[RFC v17][PATCH 12/60] pids 2/7: Have alloc_pidmap() return actual error code
From: Oren Laadan <hidden>
Date: 2009-07-22 10:13:38
Also in:
linux-mm, lkml
Subsystem:
exec & binfmt api, elf, memory management - core, scheduler, the rest · Maintainers:
Kees Cook, Andrew Morton, David Hildenbrand, Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
From: Sukadev Bhattiprolu <redacted> alloc_pidmap() can fail either because all pid numbers are in use or because memory allocation failed. With support for setting a specific pid number, alloc_pidmap() would also fail if either the given pid number is invalid or in use. Rather than have callers assume -ENOMEM, have alloc_pidmap() return the actual error. Signed-off-by: Sukadev Bhattiprolu <redacted> Acked-by: Serge Hallyn <redacted> Reviewed-by: Oren Laadan <redacted> --- kernel/fork.c | 5 +++-- kernel/pid.c | 9 ++++++--- 2 files changed, 9 insertions(+), 5 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index bd29592..e90cee5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c@@ -1123,10 +1123,11 @@ static struct task_struct *copy_process(unsigned long clone_flags, goto bad_fork_cleanup_io; if (pid != &init_struct_pid) { - retval = -ENOMEM; pid = alloc_pid(p->nsproxy->pid_ns); - if (!pid) + if (IS_ERR(pid)) { + retval = PTR_ERR(pid); goto bad_fork_cleanup_io; + } if (clone_flags & CLONE_NEWPID) { retval = pid_ns_prepare_proc(p->nsproxy->pid_ns);
diff --git a/kernel/pid.c b/kernel/pid.c
index f618096..9c678ce 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c@@ -158,6 +158,7 @@ static int alloc_pidmap(struct pid_namespace *pid_ns) offset = pid & BITS_PER_PAGE_MASK; map = &pid_ns->pidmap[pid/BITS_PER_PAGE]; max_scan = (pid_max + BITS_PER_PAGE - 1)/BITS_PER_PAGE - !offset; + rc = -EAGAIN; for (i = 0; i <= max_scan; ++i) { rc = alloc_pidmap_page(map); if (rc)
@@ -188,12 +189,14 @@ static int alloc_pidmap(struct pid_namespace *pid_ns) } else { map = &pid_ns->pidmap[0]; offset = RESERVED_PIDS; - if (unlikely(last == offset)) + if (unlikely(last == offset)) { + rc = -EAGAIN; break; + } } pid = mk_pid(pid_ns, map, offset); } - return -1; + return rc; } int next_pidmap(struct pid_namespace *pid_ns, int last)
@@ -298,7 +301,7 @@ out_free: free_pidmap(pid->numbers + i); kmem_cache_free(ns->pid_cachep, pid); - pid = NULL; + pid = ERR_PTR(nr); goto out; }
--
1.6.0.4
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