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Date: Thu, 9 Jul 2009 03:48:20 -0400
From: Geoffrey Thomas <geofft@....EDU>
To: linux-kernel@...r.kernel.org
Cc: Geoffrey Thomas <geofft@....edu>
Subject: [PATCH] Return ENOEXEC, not ENOENT, if a binary's or script's interpreter doesn't exist.
If you try to execute a binary compiled for ld-linux.so.1 (libc5) on a machine
with only ld-linux.so.2 (libc6), your shell will claim "mybinary: No such file
or directory", even though the binary exists. The ENOENT actually applies to
the ELF intepreter, not to the file itself. The same happens if you have a
nonexistent interpreter in a shell script's shebang line.
Give a more helpful and more expected error, "cannot execute binary file", in
these cases.
Signed-off-by: Geoffrey Thomas <geofft@....edu>
Tested-by: Anders Kaseorg <andersk@....edu>
---
fs/binfmt_elf.c | 5 ++++-
fs/binfmt_elf_fdpic.c | 2 ++
fs/binfmt_em86.c | 8 ++++++--
fs/binfmt_misc.c | 5 ++++-
fs/binfmt_script.c | 8 ++++++--
5 files changed, 22 insertions(+), 6 deletions(-)
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index b7c1603..56954e4 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -685,8 +685,11 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
interpreter = open_exec(elf_interpreter);
retval = PTR_ERR(interpreter);
- if (IS_ERR(interpreter))
+ if (IS_ERR(interpreter)) {
+ if (retval == -ENOENT)
+ retval = -ENOEXEC;
goto out_free_interp;
+ }
/*
* If the binary is not readable then enforce
diff --git a/fs/binfmt_elf_fdpic.c b/fs/binfmt_elf_fdpic.c
index 20fbece..604d117 100644
--- a/fs/binfmt_elf_fdpic.c
+++ b/fs/binfmt_elf_fdpic.c
@@ -232,6 +232,8 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
interpreter = open_exec(interpreter_name);
retval = PTR_ERR(interpreter);
if (IS_ERR(interpreter)) {
+ if (retval == -ENOENT)
+ retval = -ENOEXEC;
interpreter = NULL;
goto error;
}
diff --git a/fs/binfmt_em86.c b/fs/binfmt_em86.c
index 32fb00b..587e0b9 100644
--- a/fs/binfmt_em86.c
+++ b/fs/binfmt_em86.c
@@ -82,8 +82,12 @@ static int load_em86(struct linux_binprm *bprm,struct pt_regs *regs)
* space, and we don't need to copy it.
*/
file = open_exec(interp);
- if (IS_ERR(file))
- return PTR_ERR(file);
+ if (IS_ERR(file)) {
+ if (PTR_ERR(file) == -ENOENT)
+ return -ENOEXEC;
+ else
+ return PTR_ERR(file);
+ }
bprm->file = file;
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index c4e8353..eecf0db 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -180,8 +180,11 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs)
interp_file = open_exec (iname);
retval = PTR_ERR (interp_file);
- if (IS_ERR (interp_file))
+ if (IS_ERR (interp_file)) {
+ if (retval == -ENOENT)
+ retval = -ENOEXEC;
goto _error;
+ }
bprm->file = interp_file;
if (fmt->flags & MISC_FMT_CREDENTIALS) {
diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c
index 0834350..738446f 100644
--- a/fs/binfmt_script.c
+++ b/fs/binfmt_script.c
@@ -88,8 +88,12 @@ static int load_script(struct linux_binprm *bprm,struct pt_regs *regs)
* OK, now restart the process with the interpreter's dentry.
*/
file = open_exec(interp);
- if (IS_ERR(file))
- return PTR_ERR(file);
+ if (IS_ERR(file)) {
+ if (PTR_ERR(file) == -ENOENT)
+ return -ENOEXEC;
+ else
+ return PTR_ERR(file);
+ }
bprm->file = file;
retval = prepare_binprm(bprm);
--
1.5.6.5
--
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