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6b33c6f234
Add M_ZERO awareness to malloc() static analysis in Clang for FreeBSD, NetBSD, and OpenBSD in a similar fashion to O_CREAT for open(2). These systems have a three-argument malloc() in the kernel where the third argument contains flags; the M_ZERO flag will zero-initialize the allocated buffer. This should reduce the number of false positives when running static analysis on BSD kernels. Additionally, add kmalloc() (Linux kernel malloc()) and treat __GFP_ZERO like M_ZERO on Linux. Future work involves a better method of checking for named flags without hardcoding values. Patch by Conrad Meyer, with minor modifications by me. llvm-svn: 204832
59 lines
967 B
C
59 lines
967 B
C
// RUN: %clang -target x86_64-unknown-linux --analyze %s
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#include "Inputs/system-header-simulator.h"
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#define __GFP_ZERO 0x8000
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#define NULL ((void *)0)
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void *kmalloc(size_t, int);
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struct test {
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};
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void foo(struct test *);
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void test_zeroed() {
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struct test **list, *t;
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int i;
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list = kmalloc(sizeof(*list) * 10, __GFP_ZERO);
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if (list == NULL)
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return;
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for (i = 0; i < 10; i++) {
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t = list[i];
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foo(t);
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}
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free(list); // no-warning
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}
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void test_nonzero() {
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struct test **list, *t;
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int i;
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list = kmalloc(sizeof(*list) * 10, 0);
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if (list == NULL)
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return;
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for (i = 0; i < 10; i++) {
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t = list[i]; // expected-warning{{undefined}}
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foo(t);
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}
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free(list);
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}
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void test_indeterminate(int flags) {
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struct test **list, *t;
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int i;
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list = kmalloc(sizeof(*list) * 10, flags);
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if (list == NULL)
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return;
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for (i = 0; i < 10; i++) {
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t = list[i]; // expected-warning{{undefined}}
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foo(t);
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}
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free(list);
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}
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