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FnCallFormat() hands each format piece straight to snprintf() or
BufferAppendF() with exactly one argument. The modifier denylist
("hLqjzt") lets through '*', which takes a width or precision from the
argument list, and '$', which selects a positional argument, so
format("%*d", 7) prints whatever is in the next vararg slot and
format("%2$s", "a") or format("%*s", "a") dereference a slot that was
never passed as a char *. 'l' on %s/%S makes printf read the char *
argument as a wchar_t *, 4 bytes per character past the end of the
string.
The format argument is expanded before the function runs, so a
variable interpolated into it (file contents, module output, data
container values) can carry such a specifier.
Changelog: Title
Signed-off-by: Dhanraj E <dhanraj@labs.digiscrypt.com>
(cherry picked from commit 53ae7d3)
Signed-off-by: Lars Erik Wik <lars.erik.wik@northern.tech>
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Backport of #6419.
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