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util/nvmutil: add bound checks for gbe read/write

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-06 16:18:08 +00:00
parent 94f5e70366
commit a82c766b8c
1 changed files with 26 additions and 3 deletions
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util/nvmutil/nvmutil.c
+26 -3
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@@ -46,6 +46,7 @@ static void set_word(size_t, int, uint16_t);
static void check_bound(size_t, int);
static void write_gbe(void);
static void write_gbe_part(int);
static off_t gbe_bound(int, const char *);
static void usage(void);
static void err(int, const char *, ...);
static const char *getnvmprogname(void);
@@ -86,6 +87,7 @@ static int flags;
static int rfd = -1;
#endif
static int fd = -1;
static struct stat st;
static int part;
static int invert;
static int part_modified[2];
@@ -273,7 +275,6 @@ set_io_flags(int argc, char *argv[])
static void
open_files(void)
{
struct stat st;
#ifndef HAVE_ARC4RANDOM
struct stat st_rfd;
rname = newrandom;
@@ -335,7 +336,7 @@ static void
read_gbe_part(int p, int invert)
{
read_file_PERFECTLY_or_die(fd, buf + (SIZE_4KB * (p ^ invert)),
SIZE_4KB, ((off_t)p) * partsize, fname, "pread");
SIZE_4KB, gbe_bound(p, "pread"), fname, "pread");
}
static void
@@ -723,12 +724,34 @@ static void
write_gbe_part(int p)
{
if (pwrite(fd, buf + (SIZE_4KB * p),
SIZE_4KB, (off_t)p * partsize) != (ssize_t)SIZE_4KB) {
SIZE_4KB, gbe_bound(p, "pwrite")) != (ssize_t)SIZE_4KB) {
err(ECANCELED,
"Can't write %d b to '%s' p%d", SIZE_4KB, fname, p);
}
}
/*
* Reads to GbE from write_gbe_part and read_gbe_part
* are filtered through here. These operations must
* only write from the 0th position or the half position
* within the GbE file, and write 4KB of data.
*
* This check is called, to ensure just that.
*/
static off_t
gbe_bound(int p, const char *f_op)
{
off_t off = (off_t)p * partsize;
if (off + SIZE_4KB > st.st_size)
err(ECANCELED, "GbE file %s out of bounds: %s", f_op, fname);
if (off != 0 && off != st.st_size >> 1)
err(ECANCELED, "GbE file %s at bad offset: %s", f_op, fname);
return off;
}
static void
usage(void)
{