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authorAnton Ivanov <anton.ivanov@cambridgegreys.com>2020-11-10 13:02:21 +0000
committerRichard Weinberger <richard@nod.at>2020-12-13 22:38:06 +0100
commit3c6ac61bc91ea39031f020c973a91db0aee10fde (patch)
tree058ffd80b8e3438afafaa6c3351a72b3f6a8fc9c /arch/um
parenta374b7cb1ea648a27ceaa2dea19aa967725e938b (diff)
downloadlinux-3c6ac61bc91ea39031f020c973a91db0aee10fde.tar.bz2
um: Fetch registers only for signals which need them
UML userspace fetches siginfo and passes it to signal handlers in UML. This is needed only for some of the signals, because key handlers like SIGIO make no use of this variable. Signed-off-by: Anton Ivanov <anton.ivanov@cambridgegreys.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um')
-rw-r--r--arch/um/os-Linux/skas/process.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 4fb877b99dde..0621d521208e 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -400,7 +400,20 @@ void userspace(struct uml_pt_regs *regs, unsigned long *aux_fp_regs)
if (WIFSTOPPED(status)) {
int sig = WSTOPSIG(status);
- ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
+ /* These signal handlers need the si argument.
+ * The SIGIO and SIGALARM handlers which constitute the
+ * majority of invocations, do not use it.
+ */
+ switch (sig) {
+ case SIGSEGV:
+ case SIGTRAP:
+ case SIGILL:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGWINCH:
+ ptrace(PTRACE_GETSIGINFO, pid, 0, (struct siginfo *)&si);
+ break;
+ }
switch (sig) {
case SIGSEGV: