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Fix several memory leaks

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Related: rhbz#2068423

Signed-off-by: Zoltan Fridrich <zfridric@redhat.com>
This commit is contained in:
Zoltan Fridrich 2022-07-11 10:35:00 +02:00
parent afede72d91
commit 585620b0f1
3 changed files with 162 additions and 25 deletions
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25
openssh-6.7p1-coverity.patch
View File

@ -101,22 +101,6 @@ diff -up openssh-7.4p1/channels.c.coverity openssh-7.4p1/channels.c
return idx;
}
diff -up openssh-8.5p1/compat.c.coverity openssh-8.5p1/compat.c
--- openssh-8.5p1/compat.c.coverity 2021-03-24 12:03:33.768968062 +0100
+++ openssh-8.5p1/compat.c 2021-03-24 12:03:33.783968166 +0100
@@ -191,10 +191,12 @@ compat_kex_proposal(struct ssh *ssh, cha
return p;
debug2_f("original KEX proposal: %s", p);
if ((ssh->compat & SSH_BUG_CURVE25519PAD) != 0)
+ /* coverity[overwrite_var : FALSE] */
if ((p = match_filter_denylist(p,
"curve25519-sha256@libssh.org")) == NULL)
fatal("match_filter_denylist failed");
if ((ssh->compat & SSH_OLD_DHGEX) != 0) {
+ /* coverity[overwrite_var : FALSE] */
if ((p = match_filter_denylist(p,
"diffie-hellman-group-exchange-sha256,"
"diffie-hellman-group-exchange-sha1")) == NULL)
diff -up openssh-8.5p1/dns.c.coverity openssh-8.5p1/dns.c
--- openssh-8.5p1/dns.c.coverity 2021-03-02 11:31:47.000000000 +0100
+++ openssh-8.5p1/dns.c 2021-03-24 12:03:33.783968166 +0100
@ -513,15 +497,6 @@ diff -up openssh-7.4p1/sshd.c.coverity openssh-7.4p1/sshd.c
}
/*
@@ -2474,7 +2479,7 @@ do_ssh2_kex(struct ssh *ssh)
if (options.rekey_limit || options.rekey_interval)
ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
options.rekey_interval);
-
+ /* coverity[leaked_storage : FALSE]*/
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
ssh, list_hostkey_types());
@@ -2519,8 +2524,11 @@ do_ssh2_kex(struct ssh *ssh)
if (newstr)

