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fix programming mistakes detected by static analysis

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This commit is contained in:
Kamil Dudka 2018-11-12 14:54:50 +01:00
parent 9bba558cc8
commit d431dce30f
2 changed files with 273 additions and 1 deletions
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266
0002-zsh-5.5.1-static-analysis.patch Normal file
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@ -0,0 +1,266 @@
From bc943b78268ad633f79756639d4295f7b61dbedd Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 7 Nov 2018 14:04:52 +0100
Subject: [PATCH 1/5] 43791: File descriptor could be closed twice in clone
Upstream-commit: a8cc017c74a916b690dc074c299faf4bd24b5af4
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
Error: USE_AFTER_FREE (CWE-825):
zsh-5.5.1/Src/Modules/clone.c:71: closed_arg: "close(int)" closes "ttyfd".
zsh-5.5.1/Src/Modules/clone.c:99: double_close: Calling "close(int)" closes handle "ttyfd" which has already been closed.
97| setsparam("TTY", ztrdup(ttystrname));
98| }
99|-> close(ttyfd);
100| if (pid < 0) {
101| zerrnam(nam, "fork failed: %e", errno);
---
Src/Modules/clone.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Src/Modules/clone.c b/Src/Modules/clone.c
index 9304292..dfd8e8a 100644
--- a/Src/Modules/clone.c
+++ b/Src/Modules/clone.c
@@ -96,7 +96,8 @@ bin_clone(char *nam, char **args, UNUSED(Options ops), UNUSED(int func))
init_io(NULL);
setsparam("TTY", ztrdup(ttystrname));
}
- close(ttyfd);
+ else
+ close(ttyfd);
if (pid < 0) {
zerrnam(nam, "fork failed: %e", errno);
return 1;
--
2.17.2
From 6096988f02635ed336a056e3670b63070400e6bc Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 7 Nov 2018 14:04:53 +0100
Subject: [PATCH 2/5] 43793: computil could overrun buffer
Upstream-commit: 031afe420725e328e9d7742be69ef0bd81c62b9a
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
Error: BUFFER_SIZE (CWE-120):
zsh-5.5.1/Src/Zle/computil.c:564: overlapping_buffer: The source buffer "str->str + 2" potentially overlaps with the destination buffer "str->str", which results in undefined behavior for "strcpy".
zsh-5.5.1/Src/Zle/computil.c:564: remediation: Replace "strcpy(dest, src)" with "memmove(dest, src, strlen(src)+1)".
562| str->str = ztrdup(str->str);
563| if (hide[1] && str->str[0] == '-' && str->str[1] == '-')
564|-> strcpy(str->str, str->str + 2);
565| else if (str->str[0] == '-' || str->str[0] == '+')
566| strcpy(str->str, str->str + 1);
Error: BUFFER_SIZE (CWE-120):
zsh-5.5.1/Src/Zle/computil.c:566: overlapping_buffer: The source buffer "str->str + 1" potentially overlaps with the destination buffer "str->str", which results in undefined behavior for "strcpy".
zsh-5.5.1/Src/Zle/computil.c:566: remediation: Replace "strcpy(dest, src)" with "memmove(dest, src, strlen(src)+1)".
564| strcpy(str->str, str->str + 2);
565| else if (str->str[0] == '-' || str->str[0] == '+')
566|-> strcpy(str->str, str->str + 1);
567| }
568| }
---
Src/Zle/computil.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/Src/Zle/computil.c b/Src/Zle/computil.c
index 5526e0a..cb1c010 100644
--- a/Src/Zle/computil.c
+++ b/Src/Zle/computil.c
@@ -561,9 +561,9 @@ cd_init(char *nam, char *hide, char *mlen, char *sep,
if (str->str == str->match)
str->str = ztrdup(str->str);
if (hide[1] && str->str[0] == '-' && str->str[1] == '-')
- strcpy(str->str, str->str + 2);
+ memmove(str->str, str->str + 2, strlen(str->str) - 1);
else if (str->str[0] == '-' || str->str[0] == '+')
- strcpy(str->str, str->str + 1);
+ memmove(str->str, str->str + 1, strlen(str->str));
}
}
for (ap = args; *args &&
--
2.17.2
From 29445bdf10714bd41d2124d3c31cc16c1f682854 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 7 Nov 2018 14:04:54 +0100
Subject: [PATCH 3/5] 43723: file descriptor could leak on fork error
Upstream-commit: d1095bdf744c190c7e8ff126ba02caea8f63880d
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
Error: RESOURCE_LEAK (CWE-772):
zsh-5.5.1/Src/exec.c:4680: open_fn: Returning handle opened by "open".
zsh-5.5.1/Src/exec.c:4680: var_assign: Assigning: "fd" = handle returned from "open(nam, 449, 384)".
zsh-5.5.1/Src/exec.c:4810: leaked_handle: Handle variable "fd" going out of scope leaks the handle.
