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From 93ecea3488081a726bcd2ddb04d557decaa87f80 Mon Sep 17 00:00:00 2001
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From: Simon McVittie <smcv@collabora.com>
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Date: Mon, 18 Jan 2021 17:52:13 +0000
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Subject: [PATCH] build: Convert environment into a sequence of bwrap arguments
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This means we can systematically pass the environment variables
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through bwrap(1), even if it is setuid and thus is filtering out
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security-sensitive environment variables. bwrap itself ends up being
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run with an empty environment instead.
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This fixes a regression when CVE-2021-21261 was fixed: before the
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CVE fixes, LD_LIBRARY_PATH would have been passed through like this
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and appeared in the `flatpak build` shell, but during the CVE fixes,
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the special case that protected LD_LIBRARY_PATH was removed in favour
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of the more general flatpak_bwrap_envp_to_args(). That reasoning only
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works if we use flatpak_bwrap_envp_to_args(), consistently, everywhere
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that we run the potentially-setuid bwrap.
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Fixes: 6d1773d2 "run: Convert all environment variables into bwrap arguments"
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Resolves: https://github.com/flatpak/flatpak/issues/4080
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Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=980323
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Signed-off-by: Simon McVittie <smcv@collabora.com>
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(cherry picked from commit 9a61d2c44f0a58cebcb9b2787ae88db07ca68bb0)
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---
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app/flatpak-builtins-build.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/app/flatpak-builtins-build.c b/app/flatpak-builtins-build.c
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index 8da0de814..07ef6fc07 100644
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--- a/app/flatpak-builtins-build.c
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+++ b/app/flatpak-builtins-build.c
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@@ -569,6 +569,8 @@ flatpak_builtin_build (int argc, char **argv, GCancellable *cancellable, GError
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NULL);
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}
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+ flatpak_bwrap_envp_to_args (bwrap);
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+
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if (!flatpak_bwrap_bundle_args (bwrap, 1, -1, FALSE, error))
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return FALSE;
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From f91857c07ede7ef5150a38d6b8e49ee43d6b3d50 Mon Sep 17 00:00:00 2001
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From: Simon McVittie <smcv@collabora.com>
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Date: Mon, 18 Jan 2021 18:07:38 +0000
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Subject: [PATCH] dir: Pass environment via bwrap --setenv when running
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apply_extra
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This means we can systematically pass the environment variables
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through bwrap(1), even if it is setuid and thus is filtering out
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security-sensitive environment variables. bwrap ends up being
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run with an empty environment instead.
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As with the previous commit, this regressed while fixing CVE-2021-21261.
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Fixes: 6d1773d2 "run: Convert all environment variables into bwrap arguments"
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Signed-off-by: Simon McVittie <smcv@collabora.com>
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(cherry picked from commit fb473cad801c6b61706353256cab32330557374a)
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---
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common/flatpak-dir.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/common/flatpak-dir.c b/common/flatpak-dir.c
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index ed1248e74..40767fa77 100644
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--- a/common/flatpak-dir.c
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+++ b/common/flatpak-dir.c
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@@ -7426,6 +7426,8 @@ apply_extra_data (FlatpakDir *self,
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app_context, NULL, NULL, NULL, cancellable, error))
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return FALSE;
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+ flatpak_bwrap_envp_to_args (bwrap);
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+
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flatpak_bwrap_add_arg (bwrap, "/app/bin/apply_extra");
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flatpak_bwrap_finish (bwrap);
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