Cygwin: introduce isabspath_strict macro
isabspath handles a path "X:", without trailing slash or backslash, as absolute path. This breaks some scenarios with relative paths starting with "X:". For instance, fstatat will mishandle a call with valid dirfd and "c:" as path. The reason is that gen_full_path_at() will check for isabspath("C:") which returns true. So the path will be used verbatim in fstatat, rather than being converted to a path "<dirfd-path>/c:". So, introduce isabspath_strict, which returns true for paths starting with "X:" only if the next char is actually a slash or backslash. Use it from gen_full_path_at(). This still fixes only half the problem. The right thing would have been to disallow using DOS paths in the first place. Unfortunately it's much too late for that. Addresses: https://cygwin.com/pipermail/cygwin/2021-November/249837.html Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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@ -4714,7 +4714,7 @@ gen_full_path_at (char *path_ret, int dirfd, const char *pathname,
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return -1;
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}
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}
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if (pathname && isabspath (pathname))
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if (pathname && isabspath_strict (pathname))
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stpcpy (path_ret, pathname);
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else
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{
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@ -139,9 +139,17 @@ extern int cygserver_running;
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#undef issep
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#define issep(ch) (strchr (" \t\n\r", (ch)) != NULL)
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/* Treats "X:" as absolute path.
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FIXME: We should drop the notion that "X:" is a valid absolute path.
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Only "X:/" and "X:\\" should be (see isabspath_strict below). The
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problem is to find out if we have code depending on this behaviour. */
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#define isabspath(p) \
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(isdirsep (*(p)) || (isalpha (*(p)) && (p)[1] == ':' && (!(p)[2] || isdirsep ((p)[2]))))
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/* Treats "X:/" and "X:\\" as absolute paths, but not "X:" */
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#define isabspath_strict(p) \
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(isdirsep (*(p)) || (isalpha (*(p)) && (p)[1] == ':' && isdirsep ((p)[2])))
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/******************** Initialization/Termination **********************/
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class per_process;
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