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authorAlan Modra <amodra@gmail.com>2021-11-03 16:21:42 +1030
committerAlan Modra <amodra@gmail.com>2021-11-03 17:06:09 +1030
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tree334807cc63fe61af871283a11915462a4071e924 /contrib
parent3a275541049f295719782642fb8aa912b0a4a0d3 (diff)
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asan: dlltool buffer overflow: embedded NUL in string
yyleng gives the pattern length, xstrdup just copies up to the NUL. So it is quite possible writing at an index of yyleng-2 overflows the xstrdup allocated string buffer. xmemdup quite handily avoids this problem, even writing the terminating NUL over the trailing quote. Use it in ldlex.l too where we'd already had a report of this problem and fixed it by hand, and to implement xmemdup0 in gas. binutils/ * deflex.l (single and double quote strings): Use xmemdup. gas/ * as.h (xmemdup0): Use xmemdup. ld/ PR 20906 * ldlex.l (double quote string): Use xmemdup.
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