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authorDavid Howells <dhowells@redhat.com>2008-04-29 00:59:34 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-29 08:06:05 -0700
commite1d2c8b69ad81ea103b1e87809eba51931e16874 (patch)
treebfd78fc4729f5a9911b8e1ca145ad34a17fc3e3b
parent76308da18910e556747f6d100147f42ccc78662c (diff)
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>
-rw-r--r--fs/binfmt_elf_fdpic.c14
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;