[uml-devel] [PATCH] uml: Fix possible deadlock in sig_handler_common()
DORMANTno replies
From: Richard Weinberger <richard@nod.at>
Date: 2016-06-12 20:03:26
Also in:
lkml
Subsystem:
the rest, user-mode linux (uml) · Maintainers:
Linus Torvalds, Richard Weinberger, Anton Ivanov, Johannes Berg
We are in atomic context and must not sleep. Sleeping here is possible since malloc() maps to kmalloc() with GFP_KERNEL. Signed-off-by: Richard Weinberger <richard@nod.at> --- arch/um/os-Linux/signal.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 8acaf4e..a86d7cc 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c@@ -15,6 +15,7 @@ #include <kern_util.h> #include <os.h> #include <sysdep/mcontext.h> +#include <um_malloc.h> void (*sig_info[NSIG])(int, struct siginfo *, struct uml_pt_regs *) = { [SIGTRAP] = relay_signal,
@@ -32,7 +33,7 @@ static void sig_handler_common(int sig, struct siginfo *si, mcontext_t *mc) struct uml_pt_regs *r; int save_errno = errno; - r = malloc(sizeof(struct uml_pt_regs)); + r = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC); if (!r) panic("out of memory");
@@ -91,7 +92,7 @@ static void timer_real_alarm_handler(mcontext_t *mc) { struct uml_pt_regs *regs; - regs = malloc(sizeof(struct uml_pt_regs)); + regs = uml_kmalloc(sizeof(struct uml_pt_regs), UM_GFP_ATOMIC); if (!regs) panic("out of memory");
--
2.7.3
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