The patch titled
uml: Fix handling of failed execs of helpers
has been added to the -mm tree. Its filename is
uml-fix-handling-of-failed-execs-of-helpers.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: uml: Fix handling of failed execs of helpers
From: Jeff Dike <jdike@xxxxxxxxxxx>
There were some bugs in handling failures to exec helper programs. errno was
passed back from the child with the wrong sign. It was also ignored. In the
case where it mattered, the errno from the (successful) read in the parent was
used instead.
Signed-off-by: Jeff Dike <jdike@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
arch/um/os-Linux/helper.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff -puN arch/um/os-Linux/helper.c~uml-fix-handling-of-failed-execs-of-helpers arch/um/os-Linux/helper.c
--- a/arch/um/os-Linux/helper.c~uml-fix-handling-of-failed-execs-of-helpers
+++ a/arch/um/os-Linux/helper.c
@@ -42,7 +42,7 @@ static int helper_child(void *arg)
if(data->pre_exec != NULL)
(*data->pre_exec)(data->pre_data);
execvp(argv[0], argv);
- errval = errno;
+ errval = -errno;
printk("helper_child - execve of '%s' failed - errno = %d\n", argv[0], errno);
os_write_file(data->fd, &errval, sizeof(errval));
kill(os_getpid(), SIGKILL);
@@ -62,7 +62,7 @@ int run_helper(void (*pre_exec)(void *),
stack = *stack_out;
else stack = alloc_stack(0, __cant_sleep());
if(stack == 0)
- return(-ENOMEM);
+ return -ENOMEM;
ret = os_pipe(fds, 1, 0);
if(ret < 0){
@@ -95,16 +95,16 @@ int run_helper(void (*pre_exec)(void *),
/* Read the errno value from the child, if the exec failed, or get 0 if
* the exec succeeded because the pipe fd was set as close-on-exec. */
n = os_read_file(fds[0], &ret, sizeof(ret));
- if (n < 0) {
- printk("run_helper : read on pipe failed, ret = %d\n", -n);
- ret = n;
- kill(pid, SIGKILL);
- CATCH_EINTR(waitpid(pid, NULL, 0));
- } else if(n != 0){
- CATCH_EINTR(n = waitpid(pid, NULL, 0));
- ret = -errno;
- } else {
+ if(n == 0)
ret = pid;
+ else {
+ if(n < 0){
+ printk("run_helper : read on pipe failed, ret = %d\n",
+ -n);
+ ret = n;
+ kill(pid, SIGKILL);
+ }
+ CATCH_EINTR(waitpid(pid, NULL, 0));
}
out_close:
_
Patches currently in -mm which might be from jdike@xxxxxxxxxxx are
reduce-max_nr_zones-make-zone_highmem-optional-fix-fix-fix.patch
fix-x86_64-mm-i386-semaphore-to-asm-uml-fix.patch
uml-use-klibc-setjmp-longjmp.patch
uml-use-array_size-more-assiduously.patch
uml-fix-stack-alignment.patch
uml-whitespace-fixes.patch
uml-fix-handling-of-failed-execs-of-helpers.patch
uml-improve-sigbus-diagnostics.patch
uml-remove-pte_mkexec.patch
vdso-hash-style-fix.patch
vdso-hash-style-fix-fix.patch
namespaces-utsname-switch-to-using-uts-namespaces-uml-fix.patch
-
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