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| author | gjb <gjb@FreeBSD.org> | 2016-02-02 22:27:48 +0000 |
|---|---|---|
| committer | gjb <gjb@FreeBSD.org> | 2016-02-02 22:27:48 +0000 |
| commit | efd5551e55b056811a107b33e1c30676ee37d0e8 (patch) | |
| tree | 5ea64f05cc16d8a5032524fdefec823e707e1ff3 /libexec/rtld-elf | |
| parent | a6998ad84f9722c560a80302a74fa495e818a153 (diff) | |
| parent | 6d511d769313fd1dae574a1d395369df219e86b6 (diff) | |
| download | FreeBSD-src-efd5551e55b056811a107b33e1c30676ee37d0e8.zip FreeBSD-src-efd5551e55b056811a107b33e1c30676ee37d0e8.tar.gz | |
MFH
Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'libexec/rtld-elf')
| -rw-r--r-- | libexec/rtld-elf/map_object.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/libexec/rtld-elf/map_object.c b/libexec/rtld-elf/map_object.c index 6012015..f4f6f42 100644 --- a/libexec/rtld-elf/map_object.c +++ b/libexec/rtld-elf/map_object.c @@ -38,7 +38,7 @@ #include "debug.h" #include "rtld.h" -static Elf_Ehdr *get_elf_header(int, const char *); +static Elf_Ehdr *get_elf_header(int, const char *, const struct stat *); static int convert_prot(int); /* Elf flags -> mmap protection */ static int convert_flags(int); /* Elf flags -> mmap flags */ @@ -91,7 +91,7 @@ map_object(int fd, const char *path, const struct stat *sb) char *note_map; size_t note_map_len; - hdr = get_elf_header(fd, path); + hdr = get_elf_header(fd, path, sb); if (hdr == NULL) return (NULL); @@ -324,10 +324,16 @@ error: } static Elf_Ehdr * -get_elf_header(int fd, const char *path) +get_elf_header(int fd, const char *path, const struct stat *sbp) { Elf_Ehdr *hdr; + /* Make sure file has enough data for the ELF header */ + if (sbp != NULL && sbp->st_size < sizeof(Elf_Ehdr)) { + _rtld_error("%s: invalid file format", path); + return (NULL); + } + hdr = mmap(NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE | MAP_PREFAULT_READ, fd, 0); if (hdr == (Elf_Ehdr *)MAP_FAILED) { |
