurse() when we recurse. */
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# 1500|-> opt_args_data = load_file_data (the_fd, &data_len);
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# 1501| if (opt_args_data == NULL)
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# 1502| die_with_error ("Can't read --args data");
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```
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---
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bubblewrap.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/bubblewrap.c b/bubblewrap.c
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index 771e1ea..56ac07c 100644
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--- a/bubblewrap.c
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+++ b/bubblewrap.c
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@@ -1494,6 +1494,12 @@ parse_args_recurse (int *argcp,
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if (argv[1][0] == 0 || endptr[0] != 0 || the_fd < 0)
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die ("Invalid fd: %s", argv[1]);
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+ /* Specifying --args multiple times doesn't work; this just pacifies
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+ * a static analyzer which pointed out the memory leak
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+ */
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+ if (opt_args_data != NULL)
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+ free (opt_args_data);
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+
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/* opt_args_data is essentially a recursive argv array, which we must
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* keep allocated until exit time, since its argv entries get used
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* by the other cases in parse_args_recurse() when we recurse. */
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--
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2.31.1
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|
@ -1,13 +1,13 @@
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Name: bubblewrap
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Version: 0.4.0
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Release: 2%{?dist}
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Version: 0.4.1
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Release: 6%{?dist}
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Summary: Core execution tool for unprivileged containers
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License: LGPLv2+
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#VCS: git:https://github.com/projectatomic/bubblewrap
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URL: https://github.com/projectatomic/bubblewrap
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Source0: https://github.com/projectatomic/bubblewrap/releases/download/v%{version}/bubblewrap-%{version}.tar.xz
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Patch0: 0001-Add-bind-fd-and-ro-bind-fd-to-let-you-bind-a-O_PATH-.patch
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Patch0: 0001-Avoid-memory-leak-if-args-is-specified-multiple-time.patch
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BuildRequires: autoconf automake libtool
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BuildRequires: gcc
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@ -15,6 +15,7 @@ BuildRequires: libcap-devel
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BuildRequires: pkgconfig(libselinux)
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BuildRequires: libxslt
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BuildRequires: docbook-style-xsl
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BuildRequires: make
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%description
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Bubblewrap (/usr/bin/bwrap) is a core execution engine for unprivileged
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@ -22,7 +23,7 @@ containers that works as a setuid binary on kernels without
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user namespaces.
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%prep
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%autosetup -p1
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%autosetup
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%build
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if ! test -x configure; then NOCONFIGURE=1 ./autogen.sh; fi
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@ -46,11 +47,45 @@ find %{buildroot} -name '*.la' -delete -print
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%{_mandir}/man1/*
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%changelog
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* Fri Aug 30 2024 Kalev Lember <klember@redhat.com> - 0.4.0-2
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- Backport upstream fix to help address CVE-2024-42472 in flatpak
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* Mon Aug 09 2021 Mohan Boddu <mboddu@redhat.com> - 0.4.1-6
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- Rebuilt for IMA sigs, glibc 2.34, aarch64 flags
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Related: rhbz#1991688
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* Thu Jan 09 2020 David King <dking@redhat.com> - 0.4.0-1
|
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- Rebase to 0.4.0 (#1788067)
|
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* Thu May 27 2021 Colin Walters <walters@verbum.org> - 0.4.1-5
|
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- Backport https://github.com/containers/bubblewrap/pull/426
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* Thu Apr 15 2021 Mohan Boddu <mboddu@redhat.com> - 0.4.1-4
|
||||
- Rebuilt for RHEL 9 BETA on Apr 15th 2021. Related: rhbz#1947937
|
||||
|
||||
* Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 0.4.1-3
|
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- Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild
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* Mon Jul 27 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.4.1-2
|
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- Rebuilt for https://fedoraproject.org/wiki/Fedora_33_Mass_Rebuild
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* Mon Mar 30 2020 David King <amigadave@amigadave.com> - 0.4.1-1
|
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- Update to 0.4.1
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||||
|
||||
* Tue Jan 28 2020 Fedora Release Engineering <releng@fedoraproject.org> - 0.4.0-2
|
||||
- Rebuilt for https://fedoraproject.org/wiki/Fedora_32_Mass_Rebuild
|
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|
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* Wed Nov 27 2019 Kalev Lember <klember@redhat.com> - 0.4.0-1
|
||||
- Update to 0.4.0
|
||||
|
||||
* Wed Jul 24 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.3.3-3
|
||||
- Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
|
||||
|
||||
* Wed May 01 2019 Colin Walters <walters@redhat.com> - 0.3.3-2
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||||
- New upstream release
|
||||
|
||||
* Thu Jan 31 2019 Fedora Release Engineering <releng@fedoraproject.org> - 0.3.1-2
|
||||
- Rebuilt for https://fedoraproject.org/wiki/Fedora_30_Mass_Rebuild
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|
||||
* Mon Oct 01 2018 Kalev Lember <klember@redhat.com> - 0.3.1-1
|
||||
- Update to 0.3.1
|
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|
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* Thu Jul 12 2018 Fedora Release Engineering <releng@fedoraproject.org> - 0.3.0-2
|
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- Rebuilt for https://fedoraproject.org/wiki/Fedora_29_Mass_Rebuild
|
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|
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* Wed Jul 11 2018 Colin Walters <walters@verbum.org> - 0.3.0-1
|
||||
- https://github.com/projectatomic/bubblewrap/releases/tag/v0.3.0
|
||||
|
Loading…
Reference in New Issue
Block a user