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TODO(uapi): mmap perm emulation

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This commit is contained in:
Szabolcs Nagy 2022-10-24 15:29:58 +01:00
parent 28f19db3b8
commit dac0b184e7
1 changed files with 17 additions and 0 deletions
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17
sysdeps/unix/sysv/linux/mmap64.c
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@ -22,6 +22,9 @@
#include <sysdep.h>
#include <ldsodefs.h>
#include <mmap_internal.h>
#ifdef __CHERI_PURE_CAPABILITY__
# include <cheri_perms.h>
#endif
#ifdef __NR_mmap2
/* To avoid silent truncation of offset when using mmap2, do not accept
@ -64,6 +67,20 @@ __mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
{
size_t ps = GLRO(dl_pagesize);
ret = __builtin_cheri_bounds_set (ret, (len + ps - 1) & -ps);
unsigned long mask = CAP_PERM_MASK_BASE;
if (prot & PROT_READ)
mask |= CAP_PERM_MASK_R;
if (prot & PROT_WRITE)
mask |= CAP_PERM_MASK_RW;
if (prot & PROT_EXEC)
mask |= CAP_PERM_MASK_RX;
if (prot & PROT_MAX (PROT_READ))
mask |= CAP_PERM_MASK_R;
if (prot & PROT_MAX (PROT_WRITE))
mask |= CAP_PERM_MASK_RW;
if (prot & PROT_MAX (PROT_EXEC))
mask |= CAP_PERM_MASK_RX;
ret = __builtin_cheri_perms_and (ret, mask);
}
#endif
return ret;