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i386: do not allow userspace to set tf_trapno on sigreturn(2)

Description

i386: do not allow userspace to set tf_trapno on sigreturn(2)

PR: 265889

(cherry picked from commit dc4a2d1d0e838579f21d9d1fef8655f902f06ab2)

Details

Provenance
kibAuthored on Aug 19 2022, 1:26 AM
Parents
rG3416c2f3c5cf: irettraps: i386 does not push %ss/%esp when exception does not switch rings
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