Rebase on db0f2f382e31 at SELinuxProject
- Optimize storage of filename transitions - Fix signed overflow caused by using (1 << 31) - 1
This commit is contained in:
Petr Lautrbach
parent
611818c50a
commit
497bda00f7
129
0001-libsepol-checkpolicy-optimize-storage-of-filename-tr.patch
Normal file
129
0001-libsepol-checkpolicy-optimize-storage-of-filename-tr.patch
Normal file
@ -0,0 +1,129 @@
|
|||||||
|
From 42ae834a7428c57f7b2a9f448adf4cf991fa3487 Mon Sep 17 00:00:00 2001
|
||||||
|
From: Ondrej Mosnacek <omosnace@redhat.com>
|
||||||
|
Date: Fri, 31 Jul 2020 13:10:34 +0200
|
||||||
|
Subject: [PATCH] libsepol,checkpolicy: optimize storage of filename
|
||||||
|
transitions
|
||||||
|
|
||||||
|
In preparation to support a new policy format with a more optimal
|
||||||
|
representation of filename transition rules, this patch applies an
|
||||||
|
equivalent change from kernel commit c3a276111ea2 ("selinux: optimize
|
||||||
|
storage of filename transitions").
|
||||||
|
|
||||||
|
See the kernel commit's description [1] for the rationale behind this
|
||||||
|
representation. This change doesn't bring any measurable difference of
|
||||||
|
policy build performance (semodule -B) on Fedora.
|
||||||
|
|
||||||
|
[1] https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git/commit/?id=c3a276111ea2572399281988b3129683e2a6b60b
|
||||||
|
|
||||||
|
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
|
||||||
|
---
|
||||||
|
checkpolicy/policy_define.c | 49 ++++++++++---------------------------
|
||||||
|
checkpolicy/test/dispol.c | 20 ++++++++++-----
|
||||||
|
2 files changed, 27 insertions(+), 42 deletions(-)
|
||||||
|
|
||||||
|
diff --git a/checkpolicy/policy_define.c b/checkpolicy/policy_define.c
|
||||||
|
index c6733fa469c5..395f62284e3c 100644
|
||||||
|
--- a/checkpolicy/policy_define.c
|
||||||
|
+++ b/checkpolicy/policy_define.c
|
||||||
|
@@ -3303,8 +3303,6 @@ int define_filename_trans(void)
|
||||||
|
ebitmap_t e_stypes, e_ttypes;
|
||||||
|
ebitmap_t e_tclasses;
|
||||||
|
ebitmap_node_t *snode, *tnode, *cnode;
|
||||||
|
- filename_trans_t *ft;
|
||||||
|
- filename_trans_datum_t *ftdatum;
|
||||||
|
filename_trans_rule_t *ftr;
|
||||||
|
type_datum_t *typdatum;
|
||||||
|
uint32_t otype;
|
||||||
|
@@ -3388,40 +3386,19 @@ int define_filename_trans(void)
|
||||||
|
ebitmap_for_each_positive_bit(&e_tclasses, cnode, c) {
|
||||||
|
ebitmap_for_each_positive_bit(&e_stypes, snode, s) {
|
||||||
|
ebitmap_for_each_positive_bit(&e_ttypes, tnode, t) {
|
||||||
|
- ft = calloc(1, sizeof(*ft));
|
||||||
|
- if (!ft) {
|
||||||
|
- yyerror("out of memory");
|
||||||
|
- goto bad;
|
||||||
|
- }
|
||||||
|
- ft->stype = s+1;
|
||||||
|
- ft->ttype = t+1;
|
||||||
|
- ft->tclass = c+1;
|
||||||
|
- ft->name = strdup(name);
|
||||||
|
- if (!ft->name) {
|
||||||
|
- yyerror("out of memory");
|
||||||
|
- goto bad;
|
||||||
|
- }
|
||||||
|
-
|
||||||
|
- ftdatum = hashtab_search(policydbp->filename_trans,
|
||||||
|
- (hashtab_key_t)ft);
|
||||||
|
- if (ftdatum) {
|
||||||
|
- yyerror2("duplicate filename transition for: filename_trans %s %s %s:%s",
|
||||||
|
- name,
|
||||||
|
- policydbp->p_type_val_to_name[s],
|
||||||
|
- policydbp->p_type_val_to_name[t],
|
||||||
|
- policydbp->p_class_val_to_name[c]);
|
||||||
|
- goto bad;
