41 lines
1.5 KiB
Diff
41 lines
1.5 KiB
Diff
From 0aadfe4937045efd5a7a53a176d05db7dc937435 Mon Sep 17 00:00:00 2001
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From: Robin Humble <plaguedbypenguins@gmail.com>
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Date: Wed, 1 Feb 2023 23:36:48 +1100
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Subject: [PATCH] pid1: fix segv triggered by status query (#26279)
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If any query makes it to the end of install_info_follow() then I think symlink_target is set to NULL.
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If that is followed by -EXDEV from unit_file_load_or_readlink(), then that causes basename(NULL)
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which segfaults pid 1.
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This is triggered by eg. "systemctl status crond" in RHEL9 if
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/etc/systemd/system/crond.service
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-> /ram/etc/systemd/system/crond.service
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-> /usr/lib/systemd/system/.crond.service.blah.blah
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-> /usr/lib/systemd/system/crond.service
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(cherry picked from commit 19cfda9fc3c60de21a362ebb56bcb9f4a9855e85)
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(cherry picked from commit 015b0ca9286471c05fe88cfa277dd82e20537ba8)
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(cherry picked from commit 9a906fae890904284fe91e29b6bdcb64429fecba)
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(cherry picked from commit a2dc9e3be9a8895edcba10f4c0d8d703b435c18b)
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---
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src/shared/install.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/src/shared/install.c b/src/shared/install.c
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index 4bf868f8e9..f038665dea 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -1609,7 +1609,7 @@ static int install_info_traverse(
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}
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r = install_info_follow(c, i, paths->root_dir, flags, false);
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- if (r == -EXDEV) {
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+ if (r == -EXDEV && i->symlink_target) {
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_cleanup_free_ char *buffer = NULL;
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const char *bn;
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--
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2.27.0
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