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pattern_match_linux.cocci
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pattern_match_linux.cocci
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//define global variable
@script:python@
count << virtual.count;
@@
#-----------------------------Post Matching Process------------------------------
def print_and_log(filename,first,second,count):
print "No. ", count, " file: ", filename
print "--first fetch: line ",first
print "--second fetch: line ",second
print "------------------------------------\n"
logfile = open('result.txt','a')
logfile.write("No." + count + " File: \n" + str(filename) + "\n")
logfile.write("--first fetch: line " + str(first) + "\n")
logfile.write("--second fetch: line " + str(second) + "\n")
logfile.write("-------------------------------\n")
logfile.close()
def post_match_process(p1,p2,src,ptr,count):
filename = p1[0].file
first = p1[0].line
second = p2[0].line
src_str = str(src)
ptr_str = str(ptr)
#print "src1:", src_str
#print "src2:", ptr_str
#print "first:", first
#print "second:", second
# remove loop case, first and second fetch are not supposed to be in the same line.
if first == second:
return
# remove reverse loop case, where first fetch behand second fetch but in last loop .
if int(first) > int(second):
return
# remove case of get_user(a, src++) or get_user(a, src + 4)
if src_str.find("+") != -1 or ptr_str.find("+") != -1:
return
# remove case of get_user(a, src[i])
if src_str.find("[") != -1 or ptr_str.find("[") != -1:
return
# remove case of get_user(a, src--) or get_user(a, src - 4)
if src_str.find("-") != -1 and src_str.find("->") == -1:
return
if ptr_str.find("-") != -1 and ptr_str.find("->") == -1:
return
# remove false matching of src ===> (int*)src , but leave function call like u64_to_uptr(ctl_sccb.sccb)
if src_str.find("(") == 0 or ptr_str.find("(") == 0:
return
if count:
count = str(int(count) + 1)
else:
count = "1"
print_and_log(filename, first, second, count)
return count
//---------------------Pattern Matching Rules-----------------------------------
//----------------------------------- case 1: normal case without src assignment
@ rule1 disable drop_cast exists @
expression addr,exp1,exp2,src,size1,size2,offset;
position p1,p2;
identifier func;
type T1,T2;
@@
func(...){
...
(
get_user(exp1, (T1)src)@p1
|
get_user(exp1, src)@p1
|
__get_user(exp1, (T1)src)@p1
|
__get_user(exp1, src)@p1
|
copy_from_user(exp1, (T1)src, size1)@p1
|
copy_from_user(exp1, src, size1)@p1
|
__copy_from_user(exp1, (T1)src, size1)@p1
|
__copy_from_user(exp1, src, size1)@p1
)
... when any
when != src += offset
when != src = src + offset
when != src++
when != src -=offset
when != src = src - offset
when != src--
when != src = addr
(
get_user(exp2, (T2)src)@p2
|
get_user(exp2, src)@p2
|
__get_user(exp2,(T2)src)@p2
|
__get_user(exp2, src)@p2
|
__copy_from_user(exp2,(T2)src,size2)@p2
|
__copy_from_user(exp2, src,size2)@p2
|
copy_from_user(exp2,(T2)src,size2)@p2
|
copy_from_user(exp2, src,size2)@p2
)
...
}
@script:python@
p11 << rule1.p1;
p12 << rule1.p2;
s1 << rule1.src;
@@
print "src1:", str(s1)
if p11 and p12:
coccilib.report.print_report(p11[0],"rule1 First fetch")
coccilib.report.print_report(p12[0],"rule1 Second fetch")
ret = post_match_process(p11, p12, s1, s1, count)
if ret:
count = ret
//--------------------------------------- case 2: ptr = src at beginning, ptr first
@ rule2 disable drop_cast exists @
identifier func;
expression addr,exp1,exp2,src,ptr,size1,size2,offset;
position p0,p1,p2;
type T0,T1,T2;
@@
func(...){
...
(
ptr = (T0)src@p0 // potential assignment case
|
ptr = src@p0
)
...
(
get_user(exp1, (T1)ptr)@p1
|
get_user(exp1, ptr)@p1
|
__get_user(exp1, (T1)ptr)@p1
|
__get_user(exp1, ptr)@p1
|
copy_from_user(exp1, (T1)ptr,size1)@p1
|
copy_from_user(exp1, ptr,size1)@p1
|
__copy_from_user(exp1, (T1)ptr,size1)@p1
|
__copy_from_user(exp1, ptr,size1)@p1
)
...
when != src += offset
when != src = src + offset
when != src++
when != src -=offset
when != src = src - offset
when != src--
when != src = addr
(
get_user(exp2, (T2)src)@p2
|
get_user(exp2, src)@p2
|
__get_user(exp2,(T2)src)@p2
|
__get_user(exp2, src)@p2
|
__copy_from_user(exp2,(T2)src,size2)@p2
|
__copy_from_user(exp2, src,size2)@p2
|
copy_from_user(exp2,(T2)src,size2)@p2
|
copy_from_user(exp2, src,size2)@p2
)
...
