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59 lines
2.2 KiB
59 lines
2.2 KiB
From 210ec6353d3cab2029e1eb160671fea918c97814 Mon Sep 17 00:00:00 2001 |
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From: "Jason S. McMullan" <jason.mcmullan@gmail.com> |
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Date: Fri, 22 May 2015 20:30:01 +0200 |
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Subject: [PATCH] udev/net_id: Only read the first 64 bytes of PCI config space |
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The original code used fread(), which on some libc implementions |
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(ie glibc 2.17) would pre-read a full 4K (PAGE_SIZE) of the |
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PCI config space, when only 64 bytes were requested. |
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I have recently come across PCIe hardware which responds with |
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Completion Timeouts when accesses above 256 bytes are attempted. |
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This can cause server systems with GHES/AEPI support to cause |
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and immediate kernel panic due to the failed PCI transaction. |
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This change replaces the buffered fread() with an explict |
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unbuffered read() of 64 bytes, which corrects this issue by |
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only reading the guaranteed first 64 bytes of PCIe config space. |
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(cherry picked from commit 0454229c100a2113ba82df55703436d6cb2c492b) |
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Cherry-picked from: 0454229 |
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Resolves: #1222517 |
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--- |
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src/udev/udev-builtin-net_id.c | 9 +++++---- |
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1 file changed, 5 insertions(+), 4 deletions(-) |
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diff --git a/src/udev/udev-builtin-net_id.c b/src/udev/udev-builtin-net_id.c |
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index 66474f7728..dd2886caf2 100644 |
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--- a/src/udev/udev-builtin-net_id.c |
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+++ b/src/udev/udev-builtin-net_id.c |
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@@ -91,6 +91,7 @@ |
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#include <stdlib.h> |
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#include <stdarg.h> |
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#include <unistd.h> |
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+#include <fcntl.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <net/if.h> |
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@@ -166,15 +167,15 @@ static int dev_pci_onboard(struct udev_device *dev, struct netnames *names) { |
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/* read the 256 bytes PCI configuration space to check the multi-function bit */ |
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static bool is_pci_multifunction(struct udev_device *dev) { |
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- _cleanup_fclose_ FILE *f = NULL; |
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+ _cleanup_close_ int fd = -1; |
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const char *filename; |
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uint8_t config[64]; |
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filename = strjoina(udev_device_get_syspath(dev), "/config"); |
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- f = fopen(filename, "re"); |
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- if (!f) |
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+ fd = open(filename, O_RDONLY | O_CLOEXEC); |
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+ if (fd < 0) |
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return false; |
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- if (fread(&config, sizeof(config), 1, f) != 1) |
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+ if (read(fd, &config, sizeof(config)) != sizeof(config)) |
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return false; |
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/* bit 0-6 header type, bit 7 multi/single function device */
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