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Code Issues Releases Activity

Fix translation block local denial of service vulnerability

Browse Source 
Obtained from:	qemu cvs
Security:	http://www.freebsd.org/ports/portaudit/30f5ca1d-a90b-11dc-bf13-0211060005df.html
This commit is contained in:
Juergen Lock 2007-12-13 01:10:53 +00:00
parent c45ff3e5a1
commit 62d040db7a
Notes: svn2git 2021-03-31 03:12:20 +00:00 
svn path=/head/; revision=203428
4 changed files with 186 additions and 1 deletions
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1
emulators/qemu-devel/Makefile
View File

@ -7,6 +7,7 @@
PORTNAME= qemu
PORTVERSION= 0.9.0s.20070802
PORTREVISION= 1
CATEGORIES= emulators
MASTER_SITES= http://qemu.org/:release \
http://qemu-forum.ipi.fi/qemu-snapshots/:snapshot \

92
emulators/qemu-devel/files/patch-tlb-vuln Normal file
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@ -0,0 +1,92 @@
Index: qemu/cpu-exec.c
diff -u qemu/cpu-exec.c:1.128 qemu/cpu-exec.c:1.129
--- qemu/cpu-exec.c:1.128 Sun Dec 2 06:18:23 2007
+++ qemu/cpu-exec.c Tue Dec 11 19:35:45 2007
@@ -133,7 +133,7 @@
tb->tc_ptr = tc_ptr;
tb->cs_base = cs_base;
tb->flags = flags;
- cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
+ cpu_gen_code(env, tb, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */
Index: qemu/exec-all.h
diff -u qemu/exec-all.h:1.72 qemu/exec-all.h:1.73
--- qemu/exec-all.h:1.72 Mon Nov 19 00:38:33 2007
+++ qemu/exec-all.h Tue Dec 11 19:35:45 2007
@@ -64,8 +64,9 @@
int gen_intermediate_code(CPUState *env, struct TranslationBlock *tb);
int gen_intermediate_code_pc(CPUState *env, struct TranslationBlock *tb);
void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf);
+unsigned long code_gen_max_block_size(void);
int cpu_gen_code(CPUState *env, struct TranslationBlock *tb,
- int max_code_size, int *gen_code_size_ptr);
+ int *gen_code_size_ptr);
int cpu_restore_state(struct TranslationBlock *tb,
CPUState *env, unsigned long searched_pc,
void *puc);
@@ -94,7 +95,6 @@
return tlb_set_page_exec(env, vaddr, paddr, prot, mmu_idx, is_softmmu);
}
-#define CODE_GEN_MAX_SIZE 65536
#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
#define CODE_GEN_PHYS_HASH_BITS 15
Index: qemu/exec.c
diff -u qemu/exec.c:1.117 qemu/exec.c:1.118
--- qemu/exec.c:1.117 Sun Dec 9 02:22:56 2007
+++ qemu/exec.c Tue Dec 11 19:35:45 2007
@@ -56,7 +56,7 @@
#endif
/* threshold to flush the translated code buffer */
-#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
+#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - code_gen_max_block_size())
#define SMC_BITMAP_USE_THRESHOLD 10
@@ -622,7 +622,7 @@
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;
- cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
+ cpu_gen_code(env, tb, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */
Index: qemu/translate-all.c
diff -u qemu/translate-all.c:1.23 qemu/translate-all.c:1.24
--- qemu/translate-all.c:1.23 Sun Dec 2 06:10:02 2007
+++ qemu/translate-all.c Tue Dec 11 19:35:45 2007
@@ -132,14 +132,27 @@
}
}
+unsigned long code_gen_max_block_size(void)
+{
+ static unsigned long max;
+
+ if (max == 0) {
+#define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
+#include "opc.h"
+#undef DEF
+ max *= OPC_MAX_SIZE;
+ }
+
+ return max;
+}
+
/* return non zero if the very first instruction is invalid so that
the virtual CPU can trigger an exception.
'*gen_code_size_ptr' contains the size of the generated code (host
code).
*/
-int cpu_gen_code(CPUState *env, TranslationBlock *tb,
- int max_code_size, int *gen_code_size_ptr)
+int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
{
uint8_t *gen_code_buf;
int gen_code_size;

