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Kernel+LibC+crash: Add mprotect() syscall

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This patch adds the mprotect() syscall to allow changing the protection
flags for memory regions. We don't do any region splitting/merging yet,
so this only works on whole mmap() regions.

Added a "crash -r" flag to verify that we crash when you attempt to
write to read-only memory. :^)
This commit is contained in:
Andreas Kling 2019-08-12 19:33:24 +02:00
parent 4917445e2e
commit 7d6689055f
7 changed files with 36 additions and 1 deletions
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6
Libraries/LibC/mman.cpp
View file

@ -33,6 +33,12 @@ int munmap(void* addr, size_t size)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int mprotect(void* addr, size_t size, int prot)
{
int rc = syscall(SC_mprotect, addr, size, prot);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
int set_mmap_name(void* addr, size_t size, const char* name)
{
int rc = syscall(SC_set_mmap_name, addr, size, name);

1
Libraries/LibC/mman.h
View file

@ -21,6 +21,7 @@ __BEGIN_DECLS
void* mmap(void* addr, size_t, int prot, int flags, int fd, off_t);
void* mmap_with_name(void* addr, size_t, int prot, int flags, int fd, off_t, const char* name);
int munmap(void*, size_t);
int mprotect(void*, size_t, int prot);
int set_mmap_name(void*, size_t, const char*);
int shm_open(const char* name, int flags, mode_t);
int shm_unlink(const char* name);