Messages in this thread Patch in this message | | | From | Richard Weinberger <> | Subject | [PATCH] Fix infinite loop in search_binary_handler() | Date | Fri, 17 Jun 2011 00:11:20 +0200 |
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When search_binary_handler() is called to find a handler for /sbin/modprobe it will end up in an infinite loop because it executes request_module() to load a binfmt module with /sbin/modprobe...
Running a x86_64 kernel without ia32 emulation and a x86 user land triggers this issue.
Signed-off-by: Richard Weinberger <richard@nod.at> --- fs/exec.c | 5 ++++- 1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c index 97e0d52..7271b22 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1411,7 +1411,10 @@ int search_binary_handler(struct linux_binprm *bprm,struct pt_regs *regs) printable(bprm->buf[2]) && printable(bprm->buf[3])) break; /* -ENOEXEC */ - request_module("binfmt-%04x", *(unsigned short *)(&bprm->buf[2])); + + /* Avoid an infinite loop */ + if (strcmp(modprobe_path, bprm->filename)) + request_module("binfmt-%04x", *(unsigned short *)(&bprm->buf[2])); #endif } } -- 1.7.5.4
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