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[PW_SID:1097107] [v4] riscv: cif: reduce shadow stack size limit from 4GB to 2GB #1971

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[PW_SID:1097107] [v4] riscv: cif: reduce shadow stack size limit from 4GB to 2GB #1971

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6 changes: 3 additions & 3 deletions arch/riscv/kernel/usercfi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -109,15 +109,15 @@ void set_indir_lp_lock(struct task_struct *task, bool lock)
task->thread_info.user_cfi_state.ufcfi_locked = lock;
}
/*
* If size is 0, then to be compatible with regular stack we want it to be as big as
* regular stack. Else PAGE_ALIGN it and return back
* The shadow stack only stores the return address and not any variables
* 512M should be more than sufficient for most applications.
*/
static unsigned long calc_shstk_size(unsigned long size)
{
if (size)
return PAGE_ALIGN(size);

return PAGE_ALIGN(min_t(unsigned long long, rlimit(RLIMIT_STACK), SZ_4G));
return PAGE_ALIGN(min(rlimit(RLIMIT_STACK) / 8, SZ_512M));
}

/*
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