}
@script:python@
p21 << rule2.p1;
p22 << rule2.p2;
p2 << rule2.ptr;
s2 << rule2.src;
@@
print "src2:", str(s2)
print "ptr2:", str(p2)
if p21 and p22:
coccilib.report.print_report(p21[0],"rule2 First fetch")
coccilib.report.print_report(p22[0],"rule2 Second fetch")
ret = post_match_process(p21, p22, s2, p2, count)
if ret:
count = ret
//--------------------------------------- case 3: ptr = src at beginning, src first
@ rule3 disable drop_cast exists @
identifier func;
expression addr,exp1,exp2,src,ptr,size1,size2,offset;
position p0,p1,p2;
type T0,T1,T2;
@@
func(...){
...
(
ptr = (T0)src@p0 // potential assignment case
|
ptr = src@p0
)
...
(
get_user(exp1, (T1)src)@p1
|
get_user(exp1, src)@p1
|
__get_user(exp1, (T1)src)@p1
|
__get_user(exp1, src)@p1
|
copy_from_user(exp1, (T1)src,size1)@p1
|
copy_from_user(exp1, src,size1)@p1
|
__copy_from_user(exp1, (T1)src,size1)@p1
|
__copy_from_user(exp1, src,size1)@p1
)
...
when != ptr += offset
when != ptr = ptr + offset
when != ptr++
when != ptr -=offset
when != ptr = ptr - offset
when != ptr--
when != ptr = addr
(
get_user(exp2, (T2)ptr)@p2
|
get_user(exp2, ptr)@p2
|
__get_user(exp2,(T2)ptr)@p2
|
__get_user(exp2, ptr)@p2
|
__copy_from_user(exp2,(T2)ptr,size2)@p2
|
__copy_from_user(exp2, ptr,size2)@p2
|
copy_from_user(exp2,(T2)ptr,size2)@p2
|
copy_from_user(exp2, ptr,size2)@p2
)
...
}
@script:python@
p31 << rule3.p1;
p32 << rule3.p2;
p3 << rule3.ptr;
s3 << rule3.src;
@@
print "src3:", str(s3)
print "ptr3:", str(p3)
if p31 and p32:
coccilib.report.print_report(p31[0],"rule3 First fetch")
coccilib.report.print_report(p32[0],"rule3 Second fetch")
ret = post_match_process(p31, p32, s3, p3, count)
if ret:
count = ret
//----------------------------------- case 4: ptr = src at middle
@ rule4 disable drop_cast exists @
identifier func;
expression addr,exp1,exp2,src,ptr,size1,size2,offset;
position p0,p1,p2;
type T0,T1,T2;
@@
func(...){
...
(
get_user(exp1, (T1)src)@p1
|
get_user(exp1, src)@p1
|
__get_user(exp1, (T1)src)@p1
|
__get_user(exp1, src)@p1
|
copy_from_user(exp1, (T1)src,size1)@p1
|
copy_from_user(exp1, src,size1)@p1
|
__copy_from_user(exp1, (T1)src,size1)@p1
|
__copy_from_user(exp1, src,size1)@p1
)
...
when != src += offset
when != src = src + offset
when != src++
when != src -=offset
when != src = src - offset
when != src--
when != src = addr
(
ptr = (T0)src@p0 // potential assignment case
|
ptr = src@p0
)
...
when != ptr += offset
when != ptr = ptr + offset
when != ptr++
when != ptr -=offset
when != ptr = ptr - offset
when != ptr--
when != ptr = addr
(
get_user(exp2, (T2)ptr)@p2
|
get_user(exp2, ptr)@p2
|
__get_user(exp2,(T2)ptr)@p2
|
__get_user(exp2, ptr)@p2
|
__copy_from_user(exp2,(T2)ptr,size2)@p2
|
__copy_from_user(exp2, ptr,size2)@p2
|
copy_from_user(exp2,(T2)ptr,size2)@p2
|
copy_from_user(exp2, ptr,size2)@p2
)
...
