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From 3bdf6305f6a8501a692e1a98f98e0be9d3922a1d Mon Sep 17 00:00:00 2001
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From: Jakub Filak <jfilak@redhat.com>
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Date: Wed, 20 May 2015 08:08:58 +0200
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Subject: [ABRT PATCH] a-a-i-d-t-a-cache: don't open the build_ids file as abrt
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Opening the build_ids file as abrt may lead to information disclosure.
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Related: #1216962
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Signed-off-by: Jakub Filak <jfilak@redhat.com>
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---
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.../abrt-action-install-debuginfo-to-abrt-cache.c | 30 +++++++++++++++++-----
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1 file changed, 23 insertions(+), 7 deletions(-)
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diff --git a/src/plugins/abrt-action-install-debuginfo-to-abrt-cache.c b/src/plugins/abrt-action-install-debuginfo-to-abrt-cache.c
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index cd9ee7a..fafb0c4 100644
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--- a/src/plugins/abrt-action-install-debuginfo-to-abrt-cache.c
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+++ b/src/plugins/abrt-action-install-debuginfo-to-abrt-cache.c
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@@ -72,6 +72,11 @@ int main(int argc, char **argv)
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};
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const unsigned opts = parse_opts(argc, argv, program_options, program_usage_string);
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+ const gid_t egid = getegid();
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+ const gid_t rgid = getgid();
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+ const uid_t euid = geteuid();
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+ const gid_t ruid = getuid();
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+
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/* We need to open the build ids file under the caller's UID/GID to avoid
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* information disclosures when reading files with changed UID.
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* Unfortunately, we cannot replace STDIN with the new fd because ABRT uses
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@@ -82,7 +87,20 @@ int main(int argc, char **argv)
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char *build_ids_self_fd = NULL;
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if (strcmp("-", build_ids) != 0)
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{
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+ if (setregid(egid, rgid) < 0)
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+ perror_msg_and_die("setregid(egid, rgid)");
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+
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+ if (setreuid(euid, ruid) < 0)
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+ perror_msg_and_die("setreuid(euid, ruid)");
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+
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const int build_ids_fd = open(build_ids, O_RDONLY);
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+
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+ if (setregid(rgid, egid) < 0)
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+ perror_msg_and_die("setregid(rgid, egid)");
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+
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+ if (setreuid(ruid, euid) < 0 )
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+ perror_msg_and_die("setreuid(ruid, euid)");
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+
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if (build_ids_fd < 0)
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perror_msg_and_die("Failed to open file '%s'", build_ids);
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@@ -118,14 +136,12 @@ int main(int argc, char **argv)
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/* Switch real user/group to effective ones.
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* Otherwise yum library gets confused - gets EPERM (why??).
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*/
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- gid_t g = getegid();
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/* do setregid only if we have to, to not upset selinux needlessly */
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- if (g != getgid())
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- IGNORE_RESULT(setregid(g, g));
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- uid_t u = geteuid();
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- if (u != getuid())
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+ if (egid != rgid)
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+ IGNORE_RESULT(setregid(egid, egid));
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+ if (euid != ruid)
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{
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- IGNORE_RESULT(setreuid(u, u));
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+ IGNORE_RESULT(setreuid(euid, euid));
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/* We are suid'ed! */
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/* Prevent malicious user from messing up with suid'ed process: */
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#if 1
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@@ -179,7 +195,7 @@ int main(int argc, char **argv)
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// abrt-action-install-debuginfo doesn't fail when spawning
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// abrt-action-trim-files
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char path_env[] = "PATH=/usr/sbin:/sbin:/usr/bin:/bin:"BIN_DIR":"SBIN_DIR;
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- if (u != 0)
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+ if (euid != 0)
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strcpy(path_env, "PATH=/usr/bin:/bin:"BIN_DIR);
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putenv(path_env);
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--
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1.8.3.1
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