02c21b3ef9
Fix https://llvm.org/bugs/show_bug.cgi?id=27673. Currenty ASan checks the return value of real recv/recvfrom to see if the written bytes fit in the buffer. That works fine most of time. However, there is an exception: (from the RECV(2) man page) MSG_TRUNC (since Linux 2.2) ... return the real length of the packet or datagram, even when it was longer than the passed buffer. ... Some programs combine MSG_TRUNC, MSG_PEEK and a single-byte buffer to peek the incoming data size without reading (much of) them. In this case, the return value is usually longer than what's been written and ASan raises a false alarm here. To avoid such false positive reports, we can use min(res, len) in COMMON_INTERCEPTOR_WRITE_RANGE checks. Differential Revision: http://reviews.llvm.org/D20280 llvm-svn: 269749
37 lines
958 B
C++
37 lines
958 B
C++
// Test that ASan doesn't raise false alarm when MSG_TRUNC is present.
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//
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// RUN: %clangxx %s -o %t && %run %t 2>&1
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//
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// UNSUPPORTED: android
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/ip.h>
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#include <assert.h>
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int main() {
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int fd_0 = socket(AF_INET, SOCK_DGRAM, 0);
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int fd_1 = socket(AF_INET, SOCK_DGRAM, 0);
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struct sockaddr_in sin;
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socklen_t len = sizeof(sin);
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char *buf = (char *)malloc(1);
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sin.sin_family = AF_INET;
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// Choose a random port to bind.
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sin.sin_port = 0;
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sin.sin_addr.s_addr = INADDR_ANY;
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assert(bind(fd_1, (struct sockaddr *)&sin, sizeof(sin)) == 0);
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// Get the address and port binded.
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assert(getsockname(fd_1, (struct sockaddr *)&sin, &len) == 0);
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assert(sendto(fd_0, "hello", strlen("hello"), MSG_DONTWAIT,
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(struct sockaddr *)&sin, sizeof(sin)) != -1);
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assert(recv(fd_1, buf, 1, MSG_TRUNC) != -1);
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free(buf);
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return 0;
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}
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