4808| /* fork or open error */
4809| child_unblock();
4810|-> return nam;
4811| } else if (pid) {
4812| int os;
---
Src/exec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Src/exec.c b/Src/exec.c
index 0908a1a..8045db2 100644
--- a/Src/exec.c
+++ b/Src/exec.c
@@ -4722,7 +4722,8 @@ getoutputfile(char *cmd, char **eptr)
}
if ((cmdoutpid = pid = zfork(NULL)) == -1) {
- /* fork or open error */
+ /* fork error */
+ close(fd);
child_unblock();
return nam;
} else if (pid) {
--
2.17.2
From afb4192a75066f86ce7051a72c0feb7b80c0cdd8 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 7 Nov 2018 14:04:55 +0100
Subject: [PATCH 4/5] 43789: possible use after free clearing up math func from
module
Upstream-commit: e27175c7c8cdfeb4e28d4ff21eb51aa003d70a03
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
Error: USE_AFTER_FREE (CWE-825):
zsh-5.5.1/Src/module.c:1390: freed_arg: "deletemathfunc" frees "f".
zsh-5.5.1/Src/module.c:1352:6: freed_arg: "zfree" frees parameter "f".
zsh-5.5.1/Src/mem.c:1888:5: freed_arg: "free" frees parameter "p".
zsh-5.5.1/Src/module.c:1394: deref_after_free: Dereferencing freed pointer "f".
1392| ret = 1;
1393| } else {
1394|-> f->flags &= ~MFF_ADDED;
1395| }
1396| }
---
Src/module.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/Src/module.c b/Src/module.c
index 4ae7831..33d75eb 100644
--- a/Src/module.c
+++ b/Src/module.c
@@ -1390,8 +1390,6 @@ setmathfuncs(char const *nam, MathFunc f, int size, int *e)
if (deletemathfunc(f)) {
zwarnnam(nam, "math function `%s' already deleted", f->name);
ret = 1;
- } else {
- f->flags &= ~MFF_ADDED;
}
}
f++;
--
2.17.2
From 4553645c00d9a2e81a79e2014b106f6590500287 Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 7 Nov 2018 14:04:56 +0100
Subject: [PATCH 5/5] 43790: failed mailstat could leak memory
Upstream-commit: d50e204b0c4c10164a711bf640500e46987de9c3
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
Error: RESOURCE_LEAK (CWE-772):
zsh-5.5.1/Src/utils.c:7406: alloc_fn: Storage is returned from allocation function "appstr".
zsh-5.5.1/Src/string.c:200:5: alloc_fn: Storage is returned from allocation function "realloc".
zsh-5.5.1/Src/string.c:200:5: identity_transfer: Passing "realloc(base, strlen(base) + strlen(append) + 1UL)" as argument 1 to function "strcat", which returns that argument.
zsh-5.5.1/Src/string.c:200:5: return_alloc_fn: Directly returning storage allocated by "strcat".
zsh-5.5.1/Src/utils.c:7406: var_assign: Assigning: "dir" = storage returned from "appstr(ztrdup(path), "/cur")".
zsh-5.5.1/Src/utils.c:7407: noescape: Resource "dir" is not freed or pointed-to in "stat".
zsh-5.5.1/Src/utils.c:7407: leaked_storage: Variable "dir" going out of scope leaks the storage it points to.
7405| /* See if cur/ is present */
7406| dir = appstr(ztrdup(path), "/cur");
7407|-> if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) return 0;
7408| st_ret.st_atime = st_tmp.st_atime;
7409|
Error: RESOURCE_LEAK (CWE-772):
zsh-5.5.1/Src/utils.c:7412: alloc_fn: Storage is returned from allocation function "appstr".
zsh-5.5.1/Src/string.c:200:5: alloc_fn: Storage is returned from allocation function "realloc".
zsh-5.5.1/Src/string.c:200:5: identity_transfer: Passing "realloc(base, strlen(base) + strlen(append) + 1UL)" as argument 1 to function "strcat", which returns that argument.
zsh-5.5.1/Src/string.c:200:5: return_alloc_fn: Directly returning storage allocated by "strcat".
zsh-5.5.1/Src/utils.c:7412: var_assign: Assigning: "dir" = storage returned from "appstr(dir, "/tmp")".
zsh-5.5.1/Src/utils.c:7413: noescape: Resource "dir" is not freed or pointed-to in "stat".
zsh-5.5.1/Src/utils.c:7413: leaked_storage: Variable "dir" going out of scope leaks the storage it points to.
