| From | Luis Henriques <> | Subject | [PATCH 3.16.y-ckt 013/180] PCI/AER: Avoid info leak in __print_tlp_header() | Date | Thu, 7 May 2015 10:43:42 +0100 |
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3.16.7-ckt11 -stable review patch. If anyone has any objections, please let me know.
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From: Rasmus Villemoes <linux@rasmusvillemoes.dk>
commit a1b7f2f6367944d445c6853035830a35c6343939 upstream.
Commit fab4c256a58b ("PCI/AER: Add a TLP header print helper") introduced the helper function __print_tlp_header(), but contrary to the intention, the behaviour did change: Since we're taking the address of the parameter t, the first 4 or 8 bytes printed will be the value of the pointer t itself, and the remaining 12 or 8 bytes will be who-knows-what (something from the stack).
We want to show the values of the four members of the struct aer_header_log_regs; that can be done without ugly and error-prone casts. On little-endian this should produce the same output as originally intended, and since no-one has complained about getting garbage output so far, I think big-endian should be ok too.
Fixes: fab4c256a58b ("PCI/AER: Add a TLP header print helper") Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Borislav Petkov <bp@suse.de> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/pci/pcie/aer/aerdrv_errprint.c | 12 ++---------- 1 file changed, 2 insertions(+), 10 deletions(-)
diff --git a/drivers/pci/pcie/aer/aerdrv_errprint.c b/drivers/pci/pcie/aer/aerdrv_errprint.c index 36ed31b52198..3f893dd8fa89 100644 --- a/drivers/pci/pcie/aer/aerdrv_errprint.c +++ b/drivers/pci/pcie/aer/aerdrv_errprint.c @@ -127,16 +127,8 @@ static const char *aer_agent_string[] = { static void __print_tlp_header(struct pci_dev *dev, struct aer_header_log_regs *t) { - unsigned char *tlp = (unsigned char *)&t; - - dev_err(&dev->dev, " TLP Header:" - " %02x%02x%02x%02x %02x%02x%02x%02x" - " %02x%02x%02x%02x %02x%02x%02x%02x\n", - *(tlp + 3), *(tlp + 2), *(tlp + 1), *tlp, - *(tlp + 7), *(tlp + 6), *(tlp + 5), *(tlp + 4), - *(tlp + 11), *(tlp + 10), *(tlp + 9), - *(tlp + 8), *(tlp + 15), *(tlp + 14), - *(tlp + 13), *(tlp + 12)); + dev_err(&dev->dev, " TLP Header: %08x %08x %08x %08x\n", + t->dw0, t->dw1, t->dw2, t->dw3); } static void __aer_print_error(struct pci_dev *dev,
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