153
openssh-8.7p1-mem-leak.patch Normal file
View File

@ -0,0 +1,153 @@
diff --color -rup a/compat.c b/compat.c
--- a/compat.c 2021-08-20 06:03:49.000000000 +0200
+++ b/compat.c 2022-07-11 10:00:56.661195753 +0200
@@ -157,11 +157,12 @@ compat_banner(struct ssh *ssh, const cha
debug_f("no match: %s", version);
}
+/* Always returns pointer to allocated memory, caller must free. */
char *
compat_cipher_proposal(struct ssh *ssh, char *cipher_prop)
{
if (!(ssh->compat & SSH_BUG_BIGENDIANAES))
- return cipher_prop;
+ return xstrdup(cipher_prop);
debug2_f("original cipher proposal: %s", cipher_prop);
if ((cipher_prop = match_filter_denylist(cipher_prop, "aes*")) == NULL)
fatal("match_filter_denylist failed");
@@ -171,11 +172,12 @@ compat_cipher_proposal(struct ssh *ssh,
return cipher_prop;
}
+/* Always returns pointer to allocated memory, caller must free. */
char *
compat_pkalg_proposal(struct ssh *ssh, char *pkalg_prop)
{
if (!(ssh->compat & SSH_BUG_RSASIGMD5))
- return pkalg_prop;
+ return xstrdup(pkalg_prop);
debug2_f("original public key proposal: %s", pkalg_prop);
if ((pkalg_prop = match_filter_denylist(pkalg_prop, "ssh-rsa")) == NULL)
fatal("match_filter_denylist failed");
@@ -185,21 +187,26 @@ compat_pkalg_proposal(struct ssh *ssh, c
return pkalg_prop;
}
+/* Always returns pointer to allocated memory, caller must free. */
char *
compat_kex_proposal(struct ssh *ssh, char *p)
{
+ char *cp = NULL;
+
if ((ssh->compat & (SSH_BUG_CURVE25519PAD|SSH_OLD_DHGEX)) == 0)
- return p;
+ return xstrdup(p);
debug2_f("original KEX proposal: %s", p);
if ((ssh->compat & SSH_BUG_CURVE25519PAD) != 0)
if ((p = match_filter_denylist(p,
"curve25519-sha256@libssh.org")) == NULL)
fatal("match_filter_denylist failed");
if ((ssh->compat & SSH_OLD_DHGEX) != 0) {
+ cp = p;
if ((p = match_filter_denylist(p,
"diffie-hellman-group-exchange-sha256,"
"diffie-hellman-group-exchange-sha1")) == NULL)
fatal("match_filter_denylist failed");
+ free(cp);
}
debug2_f("compat KEX proposal: %s", p);
if (*p == '\0')
diff --color -rup a/sshconnect2.c b/sshconnect2.c
--- a/sshconnect2.c 2022-07-11 09:54:22.300523575 +0200
+++ b/sshconnect2.c 2022-07-11 10:13:20.516655403 +0200
@@ -218,6 +218,7 @@ ssh_kex2(struct ssh *ssh, char *host, st
{
char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
char *s, *all_key;
+ char *prop_kex = NULL, *prop_enc = NULL, *prop_hostkey = NULL;
int r, use_known_hosts_order = 0;
#if defined(GSSAPI) && defined(WITH_OPENSSL)
@@ -248,10 +249,9 @@ ssh_kex2(struct ssh *ssh, char *host, st
if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
fatal_f("kex_names_cat");
- myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(ssh, s);
+ myproposal[PROPOSAL_KEX_ALGS] = prop_kex = compat_kex_proposal(ssh, s);
myproposal[PROPOSAL_ENC_ALGS_CTOS] =
- compat_cipher_proposal(ssh, options.ciphers);
- myproposal[PROPOSAL_ENC_ALGS_STOC] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = prop_enc =
compat_cipher_proposal(ssh, options.ciphers);
myproposal[PROPOSAL_COMP_ALGS_CTOS] =
myproposal[PROPOSAL_COMP_ALGS_STOC] =
@@ -260,12 +260,12 @@ ssh_kex2(struct ssh *ssh, char *host, st
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
if (use_known_hosts_order) {
/* Query known_hosts and prefer algorithms that appear there */
- myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = prop_hostkey =
compat_pkalg_proposal(ssh,
order_hostkeyalgs(host, hostaddr, port, cinfo));
} else {
/* Use specified HostkeyAlgorithms exactly */
- myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = prop_hostkey =
compat_pkalg_proposal(ssh, options.hostkeyalgorithms);
}
@@ -379,6 +379,10 @@ ssh_kex2(struct ssh *ssh, char *host, st
(r = ssh_packet_write_wait(ssh)) != 0)
fatal_fr(r, "send packet");
#endif
+ /* Free only parts of proposal that were dynamically allocated here. */
+ free(prop_kex);
+ free(prop_enc);
+ free(prop_hostkey);
}
/*
diff --color -rup a/sshd.c b/sshd.c
--- a/sshd.c 2022-07-11 09:54:22.301523594 +0200
+++ b/sshd.c 2022-07-11 10:17:15.692209542 +0200
@@ -2479,14 +2479,14 @@ do_ssh2_kex(struct ssh *ssh)
{
char *myproposal[PROPOSAL_MAX] = { KEX_SERVER };
struct kex *kex;
+ char *prop_kex = NULL, *prop_enc = NULL, *prop_hostkey = NULL;
int r;
- myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(ssh,
+ myproposal[PROPOSAL_KEX_ALGS] = prop_kex = compat_kex_proposal(ssh,
options.kex_algorithms);
- myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(ssh,
- options.ciphers);
- myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(ssh,
- options.ciphers);
+ myproposal[PROPOSAL_ENC_ALGS_CTOS] =
+ myproposal[PROPOSAL_ENC_ALGS_STOC] = prop_enc =
+ compat_cipher_proposal(ssh, options.ciphers);
myproposal[PROPOSAL_MAC_ALGS_CTOS] =
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
@@ -2499,8 +2499,8 @@ do_ssh2_kex(struct ssh *ssh)
ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
options.rekey_interval);
- myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
- ssh, list_hostkey_types());
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = prop_hostkey =
+ compat_pkalg_proposal(ssh, list_hostkey_types());
#if defined(GSSAPI) && defined(WITH_OPENSSL)
{
@@ -2592,6 +2592,9 @@ do_ssh2_kex(struct ssh *ssh)
(r = ssh_packet_write_wait(ssh)) != 0)
fatal_fr(r, "send test");
#endif
+ free(prop_kex);
+ free(prop_enc);
+ free(prop_hostkey);
debug("KEX done");
}

9
openssh.spec
View File

@ -230,6 +230,12 @@ Patch1001: openssh-8.7p1-scp-clears-file.patch
# upstream bug:
# https://bugzilla.mindrot.org/show_bug.cgi?id=3455
Patch1002: openssh-8.7p1-ssh-manpage.patch
# Always return allocated strings from the kex filtering so that we can free them
# upstream commits:
# 486c4dc3b83b4b67d663fb0fa62bc24138ec3946
# 6c31ba10e97b6953c4f325f526f3e846dfea647a
# 322964f8f2e9c321e77ebae1e4d2cd0ccc5c5a0b
Patch1003: openssh-8.7p1-mem-leak.patch
License: BSD
Requires: /sbin/nologin
@ -421,6 +427,7 @@ popd
%patch1000 -p1 -b .minimize-sha1-use
%patch1001 -p1 -b .scp-clears-file
%patch1002 -p1 -b .ssh-manpage
%patch1003 -p1 -b .mem-leak
%patch100 -p1 -b .coverity
@ -706,6 +713,8 @@ test -f %{sysconfig_anaconda} && \
Resolves: rhbz#2056884
- Add missing options from ssh_config into ssh manpage
Resolves: rhbz#2033372
- Fix several memory leaks
Related: rhbz#2068423
* Wed Jun 29 2022 Dmitry Belyavskiy <dbelyavs@redhat.com> - 8.7p1-10
- Set minimal value of RSA key length via configuration option