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parse.mk revision 1.8 
      1 # $NetBSD: parse.mk,v 1.8 2025/06/28 22:39:29 rillig Exp $
      2 #
      3 # Test those parts of the parsing that do not belong in any of the other
      4 # categories.
      5 
      6 # expect+1: Invalid line "<<<<<< old"
      7 <<<<<< old
      8 
      9 # No diagnostic since the following line is parsed as a variable assignment,
     10 # even though the variable name is empty.  See also varname-empty.mk.
     11 ====== middle
     12 
     13 # expect+1: Invalid line ">>>>>> new"
     14 >>>>>> new
     15 
     16 
     17 # Since parse.c 1.578 from 2021-12-14 and before parse.c 1.681 from
     18 # 2022-07-24, if a line of a makefile could only be a dependency specification
     19 # but didn't contain any of the dependency operators ':', '!', '::' and its
     20 # expansion ended with a space, make read a single byte from the memory beyond
     21 # the expanded line's terminating '\0'.
     22 #
     23 # https://bugs.freebsd.org/265119
     24 # expect+1: Invalid line "one-target ${:U }", expanded to "one-target  "
     25 one-target ${:U }
     26 
     27 
     28 # Since parse.c 1.656 from 2022-01-27 and before parse.c 1.662 from
     29 # 2022-02-05, there was an out-of-bounds read in Parse_IsVar when looking for
     30 # a variable assignment in a dependency line with trailing whitespace.  Lines
     31 # without trailing whitespace were not affected.  Global variable assignments
     32 # were guaranteed to have no trailing whitespace and were thus not affected.
     33 #
     34 # Try to reproduce some variants that may lead to a crash, depending on the
     35 # memory allocator.  To get a crash, the terminating '\0' of the line must be
     36 # the last byte of a memory page.  The expression '${:U}' forces this trailing
     37 # whitespace.
     38 
     39 # On FreeBSD x86_64, a crash could in some cases be forced using the following
     40 # line, which has length 47, and if the memory for the expanded line starts at
     41 # 0xXXXX_XXd0, the terminating '\0' may end up at 0xXXXX_Xfff:
     42 Try_to_crash_FreeBSD.xxxxxxxxxxxxxxxxxx: 12345 ${:U}
     43 
     44 # The following line has length 4095 after being expanded, so line[4095] ==
     45 # '\0'.  If the line is
     46 # allocated on a page boundary and the following page is not mapped, this line
     47 # leads to a segmentation fault.
     48 ${:U:range=511:@_@1234567@:ts.}: 12345 ${:U}
     49 
     50 # The following line has length 8191, so line[8191] == '\0'.  If the line is
     51 # allocated on a page boundary and the following page is not mapped, this line
     52 # leads to a segmentation fault.
     53 ${:U:range=1023:@_@1234567@:ts.}: 12345 ${:U}
     54 
     55 12345:
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