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commit d93769405996dfc11d216ddbe415946617b5a494
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Author: Andreas Schwab <schwab@suse.de>
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Date: Mon Jan 20 17:01:50 2020 +0100
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Fix array overflow in backtrace on PowerPC (bug 25423)
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When unwinding through a signal frame the backtrace function on PowerPC
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didn't check array bounds when storing the frame address. Fixes commit
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d400dcac5e ("PowerPC: fix backtrace to handle signal trampolines").
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diff --git a/debug/tst-backtrace5.c b/debug/tst-backtrace5.c
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index e7ce410845..b2f46160e7 100644
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--- a/debug/tst-backtrace5.c
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+++ b/debug/tst-backtrace5.c
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@@ -89,6 +89,18 @@ handle_signal (int signum)
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}
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/* Symbol names are not available for static functions, so we do not
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check do_test. */
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+
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+ /* Check that backtrace does not return more than what fits in the array
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+ (bug 25423). */
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+ for (int j = 0; j < NUM_FUNCTIONS; j++)
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+ {
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+ n = backtrace (addresses, j);
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+ if (n > j)
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+ {
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+ FAIL ();
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+ return;
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+ }
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+ }
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}
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NO_INLINE int
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diff --git a/sysdeps/powerpc/powerpc32/backtrace.c b/sysdeps/powerpc/powerpc32/backtrace.c
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index 7c2d4726f8..d1456c8ae4 100644
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--- a/sysdeps/powerpc/powerpc32/backtrace.c
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+++ b/sysdeps/powerpc/powerpc32/backtrace.c
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@@ -114,6 +114,8 @@ __backtrace (void **array, int size)
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}
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if (gregset)
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{
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+ if (count + 1 == size)
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+ break;
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array[++count] = (void*)((*gregset)[PT_NIP]);
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current = (void*)((*gregset)[PT_R1]);
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}
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diff --git a/sysdeps/powerpc/powerpc64/backtrace.c b/sysdeps/powerpc/powerpc64/backtrace.c
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index 65c260ab76..8a53a1088f 100644
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--- a/sysdeps/powerpc/powerpc64/backtrace.c
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+++ b/sysdeps/powerpc/powerpc64/backtrace.c
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@@ -87,6 +87,8 @@ __backtrace (void **array, int size)
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if (is_sigtramp_address (current->return_address))
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{
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struct signal_frame_64 *sigframe = (struct signal_frame_64*) current;
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+ if (count + 1 == size)
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+ break;
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array[++count] = (void*) sigframe->uc.uc_mcontext.gp_regs[PT_NIP];
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current = (void*) sigframe->uc.uc_mcontext.gp_regs[PT_R1];
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}
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