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From: Szabolcs Nagy <nsz@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/arm/morello/main] TODO(uapi): mmap perm emulation Date: Wed, 26 Oct 2022 14:48:58 +0000 (GMT) [thread overview] Message-ID: <20221026144859.E53663854811@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dac0b184e7affbcdb11c3bfaef7d03bf3b0bfe28 commit dac0b184e7affbcdb11c3bfaef7d03bf3b0bfe28 Author: Szabolcs Nagy <szabolcs.nagy@arm.com> Date: Mon Oct 24 15:29:58 2022 +0100 TODO(uapi): mmap perm emulation Diff: --- sysdeps/unix/sysv/linux/mmap64.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/sysdeps/unix/sysv/linux/mmap64.c b/sysdeps/unix/sysv/linux/mmap64.c index 60da02939d..a7bd396880 100644 --- a/sysdeps/unix/sysv/linux/mmap64.c +++ b/sysdeps/unix/sysv/linux/mmap64.c @@ -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;
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