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Fix for the x86_64 "bt" command in Linux 4.16 and later kernels

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containing commit 3aa99fc3e708b9cd9b4cfe2df0b7a66cf293e3cf, titled
"x86/entry/64: Remove 'interrupt' macro".  Without the patch, the
exception frame display generated by an interrupt exception will
show incorrect contents, and be followed by the message "bt: WARNING:
possibly bogus exception frame".
(anderson@redhat.com)
This commit is contained in:
Dave Anderson 2018-06-20 16:33:43 -04:00
parent e5df29d54b
commit a7e5b90757
1 changed files with 9 additions and 0 deletions
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9
x86_64.c
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@ -4285,6 +4285,12 @@ x86_64_exception_frame(ulong flags, ulong kvaddr, char *local,
long err;
char buf[BUFSIZE];
if (flags == EFRAME_VERIFY) {
if (!accessible(kvaddr) ||
!accessible(kvaddr + SIZE(pt_regs) - sizeof(long)))
return FALSE;
}
ms = machdep->machspec;
sp = NULL;
@ -6283,6 +6289,9 @@ x86_64_irq_eframe_link(ulong stkref, struct bt_info *bt, FILE *ofp)
{
ulong irq_eframe;
if (x86_64_exception_frame(EFRAME_VERIFY, stkref, 0, bt, ofp))
return stkref;
irq_eframe = stkref - machdep->machspec->irq_eframe_link;
if (x86_64_exception_frame(EFRAME_VERIFY, irq_eframe, 0, bt, ofp))