Python: Model shell -c command arguments - #22434
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Fixes #21735.
Models command arguments passed with
-cto recognized POSIX shell interpreters throughos.exec*,os.spawn*,os.posix_spawn*, and argument-vectorsubprocessAPIs.This detects tainted shell commands while leaving ordinary argument vectors unchanged. The modeling is limited to literal shell executables, an exact
-cflag, and literal argument sequences.