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author | brueffer <brueffer@FreeBSD.org> | 2014-11-24 09:31:38 +0000 |
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committer | brueffer <brueffer@FreeBSD.org> | 2014-11-24 09:31:38 +0000 |
commit | 678318cd20f7db4e6c6b85d83fe00fa327b04fca (patch) | |
tree | 76d56cf97d5aafbea3a89433cb38fcc34c979bda /usr.bin/elfdump | |
parent | bf894082e1802228e27171488ac061384ca6863a (diff) | |
download | FreeBSD-src-678318cd20f7db4e6c6b85d83fe00fa327b04fca.zip FreeBSD-src-678318cd20f7db4e6c6b85d83fe00fa327b04fca.tar.gz |
Limit descriptors and enter capability mode.
Differential: D1009
Reviewed by: jonathan, pjd
MFC after: 2 weeks
Relnotes: yes
Diffstat (limited to 'usr.bin/elfdump')
-rw-r--r-- | usr.bin/elfdump/elfdump.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/usr.bin/elfdump/elfdump.c b/usr.bin/elfdump/elfdump.c index bf9b718..d58587e 100644 --- a/usr.bin/elfdump/elfdump.c +++ b/usr.bin/elfdump/elfdump.c @@ -29,12 +29,15 @@ __FBSDID("$FreeBSD$"); #include <sys/types.h> + +#include <sys/capsicum.h> #include <sys/elf32.h> #include <sys/elf64.h> #include <sys/endian.h> #include <sys/mman.h> #include <sys/stat.h> #include <err.h> +#include <errno.h> #include <fcntl.h> #include <inttypes.h> #include <stddef.h> @@ -467,6 +470,7 @@ elf_get_shstrndx(Elf32_Ehdr *e, void *sh) int main(int ac, char **av) { + cap_rights_t rights; u_int64_t phoff; u_int64_t shoff; u_int64_t phentsize; @@ -527,6 +531,9 @@ main(int ac, char **av) case 'w': if ((out = fopen(optarg, "w")) == NULL) err(1, "%s", optarg); + cap_rights_init(&rights, CAP_FSTAT, CAP_WRITE); + if (cap_rights_limit(fileno(out), &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for %s", optarg); break; case '?': default: @@ -539,6 +546,17 @@ main(int ac, char **av) if ((fd = open(*av, O_RDONLY)) < 0 || fstat(fd, &sb) < 0) err(1, "%s", *av); + cap_rights_init(&rights, CAP_MMAP_R); + if (cap_rights_limit(fd, &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for %s", *av); + close(STDIN_FILENO); + cap_rights_init(&rights, CAP_WRITE); + if (cap_rights_limit(STDOUT_FILENO, &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for stdout"); + if (cap_rights_limit(STDERR_FILENO, &rights) < 0 && errno != ENOSYS) + err(1, "unable to limit rights for stderr"); + if (cap_enter() < 0 && errno != ENOSYS) + err(1, "unable to enter capability mode"); e = mmap(NULL, sb.st_size, PROT_READ, MAP_SHARED, fd, 0); if (e == MAP_FAILED) err(1, NULL); |