}
@script:python@
p41 << rule4.p1;
p42 << rule4.p2;
p4 << rule4.ptr;
s4 << rule4.src;
@@
print "src4:", str(s4)
print "ptr4:", str(p4)
if p41 and p42:
coccilib.report.print_report(p41[0],"rule4 First fetch")
coccilib.report.print_report(p42[0],"rule4 Second fetch")
ret = post_match_process(p41, p42, s4, p4, count)
if ret:
count = ret
//----------------------------------- case 5: first element, then ptr, copy from structure
@ rule5 disable drop_cast exists @
identifier func, e1;
expression addr,exp1,exp2,src,size1,size2,offset;
position p1,p2;
type T1,T2;
@@
func(...){
...
(
get_user(exp1, (T1)src->e1)@p1
|
get_user(exp1, src->e1)@p1
|
get_user(exp1, &(src->e1))@p1
|
__get_user(exp1, (T1)src->e1)@p1
|
__get_user(exp1, src->e1)@p1
|
__get_user(exp1, &(src->e1))@p1
|
copy_from_user(exp1, (T1)src->e1,size1)@p1
|
copy_from_user(exp1, src->e1,size1)@p1
|
copy_from_user(exp1, &(src->e1),size1)@p1
|
__copy_from_user(exp1, (T1)src->e1,size1)@p1
|
__copy_from_user(exp1, src->e1,size1)@p1
|
__copy_from_user(exp1, &(src->e1),size1)@p1
)
...
when != src += offset
when != src = src + offset
when != src++
when != src -=offset
when != src = src - offset
when != src--
when != src = addr
(
get_user(exp2,(T2)src)@p2
|
get_user(exp2,src)@p2
|
__get_user(exp2,(T2)src)@p2
|
__get_user(exp2,src)@p2
|
__copy_from_user(exp2,(T2)src,size2)@p2
|
__copy_from_user(exp2,src,size2)@p2
|
copy_from_user(exp2,(T2)src,size2)@p2
|
copy_from_user(exp2,src,size2)@p2
)
...
}
@script:python@
p51 << rule5.p1;
p52 << rule5.p2;
s5 << rule5.src;
e5 << rule5.e1;
@@
print "src5:", str(s5)
print "e5:", str(e5)
if p51 and p52:
coccilib.report.print_report(p51[0],"rule5 First fetch")
coccilib.report.print_report(p52[0],"rule5 Second fetch")
ret = post_match_process(p51, p52, s5, e5, count)
if ret:
count = ret
//----------------------------------- case 6: first element, then ptr, copy from pointer
@ rule6 disable drop_cast exists @
identifier func, e1;
expression addr,exp1,exp2,src,size1,size2,offset;
position p1,p2;
type T1,T2;
@@
func(...){
...
(
get_user(exp1, (T1)src.e1)@p1
|
get_user(exp1, src.e1)@p1
|
get_user(exp1, &(src.e1))@p1
|
__get_user(exp1, (T1)src.e1)@p1
|
__get_user(exp1, src.e1)@p1
|
__get_user(exp1, &(src.e1))@p1
|
copy_from_user(exp1, (T1)src.e1, size1)@p1
|
copy_from_user(exp1, src.e1, size1)@p1
|
copy_from_user(exp1, &(src.e1), size1)@p1
|
__copy_from_user(exp1, (T1)src.e1, size1)@p1
|
__copy_from_user(exp1, src.e1, size1)@p1
|
__copy_from_user(exp1, &(src.e1), size1)@p1
)
...
when != &src += offset
when != &src = &src + offset
when != &src++
when != &src -=offset
when != &src = &src - offset
when != &src--
when != &src = &addr
(
get_user(exp2,(T2)&src)@p2
|
get_user(exp2,&src)@p2
|
__get_user(exp2,(T2)&src)@p2
|
__get_user(exp2,&src)@p2
|
__copy_from_user(exp2,(T2)&src,size2)@p2
|
__copy_from_user(exp2,&src,size2)@p2
|
copy_from_user(exp2,(T2)&src,size2)@p2
|
copy_from_user(exp2,&src,size2)@p2
)
...
}
@script:python@
p61 << rule6.p1;
p62 << rule6.p2;
s6 << rule6.src;
e6 << rule6.e1;
@@
print "src6:", str(s6)
print "e6:", str(e6)
if p61 and p62:
coccilib.report.print_report(p61[0],"rule6 First fetch")
coccilib.report.print_report(p62[0],"rule6 Second fetch")
ret = post_match_process(p61, p62, s6, e6, count)
if ret:
count = ret