51 lines
1.8 KiB
Diff
51 lines
1.8 KiB
Diff
From linux-cifs Sat Nov 21 11:11:44 2020
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From: Jonas Witschel <diabonas () archlinux ! org>
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Date: Sat, 21 Nov 2020 11:11:44 +0000
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To: linux-cifs
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Subject: [PATCH 1/2] mount.cifs: update the cap bounding set only when CAP_SETPCAP is given
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Message-Id: <20201121111145.24975-2-diabonas () archlinux ! org>
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X-MARC-Message: https://marc.info/?l=linux-cifs&m=160595758021264
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libcap-ng 0.8.1 tightened the error checking on capng_apply, returning an error
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of -4 when trying to update the capability bounding set without having the
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CAP_SETPCAP capability to be able to do so. Previous versions of libcap-ng
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silently skipped updating the bounding set and only updated the normal
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CAPNG_SELECT_CAPS capabilities instead.
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Check beforehand whether we have CAP_SETPCAP, in which case we can use
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CAPNG_SELECT_BOTH to update both the normal capabilities and the bounding set.
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Otherwise, we can at least update the normal capabilities, but refrain from
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trying to update the bounding set to avoid getting an error.
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Signed-off-by: Jonas Witschel <diabonas@archlinux.org>
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---
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mount.cifs.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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diff --git a/mount.cifs.c b/mount.cifs.c
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index 4feb397..88b8b69 100644
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--- mount.cifs.c
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+++ mount.cifs.c
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@@ -338,6 +338,8 @@ static int set_password(struct parsed_mount_info *parsed_info, const char *src)
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static int
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drop_capabilities(int parent)
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{
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+ capng_select_t set = CAPNG_SELECT_CAPS;
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+
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capng_setpid(getpid());
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capng_clear(CAPNG_SELECT_BOTH);
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if (parent) {
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@@ -355,7 +357,10 @@ drop_capabilities(int parent)
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return EX_SYSERR;
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}
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}
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- if (capng_apply(CAPNG_SELECT_BOTH)) {
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+ if (capng_have_capability(CAPNG_EFFECTIVE, CAP_SETPCAP)) {
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+ set = CAPNG_SELECT_BOTH;
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+ }
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+ if (capng_apply(set)) {
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fprintf(stderr, "Unable to apply new capability set.\n");
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return EX_SYSERR;
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}
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--
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2.29.2
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