diff options
| author | David Howells <dhowells@redhat.com> | 2008-04-29 00:59:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:05 -0700 |
| commit | e1d2c8b69ad81ea103b1e87809eba51931e16874 (patch) | |
| tree | bfd78fc4729f5a9911b8e1ca145ad34a17fc3e3b /fs/binfmt_elf_fdpic.c | |
| parent | 76308da18910e556747f6d100147f42ccc78662c (diff) | |
| download | lwn-e1d2c8b69ad81ea103b1e87809eba51931e16874.tar.gz lwn-e1d2c8b69ad81ea103b1e87809eba51931e16874.zip | |
fdpic: check that the size returned by kernel_read() is what we asked for
Check that the size of the read returned by kernel_read() is what we asked
for. If it isn't, then reject the binary as being a badly formatted.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_elf_fdpic.c')
| -rw-r--r-- | fs/binfmt_elf_fdpic.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c index 32649f2a1654..ddd35d873391 100644 --- a/fs/binfmt_elf_fdpic.c +++ b/fs/binfmt_elf_fdpic.c @@ -136,8 +136,8 @@ static int elf_fdpic_fetch_phdrs(struct elf_fdpic_params *params, retval = kernel_read(file, params->hdr.e_phoff, (char *) params->phdrs, size); - if (retval < 0) - return retval; + if (unlikely(retval != size)) + return retval < 0 ? retval : -ENOEXEC; /* determine stack size for this binary */ phdr = params->phdrs; @@ -218,8 +218,11 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, phdr->p_offset, interpreter_name, phdr->p_filesz); - if (retval < 0) + if (unlikely(retval != phdr->p_filesz)) { + if (retval >= 0) + retval = -ENOEXEC; goto error; + } retval = -ENOENT; if (interpreter_name[phdr->p_filesz - 1] != '\0') @@ -245,8 +248,11 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm, retval = kernel_read(interpreter, 0, bprm->buf, BINPRM_BUF_SIZE); - if (retval < 0) + if (unlikely(retval != BINPRM_BUF_SIZE)) { + if (retval >= 0) + retval = -ENOEXEC; goto error; + } interp_params.hdr = *((struct elfhdr *) bprm->buf); break; |