[Buildroot] [Bug 11121] New: statfs call corrupts memory struct statfs too small
bugzilla at busybox.net
bugzilla at busybox.net
Thu Jun 28 19:15:41 UTC 2018
https://bugs.busybox.net/show_bug.cgi?id=11121
Bug ID: 11121
Summary: statfs call corrupts memory struct statfs too small
Product: buildroot
Version: unspecified
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: Other
Assignee: unassigned at buildroot.uclibc.org
Reporter: geoff at infradead.org
CC: buildroot at uclibc.org
Target Milestone: ---
Created attachment 7656
--> https://bugs.busybox.net/attachment.cgi?id=7656&action=edit
statfs test program
It seems there is a mismatch between the struct statfs used by libc and that
used by the arm64 kernel. The call to statfs() writes 120 bytes, but struct
statfs is only 88 bytes. The attached test program shows this.
I experienced seg faults due to stack corruption when calling statfs() with an
automatic struct statfs variable.
Building for arm64.
libuClibc-1.0.30
Using master at revision 751df64eb344eee6a583755de09d3d506ac2fe33.
The output of statfs-test program:
sizeof statfs: 88
sizeof packed: 138
1: 94 94
2: 19 19
3: 2 2
4: 1 1
5: 0 0
6: 0 0
7: 0 0
8: 0 0
9: 0 0
10: 10 10
11: 0 0
12: 0 0
13: 0 0
14: 0 0
15: 0 0
16: 0 0
17: 72 72
18: a5 a5
19: 7 7
20: 0 0
21: 0 0
22: 0 0
23: 0 0
24: 0 0
25: 83 83
26: 80 80
27: 7 7
28: 0 0
29: 0 0
30: 0 0
31: 0 0
32: 0 0
33: 83 83
34: 80 80
35: 7 7
36: 0 0
37: 0 0
38: 0 0
39: 0 0
40: 0 0
41: 72 72
42: a5 a5
43: 7 7
44: 0 0
45: 0 0
46: 0 0
47: 0 0
48: 0 0
49: d9 d9
50: a0 a0
51: 7 7
52: 0 0
53: 0 0
54: 0 0
55: 0 0
56: 0 0
57: 0 0
58: 0 0
59: 0 0
60: 0 0
61: 0 0
62: 0 0
63: 0 0
64: 0 0
65: ff ff
66: 0 0
67: 0 0
68: 0 0
69: 0 0
70: 0 0
71: 0 0
72: 0 0
73: 0 0
74: 10 10
75: 0 0
76: 0 0
77: 0 0
78: 0 0
79: 0 0
80: 0 0
81: 20 20
82: 0 0
83: 0 0
84: 0 0
85: 0 0
86: 0 0
87: 0 0
88: 0 0
89: 0 0
90: 0 0
91: 0 0
92: 0 0
93: 0 0
94: 0 0
95: 0 0
96: 0 0
97: 0 0
98: 0 0
99: 0 0
100: 0 0
101: 0 0
102: 0 0
103: 0 0
104: 0 0
105: 0 0
106: 0 0
107: 0 0
108: 0 0
109: 0 0
110: 0 0
111: 0 0
112: 0 0
113: 0 0
114: 0 0
115: 0 0
116: 0 0
117: 0 0
118: 0 0
119: 0 0
120: 0 0
121: ff cc
122: ff cc
123: ff cc
124: ff cc
125: ff cc
126: ff cc
127: ff cc
128: ff cc
129: ff cc
130: ff cc
131: ff cc
132: ff cc
133: ff cc
134: ff cc
135: ff cc
136: ff cc
137: ff cc
138: ff cc
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