|
||||||
|
- }
|
||||||
|
-
|
||||||
|
- ftdatum = calloc(1, sizeof(*ftdatum));
|
||||||
|
- if (!ftdatum) {
|
||||||
|
- yyerror("out of memory");
|
||||||
|
- goto bad;
|
||||||
|
- }
|
||||||
|
- rc = hashtab_insert(policydbp->filename_trans,
|
||||||
|
- (hashtab_key_t)ft,
|
||||||
|
- ftdatum);
|
||||||
|
- if (rc) {
|
||||||
|
+ rc = policydb_filetrans_insert(
|
||||||
|
+ policydbp, s+1, t+1, c+1, name,
|
||||||
|
+ NULL, otype, NULL
|
||||||
|
+ );
|
||||||
|
+ if (rc != SEPOL_OK) {
|
||||||
|
+ if (rc == SEPOL_EEXIST) {
|
||||||
|
+ yyerror2("duplicate filename transition for: filename_trans %s %s %s:%s",
|
||||||
|
+ name,
|
||||||
|
+ policydbp->p_type_val_to_name[s],
|
||||||
|
+ policydbp->p_type_val_to_name[t],
|
||||||
|
+ policydbp->p_class_val_to_name[c]);
|
||||||
|
+ goto bad;
|
||||||
|
+ }
|
||||||
|
yyerror("out of memory");
|
||||||
|
goto bad;
|
||||||
|
}
|
||||||
|
diff --git a/checkpolicy/test/dispol.c b/checkpolicy/test/dispol.c
|
||||||
|
index d72d9fb331cf..8785b7252824 100644
|
||||||
|
--- a/checkpolicy/test/dispol.c
|
||||||
|
+++ b/checkpolicy/test/dispol.c
|
||||||
|
@@ -335,17 +335,25 @@ static int filenametr_display(hashtab_key_t key,
|
||||||
|
hashtab_datum_t datum,
|
||||||
|
void *ptr)
|
||||||
|
{
|
||||||
|
- struct filename_trans *ft = (struct filename_trans *)key;
|
||||||
|
+ struct filename_trans_key *ft = (struct filename_trans_key *)key;
|
||||||
|
struct filename_trans_datum *ftdatum = datum;
|
||||||
|
struct filenametr_display_args *args = ptr;
|
||||||
|
policydb_t *p = args->p;
|
||||||
|
FILE *fp = args->fp;
|
||||||
|
+ ebitmap_node_t *node;
|
||||||
|
+ uint32_t bit;
|
||||||
|
+
|
||||||
|
+ do {
|
||||||
|
+ ebitmap_for_each_positive_bit(&ftdatum->stypes, node, bit) {
|
||||||
|
+ display_id(p, fp, SYM_TYPES, bit, "");
|
||||||
|
+ display_id(p, fp, SYM_TYPES, ft->ttype - 1, "");
|
||||||
|
+ display_id(p, fp, SYM_CLASSES, ft->tclass - 1, ":");
|
||||||
|
+ display_id(p, fp, SYM_TYPES, ftdatum->otype - 1, "");
|
||||||
|
+ fprintf(fp, " %s\n", ft->name);
|
||||||
|
+ }
|
||||||
|
+ ftdatum = ftdatum->next;
|
||||||
|
+ } while (ftdatum);
|
||||||
|
|
||||||
|
- display_id(p, fp, SYM_TYPES, ft->stype - 1, "");
|
||||||
|
- display_id(p, fp, SYM_TYPES, ft->ttype - 1, "");
|
||||||
|
- display_id(p, fp, SYM_CLASSES, ft->tclass - 1, ":");
|
||||||
|
- display_id(p, fp, SYM_TYPES, ftdatum->otype - 1, "");
|
||||||
|
- fprintf(fp, " %s\n", ft->name);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
--
|
||||||
|
2.29.0
|
||||||
|
|
||||||
@ -0,0 +1,90 @@
|
|||||||
|
From 521e6a2f478a4c7a7c198c017d4d12e8667d89e7 Mon Sep 17 00:00:00 2001
|
||||||
|
From: Nicolas Iooss <nicolas.iooss@m4x.org>
|
||||||
|
Date: Sat, 3 Oct 2020 15:19:08 +0200
|
||||||
|
Subject: [PATCH] libsepol/cil: fix signed overflow caused by using (1 << 31) -
|
||||||
|
1
|
||||||
|
|
||||||
|
When compiling SELinux userspace tools with -ftrapv (this option
|
||||||
|
generates traps for signed overflow on addition, subtraction,
|
||||||
|
multiplication operations, instead of silently wrapping around),
|
||||||
|
semodule crashes when running the tests from
|
||||||
|
scripts/ci/fedora-test-runner.sh in a Fedora 32 virtual machine:
|
||||||
|
|
||||||
|
[root@localhost selinux-testsuite]# make test
|
||||||
|
