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Matheus
42 lines
924 B
C
42 lines
924 B
C
#include <kernel/syscalls.h>
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#include <kernel/abi.h>
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#include <errno.h>
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#include <kernel/vmm.h>
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#include <logging.h>
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#define PROT_READ 0x01
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#define PROT_WRITE 0x02
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#define PROT_EXEC 0x04
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#define KNOWN_PROT (PROT_READ | PROT_WRITE | PROT_EXEC)
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syscallret_t syscall_mprotect(context_t *context, void *address, size_t len, int prot) {
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syscallret_t ret = {
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.errno = 0,
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.ret = -1
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};
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__assert((~KNOWN_PROT & prot) == 0);
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// check alignment
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if (len == 0 || (uintptr_t)address % PAGE_SIZE || address > USERSPACE_END) {
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ret.errno = EINVAL;
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return ret;
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}
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mmuflags_t mmuflags = ARCH_MMU_FLAGS_USER;
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if (prot & PROT_READ)
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mmuflags |= ARCH_MMU_FLAGS_READ;
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if (prot & PROT_WRITE)
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mmuflags |= ARCH_MMU_FLAGS_WRITE;
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if ((prot & PROT_EXEC) == 0)
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mmuflags |= ARCH_MMU_FLAGS_NOEXEC;
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ret.errno = vmm_changemmuflags(address, len, mmuflags, VMM_FLAGS_CREDCHECK);
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ret.ret = ret.errno ? -1 : 0;
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return ret;
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}
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