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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-08-05 11:44:57 +0100 |
|---|---|---|
| committer | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2022-10-27 14:46:51 +0100 |
| commit | 1635be334baa886f7576b078c05e529742828ca8 (patch) | |
| tree | 439a4370ed93935a412ab016135413629c6eac0f /sysdeps/unix/sysv/linux/mremap.c | |
| parent | ab15a586a0d679878bc3034bc1db5540cda63911 (diff) | |
| download | glibc-1635be334baa886f7576b078c05e529742828ca8.tar glibc-1635be334baa886f7576b078c05e529742828ca8.tar.gz glibc-1635be334baa886f7576b078c05e529742828ca8.tar.bz2 glibc-1635be334baa886f7576b078c05e529742828ca8.zip | |
TODO(uapi): narrow capability in mmap and mremap
This is a temporary workaround.
length is rounded up to pagesize and don't use exact bound (bounds
will be larger if exact value is not representable).
capability permissions are roughly emulated too.
TODO: kernel should do this
Diffstat (limited to 'sysdeps/unix/sysv/linux/mremap.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/mremap.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sysdeps/unix/sysv/linux/mremap.c b/sysdeps/unix/sysv/linux/mremap.c index e829a29dbd..2e89f43faa 100644 --- a/sysdeps/unix/sysv/linux/mremap.c +++ b/sysdeps/unix/sysv/linux/mremap.c @@ -20,6 +20,7 @@ #include <sysdep.h> #include <stdarg.h> #include <stddef.h> +#include <ldsodefs.h> void * __mremap (void *addr, size_t old_len, size_t new_len, int flags, ...) @@ -34,8 +35,17 @@ __mremap (void *addr, size_t old_len, size_t new_len, int flags, ...) va_end (va); } - return (void *) INLINE_SYSCALL_CALL (mremap, addr, old_len, new_len, flags, + void *ret; + ret = (void *) INLINE_SYSCALL_CALL (mremap, addr, old_len, new_len, flags, new_addr); +#ifdef __CHERI_PURE_CAPABILITY__ + if (ret != MAP_FAILED) + { + size_t ps = GLRO(dl_pagesize); + ret = __builtin_cheri_bounds_set (ret, (new_len + ps - 1) & -ps); + } +#endif + return ret; } libc_hidden_def (__mremap) weak_alias (__mremap, mremap) |