make -C policy load
|
||||||
|
make[1]: Entering directory '/root/selinux-testsuite/policy'
|
||||||
|
# Test for "expand-check = 0" in /etc/selinux/semanage.conf
|
||||||
|
# General policy build
|
||||||
|
make[2]: Entering directory '/root/selinux-testsuite/policy/test_policy'
|
||||||
|
Compiling targeted test_policy module
|
||||||
|
Creating targeted test_policy.pp policy package
|
||||||
|
rm tmp/test_policy.mod.fc
|
||||||
|
make[2]: Leaving directory '/root/selinux-testsuite/policy/test_policy'
|
||||||
|
# General policy load
|
||||||
|
domain_fd_use --> off
|
||||||
|
/usr/sbin/semodule -i test_policy/test_policy.pp test_mlsconstrain.cil test_overlay_defaultrange.cil test_add_levels.cil test_glblub.cil
|
||||||
|
make[1]: *** [Makefile:174: load] Aborted (core dumped)
|
||||||
|
|
||||||
|
Using "coredumpctl gdb" leads to the following strack trace:
|
||||||
|
|
||||||
|
(gdb) bt
|
||||||
|
#0 0x00007f608fe4fa25 in raise () from /lib64/libc.so.6
|
||||||
|
#1 0x00007f608fe38895 in abort () from /lib64/libc.so.6
|
||||||
|
#2 0x00007f6090028aca in __addvsi3.cold () from /lib64/libsepol.so.1
|
||||||
|
#3 0x00007f6090096f59 in __avrule_xperm_setrangebits (low=30, high=30, xperms=0x8b9eea0)
|
||||||
|
at ../cil/src/cil_binary.c:1551
|
||||||
|
#4 0x00007f60900970dd in __cil_permx_bitmap_to_sepol_xperms_list (xperms=0xb650a30, xperms_list=0x7ffce2653b18)
|
||||||
|
at ../cil/src/cil_binary.c:1596
|
||||||
|
#5 0x00007f6090097286 in __cil_avrulex_ioctl_to_policydb (k=0xb8ec200 "@\023\214\022\006", datum=0xb650a30,
|
||||||
|
args=0x239a640) at ../cil/src/cil_binary.c:1649
|
||||||
|
#6 0x00007f609003f1e5 in hashtab_map (h=0x41f8710, apply=0x7f60900971da <__cil_avrulex_ioctl_to_policydb>,
|
||||||
|
args=0x239a640) at hashtab.c:234
|
||||||
|
#7 0x00007f609009ea19 in cil_binary_create_allocated_pdb (db=0x2394f10, policydb=0x239a640)
|
||||||
|
at ../cil/src/cil_binary.c:4969
|
||||||
|
#8 0x00007f609009d19d in cil_binary_create (db=0x2394f10, policydb=0x7ffce2653d30) at ../cil/src/cil_binary.c:4329
|
||||||
|
#9 0x00007f609008ec23 in cil_build_policydb_create_pdb (db=0x2394f10, sepol_db=0x7ffce2653d30)
|
||||||
|
at ../cil/src/cil.c:631
|
||||||
|
#10 0x00007f608fff4bf3 in semanage_direct_commit () from /lib64/libsemanage.so.1
|
||||||
|
#11 0x00007f608fff9fae in semanage_commit () from /lib64/libsemanage.so.1
|
||||||
|
#12 0x0000000000403e2b in main (argc=7, argv=0x7ffce2655058) at semodule.c:753
|
||||||
|
|
||||||
|
(gdb) f 3
|
||||||
|
#3 0x00007f6090096f59 in __avrule_xperm_setrangebits (low=30, high=30, xperms=0x8b9eea0)
|
||||||
|
at ../cil/src/cil_binary.c:1551
|
||||||
|
1551 xperms->perms[i] |= XPERM_SETBITS(h) - XPERM_SETBITS(low);
|
||||||
|
|
||||||
|
A signed integer overflow therefore occurs in XPERM_SETBITS(h):
|
||||||
|
|
||||||
|
#define XPERM_SETBITS(x) ((1 << (x & 0x1f)) - 1)
|
||||||
|
|
||||||
|
This macro is expanded with h=31, so "(1 << 31) - 1" is computed:
|
||||||
|
|
||||||
|
* (1 << 31) = -0x80000000 is the lowest signed 32-bit integer value
|
||||||
|
* (1 << 31) - 1 overflows the capacity of a signed 32-bit integer and
|
||||||
|
results in 0x7fffffff (which is unsigned)
|
||||||
|
|
||||||
|
Using unsigned integers (with "1U") fixes the crash, as
|
||||||
|
(1U << 31) = 0x80000000U has no overflowing issues.
