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um: Use POSIX ucontext_t instead of struct ucontext

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commit 4d1a535b8ec5e74b42dfd9dc809142653b2597f6 upstream.

glibc 2.26 removed the 'struct ucontext' to "improve" POSIX compliance
and break programs, including User Mode Linux. Fix User Mode Linux
by using POSIX ucontext_t.

This fixes:

arch/um/os-Linux/signal.c: In function 'hard_handler':
arch/um/os-Linux/signal.c:163:22: error: dereferencing pointer to incomplete type 'struct ucontext'
  mcontext_t *mc = &uc->uc_mcontext;
arch/x86/um/stub_segv.c: In function 'stub_segv_handler':
arch/x86/um/stub_segv.c:16:13: error: dereferencing pointer to incomplete type 'struct ucontext'
          &uc->uc_mcontext);

Cc: stable@vger.kernel.org
Signed-off-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Krzysztof Mazur 2017-11-15 11:12:39 +01:00 committed by Greg Kroah-Hartman
parent 5c90515d52
commit 4cc90ae05e
2 changed files with 2 additions and 2 deletions
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2
arch/um/os-Linux/signal.c
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@ -140,7 +140,7 @@ static void (*handlers[_NSIG])(int sig, struct siginfo *si, mcontext_t *mc) = {
static void hard_handler(int sig, siginfo_t *si, void *p)
{
struct ucontext *uc = p;
ucontext_t *uc = p;
mcontext_t *mc = &uc->uc_mcontext;
unsigned long pending = 1UL << sig;

2
arch/x86/um/stub_segv.c
View File

@ -10,7 +10,7 @@
void __attribute__ ((__section__ (".__syscall_stub")))
stub_segv_handler(int sig, siginfo_t *info, void *p)
{
struct ucontext *uc = p;
ucontext_t *uc = p;
GET_FAULTINFO_FROM_MC(*((struct faultinfo *) STUB_DATA),
&uc->uc_mcontext);