mirror of
https://github.com/freebsd/freebsd-src
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945078deae
Relevant/interesting changes:
o parse.c: don't print null filename in stack traces
o for.c: skip syntactically wrong .for loops
o var.c: allow for :gmtime=${mtime}
add :mtime[=timestamp] where timestamp is used if stat(2)
fails, if :mtime=error stat(2) failure causes error.
o make.1: fix documentation of .PREFIX to match reality and POSIX
o unit-tests: improved var-scope-local
55 lines
2.2 KiB
Makefile
55 lines
2.2 KiB
Makefile
# $NetBSD: parse.mk,v 1.4 2023/04/28 13:09:48 rillig Exp $
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#
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# Test those parts of the parsing that do not belong in any of the other
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# categories.
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# expect+1: Makefile appears to contain unresolved CVS/RCS/??? merge conflicts
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<<<<<< old
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# No diagnostic since the following line is parsed as a variable assignment,
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# even though the variable name is empty. See also varname-empty.mk.
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====== middle
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# expect+1: Makefile appears to contain unresolved CVS/RCS/??? merge conflicts
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>>>>>> new
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# Since parse.c 1.578 from 2021-12-14 and before parse.c 1.681 from
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# 2022-07-24, if a line of a makefile could only be a dependency specification
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# but didn't contain any of the dependency operators ':', '!', '::' and its
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# expansion ended with a space, make read a single byte from the memory beyond
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# the expanded line's terminating '\0'.
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#
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# https://bugs.freebsd.org/265119
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one-target ${:U }
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# Since parse.c 1.656 from 2022-01-27 and before parse.c 1.662 from
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# 2022-02-05, there was an out-of-bounds read in Parse_IsVar when looking for
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# a variable assignment in a dependency line with trailing whitespace. Lines
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# without trailing whitespace were not affected. Global variable assignments
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# were guaranteed to have no trailing whitespace and were thus not affected.
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#
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# Try to reproduce some variants that may lead to a crash, depending on the
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# memory allocator. To get a crash, the terminating '\0' of the line must be
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# the last byte of a memory page. The expression '${:U}' forces this trailing
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# whitespace.
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# On FreeBSD x86_64, a crash could in some cases be forced using the following
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# line, which has length 47, and if the memory for the expanded line starts at
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# 0xXXXX_XXd0, the terminating '\0' may end up at 0xXXXX_Xfff:
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Try_to_crash_FreeBSD.xxxxxxxxxxxxxxxxxx: 12345 ${:U}
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# The following line has length 4095 after being expanded, so line[4095] ==
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# '\0'. If the line is
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# allocated on a page boundary and the following page is not mapped, this line
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# leads to a segmentation fault.
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${:U:range=511:@_@1234567@:ts.}: 12345 ${:U}
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# The following line has length 8191, so line[8191] == '\0'. If the line is
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# allocated on a page boundary and the following page is not mapped, this line
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# leads to a segmentation fault.
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${:U:range=1023:@_@1234567@:ts.}: 12345 ${:U}
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12345:
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