2
emulators/qemu/Makefile
View File

@ -7,7 +7,7 @@
PORTNAME= qemu
PORTVERSION= 0.9.0
PORTREVISION= 3
PORTREVISION= 4
CATEGORIES= emulators
MASTER_SITES= http://fabrice.bellard.free.fr/qemu/:release \
http://qemu.org/:release \

92
emulators/qemu/files/patch-tlb-vuln Normal file
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@ -0,0 +1,92 @@
Index: qemu/cpu-exec.c
diff -u qemu/cpu-exec.c:1.128 qemu/cpu-exec.c:1.129
--- qemu/cpu-exec.c:1.128 Sun Dec 2 06:18:23 2007
+++ qemu/cpu-exec.c Tue Dec 11 19:35:45 2007
@@ -133,7 +133,7 @@
tb->tc_ptr = tc_ptr;
tb->cs_base = cs_base;
tb->flags = flags;
- cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
+ cpu_gen_code(env, tb, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */
Index: qemu/exec-all.h
diff -u qemu/exec-all.h:1.72 qemu/exec-all.h:1.73
--- qemu/exec-all.h:1.72 Mon Nov 19 00:38:33 2007
+++ qemu/exec-all.h Tue Dec 11 19:35:45 2007
@@ -64,8 +64,9 @@
int gen_intermediate_code(CPUState *env, struct TranslationBlock *tb);
int gen_intermediate_code_pc(CPUState *env, struct TranslationBlock *tb);
void dump_ops(const uint16_t *opc_buf, const uint32_t *opparam_buf);
+unsigned long code_gen_max_block_size(void);
int cpu_gen_code(CPUState *env, struct TranslationBlock *tb,
- int max_code_size, int *gen_code_size_ptr);
+ int *gen_code_size_ptr);
int cpu_restore_state(struct TranslationBlock *tb,
CPUState *env, unsigned long searched_pc,
void *puc);
@@ -94,7 +95,6 @@
return tlb_set_page_exec(env, vaddr, paddr, prot, mmu_idx, is_softmmu);
}
-#define CODE_GEN_MAX_SIZE 65536
#define CODE_GEN_ALIGN 16 /* must be >= of the size of a icache line */
#define CODE_GEN_PHYS_HASH_BITS 15
Index: qemu/exec.c
diff -u qemu/exec.c:1.117 qemu/exec.c:1.118
--- qemu/exec.c:1.117 Sun Dec 9 02:22:56 2007
+++ qemu/exec.c Tue Dec 11 19:35:45 2007
@@ -56,7 +56,7 @@
#endif
/* threshold to flush the translated code buffer */
-#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - CODE_GEN_MAX_SIZE)
+#define CODE_GEN_BUFFER_MAX_SIZE (CODE_GEN_BUFFER_SIZE - code_gen_max_block_size())
#define SMC_BITMAP_USE_THRESHOLD 10
@@ -622,7 +622,7 @@
tb->cs_base = cs_base;
tb->flags = flags;
tb->cflags = cflags;
- cpu_gen_code(env, tb, CODE_GEN_MAX_SIZE, &code_gen_size);
+ cpu_gen_code(env, tb, &code_gen_size);
code_gen_ptr = (void *)(((unsigned long)code_gen_ptr + code_gen_size + CODE_GEN_ALIGN - 1) & ~(CODE_GEN_ALIGN - 1));
/* check next page if needed */
Index: qemu/translate-all.c
diff -u qemu/translate-all.c:1.23 qemu/translate-all.c:1.24
--- qemu/translate-all.c:1.23 Sun Dec 2 06:10:02 2007
+++ qemu/translate-all.c Tue Dec 11 19:35:45 2007
@@ -132,14 +132,27 @@
}
}
+unsigned long code_gen_max_block_size(void)
+{
+ static unsigned long max;
+
+ if (max == 0) {
+#define DEF(s, n, copy_size) max = copy_size > max? copy_size : max;
+#include "opc.h"
+#undef DEF
+ max *= OPC_MAX_SIZE;
+ }
+
+ return max;
+}
+
/* return non zero if the very first instruction is invalid so that
the virtual CPU can trigger an exception.
'*gen_code_size_ptr' contains the size of the generated code (host
code).
*/
-int cpu_gen_code(CPUState *env, TranslationBlock *tb,
- int max_code_size, int *gen_code_size_ptr)
+int cpu_gen_code(CPUState *env, TranslationBlock *tb, int *gen_code_size_ptr)
{
uint8_t *gen_code_buf;
int gen_code_size;