diff options
Diffstat (limited to 'source/ap/dmidecode/patches/0002-Avoid-SIGBUS-on-mmap-failure.patch')
| -rw-r--r-- | source/ap/dmidecode/patches/0002-Avoid-SIGBUS-on-mmap-failure.patch | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/source/ap/dmidecode/patches/0002-Avoid-SIGBUS-on-mmap-failure.patch b/source/ap/dmidecode/patches/0002-Avoid-SIGBUS-on-mmap-failure.patch new file mode 100644 index 000000000..924a2ffef --- /dev/null +++ b/source/ap/dmidecode/patches/0002-Avoid-SIGBUS-on-mmap-failure.patch @@ -0,0 +1,74 @@ +From c081fa410e7c466df4b3b257e7b974b71fb7f250 Mon Sep 17 00:00:00 2001 +From: Jean Delvare <jdelvare@suse.de> +Date: Wed, 14 Oct 2015 14:37:04 +0200 +Subject: [PATCH 2/9] Avoid SIGBUS on mmap failure + +mmap will fail with SIGBUS if trying to map a non-existent portion of +a file. While this should never happen with /dev/mem, it can happen if +passing a regular file with option -d. While people should no longer +do that, failure gracefully seems better than crashing. So check for +the file size before calling mmap. + +This closes bug #46066: +http://savannah.nongnu.org/bugs/?46066 +--- + CHANGELOG | 6 ++++++ + util.c | 21 +++++++++++++++++++++ + 2 files changed, 27 insertions(+) + +diff --git a/CHANGELOG b/CHANGELOG +index 42d815c..aa1c28f 100644 +--- a/CHANGELOG ++++ b/CHANGELOG +@@ -1,3 +1,9 @@ ++2015-10-14 Jean Delvare <jdelvare@suse.de> ++ ++ * util.c: Avoid SIGBUS on mmap failure. ++ This fixes Savannah bug #46066: ++ https://savannah.nongnu.org/bugs/?46066 ++ + 2015-10-01 Roy Franz <roy.franz@linaro.org> + + * dmiopt.c: Add "--no-sysfs" option description to -h output. +diff --git a/util.c b/util.c +index 8cafe5c..5795d02 100644 +--- a/util.c ++++ b/util.c +@@ -152,6 +152,7 @@ void *mem_chunk(off_t base, size_t len, const char *devmem) + void *p; + int fd; + #ifdef USE_MMAP ++ struct stat statbuf; + off_t mmoffset; + void *mmp; + #endif +@@ -169,6 +170,26 @@ void *mem_chunk(off_t base, size_t len, const char *devmem) + } + + #ifdef USE_MMAP ++ if (fstat(fd, &statbuf) == -1) ++ { ++ fprintf(stderr, "%s: ", devmem); ++ perror("stat"); ++ free(p); ++ return NULL; ++ } ++ ++ /* ++ * mmap() will fail with SIGBUS if trying to map beyond the end of ++ * the file. ++ */ ++ if (S_ISREG(statbuf.st_mode) && base + (off_t)len > statbuf.st_size) ++ { ++ fprintf(stderr, "mmap: Can't map beyond end of file %s\n", ++ devmem); ++ free(p); ++ return NULL; ++ } ++ + #ifdef _SC_PAGESIZE + mmoffset = base % sysconf(_SC_PAGESIZE); + #else +-- +2.6.4 + |