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4ed28a7a
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2025-03-07T09:41:18
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libpkgconf: parser: reset read buffer when bailing early to read a new line
Otherwise the old line would not be removed from the buffer.
Related: https://github.com/pkgconf/pkgconf/issues/384
Signed-off-by: Ariadne Conill <ariadne@ariadne.space>
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c0d188fb
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2025-03-07T09:23:55
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libpkgconf: parser: gracefully handle pkgconf_fgetline failures
With the move to dynamic buffering of pkg-config files, it is possible for
pkgconf_fgetline to leave the buffer in an unwritten state, where a buffer
will not be allocated.
We must gracefully handle this situation, so we bail early and re-enter the
loop to try reading the buffer again. If it fails again, then we finish
parsing the already read pkg-config data.
Related: https://github.com/pkgconf/pkgconf/issues/384
Signed-off-by: Ariadne Conill <ariadne@ariadne.space>
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e8dc0e20
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2025-02-04T16:57:14
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libpkgconf: parser: finalize the parsing buffer when done with it
Signed-off-by: Ariadne Conill <ariadne@ariadne.space>
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a4de2930
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2025-02-03T05:31:40
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libpkgconf: fileio: use bool for fgetline return type instead of a pointer
(we internally look at the raw buffer anyway)
Signed-off-by: Ariadne Conill <ariadne@ariadne.space>
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d0f8f3f2
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2025-02-02T01:33:06
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libpkgconf: fileio: rework to use pkgconf_buffer, allowing larger than 64KB lines
Fixes: 130907d ("fileio: add routine for portably yanking lines out of a FILE stream")
Signed-off-by: Ariadne Conill <ariadne@ariadne.space>
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212c8586
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2023-03-17T19:32:58
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Avoid undefined behaviour with the ctype(3) functions.
fix https://github.com/pkgconf/pkgconf/issues/291
As defined in the C standard:
In all cases the argument is an int, the value of which shall
be representable as an unsigned char or shall equal the value
of the macro EOF. If the argument has any other value, the
behavior is undefined.
This is because they're designed to work with the int values returned
by getc or fgetc; they need extra work to handle a char value.
If EOF is -1 (as it almost always is), with 8-bit bytes, the allowed
inputs to the ctype(3) functions are:
{-1, 0, 1, 2, 3, ..., 255}.
However, on platforms where char is signed, such as x86 with the
usual ABI, code like
char *ptr = ...;
... isspace(*ptr) ...
may pass in values in the range:
{-128, -127, -126, ..., -2, -1, 0, 1, ..., 127}.
This has two problems:
1. Inputs in the set {-128, -127, -126, ..., -2} are forbidden.
2. The non-EOF byte 0xff is conflated with the value EOF = -1, so
even though the input is not forbidden, it may give the wrong
answer.
Casting char to unsigned int first before passing the result to
ctype(3) doesn't help: inputs like -128 are unchanged by this cast,
because (on a two's-complement machine with 32-bit int and unsigned
int), converting the signed char with integer value -128 to unsigned
int gives integer value 2^32 - 128 = 0xffffff80, which is out of
range, and which is converted in int back to -128, which is also out
of range.
It is necessary to cast char inputs to unsigned char first; you can
then cast to unsigned int if you like but there's no need because the
functions will always convert the argument to int by definition. So
the above fragment needs to be:
char *ptr = ...;
... isspace((unsigned char)*ptr) ...
This patch changes unsigned int casts to unsigned char casts, and
adds unsigned char casts where they are missing.
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506ebab7
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2022-09-30T15:33:47
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Ignore whitespace indentation
Fixes #265
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92745ad9
|
2020-05-24T21:51:14
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libpkgconf: parser: fix out of boundary access
It is possible to trigger an out of boundary access with specially
crafted files. If a line consist of only a key and spaces, then
op will point to '\0'-ending of the buffer. Since p is iterated by
one byte right past this ending '\0', the next read access to p is
effectively out of bounds.
Theoretically this can also lead to out of boundary writes if spaces
are encountered.
Proof of concept (I recommend to compile with address sanitizer):
$ echo -n a > poc.pc
$ dd if=/dev/zero bs=1 count=65533 | tr '\0' ' ' >> poc.pc
$ pkgconf poc.pc
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db9c1e96
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2019-06-07T19:19:28
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fix the order of header includes
config.h should be included before stdinc.h, otherwise large file
support is not enabled.
Downstream bug: https://bugs.gentoo.org/687548
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1244f8f8
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2018-05-09T21:21:39
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libpkgconf: refactor out the rfc822 message parser so that the cross-personality code can share it
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