7411| dir[plen] = 0;
7412| dir = appstr(dir, "/tmp");
7413|-> if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) return 0;
7414| st_ret.st_mtime = st_tmp.st_mtime;
7415|
Error: RESOURCE_LEAK (CWE-772):
zsh-5.5.1/Src/utils.c:7418: alloc_fn: Storage is returned from allocation function "appstr".
zsh-5.5.1/Src/string.c:200:5: alloc_fn: Storage is returned from allocation function "realloc".
zsh-5.5.1/Src/string.c:200:5: identity_transfer: Passing "realloc(base, strlen(base) + strlen(append) + 1UL)" as argument 1 to function "strcat", which returns that argument.
zsh-5.5.1/Src/string.c:200:5: return_alloc_fn: Directly returning storage allocated by "strcat".
zsh-5.5.1/Src/utils.c:7418: var_assign: Assigning: "dir" = storage returned from "appstr(dir, "/new")".
zsh-5.5.1/Src/utils.c:7419: noescape: Resource "dir" is not freed or pointed-to in "stat".
zsh-5.5.1/Src/utils.c:7419: leaked_storage: Variable "dir" going out of scope leaks the storage it points to.
7417| dir[plen] = 0;
7418| dir = appstr(dir, "/new");
7419|-> if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) return 0;
7420| st_ret.st_mtime = st_tmp.st_mtime;
7421|
---
Src/utils.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/Src/utils.c b/Src/utils.c
index b418517..492babc 100644
--- a/Src/utils.c
+++ b/Src/utils.c
@@ -7404,19 +7404,28 @@ mailstat(char *path, struct stat *st)
/* See if cur/ is present */
dir = appstr(ztrdup(path), "/cur");
- if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) return 0;
+ if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) {
+ zsfree(dir);
+ return 0;
+ }
st_ret.st_atime = st_tmp.st_atime;
/* See if tmp/ is present */
dir[plen] = 0;
dir = appstr(dir, "/tmp");
- if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) return 0;
+ if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) {
+ zsfree(dir);
+ return 0;
+ }
st_ret.st_mtime = st_tmp.st_mtime;
/* And new/ */
dir[plen] = 0;
dir = appstr(dir, "/new");
- if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) return 0;
+ if (stat(dir, &st_tmp) || !S_ISDIR(st_tmp.st_mode)) {
+ zsfree(dir);
+ return 0;
+ }
st_ret.st_mtime = st_tmp.st_mtime;
#if THERE_IS_EXACTLY_ONE_MAILDIR_IN_MAILPATH
@@ -7428,6 +7437,7 @@ mailstat(char *path, struct stat *st)
st_tmp.st_atime == st_new_last.st_atime &&
st_tmp.st_mtime == st_new_last.st_mtime) {
*st = st_ret_last;
+ zsfree(dir);
return 0;
}
st_new_last = st_tmp;
--
2.17.2

8
zsh.spec
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@ -1,7 +1,7 @@
Summary: Powerful interactive shell
Name: zsh
Version: 5.6.2
Release: 1%{?dist}
Release: 2%{?dist}
License: MIT
URL: http://zsh.sourceforge.net/
Source0: https://downloads.sourceforge.net/%{name}/%{name}-%{version}.tar.xz
@ -12,6 +12,9 @@ Source4: zshrc.rhs
Source5: zshenv.rhs
Source6: dotzshrc
# fix programming mistakes detected by static analysis
Patch2: 0002-zsh-5.5.1-static-analysis.patch
BuildRequires: autoconf
BuildRequires: coreutils
BuildRequires: gawk
@ -167,6 +170,9 @@ fi
%doc Doc/*.html
%changelog
* Mon Nov 12 2018 Kamil Dudka <kdudka@redhat.com> - 5.6.2-2
- fix programming mistakes detected by static analysis
* Fri Sep 14 2018 Kamil Dudka <kdudka@redhat.com> - 5.6.2-1
- update to latest upstream release