|
||||||
|
|
||||||
|
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
|
||||||
|
Acked-by: Petr Lautrbach <plautrba@redhat.com>
|
||||||
|
---
|
||||||
|
checkpolicy/policy_define.c | 2 +-
|
||||||
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
||||||
|
|
||||||
|
diff --git a/checkpolicy/policy_define.c b/checkpolicy/policy_define.c
|
||||||
|
index 395f62284e3c..bf6c3e68bef3 100644
|
||||||
|
--- a/checkpolicy/policy_define.c
|
||||||
|
+++ b/checkpolicy/policy_define.c
|
||||||
|
@@ -2147,7 +2147,7 @@ out:
|
||||||
|
/* index of the u32 containing the permission */
|
||||||
|
#define XPERM_IDX(x) (x >> 5)
|
||||||
|
/* set bits 0 through x-1 within the u32 */
|
||||||
|
-#define XPERM_SETBITS(x) ((1 << (x & 0x1f)) - 1)
|
||||||
|
+#define XPERM_SETBITS(x) ((1U << (x & 0x1f)) - 1)
|
||||||
|
/* low value for this u32 */
|
||||||
|
#define XPERM_LOW(x) (x << 5)
|
||||||
|
/* high value for this u32 */
|
||||||
|
--
|
||||||
|
2.29.0
|
||||||
|
|
||||||
@ -1,5 +1,5 @@
|
|||||||
%define libselinuxver 3.1
|
%define libselinuxver 3.1-4
|
||||||
%define libsepolver 3.1
|
%define libsepolver 3.1-4
|
||||||
|
|
||||||
Summary: SELinux policy compiler
|
Summary: SELinux policy compiler
|
||||||
Name: checkpolicy
|
Name: checkpolicy
|
||||||
@ -12,6 +12,8 @@ Source0: https://github.com/SELinuxProject/selinux/releases/download/20200710/ch
|
|||||||
# $ git format-patch -N checkpolicy-3.1 -- checkpolicy
|
# $ git format-patch -N checkpolicy-3.1 -- checkpolicy
|
||||||
# $ i=1; for j in 00*patch; do printf "Patch%04d: %s\n" $i $j; i=$((i+1));done
|
# $ i=1; for j in 00*patch; do printf "Patch%04d: %s\n" $i $j; i=$((i+1));done
|
||||||
# Patch list start
|
# Patch list start
|
||||||
|
Patch0001: 0001-libsepol-checkpolicy-optimize-storage-of-filename-tr.patch
|
||||||
|
Patch0002: 0002-libsepol-cil-fix-signed-overflow-caused-by-using-1-3.patch
|
||||||
# Patch list end
|
# Patch list end
|
||||||
BuildRequires: gcc
|
BuildRequires: gcc
|
||||||
BuildRequires: byacc bison flex flex-static libsepol-static >= %{libsepolver} libselinux-devel >= %{libselinuxver}
|
BuildRequires: byacc bison flex flex-static libsepol-static >= %{libsepolver} libselinux-devel >= %{libselinuxver}
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user