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Fix missing TLB-flush in mprotect().

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This commit is contained in:
Jonas 'Sortie' Termansen 2014-06-15 14:35:13 +02:00
parent 4ea6aa710c
commit 2d46c1e63c
1 changed files with 5 additions and 1 deletions
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6
kernel/memorymanagement.cpp
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@ -205,9 +205,11 @@ bool ProtectMemory(Process* process, uintptr_t addr, size_t size, int prot)
// TODO: There is a moment of inconsistency here when the segment
// table itself has another protection written than what
// what applies to the actual pages.
// TODO: SECURTIY: Does this have security implications?
segment->prot = prot;
for ( size_t i = 0; i < segment->size; i += Page::Size() )
Memory::PageProtect(segment->addr + i, prot);
Memory::Flush();
}
offset += segment->size;
@ -245,6 +247,7 @@ bool MapMemory(Process* process, uintptr_t addr, size_t size, int prot)
// space exists and we can safely zero it here.
// TODO: Another thread is able to see the old contents of the memory before
// we zero it causing potential information leaks.
// TODO: SECURITY: Information leak.
memset((void*) new_segment.addr, 0, new_segment.size);
return true;
@ -328,7 +331,8 @@ void* sys_mmap(void* addr_ptr, size_t size, int prot, int flags, int fd,
// Determine where to put the new segment and its protection.
struct segment new_segment;
if ( flags & MAP_FIXED )
new_segment.addr = aligned_addr, new_segment.size = aligned_size;
new_segment.addr = aligned_addr,
new_segment.size = aligned_size;
else if ( !PlaceSegment(&new_segment, process, (void*) addr, aligned_size, flags) )
return errno = ENOMEM, MAP_FAILED;
new_segment.prot = prot | PROT_KREAD | PROT_KWRITE | PROT_FORK;